Qt 4.3.1 Windows Svg plugin problem

[tzioboro]

Hello
I have following problem with Qt 4.3.1 on windows XP plaftorm.
I am using svg module to draw icons on buttons from embedded resources.
When I run program everything works ok. Svg modules are loaded correctly (plugins\iconengines\qsvg4.dll).
But when I install program on other machine then plugin is not loaded.
I have added proper path by

QCoreApplication::addLibraryPath(QCoreApplication: :applicationDirPath()+QString("/plugins"));

and copy plugin directory to the directory with app (as I always did when usiong for ex. sqlite plugin) but module is not loaded. Do I need to do enything extra to make Qt to use that plugin? Or maybe im missing something?


Forgot to mention:
I am using MinGw.

[wysota]

Copy the plugin to iconengines subdirectory of the directory where the application binary is located.

[tzioboro]

Well it works ... it finds plugins in application directory as described in QCoreApplication::addLibraryPath. It is workaround, but It does not work if all plugin is copied to plugins directory and proper path is set.
To be precise.
App is testapp.exe and is in
C:\Tmp\testapp.exe
iconengine plugin is in
C:\Tmp\plugins\iconengines\qsvg4.dll

and QCoreApplication::addLibraryPath is added as mentioned in my previous message. Just after instanating QApplication.

<code>
QApplication app(argc, argv);
QCoreApplication::addLibraryPath(QCoreApplication: :applicationDirPath()+QString("/plugins"));
</code>


So I am asking what went wrong?

[wysota]

C:\Tmp\plugins\iconengines\qsvg4.dll

Should be C:\Tmp\iconengines\qsvg4.dll. WIthout "plugins".

[tzioboro]

I think i found what was wrong.
When I change plugins directory to anything else as test or plugin and move plugins to that directory and add this path to libraryPaths then it works.
I think it is a bug.

[tzioboro]

But I want to have iconengines in plugins directory. So what should I do ?

[wysota]

Read my post above. The directory name (or path) where the "iconengines" directory is located doesn't matter. All that matters is the existance of "iconengines" directory in one of the directories in the library search path.

But I want to have iconengines in plugins directory. So what should I do ?

Short answer: you can't.

Long answer: Take a look at QCoreApplication sources. Plugins are loaded from within there. Maybe you can load the plugin yourself from a custom location.

Medium answer: compile the plugin statically into your application (see "static plugins" in the docs).

[tzioboro]

Read my post above. The directory name (or path) where the "iconengines" directory is located doesn't matter. All that matters is the existance of "iconengines" directory in one of the directories in the library search path.



Short answer: you can't.

Long answer: Take a look at QCoreApplication sources. Plugins are loaded from within there. Maybe you can load the plugin yourself from a custom location.

Medium answer: compile the plugin statically into your application (see "static plugins" in the docs).

Ok I did read your post above. And I totaly agree with you. I was wondering why
C:\Tmp\plugins\iconengines\qsvg4.dll
could not be loaded when "custom" path is added this custom path is
C:\Tmp\plugins
by QCoreApplication::addLibraryPath(... +QString("\plugins");
and it is working for anything else like
C:\Tmp\plugin\iconengines\qsvg4.dll
and QCoreApplication::addLibraryPath(... +QString("\plugin"); in code.

I don't see in QCoreApplication code why custom path can not be in C:\Tmp\plugins.

I know that it does not matter where iconengines is until it is in library search path - but it is in this path. I just wondering why it is not working. I am using this approach to have plugins in one direcotry (generaly for sqldrivers) in two other projects and it works.