Attach DLL created HWND to CView?

[dmosses]

Hi,

I'm using a DLL which creates a window for displaying an image. I'd like to attach this to the CView subclass object in my MFC app so that i can manipulate the image using the standard windows messages and handlers, e.g. MouseScroll etc.

I've tried:

HWND h_displayWnd = GetHwnd(hDisplayObj);

//detach window created with CView
topView->Detach();
//attach my HWND
topView->Attach(h_displayWnd);

This doesn't work - it crashes trying to assert wincore.cpp line 384.

I've also tried using SubclassWindow, which doesn't have the same assertion failure, but does tell me that I'm trying to subclass a window with the incorrect derrived class.

Does anyone know how I can do this - all I want to do is move the window that I've been given by the DLL around.

Many thanks,

Dmosses.