Question

I’ve got a handle to a BITMAP structure (HBITMAP) in a Windows Mobile application — I’d like to save the bitmap as a PNG file, using the IImage interface if possible. (There’s no BMP file in this situation, the BITMAP is only in memory).

It looks like I could use IImagingFactory’s IImagingFactory::CreateImageEncoderToFile method to save the file but I think I’d first have to get the BITMAP converted into “IImage” format.

Any ideas on how to do this with native code?

Answer 1

Use CreateImageFromStream to read in your BITMAP data, that gives you an IImage.

Edit:

I did a little more research on this. There are a couple paths, but I think the easiest is to:

1. create a DIBSECTION and blit your bitmap to it.
2. Create a BitmapData instance pointing to the DIBSECTION for the image data.
3. Call CreateBitmapFromBuffer to generate an IBitmapImage interface
4. Push the IBitmapImage (which is an IImage) through your encoder.