private static ImageData LoadThumbnail(string path, DateTime dtLastWriteTime, out Size sizeRaw, out Size sizeActual, out string toolTipText, out bool fCached)
{
sizeRaw = sizeActual = Size.Empty;
toolTipText = null;
fCached = false;
IntPtr zero = IntPtr.Zero;
IShellItem ppsi = null;
ISharedBitmap ppvThumb = null;
LocalThumbnailCache o = null;
try {
zero = PInvoke.ILCreateFromPath(path);
if ((zero != IntPtr.Zero) && (PInvoke.SHCreateShellItem(IntPtr.Zero, null, zero, out ppsi) == 0))
{
o = new LocalThumbnailCache();
IThumbnailCache cache2 = (IThumbnailCache)o;
uint flags = 0;
uint pOutFlags = 0;
WTS_THUMBNAILID pThumbnailID = new WTS_THUMBNAILID();
uint cxyRequestedThumbSize = (uint)Math.Min(0x400, Math.Min(QTUtility.PreviewMaxWidth, QTUtility.PreviewMaxHeight));
if (cache2.GetThumbnail(ppsi, cxyRequestedThumbSize, flags, out ppvThumb, ref pOutFlags, ref pThumbnailID) == 0)
{
IntPtr ptr2;
if ((pOutFlags & 2) == 2)
{
fCached = true;
}
if (ppvThumb.Detach(out ptr2) == 0)
{
Bitmap bmp = Image.FromHbitmap(ptr2);
Size size = bmp.Size;
sizeRaw = sizeActual = size;
ImageData data = new ImageData(bmp, null, path, dtLastWriteTime, size, size);
data.Thumbnail = true;
try {
toolTipText = data.TooltipText = ShellMethods.GetShellInfoTipText(zero, false);
}
catch {
}
return(data);
}
}
}
}
catch (Exception exception) {
QTUtility2.MakeErrorLog(exception, null);
}
finally {
if (zero != IntPtr.Zero)
{
PInvoke.CoTaskMemFree(zero);
}
if (ppsi != null)
{
Marshal.ReleaseComObject(ppsi);
}
if (ppvThumb != null)
{
Marshal.ReleaseComObject(ppvThumb);
}
if (o != null)
{
Marshal.ReleaseComObject(o);
}
}
return(null);
}
public System.Windows.Media.ImageSource GetThumbnail(string imagePath, ThumbnailQuality quality)
{
IShellItem shItem;
Guid iIdIShellItem = new Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe");
var hr = SHCreateItemFromParsingName(imagePath, IntPtr.Zero, iIdIShellItem, out shItem);
if (hr == 0)
{
Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
Guid CLSID_LocalThumbnailCache = new Guid("50EF4544-AC9F-4A8E-B21B-8A26180DB13F");
var type = Type.GetTypeFromCLSID(CLSID_LocalThumbnailCache);
var tbCache = (IThumbnailCache)Activator.CreateInstance(type);
ISharedBitmap bmp = null;
WTS_CACHEFLAGS cFlags;
WTS_THUMBNAILID bmpId;
uint qualitySetting;
switch (quality)
{
case ThumbnailQuality.Normal:
qualitySetting = 96;
break;
case ThumbnailQuality.High:
case ThumbnailQuality.Full:
qualitySetting = 128;
break;
default:
qualitySetting = 96;
break;
}
hr = (int)tbCache.GetThumbnail(shItem, qualitySetting, WTS_FLAGS.WTS_EXTRACT, out bmp, out cFlags, out bmpId);
if (hr == 0)
{
var bmpPtr = IntPtr.Zero;
if (bmp.Detach(out bmpPtr) == 0)
{
try
{
var iSrc = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
bmpPtr, IntPtr.Zero, Int32Rect.Empty,
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
DeleteObject(bmpPtr);
iSrc.Freeze();
return(iSrc);
}
finally
{
bmpPtr = IntPtr.Zero;
Marshal.ReleaseComObject(bmp);
Marshal.ReleaseComObject(shItem);
bmp = null;
shItem = null;
}
}
else
{
Marshal.ReleaseComObject(bmp);
Marshal.ReleaseComObject(shItem);
return(null);
}
}
else
{
Marshal.ReleaseComObject(shItem);
return(null);
}
}
return(null);
}