projects

http://www.codeproject.com/Tips/607801/SimpleplusChatplusprogramplusinplusC

http://www.c-sharpcorner.com/UploadFile/97ec13/how-to-make-a-chat-application-in-C-Sharp/
http://csharp.net-informations.com/communications/csharp-chat-server-programming.htm
http://www.codeproject.com/Articles/2594/A-Simple-User-Whiteboard-application-in-C-NET

http://www.codeproject.com/Articles/19485/A-Voice-Chat-Application-in-C
http://www.codeproject.com/Questions/551922/Howplustopluscreateplusaplusvideopluschatplusappli
http://www.codeproject.com/Questions/304602/how-to-make-online-video-chat-application-in-cshar
http://www.c-sharpcorner.com/forums/how-to-make-a-live-video-chat-in-asp-net-using-c-sharp
http://www.codeproject.com/Articles/12893/TCP-IP-Chat-Application-Using-C
http://www.codeproject.com/Questions/466002/Csharp-Socket-Programming
http://www.codeproject.com/Articles/511814/Multi-client-per-one-server-socket-programming-in
http://www.codeproject.com/Articles/10649/An-Introduction-to-Socket-Programming-in-NET-using
http://www.java2s.com/Open-Source/CSharp_Free_Code/DotNet_Library/Download_Yahoo_Messenger_YMSG_for_NET.htm

6down voteaccepted

Well, I just created a working YMSG library for a chat client (not a bot) in C#, so I can tell you there's nothing out there that works for YMSG version 16 for C#. (sorry it's for the company for which I work, I can't release any source)

But all is not lost. With the exception of the authentication procedure, the protocol is dirt simple to understand. Two good things:

The authentication procedure has been deciphered: http://www.carbonize.co.uk/ymsg16.html. It uses an HTTP call, but that's simple in C#. The only part you might struggle with is the hashing of challenge/response strings. Unfortunately there's no way to implement it in stages - it either works or it doesn't
WireShark has a dissector for YMSG that's pretty thorough. Helped me a lot.

(Note that this covers the IM portion of Yahoo YIM - I have no idea how the chat "rooms" work)

Good luck!

Eric

up vote1down vote

You can use YChatSharp. YCS is an open Yahoo Chat and Messaging Protocol (YMSG) classlibrary written in C# on .NET 4.0 with client performance and scalability as a goal. The API facilitates quick and easy implementations of Yahoo chat clients with an event-based pattern.

edited Jul 9 '12 at 15:17

answered Jul 9 '12 at 15:07