inet_pton 443: error: 'inet_pton' was not declared in this scope

Imran Hassan

@jsulm said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

Is this the only error you get, or is there an error that ws2tcpip.h could not be found?

I am getting only this error. It is not giving any error related to the library and header file.

This is the full error I am getting
Full error is Sementic Issue 443:9 C:\Users\IMRANHASSAN\Documents\VideoCodecApp\mainwindow.cpp:443: error: 'inet_pton' was not declared in this scope inet_pton(AF_INET, "192.168.6.166", destAddr); ^~~~~~~~~

jsulm

@Imran-Hassan You did not answer this question: "Are these includes in the same file where you call inet_pton?"

Christian Ehrlicher

And please try to move the winapi includes before the Qt includes to see if it helps.
Also try to create a simple main.cpp where you only call inet_pton() to see if it works there.

Imran Hassan

@jsulm said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

"Are these includes in the same file where you call inet_pton?"

Yes these are included in the same file. I checked it by both including in a header file and include that header file

Also just including the header files in same file both give the same error

Imran Hassan

@jsulm said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

Is this the only error you get, or is there an error that ws2tcpip.h could not be found?

Some time it also give this error

C:\Users\IMRANHASSAN\Documents\VideoCodecApp\mainwindow.cpp:450: error: use of undeclared identifier 'inet_pton'

Imran Hassan

@Christian-Ehrlicher said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

And please try to move the winapi includes before the Qt includes to see if it helps.

I tried this but same problem

Also try to create a simple main.cpp where you only call inet_pton() to see if it works there.

I made simple application

#include "mainwindow.h"
#include "ui_mainwindow.h"



//#include <winsock2.h>
//#include <winsock.h>
#include <ws2tcpip.h>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    PVOID* destAddr = new PVOID;
//    sockaddr_storage storage;
    inet_pton(AF_INET, "192.168.6.166", destAddr);
}

MainWindow::~MainWindow()
{
    delete ui;
}

.pro file is as

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17
LIBS += -lws2_32

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

But the error is same

jsulm

@Imran-Hassan You did not really do what @Christian-Ehrlicher suggested...

Christian Ehrlicher

And why do you not use QtNetwork for it?

Imran Hassan

@jsulm said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

You did not really do what @Christian-Ehrlicher suggested...

I created a simple application with GUI and I also created simple console application. But in both I get same error

Christian Ehrlicher

@Imran-Hassan said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

and I also created simple console application.

Please show the code

Imran Hassan

@Christian-Ehrlicher said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

Please show the code

Here is code

#include <ws2tcpip.h>
#include <QCoreApplication>
#include <QtNetwork>



int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    PVOID* destAddr = new PVOID;
//    sockaddr_storage storage;
    inet_pton(AF_INET, "192.168.6.166", destAddr);
    return a.exec();
}

Pro file is

LIBS += -lws2_32
QT -= gui
QT += network
CONFIG += c++11 console
CONFIG -= app_bundle


DEFINES += QT_DEPRECATED_WARNINGS


SOURCES += \
        main.cpp

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

Christian Ehrlicher

Ok, so according to the docs you must define _WIN32_WINNT to 0x0600 or higher:

Minimum supported client 	Windows 8.1, Windows Vista [desktop apps | UWP apps]

I still would suggest you to simply use QtNetwork for this instead some low-level api calls.

Imran Hassan

@Christian-Ehrlicher said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

according to the docs you must define _WIN32_WINNT to 0x0600 or higher

I have used #define _WIN32_WINNT_WIN10 0x0A00 // Windows 10

I still would suggest you to simply use QtNetwork for this instead some low-level api calls.

What is the alternative of inet_pton in QtNetwork?

Christian Ehrlicher

@Imran-Hassan said in inet_pton 443: error: 'inet_pton' was not declared in this scope:

I have used #define _WIN32_WINNT_WIN10 0x0A00 // Windows 10

And what should this help? Please read my post

What is the alternative of inet_pton in QtNetwork?

"192.168.6.166" is a host address... https://doc.qt.io/qt-5/qhostaddress.html

Imran Hassan

@Christian-Ehrlicher Thanks dear. I will use this