非阻塞套接字 WSAEINVAL 错误是什么导致的？

[unhappyless]

	for(;;)
	{
		//连接服务器
		reVal = connect(sClient, (const sockaddr*)&serAddr, sizeof(serAddr));
		//处理连接错误
		if(SOCKET_ERROR == reVal)
		{
			int nErrCode = WSAGetLastError();
			if(WSAEWOULDBLOCK == nErrCode ||
				WSAEINVAL == nErrCode)		//如果不加这个，下面会因为 WSAEALREADY 返回FALSE
			{
				continue;
			}else if(WSAEISCONN == nErrCode)
			{
				break;
			}else
			{
				// WSAEALREADY
				//未知原因
				return FALSE;
			}
		}

		if(0 == reVal)		//连接成功
			break;
	}

[yuyunliuhen]

没遇到过 一般就这样

  if ( connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) ) == SOCKET_ERROR) {
    printf( "Failed to connect.\n" );
    WSACleanup();
    return;
  }

UP

[yuyunliuhen]

reference MSDN

Notes for IrDA Sockets
The Af_irda.h header file must be explicitly included.
If an existing IrDA connection is detected at the media-access level, WSAENETDOWN is returned.
If active connections to a device with a different address exist, WSAEADDRINUSE is returned.
If the socket is already connected or an exclusive/multiplexed mode change failed, WSAEISCONN is returned.
If the socket was previously bound to a local service name to accept incoming connections using bind, WSAEINVAL is returned. Note that once a socket is bound, it cannot be used for establishing an outbound connection.

[unhappyless]

我想知道 WSAEINVAL 发生在什么时候？

[unhappyless]

再次发现 加不加 WSAEINVAL == nErrCode，和下面 WSAEALREADY 错误无关。
WSAEALREADY 在 debug 模式下发生概率极高，release 下没遇到

[unhappyless]

再改下，debug 下几乎100% 发生WSAEALREADY ，release 下有50%概率

这问题咋解决？

[keven1868]

Invalid argument.
Some invalid argument was supplied (for example, specifying an invalid level to the setsockopt function). In some instances, it also refers to the current state of the socket—for instance, calling accept on a socket that is not listening.

[unhappyless]

int nErrCode = WSAGetLastError();

为什么这里会发生 WSAEINVAL ？

reVal = connect(sClient, (const sockaddr*)&serAddr, sizeof(serAddr));

参数也没有不正确

[arong1234]

从名字哪里看得出你参数到底对不对？如果名字、类型都不对，就是语法错误，不是运行错误了。这里肯定某个参数值错了
BTW：对于非阻塞socket，WSAEWOULDBLOCK确实是必须检测的，这是表示“正确”的错误码，不是表示“异常”的错误码
[Quote=引用 7 楼 unhappyless 的回复:]
int nErrCode = WSAGetLastError();

为什么这里会发生 WSAEINVAL ？

reVal = connect(sClient, (const sockaddr*)&serAddr, sizeof(serAddr));

参数也没有不正确
[/Quote]