Get icon of any folder

Question

I want to get the icon for any folder. I currently have a solution that works for all physical directories:

public static int GetIcon(string Path, out IntPtr ptrIcon) {
    try {
        ptrIcon = IntPtr.Zero;
        string localpath = Path;
        int result = -1;

        SHFILEINFO awSHFILEINFO = new SHFILEINFO();
        IntPtr PtrIconList;

        PtrIconList = SHGetFileInfo(
            localpath, 0,
            ref awSHFILEINFO, (uint)Marshal.SizeOf(awSHFILEINFO),
            (uint)SHGFI.SysIconIndex);

        result = awSHFILEINFO.iIcon.ToInt32();

        if (0 == result) {
            return 0;
        }

        if (PtrIconList != IntPtr.Zero && result != 0)
            ptrIcon = ImageList_GetIcon(PtrIconList, result, 0x1);

        return result;
    }
    catch (Exception) {
        ptrIcon = IntPtr.Zero;
        return -1;
    }
}

The problem is that this does not work for virtual folders like This PC or Quick Access or any external device like an android phone. So how do I get their icons?

Answer 1

I tested with "This PC" CLSID and it worked, with
SHILCreateFromPath and "shell:::{20D04FE0-3AEA-1069-A2D8-08002B30309D}" to get the pidl
then
SHGetFileInfo with SHGFI_PIDL flag

  [DllImport("Shell32.dll", SetLastError = true, CharSet = CharSet.Unicode)]  
  public static extern HRESULT SHILCreateFromPath([MarshalAs(UnmanagedType.LPWStr)] string pszPath, out IntPtr ppIdl, ref uint rgflnOut);  

I also tested with SHGetImageList to get bigger icons...