Rotate screen on Vista from within program

What you were doing was not appropriate for the general case.

Your old method assumed that you had NvCPL.dll installed (That's the NVidia control panel), that it was the 32-bit dll, that it was the current driver for the video card, that dtcfg and the other commands were correct, and that the screen was not rotated to begin with.


For a proper way to do this in code look at the msdn article: Changing Screen Orientation Programmatically which describes how to use the ChangeDisplaySettingsEx function to rotate the display.

Why using rundll32 with random APIs is BAD.

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Original post by frob What you were doing was not appropriate for the general case.

I'm not writing software for the general case. All units on which the software will be deployed are put together and set up by us.

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For a proper way to do this in code

Does not work, and EnumDisplaySettingsEx() shows only 0 for allowable display orientation; clearly, the NVIDIA driver does not expose rotation to this Microsoft interface; the control applet must be using some other API.