UDP Port needs to be bound to receive?...

[Incubbus]

Hey...

I am staritng winsock and creating a udp socket the usual way and anythig is finde (sendto works fine, too)...


But when trying to recvfrom(), I get the WSAEINVAL (10022) error and don´t know why...

I checked my parameters and they are passed correctly...

Inc::STATS CConnection::_RecvData(sockaddr* addr, std::string &strData)
{
	int ret, len, fromlen;		//return code / length of the data / sizeof(sockaddr)
	char *buffer;		//will hold the data
	char c;

	//recv length of the message
	fromlen = sizeof(sockaddr);
	ret = recvfrom(m_InSock, &c, 1, 0, addr, &fromlen);
	if(ret != 1)
	{...

m_InSock is the created socket,
fromlen should work, too,
c, too,
and addr is passed ( it is alive and not destroyed due to some block/-scope stuff...


So I am wondering, because the WSAEINVAL can also mean, that You need to bind a socket...
But that would be lame on the client -.-'...

Any suggestions/clues/etc?...

[kbw]

The error means you have specified a bad parameter.

A UDP client doesn't need to call bind.

[Incubbus]

I read on the remarks section again and found out, that a call to sendto binds the socket implicitly...

So i have to call bind before recvfrom always to ensure the linkage between the

W_Young wrote:

stack and the program

.

I guess, I will bind the socket to 0, to ensure a random port...