Having trouble refreshing the Windows aero preview in C#

  aero, c++, pinvoke, windows

I want to refresh the aero preview that’s displayed when hovering over a taskbar icon on Windows (or when Alt+Tabbing).

I found a function called DwmInvalidateIconicBitmaps that seems promising, but when I use it:

[DllImport("dwmapi.dll")]
static extern int DwmInvalidateIconicBitmaps(IntPtr hwnd);
...
int res = DwmInvalidateIconicBitmaps(MyWindowHandle);

res gets set to -2,147,024,809. When I look at the hex it comes out to FFFF FFFF 8007 0057, which seems to correspond to E_INVALIDARG according to this site.

My window handle however is valid and is used in other places successfully. Another site I came across mentioned that this error can be thrown when the DLL couldn’t be loaded. Could that be the issue?

I also doesn’t see this function mentioned on the pinvoke site though I do see other DWM functions, which is odd.

Windows 10 / .NET Core

Source: Windows Questions

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