Baocaodoan_2008 - Lap Trinh Mang.doc

Li cm n

Em xin chn thnh cm n n thy Trn Phc Tun tn tnh hng dn

em trong thi gian thc hin n ny.

Em xin chn thnh cm n Khoa Ton Tin hc to iu kin cho em

thc hin tt n ny.

Xin chn thnh cm n cc bn tn tnh gip mnh c th thc hin

tt n ny.

TpHCM, ngy 7 thng 5 nm 2009

Sinh vin

Nguyn Ngc Duy Tu

MC LC

Li cm n ..............................................................................................................1

MC LC...............................................................................................................2

DANH SCH CC HNH V................................................................................5

DANH SCH CC BNG BIU...........................................................................6

Chng 1: M u .............................................................................................7

1.1 L do chn ti:.......................................................................................7

1.2 Mc ch ca ti: ...................................................................................7

1.3 i tng v phm vi nghin cu...............................................................7

1.3.1 i tng nghin cu ..........................................................................7

1.3.2 Phm vi nghin cu .............................................................................7

Chng 2: KIN THC NG DNG ..............................................................8

2.1 S lc v lp trnh Socket:........................................................................8

2.1.1 Khi nim a ch v cng (Address & Port) .......................................8

2.1.2 Lp IPAddress .....................................................................................8

2.1.3 Lp IPEndpoint .................................................................................11

2.1.4 Lp UDP ...........................................................................................12

2.1.5 Lp TCP (TCPClient) ........................................................................14

2.1.6 Lp TcpListener ................................................................................16

2.2 S lc v lp trnh a lung:...................................................................17

2.2.1 Khi nim Lung (Thread).................................................................17

2.2.2 Kho st namespace System.Threading..............................................18

2.2.2.1 Lp Thread..................................................................................19

2.2.2.2 Thao tc vi lung.......................................................................21

2.2.3 ng b ha (Synchronization) trong lp trnh a lung: ...................23

2.2.3.1 ng b ha................................................................................23

2.2.3.2 Deadlock .....................................................................................29

2.2.3.3 Race condition.............................................................................31

Chng 3: PHN TCH THIT K CHNG TRNH..................................34

3.1 Phn tch ..................................................................................................34

3.1.1 Phn tch nhu cu thc tin: ...............................................................34

3.1.2 Yu cu ra: ....................................................................................34

3.1.3 M hnh d liu mc quan nim: ....................................................35

3.1.4 Phn tch cc thnh phn x l:..........................................................36

3.1.4.1 M hnh lung x l ng nhp...................................................36

3.1.4.2 M hnh lung x l gi tin nhn ................................................38

3.1.4.3 M hnh lung x l FriendList...................................................40

3.1.4.4 M hnh lung x l Group Chat.................................................42

3.2 Thit k cc lp x l ...............................................................................47

3.2.1 Lp DataLayer:..................................................................................47

3.2.2 Lp MyDatabase: ..............................................................................48

3.2.3 Lp ImageListBoxItem......................................................................49

3.2.4 Lp ImageListBox: ............................................................................50

3.2.5 Lp Settings:......................................................................................51

3.2.6 Lp MultilineListBoxItem: ................................................................52

3.2.7 Lp MultilineListBox: .......................................................................52

3.2.8 Lp TabControlEx: ............................................................................53

3.2.9 LpMyDataPack:...............................................................................54

3.2.10 Lp ClientHandler:.........................................................................55

3.3 Mt s qui tc v hm x l c bn ..........................................................56

3.3.1 Qui tc gi d liu trong mng:..........................................................56

3.3.2 Mt s hm x l c bn:...................................................................57

3.3.2.1 Hm PackData.............................................................................57

3.3.2.2 Hm UnPackData........................................................................58

3.3.2.3 Hm SaveSettings v LoadSettings .............................................60

3.3.2.4 Hm theadListen .........................................................................61

3.4 Thit k d liu ........................................................................................62

3.4.1 Chun ha d liu: .............................................................................62

3.4.2 M hnh d liu mc vt l:............................................................62

3.4.3 Thit k d liu:.................................................................................62

3.4.4 M t cc rng buc ton vn:............................................................65

3.5 Thit k giao din.....................................................................................65

3.5.1 Mn hnh ng nhp ..........................................................................65

3.5.2 Mn hnh chnh..................................................................................66

3.5.3 Mn hnh thm Friend........................................................................66

3.5.4 Mn hnh xa Friend..........................................................................67

3.5.5 Mn hnh Chat With ..........................................................................67

3.5.6 Mn hnh Invite Group.......................................................................68

3.5.7 Mn hnh Invite Another....................................................................68

3.5.8 Mn hnh Settings ..............................................................................69

Chng 4: CI T TH NGHIM ...........................................................70

4.1 Ci t chng trnh .................................................................................70

4.1.1 Ci t Server ....................................................................................70

4.1.2 Ci t Client .....................................................................................73

4.2 Hng dn s dng ..................................................................................75

Chng 5: KT LUN....................................................................................76

5.1 Kt qu t c ......................................................................................76

5.2 Hng pht trin ......................................................................................76

TI LIU THAM KHO .....................................................................................77

DANH SCH CC HNH V

Hnh 2-1: Kt qu chng trnh khng s dng ng b ha .................................27 Hnh 2-2: Kt qu chng trnh s dng ng b ha............................................29 Hnh 3-1: M hnh d liu mc quan nim .........................................................35 Hnh 3-2: M hnh x l ng nhp.......................................................................36 Hnh 3-3: M hnh x l ng xut........................................................................37 Hnh 3-4: M hnh x l gi tin nhn Online.........................................................38 Hnh 3-5: M hnh x l gi tin nhn Offline ........................................................39 Hnh 3-6: M hnh x l thm Friend ....................................................................40 Hnh 3-7: M hnh x l xa Friend ......................................................................41 Hnh 3-8: M hnh x l to Group .......................................................................42 Hnh 3-9: M hnh x l ng gia nhp Group ...................................................43 Hnh 3-10: M hnh x l thot khi Group...........................................................44 Hnh 3-11: M hnh x l hy Group ....................................................................45 Hnh 3-12: M hnh x l gi tin nhn trong Group ..............................................46 Hnh 3-13: M hnh lp DataLayer........................................................................47 Hnh 3-14: M hnh lp MyDatabase ....................................................................48 Hnh 3-15: M hnh lp ImageListBoxItem...........................................................49 Hnh 3-16: M hnh lp ImageListBox..................................................................50 Hnh 3-17: M hnh lp Settings............................................................................51 Hnh 3-18: M hnh lp MultilineListBoxItem ......................................................52 Hnh 3-19: M hnh lp TabControlEx..................................................................53 Hnh 3-20: M hnh lp MyDataPack....................................................................54 Hnh 3-21: M hnh ClientHandler ........................................................................55 Hnh 3-22: M hnh d liu mc vt l...............................................................62 Hnh 3-23: Mn hnh ng nhp ............................................................................65 Hnh 3-24: Mn hnh chnh....................................................................................66 Hnh 3-25: Mn hnh thm Friend..........................................................................66 Hnh 3-26: Mn hnh xa Friend............................................................................67 Hnh 3-27: Mn hnh Chat With ............................................................................67 Hnh 3-28: Mn hnh Invite Group .......................................................................68 Hnh 3-29: Mn hnh Invite Another......................................................................68 Hnh 3-30: Mn hnh Invite Another......................................................................69 Hnh 4-1: Ci t Microsoft SQL Destop Engine...................................................70 Hnh 4-2: Ci t Server Mn hnh Customer Information..................................71 Hnh 4-3: Ci t Server Mn hnh Destination Folder .......................................72 Hnh 4-4: Ci t Server Mn hnh SQL Login...................................................73 Hnh 4-5: Ci t Server Mn hnh Finish...........................................................73 Hnh 4-6: Ci t Client Mn hnh Customer Information ..................................74 Hnh 4-7: Ci t Client Mn hnh Destination Folder ........................................74 Hnh 4-8: Ci t Client Mn hnh Finish ...........................................................75

DANH SCH CC BNG BIU

Bng 2-1: Cc thnh phn ca lp IpAddress 9

Bng 2-2: Cc thnh vin ca lp IpEndPoint 11

Bng 2-3: Cc thnh vin ca lp UDPClient 13

Bng 2-4: Cc thnh phn ca lp TcpClient 15

Bng 2-5: Cc thnh phn ca lp TcpListener 16

Bng 2-6: Mt s lp ca namespace System.Threading 19

Bng 2-7: Cc thnh phn static ca lp Thread 20

Bng 2-8: Cc thnh vin cp i tng ca lp Thread 20

Bng 3-1: M ngun hm PackData 57

Bng 3-2: M ngun hm UnPackData 58

Bng 3-3: M ngun hm SaveSettings v LoadSettings 60

Bng 3-4: M ngun hm theadListen 61

Bng 3-5: Table Users 63

Bng 3-6: Table FriendList 63

Bng 3-7: Table OfflineMessage 64

Bng 3-8: Table GroupChat 64

Bng 3-9: Table GroupDetail 64

Chng 1: M u

1.1 L do chn ti:

Hin nay, mng Lan c nhng tin b vt bc v ngy cng ph bin

hn trong i sng sinh hoat. iu ny lm cho nhu cu lin lc v trao i thng

tin thng qua mng Lan ngy cng ln hn. Chnh v vy, chng trnh Chat trn

mng Lan c xy dng p ng phn no nhng nhu cu cp thit .

1.2 Mc ch ca ti:

Xy dng chng trnh Chat hot ng trong mng Lan vi cc chc nng

c bn nh: gi tin nhn, to mt nhm Chat v lu thng tin bn b.

1.3 i tng v phm vi nghin cu

1.3.1 i tng nghin cu

Tm hiu c c ch hot ng ca Socket v Thread trong .NET

Framwork t vit ng dng Chat trong mng Lan.

1.3.2 Phm vi nghin cu

Chng trnh Chat c xy dng vi kh nng Chat bng vn bn

gia cc User, thnh lp cc nhm Chat thng qua s iu khin ca mt

Server trong mng Lan.

