Re: CImage and LoadFromResource

From:

"AliR" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 14 Jul 2009 13:38:07 -0500

Message-ID:

<m847m.12323$vO4.3625@flpi145.ffdc.sbc.com>

I usually use this class to load images other than bitmaps, but I haven't
been able to get PNG files to load correctly from resource.
http://www.learnstar.com/AliR/resourcestream.h

Here is how to use it

      CImage Image;
      CResourceStream str(0, MAKEINTRESOURCE(IDR_PNG), _T("PNG"));
      Image.Load(&str);

AliR.

"vvf" <vvf@vvf.com> wrote in message
news:e8ftJHJBKHA.5068@TK2MSFTNGP02.phx.gbl...

Hi All,

Hopefully some of you have encountered the following problem and maybe you
have some solutions for me:

I am attempting to use the CImage class in order to load a PNG image. If I
use CImage::Load( <path_to_PNG_filename> ) everything works. However, if I
attempt to use CImage::LoadFromResource I cannot load my PNG that I
imported into my resources (it basically says that it cannot find the
image inside the .exe) I know that the documentation says that I have to
have the resource type as BITMAP in order for this method to work. The
only way to change a PNG resource to a BITMAP one is to manually edit the
rc2 file. However, if I do that, my IDE complains that the PNG file is not
a 3.00 bitmap format.

HOWEVER, if I do the same thing for a JPEG or GIF image everything is ok
(i.e., if I import the JPEG/GIF, then manually edit the rc2 file and set
them to BITMAP) I can successfully use the LoadFromResource method.
Therefore, it seems that the only problem shows up with the PNG format.

I really don't understand why the CImage class advertises that it can load
PNG files both internally and externally (via LoadFromResource and Load
respectively) since I don't seem to be able to load a PNG via
LoadFromResource.

Did anyone run into this situation ? Any solutions ? The only one that I
can think of is to leave my PNG files as external files and not include
them into the .exe itself but I don't want to do that. The bitmap files
take a lot of space so that is why I would like to use PNG files.

Thank you.

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