加载windows socket

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C中要使用socket ，必须先要加载套接字（socket ）------在VC++编译环境

在连接选项里的库文件中，添上ws2_32.lib

#include <winsock2.h> //也可以选择1.1版本，winsock.h

void preSocket( )

{

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 later    */
/* 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;
}

说明： WSAStartup和WSACleanup是成对出现的，分别在使用socket的前后，一个是加载套接字库，一个是退出套接字库。