How can I load PNGs into a PictureControl?

Question

What can I use to load PNGs into a Picture Control, in a way that uses double-buffering?

I've been using this code, which handles the double-buffering for BMPs, as to avoid the flicker of constant repainting. Now I need to switch to PNGs to reduce the app size.

I found CxImage, but the whole library is too big and it would defeat the purpose of switching to PNGs.

Any thoughts?

You already handle the painting so you might as well use [``](http://msdn.microsoft.com/en-us/library/ms533798%28v=vs.85%29.aspx) It can load and paint PNGs and is included with any Windows version. JPEG as well, smaller yet. — Hans Passant, Jun 11 '14 at 18:12

score 2 · Accepted Answer · edited Jun 12 '14 at 13:39

Just stay with your BMP code. To bring it to the screen you need the bitmap (or use GDI+ as mentioned in a comment).

Load the PNG file with CImage. Use CIamge::Detach and you have your PNG as a bitmap. Than use your current code.

Loading the PNG into a CImage can be done from disk or from a memory buffer (resource) with a stream. In both cases use CImage::Load.

Afaik there is a simple CPngImage class in the MFC that derives from CBitmap, that provides all functions you need.

How can I load PNGs into a PictureControl?

1 Answers1