So, have i to declare the .h class in this way?
Qt Code: 
  1. #include <QProcess>
  2.  
  3.       class CallApplication : public QObject
  4.       {
  5.        Q_OBJECT
  6.       public:
  7.           CallApplication();
  8.           ~CallApplication();
  9.           void performApplication();
  10.       private slots:
  11.           void updateError();
  12.               void processFinished(int exitCode, QProcess::ExitStatus exitStatus);
  13.               void processError(QProcess::ProcessError error); 
  14.       public:
  15.           QProcess process;
  16.       };
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