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// 创建套接字
SOCKET sock = WSASocket(AF_INET, SOCK_STREAM, IPPOROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);
if(INVALID_SOCKET == sock)
{
printf("WSASocket call failed. Error code: %d", WSAGetLastError());
}
//
int nTimeout = 5*1000;//设置超时5秒
setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char*)&nTimeout, sizeof(nTimeout));