Re: [GD-Windows] In memory bitmap to HBITMAP

[Aaron H. <Vid...@ho...>]

I tend to avoid the other DI bitmap functions other than
CreateDIBSection() because I've also had similar difficulty with windows
misbehaving.

Btw, why are you bothering to mix GDI functions with DDraw?  Isn't that
dangerous?

- Aaron
OTri Studios

Brian Hook wrote:
> 
> I'm struggling with something fairly basic -- I want to load a BMP out
> of a compressed file, convert to an HBITMAP, then blit it into a DDraw
> surface.  I know how to do the first and last part, but the middle is
> causing problems.  Even worse, I'm not getting any errors.
> 
> Loading the bitmap doesn't seem to be a problem.  I load it up and parse
> and find the BITMAPFILEHEADER and BITMAPINFOHEADER no probs.  I also
> locate the raw bits no problem (and inspect with the debugger to make
> sure I'm getting what I think I'm getting -- in this case, solid
> magenta).  Looks fine.
> 
> The next step is to create a DC compatible with the desktop:
> 
> HDC hDC = CreateCompatibleDC( NULL );
> 
> I then create a HBITMAP compatible with DC, and using the bits I pulled:
> 
> HBITMAP hbm;
> 
> hbm = CreateDIBitmap( hDC, lpBMIH, CBM_INIT, lpBits, lpBMIH,
> DIB_RGB_COLORS );
> 
> lpBMIH are simply pointers to the appropriate BITMAPINFOHEADER.  They
> have correct values in them.  The bitmap is returned successfully.
> 
> To verify things, I grab the bits out of the Bitmap to make sure
> everything is cool:
> 
> GetDIBits( hDC, hbm, 0, iHeight, tempbuffer, &bmi, DIB_RGB_COLORS );
> 
> It returns the correct number of scan lines, but tempbuffer is filled
> with black.  This means either the CreateDIBitmap() filled in the bitmap
> with black, or the GetDIBits() failed somehow.  I can't figure out which
> is the real culprit, but the bitmap is pretty much a black square.
> 
> Any suggestions on how to hunt this down?
> 
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