Chng 2: KIN THC NG DNG

2.1 S lc v lp trnh Socket:

2.1.1 Khi nim a ch v cng (Address & Port)

Nguyn l:

Trong mt my c rt nhiu ng dng mun trao i vi cc ng dng

khc thng qua mng (v d trn c 2 ng dng trong my A mun trao

i vi vi 2 ng dng trn my B).

Mi my tnh ch c duy nht mt ng truyn d liu ( gi v nhn).

Vn : Rt c th xy ra "nhm ln" khi d liu t my A gi n my

B th khng bit l d liu gi cho ng dng no trn my B?

Gii quyt: Mi ng dng trn my B s c gn mt s hiu (m ta

vn quen gi l cng Port), s hiu cng ny t 1..65535. Khi ng dng trn

my A mun gi cho ng dng no trn my B th ch vic in thm s hiu

cng (vo trng RemotePort) vo gi tin cn gi. Trn my B, cc ng

dng s vic kim tra gi tr cng trn mi gi tin xem c trng vi s hiu

cng ca mnh ( c gn chnh l gi tr Localport) hay khng? Nu

bng th x l, cn tri li th khng lm g.

Nh vy: Khi cn trao i d liu cho nhau th hai ng dng cn phi bit

thng tin ti thiu l a ch (Address) v s hiu cng (Port) ca ng dng

kia.

2.1.2 Lp IPAddress

Trn Internet mi mt trm (c th l my tnh, my in, thit b ) u c

mt nh danh duy nht, nh danh thng c gi l mt a ch (Address).

a ch trn Internet l mt tp hp gm 4 con s c gi tr t 0-255 v cch nhau

bi du chm.

th hin a ch ny, ngi ta c th vit di cc dng sau:

Tn : V d May01, Server, .

a ch IP nhng t trong mt xu: "192.168.1.1", "127.0.0.1"

t trong mt mng 4 byte, mi byte cha mt s t 0-255. V d biu

din a ch 192.168.1.1 vi khai bo byte[] DiaChi = new byte[4];, ta c

th vit:

DiaChi(0) = 192;

DiaChi(1) = 168;

DiaChi(2) = 1;

DiaChi(3) = 1;

Hoc cng c th l mt s (long), c di 4 byte. V d, vi a ch

192.168.1.1 trn th gi tr s l: 16885952 (y l s h thp phn khi

xp lin 4 byte trn li vi nhau 00000001 00000001 10101000 11000000

Nh vy, i mt a ch chun ra dng s ta ch vic tnh ton cho

tng thnh phn. V d: i a ch 192.168.1.2 ra s, ta tnh nh sau :

2 * 256 ^ 3 + 1* 256 ^ 2 + 168 * 256 ^ 1 + 192 * 256 ^ 0

Trong .NET, IPAddress l mt lp dng m t a ch ny. y l lp rt

c bn c s dng khi chng ta thao tc (truyn) vo cc lp nh IPEndpoint,

UDP, TCP, Socket

Bng 2-1: Cc thnh phn ca lp IpAddress

Thnh vin Static M t

Any Cung cp mt a ch IP (thng l 0.0.0.0) ch ra

rng Server phi lng nghe cc hot ng ca Client

trn tt c cc Card mng (s dng khi xy dng

Server). Thuc tnh ny ch c.

Broadcast Cung cp mt a ch IP qung b (Broadcast, thng

l 255.255.255.255), dng s long.

Loopback Tr v mt a ch IP lp (IP Loopback, v d

127.0.0.1).

AddressFamily Tr v h a ch ca a ch IP hin hnh. Nu a ch

1 (Byte 0) 1 168 192 (Byte 3)

dng IPv4 th kt qu l Internetwork, v

InternetworkV6 nu l a ch IPv6.

Phng thc M t

IPAddress(Int64) To a ch IP t mt s long.

IPAddress(Byte[]) To a ch IP t mt mng Byte.

GetAddressByte () Chuyn a ch thnh mng Byte.

HostToNetworkOrder() o th t Byte ca mt s cho ng vi th t Byte

trong a ch IPAddress.

IsLoopback() Cho bit a ch c phi l a ch lp hay khng?

V d 1: Kim tra xem 192.168.1.300 c phi l a ch IP hp l khng

private void KiemTra()

{

String Ip1 = "127.0.0.1";

String Ip2 = "999.0.0.1";

MessageBox.Show(IPAddress.TryParse(Ip1, new IPAddress(0)));

MessageBox.Show (IPAddress.TryParse(Ip2, new IPAddress(1)));

}

V d 2: Chuyn a ch hin hnh ra mng byte v hin th tng thnh

sphn trong mng

private void KiemTra()

{

IpAddress Ip3 = new IPAddress(16885952);

Byte[] b;

b = Ip3.GetAddressBytes();

MessageBox.Show("Address: " & b(0) &"." & b(1) &"." & b(2) & "." &

b(3));

}

2.1.3 Lp IPEndpoint

Trong mng, hai trm c th trao i thng tin c vi nhau th chng

cn phi bit c a ch (IP) ca nhau v s hiu cng m hai bn dng trao

i thng tin. Lp IPAddress mi ch cung cp cho ta mt v l a ch IP

(IPAddress), nh vy vn cn thiu v th hai l s hiu cng (Port number). Nh

vy, lp IPEndpoint chnh l lp cha ng c IPAddress v Port number.

i tng IPEndpoint s c dng sau ny truyn trc tip cho cc i

tng UDP, TCP

Bng 2-2: Cc thnh vin ca lp IpEndPoint

Phng thc khi to M t

IPEndPoint(Int64, Int32) To mt i tng mi ca lp IPEndPoint,

tham s truyn vo l a ch IP ( dng s) v

cng s dng giao tip.

IPEndPoint(IPAddress,

Int32)

To mt i tng mi ca lp IPEndPoint,

Tham s truyn vo l mt a ch IPAddress v

s hiu cng dng giao tip.

Thuc tnh M t

Address Tr v hoc thit lp a ch IP cho Endpoint (tr

v mt i tng IPAddress).

AddressFamily Ly v loi giao thc m Endpoint ny ang s

dng.

Port Ly hoc gn s hiu cng ca Endpoint.

Phng thc M t

Create() To mt Endpoint t mt a ch socket (socket

address).

ToString() Tr v a ch IP v s hiu cng theo khun

dng a ch: cng. V d: 192.168.1.1:8080

2.1.4 Lp UDP

Giao thc UDP (User Datagram Protocol hay User Define Protocol) l mt

giao thc phi kt ni (connectionless) c ngha l mt bn c th gi d liu cho

bn kia m khng cn bit l bn sn sng hay cha? (Ni cch khc l khng

cn thit lp kt ni gia hai bn khi tin hnh trao i thng tin). Giao thc ny

khng tin cy bng giao thc TCP nhng tc li nhanh v d ci t. Ngoi ra,

vi giao thc UDP ta cn c th gi cc gi tin qung b (Broadcast) cho ng thi

nhiu my.

Trong .NET, lp UDPClient (nm trong namesapce System.Net.Sockets)

ng gi cc chc nng ca giao thc UDP.

Bng 2-3: Cc thnh vin ca lp UDPClient

Phng thc khi to M t

UdpClient () To mt i tng (th hin) mi ca lp

UDPClient.

UdpClient (AddressFamily) To mt i tng (th hin) mi ca lp

UDPClient. Thuc mt dng a ch

(AddressFamily) c ch nh.

UdpClient (Int32) To mt UdpClient v gn (bind) mt cng cho

n.

UdpClient (IPEndPoint) To mt UdpClient v gn (bind) mt IPEndpoint

(gn a ch IP v cng) cho n.

UdpClient(Int32,

AddressFamily)

To mt UdpClient v gn s hiu cng,

AddressFamily

UdpClient(String, Int32) To mt UdpClient v thit lp vi mt trm t xa

mc nh.

Phng thc M t

BeginReceive() Nhn d liu Khng ng b t my xa.

BeginSend() Gi khng ng b d liu ti my xa

Close() ng kt ni.

Connect() Thit lp mt Default remote host.

EndReceive() Kt thc nhn d liu khng ng b trn

EndSend() Kt thc vic gi d liu khng ng b trn

Receive (ref IPEndPoint)

Nhn d liu (ng b) do my xa gi. (ng b

c ngha l cc lnh ngay sau lnh Receive ch

c thc thi nu Receive nhn c d liu v

. Cn nu n cha nhn c d ch mt cht

th n vn c ch (blocking))

Send() Gi d liu (ng b) cho my xa.

2.1.5 Lp TCP (TCPClient)

Mc ch ca lp UDPClient trn l dng cho lp trnh vi giao thc UDP,

vi giao thc ny th hai bn khng cn phi thit lp kt ni trc khi gi do vy

mc tin cy khng cao. m bo tin cy trong cc ng dng mng, ngi

ta cn dng mt giao thc khc, gi l giao thc c kt ni : TCP (Transport

Control Protocol). Trn Internet ch yu l dng loi giao thc ny, v d nh

Telnet, HTTP, SMTP, POP3 lp trnh theo giao thc TCP, MS.NET cung cp

hai lp c tn l TCPClient v TCPListener.

Bng 2-4: Cc thnh phn ca lp TcpClient

Phng thc khi to M t

TcpClient() To mt i tng TcpClient. Cha t thng s g.

TcpClient(IPEndPoint) To mt TcpClient v gn cho n mt EndPoint cc

b. (Gn a ch my cc b v s hiu cng s dng

trao i thng tin v sau)

TcpClient(String,Int32) To mt i tng TcpClient v kt ni n mt my

c a ch v s hiu cng c truyn vo.

RemoteHost c th l a ch IP chun hoc tn my.

Cc thuc tnh M t

Available Cho bit s byte nhn v t mng v c sn c.

Client Tr v Socket ng vi TCPClient hin hnh.

Connected Trng thi cho bit kt ni c n Server hay

cha?

Cc hm thnh phn M t

Close() Gii phng i tng TcpClient nhng khng ng kt

ni.

Connect(RemoteHost,

RemotePort)

Kt ni n mt my TCP khc c Tn v s hiu cng.

GetStream() Tr v NetworkStream t gip ta gi hay nhn

d liu. (Thng lm tham s khi to StreamReader

v StreamWriter gi v nhn d liu di dng xu

k t) .

Khi gn vo StreamReader v StreamWriter ri

th ta c th gi v nhn d liu thng qua cc phng

thc Readline, writeline tng ng ca cc lp ny.

