Hello All,

I've been working on this for several days now and could use some direction
so thanks in advace for any help.

I have a COM method which needs "the handle to the device context for the
bitmap."  I'm guessing that it's expecting a DIB but I'm not certain. If so,
how do I create a DIB from a GDI+ bitmap?

Here's the code I've written so far for creating the device context.  But
the result is a reference to an empty bitmap (regardless of the DIB issue).

   Public OSDBitmap As Bitmap
   Public OSDGraphics As Graphics

   Public Function GetHDCFromBitmap() As IntPtr
       OSDBitmap = New Bitmap("c:\testing.dib")
       Dim r As New Rectangle(0, 0, OSDBitmap.Width, OSDBitmap.Height)
       OSDBitmap.LockBits(r, Imaging.ImageLockMode.ReadWrite,
OSDBitmap.PixelFormat)
       OSDGraphics = Graphics.FromImage(OSDBitmap)

       'just for testing
       OSDGraphics.FillRectangle(New SolidBrush(Color.Red), 10, 10, 50, 50)
       Me.pbOSD.Image = bm
       'end testing

       Dim h1 As GCHandle = GCHandle.Alloc(bm, GCHandleType.Normal)
       Dim hBitmap As IntPtr = bm.GetHbitmap()

       Dim hdcBmp, hbmOld As IntPtr

       Dim h2 As GCHandle = GCHandle.Alloc(OSDGraphics,
GCHandleType.Normal)
       Dim hdc As IntPtr = OSDGraphics.GetHdc
       hdcBmp = CreateCompatibleDC(hdc)
       hbmOld = SelectObject(hdcBmp, hBitmap) 'hbitmap or hdc or hdcbmp?
       OSDGraphics.ReleaseHdc(hdc)
       If hdcBmp.ToInt32 = 0 Then
           Throw New Exception("no hdcBmp")
       End If

       DeleteObject(hdc)
       h1.Free()
       h2.Free()

       Return hdcBmp
   End Function

What am I doing wrong? and do you think I need a DIB?

Thanks,
Tom