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ChangeDisplaySettings.md

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Function name : ChangeDisplaySettings

Group: Device Context - Library: user32

The ChangeDisplaySettings function changes the settings of the default display device to the specified graphics mode.

Code examples:

How to change display settings: screen resolution, screen refresh rate

Declaration:

LONG ChangeDisplaySettings(
  LPDEVMODE lpDevMode,  // graphics mode
  DWORD dwflags         // graphics mode options
);

FoxPro declaration:

DECLARE INTEGER ChangeDisplaySettings IN user32;
	STRING  @ lpDevMode,;
	INTEGER   dwflags

Parameters:

lpDevMode [in] Pointer to a DEVMODE structure that describes the new graphics mode.

dwflags [in] Indicates how the graphics mode should be changed.

Return value:

The ChangeDisplaySettings function returns one of the predefined values, e.g. DISP_CHANGE_SUCCESSFUL (0).

Comments:

Specifying CDS_TEST as dwflags allows an application to determine which graphics modes are actually valid, without causing the system to change to that graphics mode.

To change the settings of a specified display device, use the ChangeDisplaySettingsEx function.