QTベースのカメラ呼び出し

QCamera:システムカメラ
QCameraViewfinder:ビューファインダーコンポーネント
QCameraImageCapture:スクリーンショットコンポーネント
widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

public slots:
    void ShowTheCapture();
    void SavePicture();
    void displayImage(int,QImage image);
private:
    Ui::Widget *ui;
public:
    QCamera *camera;// 
    QCameraViewfinder * viewfinder;// 
    QCameraImageCapture * imageCapture;// 
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);


    camera=new QCamera;// 
    viewfinder=new QCameraViewfinder(this);
    imageCapture=new QCameraImageCapture(camera);// 
    camera->setViewfinder(viewfinder);

    QObject::connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(ShowTheCapture()));
    QObject::connect(ui->SaveButton,SIGNAL(clicked()),this,SLOT(SavePicture()));
    QObject::connect(imageCapture, SIGNAL(imageCaptured(int,QImage)), this, SLOT(displayImage(int,QImage)));
    imageCapture->setCaptureDestination(QCameraImageCapture::CaptureToFile);
    camera->setCaptureMode(QCamera::CaptureStillImage);
    camera->setViewfinder(viewfinder);
    camera->start(); // 
}
Widget::~Widget()
{
    delete ui;
}

void Widget::ShowTheCapture()
{
    imageCapture->capture();
}
void Widget::displayImage(int ,QImage image)
{
    //QImage image1(ui->label->x(),ui->label->y(),QImage::Format_RGB888);
   // image=new QImage(220,220,QImage::Format_RGB888);
   // image.setPixel(,Format_RGB888);
   // QColor color(QImage::Format_RGB888);
   // image.fill(color);
    //QImage image2;
    //QImage::Format format =  image1.format();
    //qDebug() << (int)format;
    image=image.convertToFormat(QImage::Format_RGB888);
    ui->label->setPixmap(QPixmap::fromImage(image));
    QImage::Format format =  image.format();
    qDebug() << (int)format;

}
void Widget::SavePicture()
{
    const QPixmap *pixmap = ui->label->pixmap();
    if(pixmap)
    {
         pixmap->save("E:\\hallo.jpg");
         qDebug()<