Possible: Program executing Qt3 and Qt4 code?

Question

Maybe its a very dumb question but I hope you can give me some answers.

I have a commercial application which uses Qt3 for its GUI and an embedded Python interpreter (command line) for scripting. I want to write a custom plugin for this application which uses Qt4. The plugin is mainly a subclassed QMainWindow-class that is linked into a dll (so I am on Windows) together with a boost python wrapper. The python wrapper should be the interface between my plugin and my commercial application.

So my question: is this possible?? So is running Qt3 code independent from running Qt4 code in the same application.

First experiments resulted in application shutdown, I will try to investigate this further...

Thank you!

Edit: My application crashed because I didn´t created a QT4 qapplication instance. So when I create the instance everything works well without the additional Qt namespace (which is suggested in the answers, so no need to recompile)! ;)

Answer 1

See this thread on a Trolltech forum. (Well actually that's about Qt3 plugins in a Qt4 app but I suspect the answer is much the same).

Answer 2

This might be possible by namespacing Qt. From configure --help;

-qtnamespace <name>  Wraps all Qt library code in 'namespace <name> {...}'.

Theoretically this should prevent the symbol clashes which is likely making your current approach fail.