This is a core problem when you use Qt in dlls and use those dlls from non qt binaries. Some Qt functions require a Q(Core)Application instance.

You could load a plug-in “by hand”. It’s a bit tricky…

it should work with most plug-ins :-) They just have to be found by the path.

@Gerolf, Since i am using Qt4.3.3, i can’t find some of the keywords like “qRegisterStaticPluginInstanceFunction” etc in my version.

i just used the following in the dll function

QLibrary lib(QLatin1String(“C:\\Qt\\4.3.3\\plugins\\sqldrivers\\qsqlodbcd4.dll”)); if(lib.load()) { lib.resolve(“qt_plugin_instance”); } else { MessageBoxA(NULL,“Unable to load qodbc”,“Error”,1); exit(-5); }

Now since i am not getting any MessageBox, i assume that i was able to load the plugin library. But again i am using this dll in another C++ console application, i am getting the error QODBC Driver not loaded.

Sorry for the above code the Code is as follow :

You only loaded a library, but did not add the plug in.

can be found in qplugin.h. And without a call to qRegisterStaticPluginInstanceFunction the plugin is not registered in the global plugin cache. Without registration, it’s not usable.