Connecting to OCX COM object : QAxBase::qt_metacall: Object is not initialized, or initialization failed

[SAJMED]

Hi, I have the same problem described in this page but the answer given there doesn't solve my problem because I alredy use QApplication.

"ocx1lib.h" is given using dumpcpp.exe as the page above.

My code is :

#include "mainwindow.h"
#include "ocx1lib.h"
#include <QApplication>
#include <QDebug>
#include "combaseapi.h"

using namespace OCX1Lib;
int main(int argc, char *argv[])
{
    _DDctl * readObj = new _DDctl();
    //qDebug() << readObj->setControl("{22842328-3FCE-11D1-9B93-0020AF524FA5}");
    readObj->SetLinkTopic("ncdde|ncu840d");

    //QApplication a(argc, argv);
    //MainWindow w;
    //w.show();
    //return a.exec();

    return 0;
}```

[KroMignon]

@SAJMED Hello and welcome to Qt Forum.
What page and problem are you talking about?

I don't understand what you want to do and what is not working as expected.

[SAJMED]

Sorry for the delay I can only post once every 600 second(s), I forget to add the link

https://forum.qt.io/topic/69584/connecting-to-com-object-requested-control-could-not-be-instantiated

and the error I'm having is this while executing the code above :
QAxBase::qt_metacall: Object is not initialized, or initialization failed

[KroMignon]

@SAJMED said in Connecting to OCX COM object : QAxBase::qt_metacall: Object is not initialized, or initialization failed:

and the error I'm having is this while executing the code above :
QAxBase::qt_metacall: Object is not initialized, or initialization failed

Initializing QApplication must be done before using any QObject based classe.
I think your code should be:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    
    _DDctl * readObj = new _DDctl();
    readObj->SetLinkTopic("ncdde|ncu840d");
    //qDebug() << readObj->setControl("{22842328-3FCE-11D1-9B93-0020AF524FA5}");

    //MainWindow w;
    //w.show();
    //return a.exec();
    return 0;
}

[SAJMED]

Thank you @KroMignon for you help, It doesn't solve the problem.

[KroMignon]

@SAJMED said in Connecting to OCX COM object : QAxBase::qt_metacall: Object is not initialized, or initialization failed:

It doesn't solve the problem.

Perhaps calling setControl() has to be done, why to do you comment it out?

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    
    _DDctl * readObj = new _DDctl();
    qDebug() << readObj->setControl("{22842328-3FCE-11D1-9B93-0020AF524FA5}");
    readObj->SetLinkTopic("ncdde|ncu840d");

    //MainWindow w;
    //w.show();
    //return a.exec();
    return 0;
}

I have never use ActiveQt, maybe there is another forum user which may help you.

[SAJMED]

when I call setControl()
I have this error :

CoCreateInstance failure (Classe non enregistrée)
QAxBase::setControl: requested control {22842328-3FCE-11D1-9B93-0020AF524FA5} could not be instantiated
QAxBase::qt_metacall: Object is not initialized, or initialization failed

[hskoglund]

H, perhaps you've forgotten the register the .ocx file? You do it with the regsvr32.exe command in a CMD window.