Qt No such slot for the QProcess::finished() signal

Question

I am trying to run a command line program, gphoto2 from my Qt app running in Linux and read the results that it outputs to Standard Output and Standard Error. The GUI in th

Answer 1

I had the same issue. I think it happens because finished signal function is overloaded with 2 signatures and the compiler has trouble to infer the type:

void finished(int exitCode); 
void finished(int exitCode, QProcess::ExitStatus exitStatus);

Here is my quick-and-dirty workaround:

1) Open qprocess.h

2) Comment the "shorter" signatures:

//  void finished(int exitCode); 

3) Then connect finished-signal with your lambda slot:

 QObject::connect(&process, &QProcess::finished, [=](int exitCode, QProcess::ExitStatus exitStatus){
       qDebug() << "finished. Exit code: " + exitCode ;
    });

Answer 2

I believe the following will work:

connect(cameraControl, SIGNAL(finished(int , QProcess::ExitStatus )), this, SLOT(on_cameraControlExit(int , QProcess::ExitStatus )));

Answer 3

Or with C++14 (modern compilers)

QObject::connect(cameraControl, qOverload<int, QProcess::ExitStatus >(&QProcess::finished), this, &MainWindow::on_cameraControlExit);

Or in the Qt5 convention:

QObject::connect(cameraControl, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), this, &MainWindow::on_cameraControlExit);