ActiveX control retrieving parent information problem

I'm working on the ActiveX control which window is supose to be child of the ClientView window of the MDI application. I have some questions...
1. How I can (from the ActiveX) retrieve informations such are hInstance handle of the MDI application and hWnd of the Client View window?
I tried with GetWindowLong(), but compiler reports following error:
   HWND hWndParent;

   hWndParent = ::GetWindowLong(m_hWnd,
C2440: '=' : cannot convert from 'long' to 'struct HWND__ *'
What is going on here?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ekcAuthor Commented:
Adjusted points to 200
MS changes several data types from VC5 to VC6, which leads to results like this (the same with HINSTANCE, HBRUSH, etc.). Simply change your code to read

   hWndParent = ::GetWindowLong( ( HWND) m_hWnd,

and it should work...

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ekcAuthor Commented:
Correct conversion is:

hWndParent = ( HWND) ::GetWindowLong( m_hWnd, GWL_HWNDPARENT );

Easy points, ha?
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Programming

From novice to tech pro — start learning today.