T cc thnh vin ca lp TcpClient trn ta thy rng, vic kt ni v thc

hin gi nhn rt n gin. Theo cc trnh t sau:

Bc 1: To mt i tng TcpClient.

Bc 2: Kt ni n my ch (Server) dng phng thc Connect.

Bc 3: To 2 i tng StreamReader (Receive)v StreamWriter (Send)

v "ni" vi GetStream ca cpPClient.

Bc 4:

Dng i tng StreamWriter.Writeline/Write va to trn gi

d liu i.

Dng i tng StreamReader.Readline/Read va to trn c

d liu v.

Bc 5: ng kt ni.

Nu mun gi/nhn d liu mc byte (nh phn) th dng NetworkStream.

(truyn GetStream cho NetworkStream).

2.1.6 Lp TcpListener

TCPListerner l mt lp cho php ngi lp trnh c th xy dng cc ng dng

Server (V d nh SMTP Server, FTP Server, DNS Server, POP3 Server hay server

t nh ngha .). ng dng server khc vi ng dng Client ch n lun lun

thc hin lng nghe v chp nhn cc kt ni n t Client.

Bng 2-5: Cc thnh phn ca lp TcpListener

Phng thc khi to M t

TcpListener ( Int32) To mt TcpListener v lng nghe ti cng ch

nh.

TcpListener (IPEndPoint) To mt TcpListener vi gi tr Endpoint truyn

vo.

TcpListener(IPAddress,Int32) To mt TcpListener v lng nghe cc kt ni

n ti a ch IP v cng ch nh.

Phng thc M t

AcceptSocket( ) Chp nhn mt yu cu kt ni ang ch.

AcceptTcpClient() Chp nhn mt yu cu kt ni ang ch. (ng

dng s dng ti lnh ny cho n khi no c

mt kt ni n Blocking).

Pending() Cho bit liu c kt ni no ang ch i khng

Start() Bt u lng nghe cc yu cu kt ni.

Stop() Dng vic nghe.

2.2 S lc v lp trnh a lung:

2.2.1 Khi nim Lung (Thread)

Mt lung (Thread) l mt chui lin tip nhng s thc thi trong chng

trnh. Trong mt chng trnh C#, vic thc thi bt u bng phng thc main() v

tip tc cho n khi kt thc hm main(). Cu trc ny rt hay cho nhng chng

trnh c mt chui xc nh nhng nhim v lin tip. Nhng thng th mt

chng trnh cn lm nhiu cng vic hn vo cng mt lc. V d trong Internet

Explorer khi ta ang ti mt trang web th ta nhn nt back hay mt link no ,

lm vic ny Internet Explorer s phi lm t nht l 3 vic:

Ly d liu c tr v t Internet cng vi cc tp tin i km.

Th hin trang Web.

Xem ngi dng c nhp lm th g khc khng.

n gin vn ny ta gi s Internet Explorer ch lm hai cng vic:

Trnh by trang Web.

Xem ngi dng c nhp g khng.

thc hnh vic ny ta s vit mt phng thc dng ly v th hin

trang Web. Gi s rng vic trnh by trang Web mt nhiu thi gian (do phi thi

hnh cc on javascript hay cc hiu ng no ). V vy sau mt khong thi

gian ngn khong 1/12 giy, phng thc s kim tra xem ngi dng c nhp g

khng. Nu c th n s uc x l, nu khng th vic trnh by trang s c tip

tc. V sau 1/12 giy vic kim tra s c lp li. Tuy nhin vit phng thc ny

th rt phc tp do ta s dng kin trc event trong Window ngha l khi vic

nhp xy ra h thng s thng bo cho ng dng bng cch a ra mt event. Ta s

cp nht phng thc cho php dng cc event:

Ta s vit mt b x l event p ng i vi vic nhp ca ngi

dng.

Ta s vit mt phng thc ly v trnh by d liu. Phng thc ny

c thc thi khi ta khng lm bt c iu g khc.

Ta hy xem cch phng thc ly v trnh by trang web lm vic: u tin

n s t nh thi gian. Trong khi n ang chy, my tnh khng th p ng vic

nhp ca ngi dng . Do n phi ch n vic nh thi gian gi phng

thc kim tra vic nhp ca ngi dng, ngha l phng thc va chy va quan

st thi gian. Bn cnh n cn phi quan tm n vic lu tr trng thi trc khi

n gi phng thc khc sau khi phng thc khc thc hin xong n s tr v

ng ch n dng. Vo thi Window 3.1 y thc s l nhng g phi lm x

l tnh hung ny. Tuy nhin NT3.1 v sau l Windows 95 tr i c vic x

l a lung iu ny lm vic gii quyt vn tin li hn. Di y chng ta s

tm hiu mt vi lp c bn trong ngn ng lp trnh C# v vn ng b ha

(Synchronization) trong lp trnh a lung.

2.2.2 Kho st namespace System.Threading

Namespace System.Threading cung cp mt s kiu d liu cho php bn

thc hin lp trnh a lung. Ngoi vic cung cp nhng kiu d liu tng trng

cho mt lung c th no , namespace ny cn nh ngha nhng lp c th qun

l mt collection cc lung (ThreadPool), mt lp Timer n gin (khng da vo

GUI) v cc lp cung cp truy cp c ng b vo d liu c chia s s dng.

Bng 2-6: Mt s lp ca namespace System.Threading

Cc lp thnh vin M t

Interlocked Lp ny dng cung cp truy cp ng b ha vo d

liu c chia s s dng (shared data).

Moniter Lp ny cung cp vic ng b ha cc i tng lung

s dng kha cht (lock) v tn hiu ch (wait signal).

Mutex Lp ny cung cp vic ng b ha s ng c th

c dng i vi inter process synchronization.

Thread Lp ny tng trng cho mt lung c thi hnh trong

lng Common Language Runtime. S dng lp ny bn

c kh nng b sung nhng lung khc trong cng

AppDomain.

ThreadPool Lp ny qun l nhng lung c lin h vi nhau trong

cng mt Process no .

Timer Cho bit mt delegate c th c triu gi vo mt lc

c khai bo no . Tc v wait c thi hnh bi

lung trong thread pool.

WaitHandle Lp ny tng trng cho tt c cc i tng ng b

ha (cho php multiple wait) vo lc chy.

ThreadStart Lp ny l mt delegate ch v hm hnh s no

phi c thi hnh u tin khi mt lung bt u.

TimerCallBack Delegate i vi Timer.

WaitCallBack Lp ny l mt delegate nh ngha hm hnh s ku

gi li (callback) i vi ThreadPool user work item.

2.2.2.1 Lp Thread

Lp n gin nht trong tt c cc lp thuc Namespace System.Threading

l lp Thread. Lp ny tng trng cho mt v bc hng i tng bao quanh mt

l trnh thi hnh trong lng mt AppDomain no . Lp ny nh ngha mt s

hm thc thi (c static ln shared) cho php bn to mi nhng lung t lung hin

hnh, cng nh cho Sleep, Stop hay Kill mt lung no .

Bng 2-7: Cc thnh phn static ca lp Thread

Cc thnh phn Static M t

CurrentThread Thuc tnh read-only ny tr v mt quy chiu v

lung hin ang chy.

GetData() i ly v tr t slot c khai bo trn lung hin

hnh i vi domain hin hnh trong lung.

SetData() Cho t tr ln slot c khai bo trn lung hin

hnh i vi domain hin hnh trong lung

GetDomain()

GetDomainID()

i ly mt qui chiu v AppDomain hin hnh

(hoc m nhn din ID ca domain ny) m lung

hin ang chy trn .

Sleep() Cho ngng lung hin hnh trong mt thi gian nht

nh c khai bo.

Ngoi ra lp Thread cng h tr cc thnh vin cp i tng.

Bng 2-8: Cc thnh vin cp i tng ca lp Thread

Cc lp thnh vin M t

IsAlive Thuc tnh ny tr v mt tr boolean cho bit liu xem

lung khi ng hay cha.

IsBackground i ly hoc t gi tr cho bit liu xem lung l mt

lung nn hay khng.

Name Thuc tnh ny cho php bn thit lp mt tn vn bn

mang tnh thn thin i vi lung.

Priority i ly hoc t u tin ca mt lung. C th c

gn mt tr ly t enumeration ThreadPriority (chng

hn Normal, Lowest, Highest, BelowNormal,

AboveNormal).

ThreadState i ly hoc t tnh trng ca lung. C th c

gn t enumeration ThreadState (chng hn

Unstarted, Running, WaitSleepJoin, Suspended,

SuspendRequested, AbortRequested, Stopped).

Interrup() Cho ngng chy lung hin hnh.

Join() Yu cu lung ch i vi lung b ngng chy.

Resume() Tip tc li i vi mt lung b ngng chy.

Start() Cho bt u thi hnh lung c khai bo bi delegate

ThreadStart.

Suspend() Cho ngng chy mt lung. Nu lung b ngng ri,

mt triu gi hm Suspend() s khng c tc dng.

2.2.2.2 Thao tc vi lung

Lung c thao tc bng cch dng lp Thread nm trong Namespace

System.Threading. Mt th hin ca lung i din cho mt lung. Ta c th to

cc lung khc bng cch khi to mt i tng Thread.

Gi s rng ta ang vit 1 trnh bin tp hnh nh ho, v ngi dng yu

cu thay i su ca mu trong nh. Ta bt u khi to mt i tng lung

nh sau:

// entryPoint c khai bo trc l 1 delegate kiu ThreadStart

Thread depthChangeThread = new Thread(entryPoint);

on m trn biu din mt hm khi to ca Thread vi mt thng s ch

nh im nhp ca mt lung. l phng thc ni lung bt u thi hnh.

Trong tnh hung ny ta dng thng s l delegate, mt delegate c nh ngha

trong System.Threading gi l ThreadStart, ch k ca n nh sau:

public delegate void ThreadStart();

Thng s ta truyn cho hm dng phi l 1 delegate kiu ny. Ta bt u

lung bng cch gi phng thc Thread.Start() , gi s rng ta c phng thc

ChangeColorDepth():

void ChangeColorDepth()

{

// x l thay i mu

}

Sp xp li ta c on m sau :

ThreadStart entryPoint = new ThreadStart(ChangeColorDepth);

Thread depthChangeThread = new Thread(entryPoint);

depthChangeThread.Name = Depth Change Thread;

depthChangeThread.Start();

Sau im ny, c hai lung s chy ng b vi nhau.

