我正在尝试使用QT捕获图像,然后将图像缓冲区写入QBuffer类的对象中,而不是将其保存到文件中。
到目前为止,这是我的代码:
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();
是否可以将图像捕获到缓冲区中而不将其保存到文件中?
最佳答案
也许是这样的吗?
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();