I was answering the general request, not so much a specific post. Everything I know about ActiveQt as a COM client comes from the docs in Assistant, specifically http://doc.trolltech.com/4.6/activeqt-container.html and also the Qutlook example.

Have you tried a minimal example? Something like:

trial.pro
Qt Code: 
  1. TEMPLATE = app
  2. TARGET = trial
  3. CONFIG += qaxcontainer
  4. TYPELIBS = Disto2.tlb 
  5. SOURCES += main.cpp
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main.cpp:
Qt Code: 
  1. #include "disto.h"   // <<<<< adjust this to suit the file name generated by dumpcpp
  2. #include <QApplication>
  3. #include <QDebug>
  4.  
  5. int main(int argc, char ** argv)
  6. {
  7.     QApplication a(argc, argv);
  8.  
  9.     Disto2::Disto disto;
  10.     qDebug() << disto.DistoVersion();   //  I am assuming this returns QString or an int
  11.  
  12.     return a.exec();
  13. }
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