Trong on m ny ta ng k tn cho lung bng cch dng thuc tnh

Thread.Name. Khng cn thit lm iu ny nhng n c th hu ch.

Lu rng bi v im t nhp vo lung (trong v d ny l

ChangeColorDepth() ) khng th ly bt k thng s no. Ta s phi tm mt cch

no truyn thng s cho phng thc nu cn. Cch tt nht l dng cc

trng thnh vin ca lp m phng thc ny l thnh vin. Cng vy phng

thc khng th tr v bt c th g .

Mi ln ta bt u mt lung khc, ta cng c th nh ch, hi phc hay b

qua n. nh ch ngha l cho lung ng (sleep) - ngha l khng chy trong 1

khong thi gian. Sau n th c phc hi, ngha l tr n v thi dim m n

b nh ch. Nu lung c b, n dng chy. Window s hu tt c d liu m lin

h n lung , lung khng th c bt u li. Tip tc v d trn, ta gi s

v l do no lung giao din ngi dng trnh by mt hp thoi cho ngi dng

c hi nh ch tm thi s i tin trnh. Ta s son m p ng trong lung

main :

depthChangeThread.Suspend();

V nu ngi dng c yu cu cho tin trnh c phc hi:

depthChangeThread.Resume();

Cui cng nu ngi dng mun hu lung :

depthChangeThread.Abort();

Phng thc Suspend() c th khng lm cho lung b nh ch tc thi m

c th l sau mt vi lnh, iu ny l lung c nh ch an ton. i vi

phng thc Abort() n lm vic bng cch tung ra bit l ThreadAbortException.

ThreadAbortException l mt lp bit l c bit m khng bao gi c x l. Nu

lung thc thi m bn trong khi try, bt k khi finally s c thc thi trc

khi lung b hu. Sau khi hu lung ta c th mun i cho n khi lung thc s b

hu trc khi tip tc lung khc ta c th i bng cch dng phng thc join() :

depthChangeThread.Abort();

depthChangeThread.Join();

Join() cng c mt s overload khc ch nh thi gian i. Nu ht thi gian

ny vic thi hnh s c tip tc. Nu mt lung chnh mun thi hnh mt vi

hnh ng trn n, n cn mt tham chiu n i tng lung m i din cho

lung ring. N c th ly mt tham chiu s dng thuc tnh static -

CurrentThread- ca lp Thread:

Thread myOwnThread = Thread.CurrentThread;

C hai cch khc nhau m ta c th thao tc lp Thread:

Ta c th khi to 1 i tng lung , m s i din cho lung ang

chy v cc thnh vin th hin ca n p dng n lung ang chy

Ta c th gi 1 s phng thc static . nhng phng thc ny s p

dng n lung m ta thc s ang gi phng thc t n.

mt phng thc static m ta mun gi l Sleep(), n gin t lung

ang chy ng mt khong thi gian, sau n s tip tc.

2.2.3 ng b ha (Synchronization) trong lp trnh a lung:

2.2.3.1 ng b ha

i khim c th bn mun iu khin vic truy cp vo mt ngun lc,

chng hn cc thuc tnh hoc cc hm ca mt i tng, lm th no ch mt

mch trnh c php thay i hoc s dng ngun lc m thi. Vic ng b

ha c th hin thng qua mt ci kha c thit lp trn i tng, ngn khng

cho lung no truy cp khi mch trnh i trc cha xong cng vic.

Trong phn ny, ta s l quen vi c ch ng b ha m Common

Language Runtime cung cp: lnh lock. Nhng trc tin, ta cn m phng mt

ngun lc c chia s s dng bng cch s dng mt bin s nguyn n gin:

counter.

bt u, ta khai bo bin thnh vin v khi gn v zero:

int counter = 0;

Bi ton c t ra y nh sau: lung th nht s c tr counter (0) ri

gn gi tr ny cho bin trung gian (temp). Tip tng tr ca temp ri Sleep mt

khong thi gian. Lung th nht xong vic th gn tr ca temp tr v cho counter

v cho hin th tr ny. Trong khi n lm cng vic, th lung th hai cng thc hin

mt cng vic ging nh vy. Ta cho vic ny lp ny khong 1000 ln. Kt qu m

ta ch i l hai lung trn m ln lt tng bin counter ln 1 v in ra kt qu 1,

2, 3, 4 tuy nhin ta s xt on chng trnh di y v thy rng kt qu hon

ton khc vi nhng g m chng ta mong i.

on m ca chng trnh nh sau:

using System;

using System.Threading;

namespace TestThread

{

public class Tester

{

private int counter = 0;

static void Main(string[] args)

{

Tester t = new Tester();

t.DoTest();

Console.ReadLine();

}

public void DoTest()

{

Thread t1 = new Thread(new ThreadStart(Incrementer));

t1.IsBackground = true;

t1.Name = "Thread One";

t1.Start();

Console.WriteLine("Start thread {0}", t1.Name);

Thread t2 = new Thread(new ThreadStart(Incrementer));

t2.IsBackground = true;

t2.Name = "Thread Two";

t2.Start();

Console.WriteLine("Start thread {0}", t2.Name);

t1.Join();

t2.Join();

Console.WriteLine("All my threads are done.");

}

public void Incrementer()

{

try

{

while (counter < 1000)

{

int temp = counter;

temp++;

Thread.Sleep(1);

counter = temp;

Console.WriteLine("Thread {0}. Incrementer: {1}",

Thread.CurrentThread.Name, counter);

}

}

catch (ThreadInterruptedException)

{

Console.WriteLine("Thread {0} interrupted! Cleaning up...",

Thread.CurrentThread.Name);

}

finally

{

Console.WriteLine("Thread {0} Existing.",

Thread.CurrentThread.Name);

}

}

}

}

Kt qu t c l:

Hnh 2-1: Kt qu chng trnh khng s dng ng b ha Do ta cn phi ng b ha vic truy cp i tng counter.

C# cung cp i tng Lock thc hin cng vic ng b ha ny. Mt

lock s nh du mt critical section trn on m ng thi cung cp vic ng b

ha i vi i tng c ch nh khi lock c hiu lc. C php s dng mt

Lock yu cu kha cht mt i tng ri thi hnh mt cu lnh hoc mt khi lnh

ri s m kha cui cu hoc khi lnh . C# cung cp h tr trc tip kha cht

thng qua t cht lock. Ta s tra qua theo mt i tng qui chiu v theo sau t

cht l mt khi lnh

lock(expression) statement-block

Trong v d trn, c c kt qu nh mong mun, ta s sa hm

Incrementer li nh sau:

try

{

lock (this)

{

while (counter < 1000)

{

int temp = counter;

temp++;

Thread.Sleep(1);

counter = temp;

Console.WriteLine("Thread {0}. Incrementer: {1}",

Thread.CurrentThread.Name, counter);

}

}

}

// Cc khi catch v finally khng thay i

Kt qu thu c s l:

Hnh 2-2: Kt qu chng trnh s dng ng b ha Vic ng b cc lung l quan trng trong cc ng dng a lung. Tuy

nhin c mt s li tinh vi v kh kim sot c th xut hin c th l deadlock v

race condition.

2.2.3.2 Deadlock

Deadlock l mt li m c th xut hin khi hai lung cn truy nhp vo cc

ti nguyn b kho ln nhau. Gi s mt lung ang chy theo on m sau, trong

A, B l hai i tng tham chiu m c hai lung cn truy nhp:

lock (A)

{

// do something

lock (B)

{

// do something

}

}

Vo cng lc 1 lung khc ang chy :

lock (B)

{

// do something

lock (A)

{

// do something

}

}

C th xy ra bin c sau: lung u tin yu cu mt lock trn A, trong khi

vo cng thi im lung th hai yu cu lock trn B. Mt khong thi gian

ngn sau, lung A gp cu lnh lock(B), v ngay lp tc bc vo trng thi ng,

i cho lock trn B c gii phng. V tng t sau , lung th hai gp cu lnh

lock(A) v cng ri vo trng thi ng ch cho n khi lock trn A c gii phng

. Khng may, lock trn A s khng bao gi c gii phng bi v lung u tin

m lock trn A ang ng v khng thc dy cho n khi lock trn B c gii

phng iu ny cng khng th xy ra cho n khi no lung th hai thc dy. Kt

qu l deadlock. C hai lung u khng lm g c, i ln nhau gii phng lock.

Loi li ny lm ton ng dng b treo, ta phi dng Task Manager hy n.

Deadlock c th c trnh nu c hai lung yu cu lock trn i tng

theo cng th t . Trong v d trn nu lung th hai yu cu lock cng th t vi

lung u, A u tin ri ti b th nhng lung m lock trn a u s hon thnh

nhim v ca n sau cc lung khc s bt u.

2.2.3.3 Race condition

Race condition l ci ci g tinh vi hn deadlock. N him khi no dng

vic thc thi ca tin trnh , nhng n c th dn n vic d liu b li. Ni chung

n xut hin khi vi lung c gng truy nhp vo cng mt d liu v khng quan

tm n cc lung khc lm g hiu ta xem v d sau :

Gi s ta c mt mng cc i tng, mi phn t cn c x l bng mt

cch no , v ta c mt s lung gia chng lm tin trnh ny. Ta c th c mt

i tung gi l ArrayController cha mng i tng v mt s int ch nh s

phn t c x l .tac phng thc:

int GetObject(int index)

{

// tr v i tng vi ch mc c cho

}

V thuc tnh read/write

int ObjectsProcessed

{

// ch nh bao nhiu i tng c x l

}

By gi mi lung m dng x l cc i tng c th thi hnh on m

sau:

lock(ArrayController)

{

int nextIndex = ArrayController.ObjectsProcessed;

Console.WriteLine(Object to be processed next is +

NextIndex);

++ArrayController.ObjectsProcessed;

object next = ArrayController.GetObject();

}

ProcessObject(next);

Nu ta mun ti nguyn khng b gi qu lu , ta c th khng gi lock trn

ArrayController trong khi ta ang trnh by thng ip ngi dng . Do ta vit

li on m trn:


{

int nextIndex = ArrayController.ObjectsProcessed;

}

Console.WriteLine(Object to be processed next is + nextIndex);


{

++ArrayController.ObjectsProcessed;

object next = ArrayController.GetObject();

}

ProcessObject(next);

Ta c th gp mt vn . Nu mt lung ly ly i tng (i tng th 11

trong mng) v i ti trnh by thng ip ni v vic x l i tng ny. Trong

khi lung th hai cng bt u thi hnh cng on m gi ObjectProcessed, v

quyt nh i tng x l k tip l i tng th 11, bi v lung u tin vn

cha c cp nht.

