How to get DPI with WinUI 3?

Question

How to get DPI with WinUI 3?

Hong 1,246

DisplayInformation no longer has GetForCurrentView() that allows retrieving LogicalDpi. How can we obtain LogicalDpi with Win UI?

Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff

2023-12-05T01:53:36.2333333+00:00

May you use Win32 High DPI functions, for example GetDpiForWindow?
Hong 1,246 Reputation points

2023-12-05T02:17:20.86+00:00

@Xiaopo Yang - MSFT Thank you for the tip. Is there a straightforward way to do this with C#?
Hong 1,246 Reputation points

2023-12-05T03:26:38.47+00:00
@Xiaopo Yang - MSFT Thank you. It works. I used the following code:

IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(((App)Application.Current).MainWindow); dpi = GetDpiForWindow(hWnd);

Could you turn your comment into an answer for me to accept?

Accepted answer

0 additional answers

Your answer

Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff

2023-12-05T01:53:36.2333333+00:00

May you use Win32 High DPI functions, for example GetDpiForWindow?
Hong 1,246 Reputation points

2023-12-05T02:17:20.86+00:00

@Xiaopo Yang - MSFT Thank you for the tip. Is there a straightforward way to do this with C#?
Hong 1,246 Reputation points

2023-12-05T03:26:38.47+00:00

@Xiaopo Yang - MSFT Thank you. It works. I used the following code:

IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(((App)Application.Current).MainWindow); dpi = GetDpiForWindow(hWnd);

Could you turn your comment into an answer for me to accept?

Answer 1

Xiaopo Yang - MSFT 12,731 Microsoft External Staff

Calling Win32 functions is a straightforward way as there is no such information in DisplayInformation class.

        [DllImport("User32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern int GetDpiForWindow(IntPtr hwnd);

        public f()
        {
            IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
            int dpi = GetDpiForWindow(hWnd);
        }

Share via

How to get DPI with WinUI 3?

0 additional answers

Your answer