Active Qt. Objects that imported from VirtualBox.tlb could not be instantiated

[minskster]

Hi Qt Funs!

I have started developing on Qt this week and second day as I stopped on binging VirtualBox COM API to Active Qt.

VirtualBoxClient is created well by non-Active Qt, classic way:

...
#include "d:\sources\algorithms\comtest2\comtest2\debug\virtualbox.tlh"
...
CLSIDFromProgID(OLESTR("VirtualBox.VirtualBoxClient"), &clsid);
    IVirtualBoxClient *virtualBoxClient = nullptr;
    hr = CoCreateInstance(clsid, nullptr, CLSCTX_INPROC_SERVER, __uuidof(IVirtualBoxClient), (void**)&virtualBoxClient);
    if (FAILED(hr) || virtualBoxClient == nullptr) {
...

...
#include "d:\sources\algorithms\comtest2\comtest2\debug\virtualbox.tlh"
...
CLSIDFromProgID(OLESTR("VirtualBox.VirtualBoxClient"), &clsid);
    IVirtualBoxClient *virtualBoxClient = nullptr;
    hr = CoCreateInstance(clsid, nullptr, CLSCTX_INPROC_SERVER, __uuidof(IVirtualBoxClient), (void**)&virtualBoxClient);
    if (FAILED(hr) || virtualBoxClient == nullptr) {
...

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But how to do it in Qt style? Step by step:
1) The following lines are added to a project file:
QT += widgets axcontainer
TYPELIBS = $$system(dumpcpp VirtualBox.tlb -n vbox )
vbox.h and vbox.cpp are generated without an error.
2) lines in main.cpp:

#include "vbox.h"
 
using namespace vbox;
 
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    vbox::VirtualBox v ;
    qDebug() << v.isNull();
    vbox::VirtualBoxClient client;
    qDebug() << client.isNull();

#include "vbox.h"

using namespace vbox;


int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    vbox::VirtualBox v ;
    qDebug() << v.isNull();
    vbox::VirtualBoxClient client;
    qDebug() << client.isNull();

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Output:
CoCreateInstance failure (CoInitialize has not been called.)
QAxBase::setControl: requested control {b1a7a4f2-47b9-4a1e-82b2-07ccd5323c3f} could not be instantiated
true
CoCreateInstance failure (CoInitialize has not been called.)
QAxBase::setControl: requested control {dd3fc71d-26c0-4fe1-bf6f-67f633265bba} could not be instantiated
true

Could you show me the right way?