Quote Originally Posted by Yes View Post
. . . but now I wanted to use the stateChanged signal. . . .
Then connecting both signals should work:
Qt Code: 
  1. process_handler::process_handler(QObject *parent) :
  2.     QObject(parent)
  3. {
  4.     connect(&p, SIGNAL(stateChanged(QProcess::ProcessState)), this, SLOT(process_state_changed(QProcess::ProcessState)));
  5.     connect(&p, SIGNAL(finished()), this, SLOT(start_process()));
  6. }
  7.  
  8. void process_handler::process_state_changed(QProcess::ProcessState state)
  9. {
  10.     if (state == QProcess::Starting) {
  11.         cout << endl;
  12.         cout << "Process is starting up..." << endl;
  13.     }
  14.     if (state == QProcess::Running) {
  15.         cout << "Process is now running." << endl;
  16.     }
  17.     if (state == QProcess::NotRunning) {
  18.         cout << "Process is finished running." << endl;
  19.  
  20.         /* Start a new process */
  21. //        start_process();
  22.         //QTimer::singleShot(0, this, SLOT(start_process()));
  23.     }
  24. }
  25.  
  26. . . .
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