初始化代码如下：
WSADATA wsd;
SOCKET sLocal, sRemote,sTmp;
struct sockaddr_in local;
char buff[16];
if(WSAStartup(MAKEWORD(2, 2), &wsd) != 0){
AfxMessageBox("WSAStartup() failed!");
return 0;
}
sLocal = socket(AF_INET, SOCK_DGRAM, 0);
if(sLocal == SOCKET_ERROR){
AfxMessageBox("socket() failed!");
closesocket(sLocal);
WSACleanup();
}
local.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
local.sin_family=AF_INET;
local.sin_port=htons(2222);
int ret=bind(sLocal,(struct sockaddr *)&local,sizeof(local));
if(ret==SOCKET_ERROR){
AfxMessageBox("bind() failed!");
closesocket(sLocal);
WSACleanup();
return 0;
};
