[Insight-users] Incompatible PNG libs

[Miller, James V (Research)]

As you realized, ITK 1.6 and QT 3.2.1 use different versions of the png
library.

In the CVS version of ITK, we have mangled the names within the png library
so that it will not conflict when integrated in other systems that use a 
different version of the png library. So you can pull ITK from the cvs
repository.

You could build ITK using the "system" (or QT's) version of the png library.

There is an advanced CMake option ITK_USE_SYSTEM_PNG that allows you to
build
ITK using a different version of the png library.  I have never tried this.

Jim


-----Original Message-----
From: Michael Eichler [mailto:michael.eichler at student.uni-tuebingen.de]
Sent: Friday, April 30, 2004 8:25 AM
To: Insight-users at itk.org
Subject: [Insight-users] Incompatible PNG libs


Hi!

I try to evaluate and visualize ITK registration methods within a QT
framework. For that I created a static library with the QT gui stuff and
linked it with CMAKE to my ITK classes.

The CMakeLists.txt instruction looks like this:

..
LINK_LIBRARIES (
ITKIO
ITKCommon
ITKNumerics
$(QT_QT_LIBRARY)
MyLib
)

It all compiles and links well, but when I try to open a .png file through
my
gui, I get the following error:

libpng warning: Application was compiled with ping.h from libpng-1.2.5
libpng warning: Application is running with ping.c from libpng-1.0.12
libpng error: Incompatible libpng versions in application and library

I forebode that there's a conflict between QT's and ITK's PNG library (the
qt
and itk applications itself work fine), but I have no idea how to solve this

conflict!?

I'm using ITK 1.6.0, QT 3.2.1 and CCMAKE 1.8.3 on Suse 9.0.

Thank you,
Michael

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