Programmatically changing the "presentation display mode"

Question

The presentation display modes are those you see when using the Windows+p shortcut:

1. Computer Only
2. Duplicate
3. Extend
4. Projector Only

Do any API calls exist which allow one to switch between these display modes?

I want to programmatically switch between monitor and HDMI TV (and do a bunch of other things simultaneously, hence Windows+p not being useful), but I'm hitting a brick wall.

Answer 1

You can obtain and change the display setting using EnumDisplaySettingsEx and ChangeDisplaySettingsEx:

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

Check this Codeproject project and this Stackoverflow question for example code

Answer 2

You can set the desktop display mode with SetDisplayConfig() eg.

SetDisplayConfig(0, NULL, 0, NULL, SDC_TOPOLOGY_EXTERNAL | SDC_APPLY);

You can retrieve the current display mode with QueryDisplayConfig(). eg.

DISPLAYCONFIG_TOPOLOGY_ID currentTopology;
QueryDisplayConfig(QDC_DATABASE_CURRENT, &PathArraySize, PathArray, &ModeArraySize, ModeArray, &currentTopology);

(Related source for this call here)

This is for C++. C# would require DLL imports.