ArrayController.ObjectsProcessed trong khi lung th hai ang vit n mn

hnh rng by gi n s x l i tng th 11, lung u tin yu cu mt lock

khc trn ArrayController v bn trong lock ny tng ObjectsProcessed. Khng

may, n qu tr. C hai lung u ang x l cng mt i tng v loi tnh hung

ny ta gi l Race Condition.

Chng 3: PHN TCH THIT K CHNG TRNH

3.1 Phn tch

3.1.1 Phn tch nhu cu thc tin:

Hin nay, mng Lan pht trin rt mnh c trong trng hc, cc c quan t

chc v c cc h gia nh. Chnh iu ko theo nhu cu lin lc trao i thng

tin trong mng Lan cng pht trin theo. Chnh v vy, mt chng trnh Chat phc

v cho nhu cu lin lc, trao i thng tin trong mng Lan l rt cn thit.

3.1.2 Yu cu ra:

Yu cu t ra l xy dng chng trnh Chat hot ng trong mng

Lan s dng Socket v Multithreading i hi cc chc nng nghip v sau:

Chat gia hai ngi vi nhau: Hai ngi gi thng ip qua li

cho nhau.

Chat gia mt nhm ngi: Mt ngi ng ra to mt nhm

Chat v mi cc thnh vin khc tham gia tho lun.

Mt User c kh nng thm v xa mt ngi vo Friend List

ca mnh c th lin lc mt cch d dng.

3.1.3 M hnh d liu mc quan nim:

Relationship

0,n

0,n

0,n

0,n

0,n

0,n GroupDetai l

Users

ID

Username

Password

State

Fullname

Email

Address

Integer

Variable characters (20)


Short integer




ID

GroupChat

GroupID

GroupName

CreateTime

Integer


Date & Time

GroupID

FriendList

Offl ineMessage

SendTime

Message...

Date & Time


Hnh 3-1: M hnh d liu mc quan nim

3.1.4 Phn tch cc thnh phn x l:

3.1.4.1 M hnh lung x l ng nhp

X l ng nhp:

M hnh x l: ng nhp thnh cng

Hin th mn hnh chnh

Thng bo ng nhp thnh cngGi danh sch Friend v OfflineMessage

Gi Username v Password

Tp hp cc Offline Message

Tp hp OfflineMessage ca ngi dng

Tp cc Friend ang Online v Offline

Danh sch cc Friend

Danh sch cc Friend

Cp nht trng thi ng nhp

Username v Password hp l

Kim tra Username v Password

Thng bo cho cc Friend ang Online ca ngi dng ny

Kim tra trng thi ng nhp

User cha ng nhp


Kim tra Username v PasswordYu cu ng nhp

Nhp Username v Password

Ngi dng

Mn hnh ng nhp Server Table UsersMn hnh chnh FriendList

Friend

Table OfflineMessage

Hin th mn hnh chnh

Thng bo ng nhp thnh cngGi danh sch Friend v OfflineMessage

Gi Username v Password

Tp hp cc Offline Message

Tp hp OfflineMessage ca ngi dng

Tp cc Friend ang Online v Offline

Danh sch cc Friend

Danh sch cc Friend

Cp nht trng thi ng nhp

Username v Password hp l

Kim tra Username v Password

Thng bo cho cc Friend ang Online ca ngi dng ny


User cha ng nhp


Kim tra Username v PasswordYu cu ng nhp

Nhp Username v Password

Hnh 3-2: M hnh x l ng nhp

M t qui trnh x l:

Khi mt User yu cu ng nhp h thng, Client s gi

Username v Password cho Server. Server s kim tra xem Username

v Password c hp l hay khng. Sau , Server s kim tra

Username ny ng nhp cha. Nu ng nhp thnh cng, Server

s ly danh sch cc Friend ang Offline v Online ca User km theo

danh sch cc tin nhn Offline (nu c) v gi cho User v cp nht

li trng thi ng nhp ca User. ng thi cng gi thng bo n

cc Users khc c Friend l User ny mi Online.

X l ng xut:

M hnh x l: Ngi dng ng xut khi chng trnh

Thng bo cho Server l ngi dng ng xut

Cp nht li trng thi ng nhp

Cp nht li cc Group m User tham gia

Ly danh sch cc Users c trong cc Group m User ny tham gia

Danh sch cc Users

Ly danh sch cc Users c Friend l User ny

Thng bo cho cc Users c l in quan l User ny ng xut

Ly danh sch cc Users c Friend l Users ny ang OnlineHin th mn hnh ng nhp

Chn chc nng ng xut

Ngi dng

Mn hnh chnh Server Table FriendList Table GroupDetailMn hnh ng nhp

Users

Table Users

Thng bo cho Server l ngi dng ng xut

Cp nht li trng thi ng nhp

Cp nht li cc Group m User tham gia

Ly danh sch cc Users c trong cc Group m User ny tham gia

Danh sch cc Users

Ly danh sch cc Users c Friend l User ny

Thng bo cho cc Users c l in quan l User ny ng xut

Ly danh sch cc Users c Friend l Users ny ang OnlineHin th mn hnh ng nhp

Chn chc nng ng xut

Hnh 3-3: M hnh x l ng xut

M t qui trnh x l:

Khi mt User yu cu ng xut li h thng, Client s hin th

li mn hnh ng nhp v ng thi gi thng bo ang xut n

Server. Server s gi thng bo ng xut ti cc Users c Friend l

User ny. Bn cnh , Server kim tra tt c cc Groups m User ny

ang tham gia. Server s gi thng bo hy n cc Group m User

ny l ngi khi to v s gi thng bo ng xut n cc Group

m User ny ch tham gia vi t cch l thnh vin. Cui cng, Server

s cp nht li trng thi ng nhp ca User.

3.1.4.2 M hnh lung x l gi tin nhn

Gi tin nhn Online:

M hnh x l: Gi tin nhn Online

Gi tin nhn v tn ngi gi

Gi tin nhn v tn ngi nhn

Ngi nhn Online

Kim tra Online

Kim tra ngi nhn Online

Hin th tin nhn

Yu cu gi tin nhn

Nhp tin nhn

Ngi gi Ngi nhn

Mn hnh chnh Server Table Users

Gi tin nhn v tn ngi gi


Ngi nhn Online

Kim tra Online


Hin th tin nhn

Yu cu gi tin nhn

Nhp tin nhn

Hnh 3-4: M hnh x l gi tin nhn Online

M t qui trnh x l:

Khi ngi dng nhp tin nhn v nhn phm Enter (hoc button

Send), Client s hin th tin nhn trn Tab Chat ng thi gi tin nhn

v tn ngi nhn ln cho Server. Server s kim tra xem ngi nhn

c phi ang Online hay khng. Nu ngi nhn ang Online, Server

s gi tin nhn v tn ngi gi. Khi nhn c tin nhn, Client s

hin th tin nhn thng qua mt Tab Chat (Tab ny s c m nu n

cha c trc ).

Gi tin nhn Offline:

M hnh x l: Gi tin nhn Offl ine

Lu tin nhn

Ngi nhn khng Online



Hin th tin nhn

Kim tra Online

Yu cu gi tin nhn

Nhp tin nhn

Ngi gi

Mn hnh chnh Server Table Users Table Offl ineMessage

Lu tin nhn

Ngi nhn khng Online



Hin th tin nhn

Kim tra Online

Yu cu gi tin nhn

Nhp tin nhn

Hnh 3-5: M hnh x l gi tin nhn Offline

M t qui trnh x l:

Khi ngi dng nhp tin nhn v nhn phm Enter (hoc button

Send), Client s hin th tin nhn trn Tab Chat ng thi gi tin nhn

v tn ngi nhn ln cho Server. Server s kim tra xem ngi nhn

c phi ang Online hay khng. Nu ngi nhn ang Offline, Server

s lu tin nhn cng tn ngi gi vo bng OfflineMessage gi

cho ngi nhn ln ng nhp tip theo.

3.1.4.3 M hnh lung x l FriendList

Thm mt Friend vo FriendList:

M hnh x l: Thm Friend vo FriendList

Hin th mn hnh thm FriendYu cu thm Friend

Thm Friend vo FriendList

Cha tn ti

Kim tra Friend tn ti trong FriendList

Kim tra tn ti

Gi tn Friend

Yu cu thm Friend

Cp nht mn hnh chnh

Thng bo thm Friend thnh cngThm Friend thnh cng

Friend tn ti

Kim tra tn ti

Kim tra tn ti

Nhp tn Friend

Yu cu nhp tn Friend cn thm

Ngi dng

Mn hnh chnh Server Table Users Table FriendListMn hnh thm Friend

Hin th mn hnh thm FriendYu cu thm Friend

Thm Friend vo FriendList

Cha tn ti


Kim tra tn ti

Gi tn Friend

Yu cu thm Friend

Cp nht mn hnh chnh

Thng bo thm Friend thnh cngThm Friend thnh cng

Friend tn ti

Kim tra tn ti

Kim tra tn ti

Nhp tn Friend

Yu cu nhp tn Friend cn thm

Hnh 3-6: M hnh x l thm Friend

M t qui trnh x l:

Khi ngi dng chn chc nng thm mt Friend vo

FriendList, mn hnh thm FriendList s c m ra. Ngi dng s

nhp tn ca Friend v sau Client s gi tn Friend ny ln cho

Server. Trc tin, Server s kim tra Friend ny c tn ti hay

khng. Tip theo, s kim tra Friend ny c thm vo FriendList

trc hay cha. Nu Friend ny cha c trong FriendList, Server

s thm Friend ny vo FriendList ca ngi dng. Cui cng, Server

s gi kt qu ca cng vic v cho Client. Da vo kt qu nhn

c, Client s thng bo cho ngi dng bit l vic thm thnh

cng hay tht bi (c hai nguyn nhn tht bi l Friend khng tn ti

v Friend c trong FriendList ri).

