B4J Question How to get Windows Scale Factor (Text Size, Apps, Layout)

[Magma]

Hi there...

is the any inline java or something to get windows scale factor ?

Found a powershell script... but I am wondering if anything else:

Add-Type @'
  using System;
  using System.Runtime.InteropServices;
  using System.Drawing;

  public class DPI {
    [DllImport("gdi32.dll")]
    static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

    public enum DeviceCap {
      VERTRES = 10,
      DESKTOPVERTRES = 117
    }

    public static float scaling() {
      Graphics g = Graphics.FromHwnd(IntPtr.Zero);
      IntPtr desktop = g.GetHdc();
      int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES);
      int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES);

      return (float)PhysicalScreenHeight / (float)LogicalScreenHeight;
    }
  }
'@ -ReferencedAssemblies 'System.Drawing.dll'

[Math]::round([DPI]::scaling(), 2) * 100

Thanks in advance.

 

[Erel]

Try this (it is from BCTextEngine):

Dim fx As JFX
Dim jo As JavaObject = fx.PrimaryScreen
Dim scale As Float = jo.RunMethod("getOutputScaleX", Null)

 

[Magma]

This is not only works... but works "live" (no need to reboot if changed the same time)...

For the history... found that before Erel's gave me solution:

HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics

AppliedDPI as INT --- 96 dpi (if 100%)
So if was for example 144... 144/96=1.50

But if changed and not reboot - not getting the new value...

@Erel... Do i need to get "getOutputScaleY" too... is there possiblity to be a different value ?

 

[Erel]

Do i need to get "getOutputScaleY" too... is there possiblity to be a different value ?

I don't think so.