[提问]各位大牛帮忙看看 QML无法嵌入App [复制链接]

int main(int argc, char *argv[]){    
          QApplication a(argc, argv);  
           MainWindow w;    
          QDeclarativeView *qmlView = new QDeclarativeView;  
           qmlView->setSource(QUrl::fromLocalFile("main.qml"));    
           QDockWidget *dock=new QDockWidget();  
           QWidget *widget = new QWidget();
             QVBoxLayout *layout = new QVBoxLayout(widget);  
            QPushButton *btn=new QPushButton("dfdf");  
           layout->addWidget(btn);    
          layout->addWidget(qmlView);  
           dock->setWidget(widget);  
           w.addDockWidget(Qt::LeftDockWidgetArea,dock);  
           //w.setCentralWidget(widget);  
            w.show();    
          return a.exec();
}
代码很简单如上所述，结果button出来了，用qml写的view却什么也没有显示，这是什么问题啊？？