how do I get the real Position (in Pixels) of a WPF-Window?
this.PointFromScreen( new Point( 0, 0 ) ); does not gives real Position on Screen when I use DPI of 150% for Font. I guess this has something to do with scaling, but in my case I need the "real" position on Screen.
I think you want PointToScreen. PointFromScreen converts screen coordinates into the coordinate system of the Visual.
var window = new Window(); Point screenCoordinates = window.PointToScreen(new Point(0,0)); I have this piece of code, but honestly I didn't remember if it was used once at least. I believe it should work "decently"...
BTW, I wonder why do you need a similar information.
[StructLayout(LayoutKind.Sequential)] private struct POINT { public int X; public int Y; } /// <summary> /// The ClientToScreen function converts the client-area coordinates of a specified point to screen coordinates. /// </summary> /// <param name="hWnd">Handle to the window whose client area is used for the conversion.</param> /// <param name="pt">Pointer to a POINT structure that contains the client coordinates to be converted. The new screen coordinates are copied into this structure if the function succeeds.</param> /// <returns>If the function succeeds, the return value is nonzero.</returns> [DllImport("User32", EntryPoint = "ClientToScreen", SetLastError = true, ExactSpelling = true, CharSet = CharSet.Auto)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool ClientToScreen( IntPtr hWnd, ref POINT pt); /// <summary> /// Code for getting screen relative Position in WPF /// </summary> /// <param name="point">The source point to be trasnformed</param> /// <param name="relativeTo">The Visual object used as reference</param> /// <returns>The screen-relative point obtained by the trasformation</returns> /// <remarks> /// http://blogs.msdn.com/llobo/archive/2006/05/02/Code-for-getting-screen-relative-Position-in-WPF.aspx /// One of the common customer queries that we see on the forums /// is to get the screen relative position of a point. /// Currently we do not provide an API which allows this functionality. /// However, Nick Kramer came up with this code on the forum /// and it works great for LTR (left to right) systems. /// Following is the code for getting the screen relative position. /// </remarks> [EnvironmentPermissionAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static Point? TransformToScreen( Point point, Visual relativeTo) { // Translate the point from the visual to the root. var hwndSource = PresentationSource.FromVisual(relativeTo) as HwndSource; if (hwndSource == null) return null; var root = hwndSource.RootVisual; // Transform the point from the root to client coordinates. var transformToRoot = relativeTo.TransformToAncestor(root); var pointRoot = transformToRoot.Transform(point); var m = Matrix.Identity; var transform = VisualTreeHelper.GetTransform(root); if (transform != null) { m = Matrix.Multiply(m, transform.Value); } // Convert from “device-independent pixels” into pixels. var offset = VisualTreeHelper.GetOffset(root); m.Translate(offset.X, offset.Y); var pointClient = m.Transform(pointRoot); pointClient = hwndSource.CompositionTarget.TransformToDevice.Transform(pointClient); var pointClientPixels = new POINT(); pointClientPixels.X = (0 < pointClient.X) ? (int)(pointClient.X + 0.5) : (int)(pointClient.X - 0.5); pointClientPixels.Y = (0 < pointClient.Y) ? (int)(pointClient.Y + 0.5) : (int)(pointClient.Y - 0.5); // Transform the point into screen coordinates. var pointScreenPixels = pointClientPixels; if (ClientToScreen( hwndSource.Handle, ref pointScreenPixels)) { return new Point( pointScreenPixels.X, pointScreenPixels.Y); } else { return new Point(); } }