Using SetClassLongPtr

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Hi,
I am trying to change dialog background color by changing brush using SetClassLongPtr in MFC.

Its not working.

Where do i put the call so that it will work?

Thanks,
Vaibhav.

Posted 30-Sep-10 19:34pm

Vaibhav Gade

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Rhuros · Answer 1 · 2010-10-01T03:19:00

As the MSDN Help[^]indicates:

'Use the SetClassLongPtr function with care. For example, it is possible to change the background color for a class by using SetClassLongPtr, but this change does not immediately repaint all windows belonging to the class. '

So I would suggest performing this as part of your OnInitDialog() or calling and InvalidateRect() after you've called SetClassLongPtr()...

Vaibhav Gade · Answer 2 · 2010-10-06T19:13:00

Hi,

I have coded like this:

OnInitDialog
{
    <pre>SetClassLongPtrW(GetSafeHwnd(), GCLP_HBRBACKGROUND, (LONG_PTR)GetStockObject(WHITE_BRUSH));

   CRect rect;
   GetWindowRect(&amp;rect);
   InvalidateRect(&amp;rect);

}

But Dialog's background color is not changed.

Suggest me way to use SetClassLongPtr to change background color.

Thanks,
Vaibhav.

Using SetClassLongPtr

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