Xa mt Friend ra khi FriendList:

M hnh x l: Xa Friend ra khi FriendList

Cp nht mn hnh chnh

Thng bo xa thnh cng

Xa thnh cng

Xa Friend ra khi FriendList

Friend tn ti trong FriendList

Kim tra tn ti


Kim tra tn ti

Friend tn ti

Tn Friend

Kim tra tn ti

Yu cu xa Friend ra khi FriendListNhp tn Friend

Yu cu nhp tn Friend cn xa

Hin th mn hnh xa FriendYu cu xa Friend

Ngi dng

Mn hnh chnh ServerMn hnh xa Friend Table FriendListTable Users

Cp nht mn hnh chnh

Thng bo xa thnh cng

Xa thnh cng

Xa Friend ra khi FriendList

Friend tn ti trong FriendList

Kim tra tn ti


Kim tra tn ti

Friend tn ti

Tn Friend

Kim tra tn ti

Yu cu xa Friend ra khi FriendListNhp tn Friend

Yu cu nhp tn Friend cn xa

Hin th mn hnh xa FriendYu cu xa Friend

Hnh 3-7: M hnh x l xa Friend

M t qui trnh x l:

Khi ngi dng chn chc nng xa mt Friend vo

FriendList, mn hnh thm FriendList s c m ra. Ngi dng s

nhp tn ca Friend v sau Client s gi tn Friend ny ln cho

Server. Trc tin, Server s kim tra Friend ny c tn ti hay

khng. Tip theo, s kim tra Friend ny c thm vo FriendList

trc hay cha. Nu Friend ny c trong FriendList, Server s

xa Friend ny ra khi FriendList ca ngi dng. Cui cng, Server

s gi kt qu ca cng vic v cho Client. Da vo kt qu nhn

c, Client s thng bo cho ngi dng bit l vic Xa thnh cng

hay tht bi (c hai nguyn nhn tht bi l Friend khng tn ti v

Friend cha c trong FriendList) ng thi cp nht li mn hnh

chnh nu cn.

Ghi ch: Chc nng ny c th c gi khi ngi dng nhn

phm Delete trong Listbox FriendList.

3.1.4.4 M hnh lung x l Group Chat

Khi User to Group:

M hnh x l: To Group

Tp hp cc User tn ti

Kim tra tn ti

Gi thng bo mi cho cc User

M Tab Group Chat

Gi tn cc Users v tn Group

Yu cu to Group

Nhp tn cc User cn mi vo Group

Yu cu chn cc User c mi vo Group

Hin th mn hnh to GroupYu cu to Group

Ngi to group

Mn hnh chnh Mn hnh to group Table Users

Ngi c mi

Server

Tp hp cc User tn ti

Kim tra tn ti

Gi thng bo mi cho cc User

M Tab Group Chat

Gi tn cc Users v tn Group

Yu cu to Group

Nhp tn cc User cn mi vo Group

Yu cu chn cc User c mi vo Group

Hin th mn hnh to GroupYu cu to Group

Hnh 3-8: M hnh x l to Group

M t qui trnh x l:

Khi ngi dng chn chc nng Invite Group th mn hnh to

Group s xut hin. Ngi dng nhp danh sch cc Users mun mi

v c th nhp thm Invite Message ri nhn Invite. Client s t pht

sinh ra tn Group v s gi km n vi danh sch cc Users mun mi

ng thi cng m thm mt Tab Group Chat. Server s lc ra cc

Users ang Online trong danh sch cc Users c mi. Sau ,

Server s gi li mi km theo tn ngi mi n cc Users c

mi.

Khi User ng gia nhp Group:

M hnh x l: ng gia nhp Group

Thng bo cho cc User tham gia trc cp nht li Tab Group Chat

Thm ngi dng ny vo Group ChatCp nht Tab Group Chat

ng tham gia Group

Tp hp cc User tham gia Group

Thm Group

Kim tra Group


Cc User tham gia Group

Group cha tn ti

M Tab GroupChatng gia nhp Group

Mn hnh chnh Server Table GroupChat Table GroupDetai l

Ngi dng User tham gia Group

Thng bo cho cc User tham gia trc cp nht li Tab Group Chat

Thm ngi dng ny vo Group ChatCp nht Tab Group Chat

ng tham gia Group


Thm Group

Kim tra Group


Cc User tham gia Group

Group cha tn ti

M Tab GroupChatng gia nhp Group

Hnh 3-9: M hnh x l ng gia nhp Group

M t qui trnh x l:

Khi ngi dng ng li mi gia nhp nhm, Client s gi

thng bo ng cho Server. Server s kim tra xem Group ny

c lu hay cha (Group cha c lu nu cha c ngi dng no

ng tham gia). Sau , Server s lu ngi dng ny vo

GroupDetail. Cui cng, Server s gi tn tt c cc Users tham

gia Group cho ngi dng, ng thi cng gi thng bo n cho cc

Users trong Group l ngi dng ny ng gia nhp nhm.

Khi User thot khi Group:

M hnh x l:

Ri khi Group

Gi thng bo thot khi Group km theo tn GroupLy danh sch cc Users c trong Group

Cp nht li Group

Thng bo n cc Users trong Group

Danh sch cc User c trong Group

Cp nht li mn hnh chnh

ng Tab Group Chat

Ngi dng

Mn hnh chnh Server Table GroupDetail

Users

Gi thng bo thot khi Group km theo tn GroupLy danh sch cc Users c trong Group

Cp nht li Group

Thng bo n cc Users trong Group

Danh sch cc User c trong Group

Cp nht li mn hnh chnh

ng Tab Group Chat

Hnh 3-10: M hnh x l thot khi Group

M t qui trnh x l:

Khi mt ngi dng tt Tab Group Chat, Client s gi thng

bo thot khi Group cho Server. Server trc tin kim tra ngi

dng ny c phi l ngi to Group hay khng. Nu khng phi,

Server s gi thng bo ti cc Users khc trong Group. Cui cng,

Server s cp nht li GroupDetail.

Khi User hy Group:

M hnh x l:

Hy Group

Gi thng bo thot khi Group

Xa Group

Xa GroupDetail

Thng bo hy Group

Danh sch cc Users c trong Group

Ly danh sch cc Users c trong Group

Kim tra ng

Kim tra ngi to group

Kim tra ngi dng c to ra group ny hay khng

ng Tab Group Chat Cp nht mn hnh chnh

Ngi dng

Mn hnh chnh Server Table GroupChat Table GroupDetail

Users

Gi thng bo thot khi Group

Xa Group

Xa GroupDetail

Thng bo hy Group

Danh sch cc Users c trong Group

Ly danh sch cc Users c trong Group

Kim tra ng

Kim tra ngi to group

Kim tra ngi dng c to ra group ny hay khng

ng Tab Group Chat Cp nht mn hnh chnh

Hnh 3-11: M hnh x l hy Group

M t:

Khi mt ngi dng tt Tab Group Chat, Client s gi thng

bo thot khi Group cho Server. Server trc tin kim tra ngi

dng ny c phi l ngi to Group hay khng. Nu ng, Server

s gi thng bo hy Group ti cc Users khc trong Group. Cui

cng, Server s xa Group ny khi GroupDetail v GroupChat.

Ghi ch: Khi nhn c thng bo hy Group t Users, Client

s tt Tab Group Chat tng ng ng thi thng bo cho ngi

dng.

Khi User gi tin nhn ti cc thnh vin trong Group:

M hnh x l:

Gi tin nhn trong Group

Danh sch cc Users trong Group

Ly danh sch cc Users trong Group

Hin th tin nhn

Gi tin nhn km theo tn ngi gi n cc Users trong Group

Gi tin nhn km theo tn Group

Chn Tab Group Chat v yu cu chc nng gi tin nhn

Nhp tin nhn

Ngi gi

Mn hnh chnh Server Table GroupDetail

Cc Users trong Group

Danh sch cc Users trong Group

Ly danh sch cc Users trong Group

Hin th tin nhn

Gi tin nhn km theo tn ngi gi n cc Users trong Group

Gi tin nhn km theo tn Group

Chn Tab Group Chat v yu cu chc nng gi tin nhn

Nhp tin nhn

Hnh 3-12: M hnh x l gi tin nhn trong Group

M t qui trnh x l:

Khi ngi dng nhp tin nhn v nhn button Send trong Tab

Group Chat, Client s gi tin nhn v tn Group cho Server. Da vo

tn Group nhn c, Server s tm tt c cc Users tham gia

Group v gi tin nhn km theo tn ngi gi n cc Users ny.

3.2 Thit k cc lp x l

3.2.1 Lp DataLayer:

M hnh:

Hnh 3-13: M hnh lp DataLayer

Chc nng: X l cc cu lnh v c s d liu tng qut, kim tra v

thay i kt ni n c s d liu.

3.2.2 Lp MyDatabase:

M hnh:

Hnh 3-14: M hnh lp MyDatabase

Chc nng: Thc hin cc cu lnh Sql cn thit v thc thi cc Store

Procedure c sn trong c s d liu.

3.2.3 Lp ImageListBoxItem

M hnh:

Class

Fields

_myImageIndex : int

_myText : string

_myTextColor : Color

Properties

ImageIndex { get; set; } : int

Text { get; set; } : string

TextColor { get; set; } : Color

Methods

ImageListBoxItem()

ImageListBoxItem(string text)

ImageListBoxItem(string text, int index, Color color)

ToString() : string

Hnh 3-15: M hnh lp ImageListBoxItem

Chc nng: Thao tc vi Item ca mt ImageListBox.

3.2.4 Lp ImageListBox:

M hnh:

ListBox

Class

Fields

_myImageList : ImageList

Properties

ImageList { get; set; } : ImageList

Methods

ImageListBox()

ImageListBox(ImageList imgList)

OnDrawItem(DrawItemEventArgs e) : void

SetImageIndex(int index, int imgIndex) : void

SetTextColor(int index, Color color) : void

Hnh 3-16: M hnh lp ImageListBox

Chc nng: To ra mt loi ListBox mi vi Item c th cha c

text v hnh nh.

