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