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   源码介绍

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  简单的tcp/ip协议服务端和客户端连接，文件传输

int gConnectSocket_TCP(SOCKET &_socket, char *_ipAddr, int _port, int _bufsize/*=100*1024*/, int timeout/* = 5000*/)
{
	int err;

	//创建Socket句柄
	_socket = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == _socket)
	{
		//printf("socket failed with error: %ld\n", WSAGetLastError());
		WSACleanup();
		return 1;
	}

	//设置服务器IP地址
	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr = inet_addr(_ipAddr);
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(_port);

	//resize recv buffer
	if (::setsockopt(_socket, SOL_SOCKET, SO_RCVBUF, (char*)&_bufsize, sizeof(_bufsize)))
	{
		goto error;
	}

	int StreamTimeOut = timeout;
	// set receive timeout 	
	if (::setsockopt(_socket, SOL_SOCKET, SO_RCVTIMEO, (char *)&StreamTimeOut, sizeof(StreamTimeOut)) == SOCKET_ERROR)
	{
		goto error;
	}

	//set non-blocking mode
	unsigned long ul = 1;
	err = ioctlsocket(_socket, FIONBIO, (unsigned long*)&ul);
	if (err == SOCKET_ERROR)
	{
		goto error;
	}

	//connect to camera
	int ret = connect(_socket, (const struct sockaddr *)&addrSrv, sizeof(addrSrv));
	//TRACE(L"videoSocket connect returnVal=%d",ret);
	//use select poll connection status
	struct timeval ConnectTimeOut;
	fd_set w;
	FD_ZERO(&w);
	FD_SET(_socket, &w);
	ConnectTimeOut.tv_sec = timeout / 1000;
	ConnectTimeOut.tv_usec = 0;
	err = select(0, 0, &w, 0, &ConnectTimeOut);
	if (err <= 0)
	{
		goto error;
	}

	//resume blocking mode
	unsigned long mode = 0;
	err = ioctlsocket(_socket, FIONBIO, (unsigned long*)&mode);
	if (err == SOCKET_ERROR)
	{
		goto error;
	}

	return 0;

error:

	return -2;
}