StorageProvider.TryGetWellKnownFolderAsync - System.AccessViolationException

[viktorspacil]

Describe the bug

Hi,
when I call StorageProvider.TryGetWellKnownFolderAsync(WellKnownFolder.Downloads) in x86 compiled code then I am getting System.AccessViolationException. x64 compiled code is working ok. Earlier version of Avalonia (11.0.11) worked fine.

To Reproduce

call: var folder = await StorageProvider.TryGetWellKnownFolderAsync(WellKnownFolder.Downloads)

Expected behavior

No exception in x86 compiled code

Avalonia version

11.2.1, 11.2.2

OS

Windows

Additional context

No response

[stevemonaco]

Looks like I introduced this in #17107 while fixing a regression.

x86 is having trouble with the SHGetKnownFolderPath call here:

Avalonia/src/Avalonia.Base/Platform/Storage/FileIO/BclStorageProvider.cs

Lines 151 to 158 in a530bbe

	private static unsafe string? TryGetWindowsKnownFolder(Guid guid)
	{
	nint path = IntPtr.Zero;
	string? result = null;
	try
	{
	var hr = SHGetKnownFolderPath(guid, 0, 0, &path);

And the signature:

Avalonia/src/Avalonia.Base/Platform/Storage/FileIO/BclStorageProvider.cs

Lines 176 to 177 in a530bbe

	[DllImport("shell32.dll")]
	private static unsafe extern int SHGetKnownFolderPath([MarshalAs(UnmanagedType.LPStruct)] Guid id, int flags, nint token, nint* ppszPath);

I'm not sure what the culprit is here though.