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GeneralRe: how get dpi scale factor Pin
Le@rner23-Mar-22 0:00
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GeneralRe: how get dpi scale factor Pin
Richard MacCutchan23-Mar-22 0:23
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GeneralRe: how get dpi scale factor Pin
Dave Kreskowiak23-Mar-22 2:49
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GeneralRe: how get dpi scale factor Pin
Le@rner23-Mar-22 17:55
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GeneralRe: how get dpi scale factor Pin
Dave Kreskowiak24-Mar-22 6:47
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QuestionRe: how get dpi scale factor Pin
Eddy Vluggen22-Mar-22 23:45
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AnswerRe: how get dpi scale factor Pin
JudyL_MD24-Mar-22 6:15
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GeneralRe: how get dpi scale factor Pin
Randor 24-Mar-22 20:49
professional Randor 24-Mar-22 20:49 
Judy,

Great answer, I hope to see you answering more C# related questions in the future. Smile | :)

The Windows API equivalent to what you are doing there would be calling the GetDpiForMonitor function[^] and obtaining the MDT_EFFECTIVE_DPI[^] value and dividing by the system default. Of course the operating system hides dpi/scaling values from threads unless it's DPI aware[^]. So the caller needs to set thread DPI awareness before performing the calculation.

I'd like to add that GetScaleFactorForMonitor[^] may return incorrect values. The manual calculation is preferred.

I'd also like to add that the process doesn't necessarily need to be DPI aware. Beginning with Win10 1607 you can create a DPI aware thread to get those values by using the SetThreadDpiAwarenessContext function[^].

Hope to see you answering more often!

Best Wishes,
-David Delaune
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