Connect signal to signal

[mandruk1331]

As the title says I want to connect signal to a signal but the compiler gives me this error:

error: no matching function for call to '_Camera::connect(MarkFrame*&, const char*, _Camera*, const char*)'
      QObject::connect(markFrame,SIGNAL(logM(QString)),this,SIGNAL(Log(QString)));

_Camera::_Camera(QString camera_name){
     this->camera_name = camera_name;
     markFrame = new MarkFrame;
     connect(&socket,SIGNAL(bytesWritten(qint64)),this,SLOT(bytesWrittenC(qint64)));
     QObject::connect(markFrame,SIGNAL(logM(QString)),this,SIGNAL(Log(QString)));
 }

What could be the problem?

[mrjj]

Is
Log(QString)
placed in the signal section ?
Also clean build folder and re-run qmake and then rebuild all just to be sure.

[ambershark]

@mandruk1331 To add to @mrjj is MarkFrame derived from QOjbect and contains the Q_OBJECT macro?

[Venkatesh V]

@mandruk1331

First you make sure that both the source and destination objects are derived from QObject and as @ambershark said, add Q_OBJECT macro and in connect statement QObject:: is not required because you are already in QObject context only.
If you go through all the above cases, it should works.

[J.Hilk]

@mandruk1331 Iirc the old syntax does not support signal to signal connections, you should use the new one, that way it works for sure.

connect(markFrame,&MarkFrame::logM ,this,&_Camera::Log);

[mrjj]

@J.Hilk
old syntax does do signal to signal or i really have a vivid imagination as i use
signal to signal to interface to widgets from dialogs. :)

[J.Hilk]

@mrjj I just reread the docs and turns out my memory is treasonous thing these last few days...

[mrjj]

@J.Hilk
Its due to summer. Brain thinks on other types on 'connections' ;)