Re: Subclassing an edit control

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#12581

From: Martin Golm
Date: Fri, 28 Nov 2003 11:05

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Gary Setter wrote:
> I see that your main window which is the frame for your edit window reserves
> memory for a pointer to a tWindow in
>   wndclass.cbWndExtra = sizeof(tWindow*);

Yes, I do that to forward the messages from the global window procedure
to the appropriate window's window procedure.
Interestingly enough this isn't working for the edit control. First I
didn't use SetWindowLong() with the GWL_WNDPROC parameter. It simply
didn't exist. Whenever my application received a message for the edit
control it crashed, and the call stack was non-exisiting (just a lot of
???'s). This was because the pointer I cast to tWindow* didn't represent
a tWindow descendant. Don't know why...

> But if you can't why not use Get/SetWindowLong(hWnd,GWL_USERDATA) ?
> That would let you use the same technique to tie that tEdit/tWindow object
> to the window handle in the static WndProc function.

Sorry, I don't quite get the point?

Martin

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