winapi - Change resolution of display not working

Question

I'm trying to change resolution of my display using win32 call ChangeDisplaySettings with the following way:

DEVMODE devmode; devmode.dmPelsWidth = 1024; devmode.dmPelsHeight = 768; long result = ChangeDisplaySettings(&devmode, DM_PELSWIDTH || DM_PELSHEIGHT); qDebug() << "RESULT OF CHANGE DISPLAY :"<< result;

Always I get the same result value, -2, that indicates "display mode stored in the Registry". The source of this info is the following:

http://www.codeproject.com/Articles/36664/Changing-Display-Settings-Programmatically

The issue here is that my resolution DOES NOT CHANGE never. Any idea why I cannot do that?

Stas · Accepted Answer · 2015-10-08 11:13:21Z

1

Always consult with MSDN when using Window API.

This should work:

DEVMODE devmode; devmode.dmPelsWidth = 1024; devmode.dmPelsHeight = 768; devmode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT; devmode.dmSize = sizeof(DEVMODE); long result = ChangeDisplaySettings(&devmode, 0);

answered Oct 8, 2015 at 11:13

Stas

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2 Comments

Juan Garcia Over a year ago

Like a charm! Thanks @Stas This solution store the resolution in registry right? If I want to restore a previous resolution, how I need to proceed?

Juan Garcia Over a year ago

The solution of the above comment is ChangeDisplaySettings ( NULL, 0 );

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