How to dispose BitmapSource?

Question

Hi all,

How can I dispose BitmapSource (actually InteropBitmapSource)? 

Example of memory leak:

 

            while (true)

            {

                using (Bitmap bitmap = new Bitmap(1000, 1000))

                {

                    BitmapSource source = Imaging.CreateBitmapSourceFromHBitmap(bitmap.GetHbitmap(),

                        IntPtr.Zero, new Int32Rect(0, 0, bitmap.Width, bitmap.Height),

                        BitmapSizeOptions.FromEmptyOptions());

                }

                GC.Collect();

                Console.Read();

            }

 

Thanks for any hints.

 

Tom

Answer 1

did you figure this out?  I'm having the exact same issue right now

Answer 2

When you call GetHbitmap you are responsible for calling DeleteObject to free its memory

 

[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);

       
private void DemonstrateGetHbitmap() 
{
    Bitmap bm = new Bitmap("Picture.jpg");
    IntPtr hBitmap = bm.GetHbitmap();
             
    // Do something with hBitmap.
    DeleteObject(hBitmap);
}

Answer 3

This is spot on.

Answer 4

Forgot to mention that the information (and code sample) was taken from the documentation for GetHbitmap.

Answer 5

Ok. Thanks. I did not check the documentation for Bitmap.GetHbitmap(), I just used IntelliSense:)

Answer 6

Whoops, CreateBitmapSourceFromHBitmap create copy of HBitmap?