Method Dpi.OfWindow(+ 2 overloads)

Overload

Gets the DPI of a window, as used in the window's process. It never changes for that window instance.

public static int OfWindow(wnd w, bool supportWin81 = false)
Parameters
w  (wnd)

A top-level window or control. Can belong to any process.
supportWin81  (bool)

If true, works on Windows 8.1 and later; however on Windows 8.1 slower and less reliable. If false (default), works on Windows 10 1607 and later.
Returns
int

If failed, returns the system DPI (Dpi.System).

Remarks

The result depends on the DPI awareness of the window:

  • per-monitor-DPI-aware - usually DPI of the windows's screen.
  • system aware - system DPI (DPI of the primary screen).
  • unaware - 96.

The result also depends on the Windows version:

  • Works best on Windows 10 1607 and later. Uses API GetDpiForWindow.
  • On Windows 8.1 works if supportWin81true. If false (default), returns Dpi.System.
  • On Windows 7 and 8.0 always returns Dpi.System, because there are no Windows API. Most apps are system-DPI-aware and the result is correct; for unaware apps the result is incorrect. These Windows versions don't support per-monitor DPI.

Overload(next)

Returns OfWindow(w.Hwnd()).

public static int OfWindow(Control w)
Parameters
w  (Control)

A Winforms window or control.
Returns
int

Overload(top)

Returns OfWindow(w.Hwnd()).

public static int OfWindow(DependencyObject w)
Parameters
w  (DependencyObject)

A WPF window or element.
Returns
int