How can I get the DPI in WPF?

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142

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+1 Q:

How can I get the DPI in WPF?

+6 A:

http://blogs.msdn.com/jaimer/archive/2007/03/07/getting-system-dpi-in-wpf-app.aspx seems to work

PresentationSource source = PresentationSource.FromVisual(this);

double dpiX, dpiY;
if (source != null) {
    dpiX = 96.0 * source.CompositionTarget.TransformToDevice.M11;
    dpiY = 96.0 * source.CompositionTarget.TransformToDevice.M22;
}

Paul Betts 2009-12-17 01:17:46

This is exatly what I needed, thanks!

tom greene 2009-12-17 01:49:58

Keep in mind though that WPF units aren't pixels, they're device-independent @ 96DPI "pixelish-units"; so really what you want, is the scale factor between 96DPI and the current DPI (so like 1.5 for 144DPI)

Paul Betts 2009-12-17 01:51:40

So that's not what I need then :( How do I get the scale factor?

tom greene 2009-12-17 18:02:44

Should I use GetDeviceCaps (.., LOGPIXELSX)?

tom greene 2009-12-17 18:10:54

@tom it's just [dpiX, dpiY] / 96.0

Paul Betts 2009-12-17 23:06:53

ansaurus

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How can I get the DPI in WPF?

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