Hi everyone,
  I need to call VB ActiveX DLL method from VC++, how can
I pass an object (user-defined type) parameter which is
defined as a class type in VB ActiveX DLL.
  The VC++ classwizard will generate following method
declaration in wrapper class:
  void SetDocumentation(LPDISPATCH);

  In VB ActiveX DLL, the corresponding mehod would be:
  sub SetDocumentation(obj as CMyObject);

  My question is how can I create and pass LPDISPATCH in
VC++?

thanks in advance
anna

C++ equivalent (assuming CMyObject is defined in the VB dll):

    HRESULT SetDocumentation(/*[in, out]*/ _CMyObject** obj);

Although I understand MFC does things differently, which is presumably
where the classwizard comes in.  If you're not using MFC, you should
use #import.

Presumably you have an instance of CMyObject to pass.  Also presumably,
it's a dual interface.  In that case, you can QI it for IDispatch and
pass the result.