A tcp and UPD chat and file transfer program

 

Abstract:

This article uses examples to show how to chat, send files to each other, and capture the screen of the recipient to save as a file in the LAN. The program also includes obtaining the IP address and computer name of the Local Machine and the other party. Provides functions such as The ListBox control.

The running interface is as follows:



1. Start and terminate the listening thread (only about TCP)

This program can be switched instantly, so it is necessary to end the thread that is still in the accept state.
// TCP listening thread

UINT _ ListenTcpThread (LPVOID lparam)
  

{
  

CMyQQDlg * pDlg = (CMyQQDlg *) lparam;
  

CSocket sockSrvr;
  

PDlg-> m_Potr = PORT + pDlg-> m_server; // Save the current PORT used for disabling
  

Int createSucceed = sockSrvr. Create (pDlg-> m_Potr );
  

Int listenSucceed = sockSrvr. Listen ();// Start listening
  

CSocket recSo;
  

SOCKADDR_IN client;
  

Int iAddrSize = sizeof (client );
  

Int acceptSucceed = sockSrvr. Accept (recSo, (SOCKADDR *) & client, & iAddrSize );// Accept the connection and obtain the IP address of the other party
  

SockSrvr. Close ();
  

Char flag [FLAG] = {0 };// Acceptance mark, used to determine whether information and files are accepted
  

If (recSo. Receive (flag, FLAG )! = 2)
  

{
  

Return-1;
  

}
  

PDlg-> m_type = flag [0];
  

If (pDlg-> m_type = D) return 0; // terminate this thread
  

PThreadLisen =: AfxBeginThread (_ ListenTcpThread, pDlg );
  

PDlg-> ReceiveFileMsg (recSo, client );
  

Return 0;
  

}
  

Close

If (m_nSockType = SOCK_TCP)
  

{
  

DWORDDwStatus;