// 保存
QSettings settings("Software Inc.", "Icon Editor");
settings.beginGroup("mainWindow");
settings.setValue("geometry", saveGeometry());
settings.setValue("state", saveState());
settings.endGroup();
// 恢复
QSettings settings("Software Inc.", "Icon Editor");
settings.beginGroup("mainWindow");
restoreGeometry(settings.value("geometry").toByteArray());
restoreState(settings.value("state").toByteArray());
settings.endGroup();