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Roddy Pratt · Guest

I've successfully imported the Apple Quicktime control as a C++Builder
component, but I now want to have a control which inherits from that
one.

My inherited component is just a dummy at this stage - no additional
methods/properties, and look like this:-

class PACKAGE TQTControl2 : public TQTControl
{
virtual __fastcall TQTControl2(TComponent* AOwner) :
TQTControl(AOwner)
{};
virtual __fastcall TQTControl2(HWND Parent) :
TQTControl(Parent)
{};
};

My package builds OK, and I can use both the TQTControl and TQTControl2
at design time. But, when I run an application with a TQTControl2 on a
form, the app crashes with an AV exception as soon the mouse enters the
area of the TQTControl2 on the form. The TQTControl on the same form
works just fine.

I don't know much about using Activex controls - should I be able to
create new controls which inherit from Activex controls in this way, or
is there something else subtle with GUIDs that I need to do...?

- Roddy