如何使用Qt相机进行放大/缩小？

QT += multimedia multimediawidgets

QCamera *camera = new QCamera;
camera->setCaptureMode(QCamera::CaptureStillImage);

QCameraViewfinder *viewfinder = new QCameraViewfinder;
camera->setViewfinder(viewfinder);

QSlider *zoomSlider = new QSlider(Qt::Horizontal);
zoomSlider->setRange(0, 100); // 设置放大/缩小的范围

connect(zoomSlider, &QSlider::valueChanged, camera, &QCamera::setZoom);

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(viewfinder);
layout->addWidget(zoomSlider);

QWidget *window = new QWidget;
window->setLayout(layout);
window->show();