Why MagSetImageScalingCallback function fails when is executed in new desktop?

[flashcoder]

Zitat von Der schöne Günther:

1. What does your GetLastError() return?
2. Im sure you saw the

   Zitat:

   The MagSetImageScalingCallback function is deprecated in Windows 7 and later, and should not be used in new applications.

3. Your example is missing your CreateDesktop shenanigans. As far as I recall, additional desktops are very limited. Example: They cannot have Aero features (and probably other DWM stuff).

GetLastError() returns 50 - ERROR_NOT_SUPPORTED - The request is not supported.

Really, this about DWM is true. And even that MagSetImageScalingCallback work, but MagSetWindowSource will fail because this api only works with Aero Theme enabled.

[flashcoder]

SOLVED!

This is working on Win 8/8.1 and 10, all x86 and x64.

Not works in Windows versions < 8

[Der schöne Günther]

As I said, that's because Aero and all that Jazz is inactive on separate Desktops on Windows < 8.

[flashcoder]

Zitat von Der schöne Günther:

As I said, that's because Aero and all that Jazz is inactive on separate Desktops on Windows < 8.

Exactly!