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From: Peter Olcott on 1 Mar 2010 14:31
I need a good Library for reading and writing PNG files.
Which one are the best?


From: Giovanni Dicanio on 1 Mar 2010 15:42
"Peter Olcott" <NoSpam(a)OCR4Screen.com> ha scritto nel messaggio
news:0vqdnaU94IWaixHWnZ2dnUVZ_g6dnZ2d(a)giganews.com...
> I need a good Library for reading and writing PNG files. Which one are the
> best?

The official library to manage PNG files should be libnpg:

http://www.libpng.org/pub/png/libpng.html

However, there is a convenient C++ class for (amongst other things) read and
write PNG images:

CxImage
http://www.codeproject.com/KB/graphics/cximage.aspx

HTH,
Giovanni


From: David Webber on 3 Mar 2010 17:31


"Peter Olcott" <NoSpam(a)OCR4Screen.com> wrote in message
news:0vqdnaU94IWaixHWnZ2dnUVZ_g6dnZ2d(a)giganews.com...

> I need a good Library for reading and writing PNG files. Which one are the
> best?

The native CImage class will write (and, I believe though I don't do it,
read) png files. Roughly, if you have an HBITMAP and a file name:


CImage image;
image.Attach( hBitmap );

HRESULT hResult = image.Save( pszFilename, ImageFormatPNG );
image.Detach();

[This may need XP or later - haven't checked recently. When I needed to
support Win98 I used a library called FreeImage.]

Dave
--
David Webber
Mozart Music Software
http://www.mozart.co.uk
For discussion and support see
http://www.mozart.co.uk/mozartists/mailinglist.htm

From: Peter Olcott on 3 Mar 2010 21:00

"David Webber" <dave(a)musical-dot-demon-dot-co.uk> wrote in
message news:eUwjTFyuKHA.6124(a)TK2MSFTNGP04.phx.gbl...
>
>
> "Peter Olcott" <NoSpam(a)OCR4Screen.com> wrote in message
> news:0vqdnaU94IWaixHWnZ2dnUVZ_g6dnZ2d(a)giganews.com...
>
>> I need a good Library for reading and writing PNG files.
>> Which one are the best?
>
> The native CImage class will write (and, I believe though
> I don't do it, read) png files. Roughly, if you have an
> HBITMAP and a file name:
>
>
> CImage image;
> image.Attach( hBitmap );
>
> HRESULT hResult = image.Save( pszFilename,
> ImageFormatPNG );
> image.Detach();

This turned out to be the best solution, and the one that I
am using.

>
> [This may need XP or later - haven't checked recently.
> When I needed to support Win98 I used a library called
> FreeImage.]
>
> Dave
> --
> David Webber
> Mozart Music Software
> http://www.mozart.co.uk
> For discussion and support see
> http://www.mozart.co.uk/mozartists/mailinglist.htm


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