RE: Rotating the display using ChangeDisplaySettingsEx
- From: jetan@xxxxxxxxxxxxxxxxxxxx ("Jeffrey Tan[MSFT]")
- Date: Wed, 28 May 2008 06:21:26 GMT
Hi Mikael,
The code below looks like incomplete - there's no resolution set. If that's
really the complete code, then that's probably the cause of the failure. A
rotation is also a resolution change (e.g. 1024x768 -> 768x1024) and you
have to specify the new resolution for it to be accepted since a mode of
1024x768x90 degrees is not a valid mode.
Have you tried your code on other machines? I find some other cases
regarding ChangeDisplaySettingsEx+DM_DISPLAYORIENTATION which are display
driver dependent. So, if your code runs well on other machines while fails
on this specific machine, it is very likely a driver problem.
If adding the valid resolution setting still did not resolve this problem,
can you provide a simple sample project for me to reproduce this problem?
Finally, based on my research on my colleague's Vista Intel display card
Dell machine, the display configuration application igfxcfg.exe internally
communicates with igfxdev.exe which also calls ChangeDisplaySettingsExA API
with DM_DISPLAYORIENTATION and other flags to rotate the screen.
I will wait for your further feedback, thanks.
Best regards,
Jeffrey Tan
Microsoft Online Community Support
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