mfc, bitmap object

microsoft.public.vc.mfc - Microsoft Visual C


mfc >> bitmap object

by Wesley Lorrez » Sat, 29 Jan 2005 17:07:36 GMT

Hi

I use a bitmap object in a MFC dialog box to display an image. I have
assigned a variable m_picture_contr to the bitmap object and use it in a
button to assign a bitmap to it:

the code I use in the button:
CBitmap Bmp1;
Bmp1.LoadBitmap(IDB_RED);
m_picture_contr.SetBitmap(Bmp1);

When I move another window (or application) on top of the dialog box and
move it away again, the image is not there anymore, it is like wiped out by
the window I moved over. Can someone help me by informing me how to prevent
the bitmap from being wiped out by other applications/windows? Or what I do
wrong because it behaves like this? THX.

GreetingZ

Wesley





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mfc >> bitmap object

by Jeff Partch [MVP] » Sat, 29 Jan 2005 21:34:57 GMT





by
prevent
do

Your CBitmap appears to be function local. If that's the case, then its dtor
will DeleteObject the HBITMAP it wraps as soon as the function exits. This
leaves your m_picture_control holding an invalid HBITMAP which it can no
longer repaint. Consider making your CBitmap a class member object as well.
--
Jeff Partch [VC++ MVP]




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mfc >> bitmap object

by Wesley Lorrez » Sun, 30 Jan 2005 02:01:31 GMT

>> Consider making your CBitmap a class member object as well

THX !!

GreetingZ

Wes



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