Using COM object with MinGW 4.8

[gkavrecic]

Hi
I'm trying to use an external COM object with MinGW 4.8.

I used dumpcpp to generate *.h & *.cpp file.
But it returns an empty result when I want to get the *.tlb file.
I've tried with GUID & EXE name.

The *.pro file contains:
TYPELIBS = $$system(dumpcpp.exe --getfile "ext_prog.exe")
isEmpty(TYPELIBS){
message("Component is not found!")
REQUIRES += Component
}

The compiler returns:
"Some of the required modules (Component) are not available."
"Skipped."

Any advice?

[karlheinzreichel]

you have to pull all of the necessary dlls of ext_prog.exe in your path, (e.g. the Qt libraries)
as dumpcpp will try to execute the ext_prog.exe during the generation of the tlb file.

regards
Karl-Heinz

[gkavrecic]

I find it strange that dumpcpp does not report any error.
neither it generates any output

[gkavrecic]

I've also tried to run dumpcpp in the install folder of the program.
The program is not a secret, just wanted to make it generic.
It is Zoiper.

[gkavrecic]

I 've made a step forward using a different GUID.
It actually returned the Zoiper.EXE itself.

Now, I'm stuck compiling QAxObject descendants - e.g. IZoiperScript class (the first in *.h file)

zoiperapi.h:281: error: no matching function for call to 'QAxObject::QAxObject(ZoiperAPI::IUnknown*, QAxObject*&)'

from zoiperapi.h:

class ZOIPERAPI_EXPORT IZoiperScript : public QAxObject
{
public:
    IZoiperScript(IDispatch *subobject = 0, QAxObject *parent = 0)
        : QAxObject((IUnknown*)subobject, parent)
    {
        internalRelease();
    }
...
}

QAxObject is defined as:

class QAxObject : public QObject, public QAxBase
{
    QAxObject(QObject *parent = 0);
    QAxObject(const QString &c, QObject *parent = 0);
    QAxObject(IUnknown *iface, QObject *parent = 0);
...
}

As QAxObject is a descendant of QObject this should not be a problem. Or miss something?

It might that the problem is caused because I've used dumpcpp from Qt 5.9? (I'm compiling with 4.8)

[gkavrecic]

I've tried compiling with Qt 5.9, but it returns the same error.

Additionally, I had to modify the generated zoiperapi.h file:

from:

#include <qaxobject.h>
#include <qaxwidget.h>

to:

#include <ActiveQt/QAxBase>
#include <ActiveQt/QAxObject>

But it still complains about the QAxObject constructor