window的socket编程设置connect连接超时

timeval tm;
fd_set set;
int error = -1;
int iReceTimeOut = 2000;
int len = sizeof(int);

SOCKET hSocket 

1.生成socket

hSocket = socket(AF_INET, SOCK_STREAM, 0);

2.设置套接字为非阻塞模式

unsigned long ul = 1;

ioctlsocket(hSocket , FIONBIO, &ul); //设置为非阻塞模式

3.开始连接目标地

        if (INVALID_SOCKET != hSocket) 
	{
		return false;
	}
	hSocket = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == hSocket) 
	{
		return false;
	}

	unsigned long ul = 1;
	timeval tm;
	fd_set set;
	int error = -1;
	int iReceTimeOut = 2000;
	int len = sizeof(int);

	SOCKADDR_IN SocketAddr;
	memset(&SocketAddr,0,sizeof(SOCKADDR_IN));
	SocketAddr.sin_addr.s_addr = inet_addr(pServerIp);
	SocketAddr.sin_port = htons(iPort);
	SocketAddr.sin_family = AF_INET;


	ioctlsocket(hSocket, FIONBIO, &ul); //设置为非阻塞模式
	if (SOCKET_ERROR == connect(hSocket, (SOCKADDR *)&SocketAddr, sizeof(SOCKADDR_IN)))
	{
		//连接sock5服务器失败
		tm.tv_sec  = 2;
		tm.tv_usec = 0;
		FD_ZERO(&set);
		FD_SET(hSocket, &set);
		if( select(hSocket, NULL, &set, NULL, &tm) <= 0)
		{
			closesocket(hSocket);
			hSocket = INVALID_SOCKET;
			return false;
		} 
		getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char *)&error, /*(socklen_t *)*/&len);
		if (error != 0)
		{
			closesocket(hSocket);
			hSocket = INVALID_SOCKET;
			return false;
		}
	}

	ul = 0;
	ioctlsocket(hSocket, FIONBIO, &ul); //设置为阻塞模式

	setsockopt( hSocket, SOL_SOCKET, SO_RCVTIMEO, ( char * )&iReceTimeOut, sizeof( int ) );        

　　

4.最后结束后将套接字再次设置为阻塞模式

ul = 0;
ioctlsocket(hSocket , FIONBIO, &ul); //设置为阻塞模式

5.如果想设置接受超时

setsockopt( hSocket , SOL_SOCKET, SO_RCVTIMEO, ( char * )&iReceTimeOut, sizeof( int ) );