捕获到缓冲 QT

Capture To Buffer QT

本文关键字：QT 缓冲      更新时间：2023-10-16

我正在尝试使用 QT 捕获图像，并将图像缓冲区写入 QBuffer 类的对象，而不是将其保存到文件中。

这是我到目前为止的代码： 

mBuffer->open(QBuffer::ReadWrite);
mCameraImageCapture->setCaptureDestination(QCameraImageCapture::CaptureToBuffer);
QImageEncoderSettings imageEncoderSettings;
imageEncoderSettings.setCodec("image/BMP");
mCameraImageCapture->setEncodingSettings(imageEncoderSettings);
mCamera->setCaptureMode(QCamera :: CaptureStillImage);
mCamera->start();
mCamera->searchAndLock();
mCamera->unlock();
mBuffer->close();

是否可以在不将其保存到文件的情况下将图像捕获到缓冲区中？

也许是这样的？

QApplication app(argc, argv);
QCamera *cam = new QCamera;
cam->setCaptureMode(QCamera::CaptureStillImage);
QCameraViewfinder *viewfinder = new QCameraViewfinder;
viewfinder->show();
QCameraImageCapture *cap = new QCameraImageCapture(cam);
cap->setCaptureDestination(QCameraImageCapture::CaptureToBuffer);
cam->setViewfinder(viewfinder);
QObject::connect(cap, &QCameraImageCapture::imageCaptured, [=] (int id, QImage img) {
    QByteArray buf;
    QBuffer buffer(&buf);
    buffer.open(QIODevice::WriteOnly);
    img.save(&buffer, "PNG");
});
QObject::connect(cap, &QCameraImageCapture::readyForCaptureChanged, [=] (bool state) {
   if(state == true) {
       cam->searchAndLock();
       cap->capture();
       cam->unlock();
   }
});
cam->start();
app.exec();
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