public HResult ExtractAndDrawThumbnail(IntPtr hdc, uint iconSize, out WTS_CACHEFLAGS flags, User32.RECT iconBounds, out bool retrieved, bool isHidden, bool isRefresh = false)
{
HResult res = HResult.S_OK;
ISharedBitmap bmp = null;
flags = WTS_CACHEFLAGS.WTS_DEFAULT;
WTS_THUMBNAILID thumbId = new WTS_THUMBNAILID();
try
{
retrieved = false;
res = ThumbnailCache.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);
IntPtr 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);
}
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);
}