Thread: Changing Refresh Rate With ChangeDisplaySettings()

1. I'm using the following code to change my display settings:

Code:

DEVMODE devModeScreen;

memset(&devModeScreen, 0, sizeof(devModeScreen));
devModeScreen.dmSize = sizeof(devModeScreen);	
devModeScreen.dmPelsWidth = width;			
devModeScreen.dmPelsHeight = height;			
devModeScreen.dmBitsPerPel = bits;			
devModeScreen.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
devModeScreen.dmDisplayFrequency = 85;

ChangeDisplaySettings(&devModeScreen, CDS_FULLSCREEN)

However, the refreash rate changes to 60Hz. My monitor is capable of 85Hz at the specified resolution. Why isn't the refresh rate displaying at 85Hz?

2: Can I use something like GetSystemMetrics() to know the current display's refresh rate?

1) I have absolutely no idea! Sorry about that
2) ::GetDeviceCaps(::GetDC(NULL), VREFRESH)

Originally Posted by Tonto

1) I have absolutely no idea! Sorry about that
2) ::GetDeviceCaps(::GetDC(NULL), VREFRESH)

This returned a value of 0.

Also, my window is not displaying in full screen mode. The taskbar, window borders, and title bar are still visible. Any insight on this?

Originally Posted by Codeplug

http://cboard.cprogramming.com/showthread.php?t=56791

gg

Thanks for that. The search appears to be down so I probably wouldn't have found that.

It seems I was missing a great deal of data from my DEVMODE structure that was filled in by EnumDisplaySettings().