Invalid socket

[wberoli]

I am writing a code to connect to a socket.
But when I use the function MySocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); it always returns invalid socket.
I don´t know why this happens.

Any light would be very appreciated.

Thanks

[S_M_A]

Try the example here http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx (also read the text carefully)
If that works you do something wrong, maybe not calling WSAStartup?

[wberoli]

Try the example here http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx (also read the text carefully)
If that works you do something wrong, maybe not calling WSAStartup?

I´m doing:

SOCKET sock;
sock = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

if(sock == INVALID_SOCKET)
return -1;

SOCKADDR_IN serveraddr;
memset(&serveraddr,0, sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(3000);
serveraddr.sin_addr.s_addr = IpAddr.val;
if (connect(sock, (SOCKADDR*)&serveraddr, sizeof(SOCKADDR_IN)) < 0) {
closesocket( sock );
}

I have did this before in another program and worked fine, but now it doesn´t work.
What can be wrong ?

I´m not using WSAStartup...

[Skizmo]

What can be wrong ?

I´m not using WSAStartup...

You just answered your own question.

MSDN:

The WSAStartup function initiates use of the Winsock DLL by a process.

Without the WSAStartup, there are no sockets.

[wberoli]

You just answered your own question.

MSDN:

Without the WSAStartup, there are no sockets.

Ok. I got it.
I´m newbie in sokets world.
Thanks guys. Problem solved.

[VictorN]

Ok. I got it.
I´m newbie in sokets world.
Thanks guys. Problem solved.

Note that you must call WSAGetLastError (or GetLastError) every time your socket function fails (or is about to fail). Otherwise it won't be possible to know the reason of the failure.

[wberoli]

Note that you must call WSAGetLastError (or GetLastError) every time your socket function fails (or is about to fail). Otherwise it won't be possible to know the reason of the failure.

Thanks for the advice Victor.
I´m steping up the learning curve.