Does Bitmap.FromHbitmap Copy Memory?

[tsteinke]

I am in the process of creating a System.Drawing.Bitmap from a block of
memory containing a DIB Bitmap. I can think of about a half dozen ways
to do this. For perfomance reasons I don't want to be copying the
enitre bitmap around more than I have to.

Right now I am considering a Pinvoke call to CreateDIBitmap then
passing that handle to
Bitmap.FromHbitmap.

Does anyone know if Bitmap.FromHbitmap actually copies the bits
interally or if it simply sets up some sort of internal handle to the
existing bitmap.

Thanks.

 

[Michael Phillips, Jr.]

The documentation is clear. Gdiplus uses the existing handle.

You are responsible for both the gdi bitmap handle and the gdiplus
bitmap created with this handle.

You must not use DeleteObject on this handle until you have disposed
of the gdiplus bitmap object created with that handle.

Here is the reference to the documentation:
http://msdn.microsoft.com/library/d...lass/BitmapConstructors/Bitmap_52hbm_hpal.asp