问题描述

求教 QT QVideoProbe有关问题

camera=new QCamera(this);
camera->setCaptureMode(QCamera::CaptureVideo);
viewfriend=new QCameraViewfinder(this);
viewfriend->setMinimumSize(200200);
viewfriend->move(00);
camera->start();
videoProbe=new QVideoProbe;
if(!videoProbe->setSource(camera))ui->statusBar->showMessage(""videoProbe not open"");
connect(videoProbeSIGNAL(videoFrameProbed(QVideoFrame))thisSLOT(showe(QVideoFrame)));
camera->setViewfinder(viewfriend);

    请问setSource(camera);返回false ，怎么回事啊？