Screen refresh rate.

[imagenetics]

1. How to retrieve current screen refresh rate value (the one in MHz in advanced display properties dialog) and store it within a variable?

2. How to change it?

 

[Supernat03]

Never tried this, but see if this works:

DEVMODE dmMode;

memset(&dmMode, 0, sizeof(dmMode));
dmMode.dmSize = sizeof(dmMode);
dmMode.dmFields = DM_DISPLAYFREQENCY;
dmMode.dmDisplayFrequency = 70; // Assuming 70 Hz.

ChangeDisplaySettings(&dmMode, CDS_UPDATEREGISTRY);

If CDS_UPDATEREGISTRY is specified and it is possible to change the graphics mode dynamically, the information is stored in the registry and DISP_CHANGE_SUCCESSFUL is returned. If it is not possible to change the graphics mode dynamically, the information is stored in the registry and DISP_CHANGE_RESTART is returned.

Good luck,
Chris