QCamera Ready，QImageCapture不同意

Question

我的代码如下。我已经对状态进行了多次检查，qDebug（）在评论中显示了这一点。我真的无法弄清楚这是失败的原因。

QCamera *camera = new QCamera();

camera->setCaptureMode(QCamera::CaptureStillImage);

camera->load();
camera->start();
camera->searchAndLock();

QCameraImageCapture *imageCapture = new QCameraImageCapture(camera);
imageCapture->setCaptureDestination(QCameraImageCapture::CaptureToFile);

imageCapture->capture("~/test.jpg");

qDebug() << camera->state();              // QCamera::ActiveStatus
qDebug() << camera->status();             // QCamera::LoadedStatus
qDebug() << camera->isAvailable();        // true
qDebug() << camera->errorString();        // ""
qDebug() << imageCapture->isAvailable();  // true
qDebug() << imageCapture->errorString();  // "Camera not ready"

camera->unlock();
camera->stop();

Answer 1

试试这个：

QCamera *camera;

QList<QByteArray> devices = QCamera::availableDevices();
if( devices.length()){
    camera = new QCamera(devices.at(0));
}else{
    qDebug() << "No camera found!";
}

必须使用有效设备初始化QCamera。