Here is what I need to do?  I need top pass a pointer to the
MyProgressNotifier class to an unmanaged function.  So the
MyProgressNotifier class cannot be managed.  The NotifyTotal function
will be called from the mentioned unmanaged function.

class MyProgressNotifier : public GarXface4::ProgressNotifier
{

public:

    MyProgressNotifier() :ProgressNotifier()
    {

    }   

    void NotifyTotal(int nTotal)
    {   
        ProgressNotifier::NotifyTotal(nTotal);
        // Fire managed event here
       
    }

};

I have no idea Bruce.  Though I don't code for a living, I would not
even mix unmanaged with managed code.  Just start from a Tabula Rasa.

But do check something as fundamental as you are compiling with the
/clr option rather than /clr:safe option.

RL

gcroot<mngd_class*>

I have examples for both ways:

http://tweakbits.com/ManagedToUnmanagedCallback.cpp
http://tweakbits.com/UnmanagedToManagedCallback.cpp

Tom