thank you all for your help i did it!

Qt Code:
  1. progress->setLabelText("Removing Package...");
  2. progress->setRange(0,0);
  3. progress->setWindowModality(Qt::WindowModal);
  4.  
  5. QProcess *removeproc = new QProcess(this);
  6. removeproc->start(RemovePkgCom);
  7. connect( removeproc, SIGNAL(finished(int,QProcess::ExitStatus)),this,SLOT(removeProcessFinished()));
  8.  
  9. progress->exec();
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