|
private DeleteObject ( |
||
| obj | ||
| return | void | |
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 static Bitmap CopyHBitmapToBitmap(IntPtr nativeHBitmap)
{
// Get width, height and the address of the pixel data for the native HBitmap
BITMAP bitmapStruct = new BITMAP();
Gdi32.GetObjectBitmap(nativeHBitmap, Marshal.SizeOf(bitmapStruct), ref bitmapStruct);
// Create a managed bitmap that has its pixel data pointing to the pixel data of the native HBitmap
// No memory is allocated for its pixel data
Bitmap managedBitmapPointer = new Bitmap(
bitmapStruct.bmWidth, bitmapStruct.bmHeight, bitmapStruct.bmWidth * 4, PixelFormat.Format32bppArgb, bitmapStruct.bmBits);
// Create a managed bitmap and allocate memory for pixel data
Bitmap managedBitmapReal = new Bitmap(bitmapStruct.bmWidth, bitmapStruct.bmHeight, PixelFormat.Format32bppArgb);
// Copy the pixels of the native HBitmap into the canvas of the managed bitmap
Graphics graphics = Graphics.FromImage(managedBitmapReal);
graphics.DrawImage(managedBitmapPointer, 0, 0);
graphics.Dispose();
// Delete the native HBitmap object and free memory
Gdi32.DeleteObject(nativeHBitmap);
// Return the managed bitmap, clone of the native HBitmap, with correct transparency
return(managedBitmapReal);
}
private Bitmap GetBitmap(System.Windows.Size size)
{
IntPtr hBitmap = GetHBitmap(size);
// return a System.Drawing.Bitmap from the hBitmap
Bitmap returnValue = null;
if (hBitmap != IntPtr.Zero)
{
returnValue = GetBitmapFromHBitmap(hBitmap);
}
// delete HBitmap to avoid memory leaks
Gdi32.DeleteObject(hBitmap);
return(returnValue);
}
private BitmapSource GetBitmapSource(System.Windows.Size size)
{
IntPtr hBitmap = GetHBitmap(size);
// return a System.Media.Imaging.BitmapSource
// Use interop to create a BitmapSource from hBitmap.
if (hBitmap != IntPtr.Zero)
{
BitmapSource returnValue = Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
System.Windows.Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
// delete HBitmap to avoid memory leaks
Gdi32.DeleteObject(hBitmap);
return(returnValue);
}
return(null);
}
private BitmapSource GetBitmapSource(System.Windows.Size size, Boolean isCopyItem = false)
{
//FIXME: fix the cache retrieval options
//RetrievalOption = ShellThumbnailRetrievalOption.Default;
IntPtr hBitmap = GetHBitmap(size, isCopyItem);
// return a System.Media.Imaging.BitmapSource
// Use interop to create a BitmapSource from hBitmap.
if (hBitmap != IntPtr.Zero)
{
BitmapSource returnValue = Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
System.Windows.Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions()).Clone();
// delete HBitmap to avoid memory leaks
Gdi32.DeleteObject(hBitmap);
return(returnValue);
}
return(null);
}