3.2.5 Lp Settings:

M hnh:

Class

Fields

authencation : int

databasename : string

password : string

servername : string

username : string

Properties

Authencation { get; set; } : int

DatabaseName { get; set; } : string

Password { get; set; } : string

ServerName { get; set; } : string

Username { get; set; } : string

Methods

LoadSettings() : void

SaveSettings() : void

SetConnection(ref string connStr) : void

Settings()

Hnh 3-17: M hnh lp Settings

Chc nng: Chnh sa v sao lu thng tin ng nhp vo c s d

liu.

3.2.6 Lp MultilineListBoxItem:

M hnh:

Hnh 3-18: M hnh lp MultilineListBoxItem

Chc nng: Thao tc vi Item ca mt MultilineListBox

3.2.7 Lp MultilineListBox:

M hnh:

ListBox

Class

Fields

tbox : TextBox

Methods

MultilineListBox()


OnMeasureItem(MeasureItemEventArgs e) : void

Hnh 3-1: M hnh lp MultilineListBox

Chc nng: K tha lp ListBox to ra mt loi ListBox mi c

th thm mt Item lu d liu trn nhiu dng.

3.2.8 Lp TabControlEx:

M hnh:

TabControl

Class

Fields

PreRemoveTabPage : PreRemoveTab

Methods

CloseTab(int i) : void


OnMouseDown(MouseEventArgs e) : void

OnMouseLeave(EventArgs e) : void

OnMouseMove(MouseEventArgs e) : void

TabControlEx()

Hnh 3-19: M hnh lp TabControlEx

Chc nng: K tha t mt TabControl to ra mt loi TabControl

mi c th ng, m trc tip.

3.2.9 LpMyDataPack:

M hnh:

Class

Fields

array : int[]

groupName : string

message : string

name : string

Properties

Arr { get; } : int[]

GroupName { get; } : string

Message { get; } : string

Name { get; } : string

Methods

MyDataPack()

PackData(int[] arr, string _name, string _mess, string _groupName) : byt

UnPackData(byte[] data) : void

Hnh 3-20: M hnh lp MyDataPack

Chc nng: Lp MyDataPack c 2 nhim v. Nhim v th nht l

chuyn mt mng lu cc chc nng, chui tn, tn nhm, tin nhn thnh

mt dy byte truyn i. Nhim v th hai l chuyn chui byte nhn

c thnh mng lu cc chc nng, chui tn, tn nhm v tin nhn

a cho chng trnh x l.

3.2.10 Lp ClientHandler:

M hnh:

Class

Fields

dp : MyDataPack

error : string

mainFrm : frmServer

myClient : TcpClient

myData : MyDatabase

myPort : string

UserID : int

Username : string

Methods

AddRemoveUserInGroup(string leader, string groupName, bool removeUser) : void

ClientHandler(TcpClient client, string port, frmServer MainFrm)

CheckConnect(string Name, string Pass) : int

CheckUserExist(string user) : bool

CheckUserOnline(string user) : int

DestroyAGroup(string groupName) : void

DestroyAllGroup() : void

GetGroupUser(string groupName) : void

NewGroupChat(string fname, string groupName) : void

ReceiveData() : void

SendFriendList(string user) : string

SendGroupInvite(string fname, string mess, string groupname) : void

SendMessToGroup(string groupMess, string groupName) : void

SendOfflineMessage() : string

SendUserState(bool state) : void

SignOut1Group(int groupID) : void

SignOutAllGroup() : void

Hnh 3-21: M hnh ClientHandler

Chc nng: Qun l mt kt ni ca Client.

3.3 Mt s qui tc v hm x l c bn

3.3.1 Qui tc gi d liu trong mng:

Gi d liu c gi qua li trong mng l mt khi bytes c di

ln nht l 2048 bytes. Khi bytes ny c cu trc nh sau:

2 bytes u tin: nh du cc chc nng ca chng trnh.

2 bytes tip theo: nh du cc chc nng con thuc chc nng

chnh.

2 bytes tip theo: Lu cc gi tr c gi km theo nu c.

4 bytes k tip: nh du ln ca khi bytes lu tn ngi

nhn.

4 bytes tip theo: nh du ln ca khi bytes lu tin nhn.

4 bytes tip theo: nh du ln ca khi bytes lu tn

nhm.

Cc bytes cn li: Ln lt lu khi bytes cha tn, tin nhn v

tn nhm.

Ghi ch: Cc chui tn, tin nhn v tn nhm s c m ha UTF8

trc khi c ng gi vo khi bytes.

3.3.2 Mt s hm x l c bn:

3.3.2.1 Hm PackData

M ngun:

Bng 3-1: M ngun hm PackData

public byte[] PackData(int[] arr, String _name, String _mess, String _groupName)

{

byte[] nameByte = Encoding.UTF8.GetBytes(_name);

byte[] messByte = Encoding.UTF8.GetBytes(_mess);

byte[] groupByte = Encoding.UTF8.GetBytes(_groupName);

int len = arr.Length * 2 + 12 + nameByte.Length + messByte.Length +

groupByte.Length;

byte[] data = new byte[len];

int offset = 0;

for (int i = 0; i < arr.Length; i++)

{

Buffer.BlockCopy(BitConverter.GetBytes(arr[i]), 0, data, offset, 2);

offset += 2;

}

offset = 6;

Buffer.BlockCopy(BitConverter.GetBytes(nameByte.Length), 0,

data, offset, 4);

offset += 4;

Buffer.BlockCopy(BitConverter.GetBytes(messByte.Length), 0,

data, offset, 4);

offset += 4;

Buffer.BlockCopy(BitConverter.GetBytes(groupByte.Length), 0,

data, offset, 4);

offset += 4;

Buffer.BlockCopy(nameByte, 0, data, offset, nameByte.Length);

offset += nameByte.Length;

Buffer.BlockCopy(messByte, 0, data, offset, messByte.Length);

offset += messByte.Length;

Buffer.BlockCopy(groupByte, 0, data, offset, groupByte.Length);

return data;

}

Input: Mng lu cha gi tr cc chc nng, tn ngi nhn, tin nhn,

tn nhm.

Output: Khi bytes c c ng gi.

Chc nng: ng gi khi bytes trc khi gi i.

3.3.2.2 Hm UnPackData

M ngun:

Bng 3-2: M ngun hm UnPackData

public void UnPackData(byte[] data)

{

int offset = 0;

for (int i = 0; i < 3; i++ )

{

byte[] tbytes = new byte[4];

Buffer.BlockCopy(data, offset, tbytes, 0, 2);

array[i] = BitConverter.ToInt32(tbytes, 0);

offset += 2;

}

int len;

byte[] bytes = new byte[4];

Buffer.BlockCopy(data, 6, bytes, 0, 4);

len = BitConverter.ToInt32(bytes, 0);

offset = 18;

if (len != 0)

{

byte[] nameByte = new byte[len];

Buffer.BlockCopy(data, offset, nameByte, 0, len);

name = Encoding.UTF8.GetString(nameByte, 0, len);

}

offset += len;



if (len != 0)

{

byte[] messByte = new byte[len];

Buffer.BlockCopy(data, offset, messByte, 0, len);

message = Encoding.UTF8.GetString(messByte, 0, len);

}

offset += len;



if (len != 0) {

byte[] groupByte = new byte[len];

Buffer.BlockCopy(data, offset, groupByte, 0, len);

groupName = Encoding.UTF8.GetString(groupByte, 0, len);

}

}

Input: Khi bytes c nh du.

Chc nng: Gii ng gi khi bytes nhn c. Kt qu nhn c

l mng cha cc chc nng, chui tn ngi nhn, tin nhn v tn nhm

c lu trong lp DataPack.

3.3.2.3 Hm SaveSettings v LoadSettings

M ngun:

Bng 3-3: M ngun hm SaveSettings v LoadSettings

public void SaveSettings()

{

FileStream fs = File.Open("Settings.ini", FileMode.OpenOrCreate,

FileAccess.Write);

BinaryFormatter bf = new BinaryFormatter();

bf.Serialize(fs, this);

fs.Close();

}

public void LoadSettings()

{

BinaryFormatter bf = new BinaryFormatter();

FileStream fs = File.Open("Settings.ini", FileMode.Open, FileAccess.Read);

Settings sett = (Settings)bf.Deserialize(fs);

servername = sett.ServerName;

authencation = sett.Authencation;

username = sett.Username;

password = sett.Password;

databasename = sett.DatabaseName;

fs.Close();

}

Chc nng: Hai hm ny c chc nng lu v ly thng tin trong tp

tin Settings.ini thip lp kt ni n c s d liu.

3.3.2.4 Hm theadListen

M ngun:

Bng 3-4: M ngun hm theadListen

private void threadListen()

{

myTcpListener = new TcpListener(IPAddress.Any,Convert.ToInt16(port));

myTcpListener.Start();

while (true)

{

try

{

myClient = myTcpListener.AcceptTcpClient();

allClient.Add(myClient);

ClientHandler clientHandler = new ClientHandler(myClient, port, this);

thdHandler = new Thread(new

ThreadStart(clientHandler.ReceiveData));

thdHandler.Start();

}

catch

{

myTcpListener.Stop();

}

}

}

Chc nng: Gip Server tip nhn cc kt ni t Client, vi mi

Client tip nhn c th m mt i tng ClientHandler qun l v

to mt Thread thao tc.

3.4 Thit k d liu

3.4.1 Chun ha d liu:

Users (ID, Username, Password, State, Fullname, Email, Address)

FriendList(UserID, FriendID)

OfflineMessage(UserID, SenderID, SendTime, Message)

GroupChat(GroupID, UserID, GroupName, CreateTime)

GroupDetail(FriendID, GroupID)

3.4.2 M hnh d liu mc vt l:

FK_GROUPCHA_RELATIONS_USERS

FK_GROUPDET_GROUPDETA_USERS

FK_GROUPDET_GROUPDETA_GROUPCHA

FK_FRIENDLI_FRIENDLIS_USERS

FK_FRIENDLI_FRIENDLIS_USERS

FK_OFFLINEM_OFFLINEME_USERS

FK_OFFLINEM_OFFLINEME_USERS

GroupDetail

FriendID

GroupID

int

int

Users

ID

Username

Password

State

Fullname

Email

Address

int

varchar(20)

varchar(15)

bit

nvarchar(50)

varchar(50)

nvarchar(50)

GroupChat

GroupID

UserID

GroupName

CreateTime

int

int

varchar(30)

datetime

FriendList

UserID

FriendID

int

int

Offl ineMessage

UserID

SenderID

SendTime

Message

int

int

datetime

nvarchar(500)

Hnh 3-22: M hnh d liu mc vt l

3.4.3 Thit k d liu:

Gm c cc bng Users, FriendList, OfflineMessage, GroupChat, GroupDetail

lu tr cc thng tin v user ng nhp, quan h gia cc user, lu tin nhn

offline ca cc user v lu tm thi thng tin cc nhm Chat.

