[Qt-interest] svg plugin not loaded

[Bryce Allen]

Thanks Andrew - unfortunately this has not fixed the problem. I finally
got QT_DEBUG_PLUGINS=1 to display output (I think using CONFIG +=
console), and the correct DLLs are found but they fail to load, so the
problem has nothing to do with paths.

Strangely if I use a debug exe and dlls, and run the exe from cygwin,
the svg icon plugin loads and the icons show up. In all other
cases the svg icon plugin fails to load. Specifically qsvgicon4.dll (or
qsvgicond4.dll for debug).

I use the following code to make sure that the qt directory is not
used, because I want the app to work on any machine without Qt
installed:

QStringList pathList;
pathList.append(qApp->applicationDirPath());
qApp->setLibraryPaths(pathList);

I copied the executable built by Qt Designer to a separate
directory, and copied dlls from the qt subdirectory of the
qt designer install path, eg C:\Qt\2009.05\qt\bin and
C:\Qt\2009.05\qt\plugins.

>From cygwin using a debug build and debug dlls, which actually works, I
get this:

QFactoryLoader::QFactoryLoader() looking at
"C:/.../systray/iconengines/qsvgicond.dll"
keys ("svg", "svgz", "svg.gz")

When running the same executable from cmd, I get this:

QFactoryLoader::QFactoryLoader() looking at
"C:/.../systray/iconengines/qsvgicond.dll"
keys ("svg", "svgz", "svg.gz")
QFactoryLoader::QFactoryLoader() looking at
"C:/.../systray/iconengines/qsvgicond.dll"
"Cannot load library C:/../systray/iconengines/qsvgicond4.dll: The
specified module could not be found." could not load

Note that the paths to qsvgicond4.dll are the same in both lines. Not
sure why it is examining the same dll twice, but this happens for the
other builds also.

When using a release build and release dlls under cmd, I get two
"The specified module could not be found" errors when it tries to load
qsvgicon4.dll. Under cygwin I get two "The specified procedure could not
be found." errors instead.

I am using the LGPL qt creater, version 2009.05 (1.30, qt 4.6.0). I had
the same problem with 2009.04, although I'm not sure if the
QT_DEBUG_PLUGIN output is the same since I got that working after
upgrading to .05.

Any ideas?

Thanks,
Bryce

On Tue, 1 Dec 2009 15:11:12 +1100
Andrew Maclean <andrew.amaclean at gmail.com> wrote:
> Create a directory called plugins/imageformats (in the same directory
> as your executable) with the svg plugins in it.
> Then in your code
> 
> Create a function like this:
> 
> //! Find and load a translation file.
> /*!
>  *
>  *  @param translator - the translator.
>  */
> void PluginLoader(QDir & pluginsDir)
> {
>   // Plugins
>   pluginsDir = QDir(qApp->applicationDirPath());
> 
>   #if defined(Q_OS_WIN)
>      if (pluginsDir.dirName().toLower() == "debug" ||
> pluginsDir.dirName().toLower() == "release")
>          pluginsDir.cdUp();
>   #elif defined(Q_OS_MAC)
>      if (pluginsDir.dirName() == "MacOS")
>      {
>          pluginsDir.cdUp();
>          pluginsDir.cdUp();
>          pluginsDir.cdUp();
>      }
>   #endif
>   pluginsDir.setPath( pluginsDir.absolutePath() + "/plugins");
> }
> 
> and in main:
>   QDir pluginsDir;
>   PluginLoader(pluginsDir);
>   QStringList libPaths;
>   // Append the local plugin path to the qApp library paths
>   if ( pluginsDir.exists() )
>   {
>     libPaths << pluginsDir.absolutePath() << qApp->libraryPaths();
>     qApp->setLibraryPaths(libPaths);
>   }
> 
> 
> This should append the plugins path to wherever you put it.
> 
> I hope this helps.
> 
> Regards
> Andrew
> 
> 
> On Tue, Dec 1, 2009 at 10:19 AM, Bryce Allen <qt at bda.ath.cx> wrote:
> > I am trying to run the systray example on a Windows XP machine
> > without qt installed by placing the proper DLLs in the application
> > directory. I built the app with Qt Creater 1.2.1 (qt 4.5.3) and
> > release build config, and my app dir looks like this:
> >
> > systray.exe
> > QtCore4.dll
> > QtGui4.dll
> > QtXml4.dll
> > iconengines\qsvgicon4.dll
> > imageformats\qsvg4.dll
> >
> > I have read the documentation and some relevant posts in the
> > archives, and this looks like the correct locations for the dlls.
> > However when I run the app the svg icons are missing. I tried
> > setting QT_DEBUG_PLUGINS=1 and running systray.exe from cmd, but no
> > debug info is displayed.
> >
> > I also checked QImageReader::supportedImageFormats() and svg is not
> > in the list, so it appears that it's really a problem with loading
> > the svg plugin and not with finding the image data. Any ideas?
> >
> > Thanks,
> > Bryce
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest
> >
> 
> 
>