Indirect call guard check detected invalid control transfer?

[davidjenkins]

I am tinkering with Media Foundation and CSWin32 (I have no experience with either).

I am following Microsoft's example at https://learn.microsoft.com/en-us/windows/win32/medfound/enumerating-video-capture-devices.

When I run the code a win32 exception is thrown:

Unhandled exception at 0x00007FF9772353D0 (ntdll.dll) in MyApp.exe: Indirect call guard check detected invalid control transfer.

internal static void Win32GetDevices()
{
    var hr = PInvoke.MFCreateAttributes(out IMFAttributes pAttributes, 1);
    if (hr.Failed)
        return;
    pAttributes.SetGUID(PInvoke.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE, PInvoke.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_GUID);
    // SO FAR GOOD, BUT NEXT LINE CRASHES
    hr = PInvoke.MFEnumDeviceSources(pAttributes, out IMFActivate ppDevices, out uint count);
    // ...
}

Am I doing something wrong?