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