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CHAPTER 11 PLUGINS
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When you build a plugin, you build a dynamic link library (DLL). If you add a line reading CONFIG += static to your project file, the resulting library is made for static linking. This means that the library is made for being added to the application at link time instead of being dynamically loaded at run-time. The project file for the Darken plugin, when adapted to static linking, is shown in Listing 11-26. Compare this with the project file for the Flip plugin from Listing 11-21. Listing 11-26. The project file for a statically linked plugin TEMPLATE = lib TARGET = darken CONFIG += plugin release VERSION = 1.0.0 INCLUDEPATH += ../.. HEADERS += darken.h SOURCES += darken.cpp target.path += ../../plugins INSTALLS += target CONFIG += static
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The changes to the application can be divided into three parts. First you must add the library to the project file so it is linked to the application when the executable is built. Listing 11-27 shows the project file for the application. The highlighted line adds a reference to the statically linked library using the L command line option for adding a search path for libraries and the l option for adding a library reference. The search path added is dependent on the platform used to build the library. Listing 11-27. The application project file with a reference to a statically linked plugin TEMPLATE = app TARGET = DEPENDPATH += . INCLUDEPATH += . # Input HEADERS += filterdialog.h filterinterface.h FORMS += filterdialog.ui SOURCES += filterdialog.cpp main.cpp win32:LIBS += -L./filters/darken/release/ -ldarken !win32:LIBS += -L./filters/darken -ldarken
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Second, make sure that the QPluginLoader can still find the plugin, even if it is statically linked to the application, by adding the line shown in Listing 11-28. Notice that the macro Q_IMPORT_PLUGIN expects the class name with lowercase characters, not the actual class name. This is the string given as the first argument to the Q_EXPORT_PLUGIN2 macro in the plugin source code. Listing 11-28. The QPluginLoader is notified of the existence of the statically linked Darken plugin. Q_IMPORT_PLUGIN( darken ) int main( int argc, char **argv ) { ... } The third and last change to the application is in the findFilters method in the FilterDialog class. The updated version of the method is shown in Listing 11-29. The highlighted line shows the call to the QPluginLoader::staticInstances method, which returns QObject pointers to all the statically linked plugins. Pointers can then be cast to FilterInterface pointers using qobject_cast; if the cast operation does not return null, a filter has been found. Compared with loading plugins dynamically, the steps to find a file and load it have been replaced by the staticInstances call. This is an obvious change since the plugin is included in the application s executable file, so there is no external file to look for or load. Listing 11-29. Querying the QPluginLoader for statically linked filters void FilterDialog::findFilters() { foreach( QObject *couldBeFilter, QPluginLoader::staticInstances() ) { FilterInterface *filter = qobject_cast<FilterInterface*>( couldBeFilter ); if( filter ) { filters[ filter->name() ] = filter; ui.filterList->addItem( filter->name() ); } } QDir path( "./plugins" ); foreach( QString filename, path.entryList(QDir::Files) ) { QPluginLoader loader( path.absoluteFilePath( filename ) ); QObject *couldBeFilter = loader.instance(); if( couldBeFilter ) { FilterInterface *filter = qobject_cast<FilterInterface*>( couldBeFilter ); if( filter )
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CHAPTER 11 PLUGINS
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{ filters[ filter->name() ] = filter; ui.filterList->addItem( filter->name() ); } } } } The changes made to the application do not change the user s experience. In the example shown previously the only difference is that the Darken filter is always available, even if no plugins can be loaded. Notice that there were no changes made to the method actually using the filters, either. The filterChange method does not care how the plugin has been linked.
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