Call QProcess without GUI

[DeepDiver]

simply use: this

[mattia]

Do you mean in this way?

connect(&process, SIGNAL(readyReadStandardError()), this, SLOT(updateError()));

connect(&process, SIGNAL(readyReadStandardError()), this, SLOT(updateError()));

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I get this error: connect was not declered in this scope

[DeepDiver]

Try this:

QObject::connect(&process, SIGNAL(readyReadStandardError()), this, SLOT(updateError()));

QObject::connect(&process, SIGNAL(readyReadStandardError()), this, SLOT(updateError()));

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[mattia]

now i get the access at the connect function but something still wrong, i get this error:
no matching function for call to ‘QObject::connect(QProcess*, const char [26], CallApplication* const, const char [15])’

[jacek]

CallApplication doesn't inherit QObject and it lacks Q_OBJECT macro --- without this signals & slots mechanism won't work.

[mattia]

So, have i to declare the .h class in this way?

#include <QProcess>
 
      class CallApplication : public QObject
      {
       Q_OBJECT
      public:
          CallApplication();
          ~CallApplication();
          void performApplication();
      private slots:
          void updateError();
              void processFinished(int exitCode, QProcess::ExitStatus exitStatus);
              void processError(QProcess::ProcessError error); 
      public:
          QProcess process;
      };

#include <QProcess>
       
      class CallApplication : public QObject
      {
       Q_OBJECT
      public:
          CallApplication();
          ~CallApplication();
          void performApplication();
      private slots:
          void updateError();
              void processFinished(int exitCode, QProcess::ExitStatus exitStatus);
              void processError(QProcess::ProcessError error); 
      public:
          QProcess process;
      };

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[jacek]

So, have i to declare the .h class in this way?

Yes, and don't forget to re-run qmake.

[mattia]

Done! Now it's working. Thanks so much.