QFileDialog dialog;
QGridLayout *layout=qobject_cast<QGridLayout *>(dialog.layout());
layout->addWidget(new QLabel("Codec"),layout->rowCount(),0);
QComboBox *comboBox=new QComboBox;
comboBox->addItem("default");
layout->addWidget(comboBox,layout->rowCount()-1,1);
dialog.exec();
效果图如下: