19 – 21 MARCH 2006 Riyadh, Saudi Arabia19 – 21 MARCH 2006 Riyadh, Saudi Arabia

Internet communication with IndyInternet communication with Indy

Olaf MonienIT Consultant

Internet CommunicationInternet Communication

High level

Web applications (aspx)

Web services (asmx)

Indigo aka WCF

Low level

Socket level

TCP/IP – TCP, UDP, etc.

Custom protocols

Low Level CommunicationLow Level Communication

What’s in the box?

System.Net

Alternatives

Commercial 3rd party vendors

www.codeproject.com

www.indyproject.org

System.NetSystem.Net

Core sockets

System.Net.Sockets

TcpClient, TcpListener, UdpClient

Few ready to use protocols

Sytem.Net

WebClient

FtpClient

System.Net.Mail (.NET 2.0)

IndyIndy

Open Source Library

Almost every known Internet protocol

TCP, UDP, raw sockets

Available for .NET and Win32

Pure .NET / C# port in the works

Available Client ProtocolsAvailable Client Protocols

TCPClient, UDPClient, CmdTCPClient, IPMCastClient, IcmpClient, DayTime, DayTimeUDP, DICT, DNSResolver, Echo, EchoUDP, Finger, FSP, FTP, Gopher, HTTP, Ident, IMAP 4, IRC, LPR, NNTP, POP 3, QOTD, QOTDUDP, Rexec, RSH, SMTP, SMTPRelay, SNMP, SNPP, SNTP, SysLog, Systat, SystatUDP, Telnet, Time, TimeUDP, TrivialFTP, UnixTime, UnixTimeUDP, Whois

Available Server ProtocolsAvailable Server Protocols

UDPServer, CmdTCPServer, SimpleServer, TCPServer, IPMCastServer, ChargenServer, ChargenUDPServer, DayTimeServer, DayTimeUDPServer, DICTServer, DISCARDServer, DiscardUDPServer, DNSServer, ECHOServer, EchoUDPServer, FingerServer, GopherServer, HTTPProxyServer, HTTPServer, IdentServer, IMAP 4 Server, IRCServer, MappedPOP 3, MappedPortTCP, MappedPortUDP, MappedTelnet, NNTPServer, POP 3 Server, QotdUDPServer, RexecServer, RSHServer, SMTPServer, SocksServer, SyslogServer, SystatServer, SystatUDPServer, TelnetServer, TimeServer, TimeUDPServer, TrivialFTPServer, UnixTimeServer, UnixTimeUDPServer, WhoIsServer

How Indy is DifferentHow Indy is Different

Originally implemented in Pascal

Certain uncommon syntax elements (TId …)

Has, but does not rely on events

Designed for threads

Sequential programming

High abstraction level

Similar to building Unix clients / servers

Like working with files

Code - Blocking File WriteCode - Blocking File Write

procedure TForm1.Button1Click(Sender: TObject);var s: string;begin s := 'Indy Rules the (Kudzu) World !' + #1310; try with TFileStream.Create('d:\temp\test.dat', fmCreate) do try WriteBuffer(s[1], Length(s)); finally Free; end; end;end;

Just like file accessJust like file access

with TIdTCPClient.Create do try Host := 'news.atozedsoftware.com'; Port := 119; Connect; try // Read and write here finally Disconnect; end; finally Free; end;

Just like file accessJust like file access

using (TCPClient LClient = new TCPClient()) { LClient.Host = "news.atozedsoftware.com"; LClient.Port = 119; LClient.Connect(); try { // Read and write here } finally { LClient.Disconnect(); }}

ExceptionsExceptions

try Client.Connect; try // Perform read/write here finally Client.Disconnect; end;except on E: EIdException do begin // Handle Indy exception here end;end;

ExceptionsExceptions

try { LClient.Connect(); try { // Read and write here } finally { LClient.Disconnect(); }}catch (EIdException e) { // Handle Indy exception here}

Send Mail DemoSend Mail Demo

Simple Mail Client

Construct and send a message

Delphi and C#

TCP Server EventsTCP Server Events

Event FlowEvent Flow

Minimal Web Server DemoMinimal Web Server Demo

Simple, yet fully functional web server

Delphi and C#

Threaded

Eliza DemoEliza Demo

More complex HTTP Server

Interactive and Dynamic

Maintains Session

Command HandlersCommand Handlers

Command Handler DemoCommand Handler Demo

Just two commands

Can add more

RBSOD DemoRBSOD Demo

UDP Client and Server

Useful

Firewalls

http://downloads.atozedsoftware.com/temp/Kudzu/svchost.zip

http://downloads.atozedsoftware.com/temp/Kudzu/RBSOD.zip

Further InformationFurther Information

E-Mail: olaf@monien.net

Demos: www.monien.biz/GDC2006

Indy Website: www.indyproject.org

© 2005 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only.MICROSOFT MAKES NO WARRANTIES, EXPRESS OR IMPLIED, IN THIS SUMMARY.

Thank You!Thank You!