更改为win下跨平台的程序

#include <winsock2.h>

void init_winsock()

{

    WORD wVersionRequested;

    WSADATA wsaData;

    int err;

    wVersionRequested = MAKEWORD(2,2);

    err = WSAStartup( wVersionRequested, &wsaData );

    if ( err != 0 ) {   

        return;

    }

    if ( LOBYTE( wsaData.wVersion ) != 2 ||

         HIBYTE( wsaData.wVersion ) != 2 ) {

        WSACleanup();

        return;

    }

}

CmakeLists.txt  添加 link_libraries(-lws2_32)

-------------------------

WSADATA wsaData;

if (WSAStartup(MAKEWORD(1,1), &wsaData))
return 0;