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Editorial Team
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Asked: 2026-06-18T00:16:30+00:00

I am attempting to change the display settings to Duplicate when I have 2

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I am attempting to change the display settings to “Duplicate” when I have 2 monitors connected to a PC?

Ie, I am attempting to select the following setting(outlined in red) but using a WinAPI function call.

enter image description here

My Problem: I dont know what WinAPI function call I use to change the display setting to “Duplicate”? I’ve googled and haven’t found any such function.

I am looking for a function that is supported on Windows 2000 or XP and up and not just a Windows Vista and up function. Does anyone know what WinAPI function call I use to achieve this?

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1 Answer

  1. Editorial Team

    I believe you want to use ChangeDisplaySettingsEx. You set up DEVMODE structures for both monitors, with the dmPosition member set to (0, 0), and set (only) the DM_POSITION flag, so all you do is change their relative positions, not things like resolution or bit depth.

    This is supposed to work back as far as Windows 2000.

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