subclassing QApplication

[nupul]

I have always used a QApplication object in the main function, as is used generally. What I am a bit curious about is this: when and why should one subclass QApplication?

Thanks

Nupul

[jacek]

You must subclass QApplication when you want to change the behavior of one or more of its virtual methods.

Here's an example: http://www.qtcentre.org/forum/showth...0399#post10399

[wysota]

Or if you want to embed the whole application data into one object (for example to avoid global variables). You can then override QCoreApplication::instance() to return your "extended" pointer. And your main() can look like this then:

#include "myapplication.h"
 
int main(int argc, char **argv){
  MyApplication app(argc, argv);
  return app.exec();
}

#include "myapplication.h"

int main(int argc, char **argv){
  MyApplication app(argc, argv);
  return app.exec();
}

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