static Dpi GetDpiFromGetDpiForMonitor(IntPtr hMonitor, Win32.MonitorDpiType dpiType)
{
try
{
var ret = new Dpi();
uint dpiX = 0, dpiY = 0;
Win32.NativeMethods.GetDpiForMonitor(hMonitor, dpiType, ref dpiX, ref dpiY);
ret.X = dpiX;
ret.Y = dpiY;
return(ret);
}
catch (Exception ex)
{
#if DEBUG
Debugger.Break();
#endif
Debug.WriteLine(ex.Message);
return(Dpi.Default);
}
}
/// <summary>
/// You can get current screen's DPi (screen which has mouse cursor currently), when you set dpiType to RawDpi or AngularDpi.
/// Refer to https://msdn.microsoft.com/en-us/library/windows/desktop/dn280510(v=vs.85).aspx
/// </summary>
public static Dpi GetDpiFromGetDpiForMonitor(System.Windows.Media.Visual visual, Win32.MonitorDpiType dpiType = Win32.MonitorDpiType.Default)
{
Debug.Assert(visual != null);
if (visual == null)
{
return(Dpi.Default);
}
// NOTE: app.manifestに、Windows8.1対応を明記しなければならないため、このような判定は行わないことにする。
//if (IsPerMonitorDpiServiceSupported == false) { return GetDpiFromCompositionTargetTransformToDevice(visual); }
var hwndSource = PresentationSource.FromVisual(visual) as System.Windows.Interop.HwndSource;
if (hwndSource == null)
{
return(Dpi.Default);
}
var hmonitor = Win32.NativeMethods.MonitorFromWindow(hwndSource.Handle, Win32.NativeMethods.MonitorDefaultTo.MONITOR_DEFAULTTONEAREST);
uint dpiX = 96, dpiY = 96;
Win32.NativeMethods.GetDpiForMonitor(hmonitor, (Win32.MonitorDpiType)dpiType, ref dpiX, ref dpiY);
return(new Dpi((int)dpiX, (int)dpiY));
}
