Qt中动态和显示加在库的方法

 QString libpath=QString(HomePath)+QDir::separator()+"com_dll"+QDir::separator()+"plugins";
 QApplication::addLibraryPath ( libpath );

QDir pluginsDir = QDir(path);
//pluginsDir.cd("plugins");    
try
{
   QString fileName=name;//"MyPluginWidget.dll";
   QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
   QObject *plugin = loader.instance();

}