Table Users

Chc nng: Lu thng tin v User

Danh sch cc thuc tnh:

Bng 3-5: Table Users

STT Tn thuc tnh Kiu d liu Din gii

1 ID int (4) T ng tng, Kha chnh

2 Username varchar (20) Tn ng nhp

3 Password varchar (15) Mt khu ng nhp

4 State bit (1) Trng thi ca User

5 Fullname nvarchar (50) Tn y ca User

6 Email varchar (30) Email ca User

7 Address nvarchar (50) a ch ca User

Table FriendList

Chc nng: Lu thng tin v quan h gia cc User


Bng 3-6: Table FriendList


1 UserID int (4) ID ca User, Kha chnh

2 FriendID int (4) ID ca Friend, Kha chnh

Table OfflineMessage

Chc nng: Lu cc tin nhn offline ca User


Bng 3-7: Table OfflineMessage


1 UserID int (4) ID ca ngi nhn, Kha chnh

2 SenderID int (4) ID ca ngi gi, Kha chnh

3 SendTime datetime (8) Thi im gi tin nhn, Kha

chnh

4 Message nvarchar (500) Ni dung tin nhn

Table GroupChat

Chc nng: Lu tm thi thng tin ca cc nhm Chat


Bng 3-8: Table GroupChat


1 GroupID int (4) T ng tng, Kha chnh

2 UserID int (4) ID ca User to nhm

3 GroupName varchar (20) Tn ca nhm

4 CreateTime datetime (8) Thi im to nhm

Table GroupDetail

Chc nng: Lu thng tin chi tit ca cc nhm Chat


Bng 3-9: Table GroupDetail


1 GroupID int (4) ID ca Group, Kha chnh

2 FriendID int (4) ID ca ca User thnh vin trong

Group, Kha chnh

3.4.4 M t cc rng buc ton vn:

Rng buc 1: Username trong Table Users khng c trng nhau.

Rng buc 2: UserID v FriendID trong Table FriendList phi tn ti

trong Table Users.

Rng buc 3: UsersID trong Table GroupChat phi tn ti trong Table

Users.

Rng buc 4: GroupID trong Table GroupDetail phi tn ti trong

Table GroupChat.

Rng buc 5: FriendID trong Table GroupDetail phi tn ti trong

Table Users.

Rng buc 6: SenderID v UserID trong Table OfflineMessage phi

tn ti trong Table Users.

3.5 Thit k giao din

3.5.1 Mn hnh ng nhp

Hnh 3-23: Mn hnh ng nhp

Chc nng: Dng ng nhp vo chng trnh.

3.5.2 Mn hnh chnh

Hnh 3-24: Mn hnh chnh

Chc nng: Cha tt c cc chc nng chnh ca chng trnh.

3.5.3 Mn hnh thm Friend

Hnh 3-25: Mn hnh thm Friend

Chc nng: Xut hin khi ngi dng cn thm mt Friend.

3.5.4 Mn hnh xa Friend

Hnh 3-26: Mn hnh xa Friend

Chc nng: Khi ngi dng chn chc nng xa Friend th mn hnh

ny xut hin v cho php ngi dng nhp vo tn Friend cn xa.

3.5.5 Mn hnh Chat With

Hnh 3-27: Mn hnh Chat With

Chc nng: Khi ngi dng chn chc nng Chat With, mn hnh ny

s xut hin v cho php ngi dng nhp tn User cn Chat.

3.5.6 Mn hnh Invite Group

Hnh 3-28: Mn hnh Invite Group

Chc nng: Mn hnh ny s xut hin khi ngi dng chn chc

nng Invite Group v cho php ngi dng mi nhng Users c trong

danh sch bn b v nhng Users khc (thng qua chc nng Invite

Another). Ngoi ra, ngi dng c th nhp vo li mi nhm.

3.5.7 Mn hnh Invite Another

Hnh 3-29: Mn hnh Invite Another

Chc nng: Hin th khi ngi dng click chn button Invite Another

trong mn hnh Invite Group. Mn hnh ny cho php ngi dng ty

chn tn User mun mi vo nhm.

3.5.8 Mn hnh Settings

Hnh 3-30: Mn hnh Invite Another

Chc nng: Dng hiu chnh li kt ni n c s d liu.

Chng 4: CI T TH NGHIM

4.1 Ci t chng trnh

4.1.1 Ci t Server

Yu cu h thng:

My tnh phi ci t .Net Framework 2.0 tr ln.

My tnh phi c ci t Microsoft SQL Server 2000 tr ln

hoc Microsoft SQL Server Desktop Engine 2000 (MSDE).

Hng dn ci t:

Ci t MSDE:

i vi nhng my cha ci Microsoft SQL Server, ngi dng c

th ci t MSDE thay th. Cch ci t MSDE nh sau:

Bc 1: Vo Start -> Run, g cmd.

Bc 2: Sau khi m cmd, ta thc hin thao tc nh trn hnh

(vi C:\MSDE l ng dn ca th mc ci t MSDE, duytue l

Password ca Login name Sa.

Hnh 4-1: Ci t Microsoft SQL Destop Engine

Ci t Server:

Thc hin ln lt cc bc sau:

Bc 1: Nhp p tp tin Server.msi tin hnh ci t

chng trnh. Mn hnh Wellcome hin ra, nhn Next tip tc tin

trnh ci t.

Bc 2: Khi Mn hnh Customer Information hin ra, trong

Username ta nhp tn ngi dng; trong Organization, ta nhp tn

t chc s dng chng trnh. Sau nhn Next tip tc.

Hnh 4-2: Ci t Server Mn hnh Customer Information

Bc 3: Khi mn hnh Destination Folder hin ra, ta c th

nhp nt Change thay i th mc ci t. Sau , nhn nt

Next tip tc.

Hnh 4-3: Ci t Server Mn hnh Destination Folder

Bc 4: Khi mn hnh SQL Login hin ra, ta nhn nt

Browse chn Server Name. C th chn mt trong hai cch kt ni

ti c s d liu l Windows Authencation v Sql Server

Authencation. Sau khi thit nh xong kt ni, nhn nt Next

chng trnh tin hnh ci t.

Hnh 4-4: Ci t Server Mn hnh SQL Login

Bc 5: Khi chng trnh ci t xong, nhn nt Finish

kt thc (c th m chng trnh ngay sau khi ci t bng cch tc

chn nt Launch Server).

Hnh 4-5: Ci t Server Mn hnh Finish

4.1.2 Ci t Client

Yu cu h thng: My tnh phi c ci t .NET Framework 2.0

Thc hin ln lt cc bc sau:

Bc 1: Nhp p tp tin Lan Chat.msi tin hnh ci t

chng trnh. Mn hnh Wellcome hin ra, nhn Next tip tc tin

trnh ci t.

Bc 2: Khi Mn hnh Customer Information hin ra, trong

Username ta nhp tn ngi dng; trong Organization, ta nhp tn

t chc s dng chng trnh. Sau nhn Next tip tc.

Hnh 4-6: Ci t Client Mn hnh Customer Information

Bc 3: Khi mn hnh Destination Folder hin ra, ta c th

nhp nt Change thay i th mc ci t. Sau , nhn nt

Next chng trnh thc hin vic ci t.

Hnh 4-7: Ci t Client Mn hnh Destination Folder

Bc 4: Khi chng trnh ci t xong, nhn nt Finish

kt thc (c th m chng trnh ngay sau khi ci t bng cch tc

chn nt Launch Lan Chat).

Hnh 4-8: Ci t Client Mn hnh Finish

4.2 Hng dn s dng

S dng d liu sn c:

Sau khi chng trnh Server c m, ngi dng c th dng Client

tin hnh ng nhp v s dng chng trnh.

Chng trnh c 3 User sn c:

Username Password

duytue 123

tester 123

xeko 123

Thm d liu mi: Do chc nng ng k Users cha c xy dng nn

ngi s dng Server c th dng chn chc nng Show All Users trong

menu chnh thm hoc xa Users.

Chng 5: KT LUN

5.1 Kt qu t c

ti Chng trnh Chat thc hin c cc ni dung sau:

Tm hiu c cch thc lp trnh Socket v lp trnh a lung trn

mi trng .NET

Tm hiu c cch thc hot ng ca mt chng trnh Chat n

gin.

Xy dng c mt chng trnh Chat n gin ci t trn mng

Lan vi mt s tnh nng nh: gi tin nhn trc tip gia cc Users, gi

tin nhn Offline, lu danh sch bn b, to mt nhm Chat.

5.2 Hng pht trin

V c bn, nghin cu t c nhng yu cu t ra. Tuy nhn

nu c iu kin, n s c gng pht trin thm cc chc nng sau:

Cho php ngi dng c th to mt ti khon mi v c th ty

chnh li cc thng tin cc thng tin c nhn.

Cho php ngi dng qun tr c th Back up d liu.

Hon thin cc chc nng trong Group Chat.

H tr gi hnh nh khi Chat.

H tr chc nng gi file.

H tr chc nng Voice Chat v Webcam.

TI LIU THAM KHO

Ti liu:

Ting Vit

[1] Dng Quang Thin, 2005, .NET ton tp.

[2] Nguyn Ngc Bnh Phng, 2005, Cc gii php lp trnh C#.

Ting Anh

[3] Sybex, 2003, C-Sharp Network Programming.

[4] Fiach Reid, 2004, Network Programming in .NET.

Website:

[1] http://congdongcviet.com

[2] http://www.codeproject.com

[3] http://www.codeguru.com

Documents

Baocaodoan_2008 - Lap Trinh Mang.doc