Thread: Winsock error 10049

Dear programmers,

i'm trying to make a internet connection in a C program using Winsock. I found a great tut (Programming Windows TCP Sockets in C++ for the Beginner - CodeProject) but everything did not work as aspected. I have a winsock error n.o. 10049. When I search for this i see this : "The requested address is not valid in its context."
(source:

when I try to set up a loopback connection it gives no errors, but doesn't work either: he always think that there is a connectioncall (other words: the program doesn't "hang"). What am I doing wrong?

here is the server code:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <winsock.h>
int ListenOnPort(int portno);
int main()
{
    int errorcode=0;
    printf("Hello world!\n");
   // while(1)
        errorcode=ListenOnPort(6221);
    printf("errorcode is %d", errorcode);
    return 0;
}

//LISTENONPORT – Listens on a specified port for incoming connections
//or data
int ListenOnPort(int portno)
{
    SOCKET s;
    WSADATA w;
    int error = WSAStartup (0x0202, &w);   // Fill in WSA info

    if (error)
    {
        return 50; //For some reason we couldn't start Winsock
    }

    if (w.wVersion != 0x0202) //Wrong Winsock version?
    {
        WSACleanup ();
        return 51;
    }

    SOCKADDR_IN addr; // The address structure for a TCP socket

    addr.sin_family = AF_INET;      // Address family
    addr.sin_port = htons (portno);   // Assign port to this socket

    //Accept a connection from any IP using INADDR_ANY
    //You could pass inet_addr("0.0.0.0") instead to accomplish the
    //same thing. If you want only to watch for a connection from a
    //specific IP, specify that //instead.
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP); // Create socket

    if (s == INVALID_SOCKET)
        {
        return 52; //Don't continue if we couldn't create a //socket!!
        }
    if (bind(s, (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR)
        {
        wprintf(L"bind failed with error %u\n", WSAGetLastError());
        closesocket(s);
        WSACleanup();
       //We couldn't bind (this will happen if you try to bind to the same
       //socket more than once)
        return 53;
        }

    //Now we can start listening (allowing as many connections as possible to
    //be made at the same time using SOMAXCONN). You could specify any
    //integer value equal to or lesser than SOMAXCONN instead for custom
    //purposes). The function will not //return until a connection request is
    //made
    listen(s, SOMAXCONN);
    printf("Done\n");

    //Don't forget to clean up with CloseConnection()!
}

kind regards,

Libpgeak

EDIT: when I change the IPaddres to 192.168.0.28 I get this error.

There are no firewall errors / blocks. The weird thing is 127.0.0.1 gives a direct "done" message, but there is no client running...

Thanks Niara, the accept was the trick =]