"bern11" <ber***@yahoo.com> wrote in message
news:lJKdnYAPK5iNWrbZnZ2dnUVZ_sednZ2d@comcast.com...
>
> What is the best way to access the bits in a bitmap loaded into an image
> control (I'm converting a color image to greyscale).  I have a method
> which works, but it seems kindof cludgy.  Here is what I did:
>
> HBITMAP hSrcBmp; // GDI Bitmap Handle
> BITMAP SrcBmp; // GDI Bitmap
> int iStatus, iDims[2];
> char *cSrc; // Pointer to Bits
>
> // MyImagePbx is a picturebox control with an bitmap already loaded
> // EditSrcBmp is a global Bitmap^
> EditSrcBmp = gcnew Bitmap(MyImagePbx->Image);
>
> // Create? a GDI bitmap hSrcBmp =
> (HBITMAP)EditSrcBmp->GetHbitmap().ToInt32();
>
> // Get bitmap object
> iStatus = GetObject(hSrcBmp,sizeof(SrcBmp),&SrcBmp);
>
> // Now i have direct access
> cSrc = (char *)SrcBmp.bmBits;
>
>
> // Do I have to release or destroy the hSrcBmp bitmap handle?
>
>
> It seems like there has to be a better way.

> See the Bitmap.LockBits method.
>