public static Bitmap GenerateThumbnail(string filename)
{
Bitmap result;
if (Environment.OSVersion.Version.Major < 6)
{
result = null;
}
else
{
IShellItem shellItem = null;
IntPtr zero = IntPtr.Zero;
Guid riid = new Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe");
Bitmap bitmap = null;
UnsafeNativeMethods.SHCreateItemFromParsingName(filename, IntPtr.Zero, riid, out shellItem);
try
{
((IShellItemImageFactory)shellItem).GetImage(new SIZE(256, 256), SIIGBF.SIIGBF_THUMBNAILONLY, out zero);
bitmap = ThumbnailGenerator.ConvertPixelByPixel(zero);
}
catch (Exception)
{
try
{
if (shellItem != null)
{
Marshal.ReleaseComObject(shellItem);
}
if (zero != IntPtr.Zero)
{
Marshal.Release(zero);
}
}
catch (Exception)
{
}
result = null;
return(result);
}
Marshal.ReleaseComObject(shellItem);
Marshal.Release(zero);
result = bitmap;
}
return(result);
}
