Maverick/Developers FAQ

Not a valid Qt Plugin

• Main reasons
  • Compile the plugin (and all the dependent DLLs ) in Release mode as QDesigner is run in release
  • Copy the created plugin dll into a directory QDesigner knows about (by default: %QTDIR%/plugins/designer, but you can set QT_PLUGIN_PATH instead
  • Make sure QDesigner has access to all the dependant DLLs (by setting the PATH), you can use the freeware DependencyWalker to know which DLL the plugin needs
  • if QtDesigner crashes when loading your ui form, then make sure all your dlls (and paths) are in release (the best way to do it is to recompile in Release mode

• Consult the following guide
  • "One hundred reasons my Qt plugin is not working" by David Garcia Garzon
  • http://www.iua.upf.edu/~dgarcia/Codders/qtpluginnotloading.html

Why my module is not working

• The Application logic is missing ?

myApplicationLogic = vtkSlicerApplicationLogic::New();
myApplicationLogic->SetMRMLScene( myVTKMRMLScene );
myApplicationLogic->ProcessMRMLEvents( myVTKMRMLScene, vtkCommand::ModifiedEvent, NULL);  
myApplicationLogic->SetAndObserveMRMLScene ( myVTKMRMLScene );
myApplicationLogic->CreateProcessingThread();

• • The application logic can be used by all the modules in your application:

...
myModule->ReceiveApplicationLogic(myApplicationLogic);
...
mySecondModule->ReceiveApplicationLogic(myApplicationLogic);
...
myThirdModule->ReceiveApplicationLogic(myApplicationLogic);
...

• The module is running but never "quit" ?
  • A timer should be used to check the status of your module. In QT:

QTimer* timer = new QTimer(this);
timer->setInterval(100); //ms 
QObject::connect(timer, SIGNAL(timeout()), this,SLOT( CheckTimeouts()));
timer->start();

void MyApplication::CheckTimeouts()
{
  vtkPulseGenerator::CheckTimeouts();
}