QCamera就緒，QImageCapture不同意

Question

我的代碼如下。我對狀態進行了多次檢查，這在qDebug（）的註釋中顯示。我真的不知道這是失敗的。

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

試試這個：

QCamera *camera; 

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

式Qcamera必須使用有效的設備進行初始化。