plugin loading problem

[naresh]

I've changed those lines to be same but still can't load it...

[Kumosan]

The Qt plugin classes are really hard to use. Usually you have no idea why loading fails. I noticed that plugins are extremely sensitive to bugs in the .pro files.

If even one of your .h or .cpp files includes a .h which is not in your .pro file, even if not used at all, plugin loading might fail.

I usually even create a fake .cpp file for each interface file to put it in the .pro file.

[jacek]

The Qt plugin classes are really hard to use. Usually you have no idea why loading fails.

Never tried it, but "static plugins" might produce linker errors.

Anyway the problem with the above plugin was that the interface wasn't a real interface.
It should be:

public:
    virtual QString author() = 0;
    virtual QString version() = 0;
    virtual QString description() = 0;
    virtual QString name() = 0;

public:
    virtual QString author() = 0;
    virtual QString version() = 0;
    virtual QString description() = 0;
    virtual QString name() = 0;

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[Jeroen van der Waal]

Hi,

I am busy trying to figure out what goes wrong. I developed some plugins for the qt designer and sometimes it did not load either. To test if a plugin will load, you can do the following:

create a file called main.cpp with just this:

int main(int argc, char* argv[])
{
return 0;
}

then compile (libfirstplugin.so is the plugin you like to test)

g++ test.cpp libfirstplugin.so

In case of your code, I got:

libfirstplugin.so: undefined reference to `typeinfo for PluginInterface'
libfirstplugin.so: undefined reference to `vtable for PluginInterface'

So this is I guess why the plugin is not loading. I am searching for an answer on these messages