編寫服務端可能會遇到的第一個問題

編寫服務端代碼如下：

#include <stdio.h>
#include <WinSock2.h>

void main()
{
 WORD wVersionRequested;
 WSADATA wsaData;
 int err;
 
 wVersionRequested = MAKEWORD( 2, 2 ); 
 err = WSAStartup( wVersionRequested, &wsaData );
 if ( err != 0 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  return;
 }
 
 /* Confirm that the WinSock DLL supports 2.2.*/
 /* Note that if the DLL supports versions greater    */
 /* than 2.2 in addition to 2.2, it will still return */
 /* 2.2 in wVersion since that is the version we      */
 /* requested.                                        */
 
 if ( LOBYTE( wsaData.wVersion ) != 2 ||
   HIBYTE( wsaData.wVersion ) != 2 ) {
  /* Tell the user that we could not find a usable */
  /* WinSock DLL.                                  */
  WSACleanup( );
  return;
 }
 
 /* The WinSock DLL is acceptable. Proceed. */

}

 

運行結果，報錯如下：

1>------ Rebuild All started: Project: TCPSrv, Configuration: Debug Win32 ------
1>Deleting intermediate and output files for project 'TCPSrv', configuration 'Debug|Win32'
1>Compiling...
1>TcpSrv.cpp
1>Compiling manifest to resources...
1>Linking...
1>TcpSrv.obj : error LNK2019: unresolved external symbol __imp__WSACleanup@0 referenced in function _main
1>TcpSrv.obj : error LNK2019: unresolved external symbol __imp__WSAStartup@8 referenced in function _main
1>D:/Win32Project/TCPSrv/Debug/TCPSrv.exe : fatal error LNK1120: 2 unresolved externals
1>Build log was saved at "file://d:/Win32Project/TCPSrv/Debug/BuildLog.htm"
1>TCPSrv - 3 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

 

解決方案：

在源檔案裡加   #pragma comment(lib, "Ws2_32.lib")