Hello @MERUN KUMAR MAITY
Let’s break down your requirements and address them step by step.
Tracking the Last DPI Sent by WM_DPICHANGED:
- The
WM_DPICHANGED
message is sent to a window when the DPI of the monitor hosting the window changes. The current DPI for a window always equals the last DPI sent byWM_DPICHANGED
.- To track the last DPI, you can modify your existing code. Here’s how you can retrieve the monitor-dependent DPI while handling
WM_DPICHANGED
:
- To track the last DPI, you can modify your existing code. Here’s how you can retrieve the monitor-dependent DPI while handling
private const int WM_DPICHANGED = 0x02E0;
// Inside your WndProc method:
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == WM_DPICHANGED)
{
// Get the monitor handle
IntPtr hMonitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONULL);
MONITORINFOEX mix = new MONITORINFOEX();
mix.cbSize = Marshal.SizeOf(mix);
GetMonitorInfo(hMonitor, ref mix);
// Get the DPI from the monitor
DEVMODE dm = new DEVMODE();
dm.dmSize = (short)Marshal.SizeOf(dm);
EnumDisplaySettings(mix.szDevice, ENUM_CURRENT_SETTINGS, ref dm);
// Now 'dm.dmPelsWidth' and 'dm.dmPelsHeight' contain the DPI
// You can use this information for scaling your application.
// ...
handled = true;
}
return IntPtr.Zero;
}
- This modification will allow you to retrieve the DPI when
WM_DPICHANGED
is received.
Applying the Last DPI for WPF Interface Scaling:
- Once you have the DPI value, you can use it to scale your WPF application. You can adjust your UI elements based on this DPI value.
- For example, you can set the
LayoutTransform
property of your UI elements to scale them proportionally based on the DPI.- Remember that you’ll need to handle this scaling logic in your WPF controls or views.
Windows 11 Environment:
- While some older solutions may not work in Windows 11, the approach I provided above should be compatible with Windows 11 as well.
- Make sure to test your application thoroughly to ensure it behaves as expected on both Windows 10 and Windows 11.
Feel free to integrate the modified code snippet into your application
I hope that this response has addressed your query and helped you overcome your challenges. If so, please mark this response as Answered. This will not only acknowledge our efforts, but also assist other community members who may be looking for similar solutions.