Problems creating a CWnd

Hi,

I have to create a window on the screen (to show some graphics) and I have to do it without a dialog and decided to create a class derived from cwnd (it has to have a message queue for paint and timers and all that stuff) and gave it a function (which i can call from somewhere else) that does:

int x = CWnd::CreateEx( WS_EX_CONTROLPARENT, NULL, "-", WS_CHILD | WS_VISIBLE, CRect(0,0,200,200), this, 1, 0);

but it doesn't work but returns with False.

could somebody please help me with this ?

Use

Code:

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CWnd wnd;
wnd.CreateEx(.........

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You'll see nothing, add at least WS_BORDER.
Define a window class or use an existing one.

I doubt you'll be happy with the result. To have a well working MDI child of an MDI parent in an MFC application you should use the document/view mechanism to add a second CView derived class (and, maybe, a document class).