public static ImageSource GetThumbInt(string path, int width, int height, ThumbOptions opt)
{
IShellItem shellitem;
var shellGuid = new Guid(ShellItemGuid);
int ret = SHCreateItemFromParsingName(path, IntPtr.Zero, ref shellGuid, out shellitem);
if (ret != 0)
throw Marshal.GetExceptionForHR(ret);
var nativeSize = new NativeSize
{
Width = width,
Height = height
};
IntPtr hBitmap;
var shellItemImageFactory = (IShellItemImageFactory) shellitem;
if (shellItemImageFactory == null) return null;
HResult hr = shellItemImageFactory.GetImage(nativeSize, opt, out hBitmap);
Marshal.ReleaseComObject(shellitem);
if (hr != HResult.Ok)
{
throw Marshal.GetExceptionForHR((int)hr);
}
ImageSource imgsrc;
try
{
imgsrc = Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
}
finally
{
DeleteObject(hBitmap);
}
return imgsrc;
}
private static IntPtr GetHBitmap(string fileName, int width, int height, ThumbnailOptions options)
{
IShellItem nativeShellItem;
Guid shellItem2Guid = new Guid(IShellItem2Guid);
int retCode = SHCreateItemFromParsingName(fileName, IntPtr.Zero, ref shellItem2Guid, out nativeShellItem);
if (retCode != 0)
throw Marshal.GetExceptionForHR(retCode);
NativeSize nativeSize = new NativeSize();
nativeSize.Width = width;
nativeSize.Height = height;
IntPtr hBitmap;
HResult hr = ((IShellItemImageFactory)nativeShellItem).GetImage(nativeSize, options, out hBitmap);
Marshal.ReleaseComObject(nativeShellItem);
if (hr == HResult.Ok) return hBitmap;
throw Marshal.GetExceptionForHR((int)hr);
}
