//! [0]
namespace Foo
{
    struct MyInterface { ... };
}

Q_DECLARE_INTERFACE(Foo::MyInterface, "org.examples.MyInterface")
//! [0]


//! [1]
Q_EXPORT_PLUGIN2(pnp_extrafilters, ExtraFiltersPlugin)
//! [1]


//! [2]
Q_IMPORT_PLUGIN(qjpeg)
//! [2]


//! [3]
TEMPLATE      = app
QTPLUGIN     += qjpeg qgif qmng    # image formats
//! [3]