public Boolean RefreshThumbnail(uint iconSize, out WTS_CACHEFLAGS flags)
{
ISharedBitmap bmp = null;
WTS_CACHEFLAGS cacheFlags = WTS_CACHEFLAGS.WTS_DEFAULT;
WTS_THUMBNAILID thumbId = new WTS_THUMBNAILID();
Boolean result = false;
try
{
if (ThumbnailCache.GetThumbnail(this.shellItemNative, iconSize, WTS_FLAGS.WTS_FORCEEXTRACTION | WTS_FLAGS.WTS_SCALETOREQUESTEDSIZE, out bmp, cacheFlags, thumbId) != HResult.WTS_E_FAILEDEXTRACTION)
{
result = true;
}
}
finally
{
if (bmp != null)
{
Marshal.ReleaseComObject(bmp);
}
}
flags = cacheFlags;
return(result);
}
public HResult ExtractAndDrawThumbnail(IntPtr hdc, uint iconSize, out WTS_CACHEFLAGS flags, User32.RECT iconBounds, out bool retrieved, bool isHidden, bool isRefresh = false)
{
IThumbnailCache thumbCache = null;
if (this.ComInterface != null)
{
var IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
var CLSID_LocalThumbnailCache = new Guid("50EF4544-AC9F-4A8E-B21B-8A26180DB13F");
IntPtr cachePointer;
Ole32.CoCreateInstance(ref CLSID_LocalThumbnailCache, IntPtr.Zero, Ole32.CLSCTX.INPROC, ref IID_IUnknown, out cachePointer);
thumbCache = (IThumbnailCache)Marshal.GetObjectForIUnknown(cachePointer);
}
var res = HResult.S_OK;
ISharedBitmap bmp = null;
flags = WTS_CACHEFLAGS.WTS_DEFAULT;
var thumbId = default(WTS_THUMBNAILID);
try {
retrieved = false;
res = thumbCache.GetThumbnail(this._Item.ComInterface, iconSize,
isRefresh ? (WTS_FLAGS.WTS_FORCEEXTRACTION | WTS_FLAGS.WTS_SCALETOREQUESTEDSIZE) : (WTS_FLAGS.WTS_INCACHEONLY | WTS_FLAGS.WTS_SCALETOREQUESTEDSIZE), out bmp, flags, thumbId);
var hBitmap = IntPtr.Zero;
if (bmp != null)
{
bmp.GetSharedBitmap(out hBitmap);
retrieved = true;
int width;
int height;
Gdi32.ConvertPixelByPixel(hBitmap, out width, out height);
Gdi32.NativeDraw(hdc, hBitmap, iconBounds.Left + (iconBounds.Right - iconBounds.Left - width) / 2, iconBounds.Top + (iconBounds.Bottom - iconBounds.Top - height) / 2, width, height, isHidden);
Gdi32.DeleteObject(hBitmap);
}
} finally {
if (bmp != null)
{
Marshal.ReleaseComObject(bmp);
}
}
return(res);
}
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);
}