How to handle Windows 7 screen resolution change?
in [MFC]
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From: Lewis Z. on 20 Apr 2010 15:09 I have a MFC dialog based window application with an image as background. Everytime Windows 7 changes screen resolution and the image would be completely gone. I'm wondering what message I should handle to avoid this. I have tried to search the forum and couldn't find any relevant info. Thank you. Louis
From: David Ching on 20 Apr 2010 18:57 "Lewis Z." <lzhou8(a)gmail.com> wrote in message news:333097ae-8486-4d2d-8737-2ede4a359d05(a)r28g2000vbi.googlegroups.com... > I have a MFC dialog based window application with an image as > background. Everytime Windows 7 changes screen resolution and the > image would be completely gone. I'm wondering what message I should > handle to avoid this. I have tried to search the forum and couldn't > find any relevant info. > > Thank you. > WM_DISPLAYCHANGE, you can handle it using ON_MESSAGE. But it's puzzling why changing the resolution causes your image to disappear. -- David
From: Joseph M. Newcomer on 20 Apr 2010 21:33 How are you drawing this image? You haven't said. I presume you are doing it in an OnPaint handler of your derived dialog class. If you are not, that is what is wrong. You would need to show the code. joe On Tue, 20 Apr 2010 12:09:33 -0700 (PDT), "Lewis Z." <lzhou8(a)gmail.com> wrote: >I have a MFC dialog based window application with an image as >background. Everytime Windows 7 changes screen resolution and the >image would be completely gone. I'm wondering what message I should >handle to avoid this. I have tried to search the forum and couldn't >find any relevant info. > >Thank you. > >Louis Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
From: Lewis Z. on 20 Apr 2010 23:38 On Apr 20, 5:57 pm, "David Ching" <d...(a)remove-this.dcsoft.com> wrote: > "Lewis Z." <lzh...(a)gmail.com> wrote in message > > news:333097ae-8486-4d2d-8737-2ede4a359d05(a)r28g2000vbi.googlegroups.com... > > > I have a MFC dialog based window application with an image as > > background. Everytime Windows 7 changes screen resolution and the > > image would be completely gone. I'm wondering what message I should > > handle to avoid this. I have tried to search the forum and couldn't > > find any relevant info. > > > Thank you. > > WM_DISPLAYCHANGE, you can handle it using ON_MESSAGE. > > But it's puzzling why changing the resolution causes your image to > disappear. > > -- David David, thanks for the reply. After I posted the msg, I did find out WM_DISPLAYCHANGE with the help of the spy tool.
From: Lewis Z. on 20 Apr 2010 23:52 Joe, thanks for the reply. I handled the drawing of the background image in the EraseBackground msg handler. After I figured out the WM_DISPLAYCHANGE, I called RedrawWindow in this msg handler. It didn't help all the time. Sometimes I still saw the missing image. I have basic OnPaint function, meaning it just calling CDialog:OnPaint(). I commented out my OnPaint function. Now the background image is diaplayed all the time whenever the display setting is changed. But new problem shows up. Calling SetDlgItemText() is causing problems. It shows some garbled texts unless screen is refreshed. (I have a timer periodically displaying texts with null brush to show transparent texts.) Any suggestions? On Apr 20, 8:33 pm, Joseph M. Newcomer <newco...(a)flounder.com> wrote: > How are you drawing this image? You haven't said. I presume you are doing it in an > OnPaint handler of your derived dialog class. If you are not, that is what is wrong. > > You would need to show the code. > joe > > On Tue, 20 Apr 2010 12:09:33 -0700 (PDT), "Lewis Z." <lzh...(a)gmail.com> wrote: > >I have a MFC dialog based window application with an image as > >background. Everytime Windows 7 changes screen resolution and the > >image would be completely gone. I'm wondering what message I should > >handle to avoid this. I have tried to search the forum and couldn't > >find any relevant info. > > >Thank you. > > >Louis > > Joseph M. Newcomer [MVP] > email: newco...(a)flounder.com > Web:http://www.flounder.com > MVP Tips:http://www.flounder.com/mvp_tips.htm
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