How can I make my app ignore window's "HIGH DPI SCALING"?
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Thank you! For some reason I assumed this needs to be done after.
It's like this now:
QApplication::setAttribute(Qt::AA_DisableHighDpiScaling); // Disable DPI support QApplication a(argc, argv); MainWindow w; w.showMaximized(); return a.exec();But it doesn't really seem to have an effect.
This is how it looks on a display with 100% scaling
and this is how it looks on a display with 150% scaling 
@Curtwagner1984 said in How can I make my app ignore window's "HIGH DPI SCALING"?:
it doesn't really seem to have an effect.
Try running your app in "DPI Unaware" mode: https://doc.qt.io/qt-5/highdpi.html#migrate-existing-applications
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wrote on 23 May 2022, 05:41 last edited by
Thanks,
I made a file named qt.conf with the line<application> -platform windows:dpiawareness=0And put it in the the folder of the executable. Nothing changed.
Is this correct? Should
applicationbe the name of the application? -
Thanks,
I made a file named qt.conf with the line<application> -platform windows:dpiawareness=0And put it in the the folder of the executable. Nothing changed.
Is this correct? Should
applicationbe the name of the application?@Curtwagner1984 said in How can I make my app ignore window's "HIGH DPI SCALING"?:
I made a file named qt.conf with the line
<application> -platform windows:dpiawareness=0Those are command line arguments. You pass the extra arguments while launching your .exe from the Command Prompt .
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wrote on 24 May 2022, 11:40 last edited by
Thank you! This works!
Is there a way to set it up in the application itself, without the need to provide extra command line arguments? -
Thank you! This works!
Is there a way to set it up in the application itself, without the need to provide extra command line arguments?@Curtwagner1984
good old putenv, probably -
@Curtwagner1984
good old putenv, probablywrote on 24 May 2022, 12:13 last edited by@J-Hilk
I looked at this. What environment variable name (and value) are you proposing for-platform windows:dpiawareness=0, I could not see that it worked this way?? -
@J-Hilk
I looked at this. What environment variable name (and value) are you proposing for-platform windows:dpiawareness=0, I could not see that it worked this way??@JonB admittedly
the official way to do it, is apparently the creation and deployment of aqt.conffile, same level as the executable with this content:[Platforms]
WindowsArguments = dpiawareness=0that said:
qputenv("dpiawareness", "0"); or qputenv("windows:dpiawareness", "0");
I'm unsure, I'm not using it often enough :D
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@JonB admittedly
the official way to do it, is apparently the creation and deployment of aqt.conffile, same level as the executable with this content:[Platforms]
WindowsArguments = dpiawareness=0that said:
qputenv("dpiawareness", "0"); or qputenv("windows:dpiawareness", "0");
I'm unsure, I'm not using it often enough :D
wrote on 24 May 2022, 12:27 last edited by JonB@J-Hilk said in How can I make my app ignore window's "HIGH DPI SCALING"?:
qputenv("dpiawareness", "0"); or qputenv("windows:dpiawareness", "0");
I'm unsure, I'm not using it often enough :DThere is/I can see no evidence that a Qt program would recognise either of these proposed environment variable names. Unless you can see where it says it does.... I see only the command line or
qt.conffile approaches so far. -
@JonB admittedly
the official way to do it, is apparently the creation and deployment of aqt.conffile, same level as the executable with this content:[Platforms]
WindowsArguments = dpiawareness=0that said:
qputenv("dpiawareness", "0"); or qputenv("windows:dpiawareness", "0");
I'm unsure, I'm not using it often enough :D
wrote on 30 May 2022, 05:19 last edited by@J-Hilk said in How can I make my app ignore window's "HIGH DPI SCALING"?:
[Platforms]
WindowsArguments = dpiawareness=0Thank you! I tried to used this before but I've put incorrect syntax in this file. This works.
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wrote on 2 Sept 2024, 13:52 last edited by
@Curtwagner1984 @JonB @J-Hilk @JKSH
I used Python PyQt5-5.15 for my application
I have guimain.exe and panelgui.ui files . Made qt.conf file
But when I change windows scaling to 125% or 150% the text fonts and other ui widgets get messed up...how to make it work i.e disable windows scaling for application -
wrote on 5 Nov 2024, 08:50 last edited by Violet Giraffe 11 May 2024, 10:44
In Qt 6 you can override the scale factor with the QT_SCALE_FACTOR env variable, but there is a problem: it doesn't set the factor to your value, it multiplies it. For example, if the system has 150% and you want 100%, you need to set QT_SCALE_FACTOR to 0.666667 (and even then it might not end up exactly 1.0 but rather 1.0001).
Is this intentional? There is a number of problems resulting from this multiplicative behavior, the primary one being when the application is moved between screens with different scale factors. I want to have 1.0 everywhere, not 0.66!
Also,
-platform windows:dpiawareness=0DOES NOT WORK!
Or, rather, it does the wrong thing. It disables too much,devicePixelRatio()reports 1.0 but the window is stretched and blurry. -
wrote on 5 Nov 2024, 11:54 last edited by
Found the proper option:
QT_ENABLE_HIGHDPI_SCALING=0.