After a couple of nights of hacking I figured out how to run QT from Free Pascal. I was just doing a test of something I had mentioned earlier. I am glad I did this little trial run I found out one hell of alot about the g++ compiler, ld, and the Free Pascal Compiler.

Cliff

I think the simplest way (but a lot of work!) to use Qt is writing C wrappers to the method calls like:

...
extern "C" {

void QObject_Method(QObject *this,int param1)
{

   this->Method(param1);

}
}

Or did you collect some knowledge about VMTs etc and simulate that using records of proc. vars?

Because our idea is to create a new class type cppclass:

type
   QObject = cppclass
      procedure Method;cppdecl;external:
      ...
   end;

to support cppclasses but for that we need some information how C++ classes work, the main is the vmt which is even different between egcs and old gcc

Here is the way that I am approaching it.

in CPP

extern "C" IntSendMessage(int Message,int WindgetID, void Data, int DataLength )

in Pascal

const
MSG_CREATE_APPLICATION = 0;
MSG_CREATE_FORM = 1;
begin
  IntSendMessage(MSG_CREATE_APPLICATION, nil,nil,nil )
  intMessageHook(@ Winproc)
  intSendMessage(MSG_CREATE_FORM,Form.ID,Form.Rect, SizeRect);
end.

Those are the only two calls declared external in a shared library. Every thing is done thru that single common interface.

Cliff