Compilation Error

[Atomic_Sheep]

Hi Guys, I'm trying to compile this code:

#include <QtCore/QCoreApplication>
#include <winsock2.h>
#include <stdio.h>
 
// #include <netinet/in.h>
// #include <arpa.inet.h>
 
int main(int argc, char *argv[])
{
    struct sockaddr_in peer; //"struct sockaddr_in" is a structure type and "peer" is a name of the variable. The "struct" word comes from C and it is not needed in C++
    int s;
    int rc;
    char buf[1];
 
    peer.sin_family = AF_INET;
    peer.sin_port = htons(7500);
    peer.sin_addr.s_addr = inet_addr("127.0.0.1");
 
    s = socket(AF_INET, SOCK_STREAM, 0);
 
    if(s < 0)
    {
        perror("socket call failed");
        exit(0);
    }
 
    rc = connect(s, (struct sockaddr *)&peer, sizeof(peer));
 
    if(rc)
    {
        perror("connect call failed");
        exit(1);
    }
 
    rc = send(s, "1", 1, 0);
 
    if(rc <= 0)
    {
        perror("send call failed");
        exit(1);
    }
 
    rc = recv(s, buf, 1, 0);
    if(rc <= 0)
        perror("recv call failed");
    else
        printf("%c\n", buf[0]);
    exit(0);
 
    QCoreApplication a(argc, argv);
 
    return a.exec();
}

#include <QtCore/QCoreApplication>
#include <winsock2.h>
#include <stdio.h>

// #include <netinet/in.h>
// #include <arpa.inet.h>

int main(int argc, char *argv[])
{
    struct sockaddr_in peer; //"struct sockaddr_in" is a structure type and "peer" is a name of the variable. The "struct" word comes from C and it is not needed in C++
    int s;
    int rc;
    char buf[1];

    peer.sin_family = AF_INET;
    peer.sin_port = htons(7500);
    peer.sin_addr.s_addr = inet_addr("127.0.0.1");

    s = socket(AF_INET, SOCK_STREAM, 0);

    if(s < 0)
    {
        perror("socket call failed");
        exit(0);
    }

    rc = connect(s, (struct sockaddr *)&peer, sizeof(peer));

    if(rc)
    {
        perror("connect call failed");
        exit(1);
    }

    rc = send(s, "1", 1, 0);

    if(rc <= 0)
    {
        perror("send call failed");
        exit(1);
    }

    rc = recv(s, buf, 1, 0);
    if(rc <= 0)
        perror("recv call failed");
    else
        printf("%c\n", buf[0]);
    exit(0);

    QCoreApplication a(argc, argv);

    return a.exec();
}

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But I get undefined reference errors for all the functions like htons, inet_addr etc basically all the functions which are part of Ws2_32.lib with the header Winsock2.h as per:

https://msdn.microsoft.com/en-us/lib...(v=vs.85).aspx

Here is my .pro file:

#-------------------------------------------------
#
# Project created by QtCreator 2015-10-08T12:19:26
#
#-------------------------------------------------
 
QT       += core
 
QT       -= gui
 
TARGET = TCP_IPClient
CONFIG   += console
CONFIG   -= app_bundle
 
TEMPLATE = app
 
 
SOURCES += main.cpp

#-------------------------------------------------
#
# Project created by QtCreator 2015-10-08T12:19:26
#
#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = TCP_IPClient
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp

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According to stack overflow:

"you can get 'Undefined reference' linker errors when attempting to compile C code with g++, if you don't tell the compiler to use C linkage."

I'm guessing that this is my problem, so how do I tell the compiler to use C linkage?

[Atomic_Sheep]

I think I'm slowly figuring out what needs to be done, I think I need to find the Ws2_32.lib somewhere and add it in my .pro file, will update if this works.

---

Added after 1 19 minutes:

Yep installed the microsft SDK and linked through .pro file, all is working now .

As a side note, you need to uninstall the redistributable 2010 files prior to installation, otherwise you can't install the SDK.

Here is a link to the explanation:

https://wiki.qt.io/Cannot_Install_Windows_SDK