CODEWITHSUNDEEP
c++winapiwinsock2
Mr X
Mr X

Reputation: 354

connect function Error 10047 (winsock2)

So I copied some test code from the MSDN site that uses basic windows socket functions. Here is the code:

#include "stdafx.h"

#ifndef UNICODE
#define UNICODE
#endif

#include <stdio.h>
#include <winsock2.h>
#include <ws2tcipip.h>
#include <wchar.h>


int main()
{

    int iResult = 0;

    //----------------------
    // Initialize Winsock
    WSADATA wsaData;
    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        wprintf(L"WSAStartup function failed with error: %d\n", iResult);
        return 1;
    }
    //----------------------
    // Create a SOCKET for connecting to server
    SOCKET ConnectSocket;
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        wprintf(L"socket function failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }
    //----------------------
    // The sockaddr_in structure specifies the address family,
    // IP address, and port of the server to be connected to.

    int I = sizeof(sockaddr_in);
        sockaddr_in clientService;
    clientService.sin_family = AF_INET;     
        clientService.sin_port = htons(5000);
    in_addr *s = (in_addr*)malloc(sizeof(in_addr));
    s->s_addr = inet_addr("127.0.0.1");
    clientService.sin_addr = (in_addr_t)s;

    iResult = connect(ConnectSocket, (sockaddr*)&clientService,I);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"connect function failed with error: %ld\n", WSAGetLastError());
        iResult = closesocket(ConnectSocket);
        if (iResult == SOCKET_ERROR)
            wprintf(L"closesocket function failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    wprintf(L"Connected to server.\n");

    iResult = closesocket(ConnectSocket);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"closesocket function failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    WSACleanup();
    return 0;
}

The code compiles just fine. But when I run the program the command prompt screen displays the following error message:

connection failed with error: 10047

Now I know that Error 10047 indicates an error in the address structure. I tried using inet_pton but that leads to a segment error (memory access violation) as inet_pton uses the memcpy function. So what is going on here? Is the connect function improperly implemented? Maybe there is another way to specify the address structure.

Upvotes: 2

Views: 7330

Answers (2)

HerrJoebob
HerrJoebob

Reputation: 2313

In your case the problem is this line here:

clientService.sin_addr = (in_addr_t)s;

You're assigning an in_addr pointer to an in_addr object. Dereference the pointer like so (also note that if you remove the cast the compiler will catch the problem:

clientService.sin_addr = *s;

LastCoder's approach would be easier, though. There's no reason to malloc() a separate in_addr structure just to copy it.

Upvotes: 0

Louis Ricci
Louis Ricci

Reputation: 21106

From MSDN: http://msdn.microsoft.com/en-us/library/windows/desktop/ms737625%28v=vs.85%29.aspx

sockaddr_in clientService;
clientService.sin_family = AF_INET;
clientService.sin_addr.s_addr = inet_addr("127.0.0.1");
clientService.sin_port = htons(27015);

Seems like your setting .sin_addr.s_addr in an ambiguous way.

If it turns out the above, isn't the problem, then perhaps you have IP6 protocols truned on but no IP4 which would be why AF_NET is failing and required AF_NET6.

Upvotes: 1

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