Qt調用攝像頭

Win32下QT5以上調用USB攝像頭小程序

Qt5中捨棄了phone模塊，加入了QMultiMedia模塊，代碼部分如下：
頭文件.h

#include <QMainWindow>
#include <QtMultimedia/QCamera>
#include <QtMultimediaWidgets/QCameraViewfinder>
#include<QtMultimedia/QCameraImageCapture>
#include <QFileDialog>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private:
    Ui::MainWindow *ui;
    QCamera *camera;
    QCameraViewfinder *viewfinder;
    QCameraImageCapture *imageCapture;
private slots:
void captureImage();
void displayImage(int,QImage);
void saveImage();
};

.cpp文件

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    camera=new QCamera(this);
    viewfinder=new QCameraViewfinder(this);
    imageCapture=new QCameraImageCapture(camera);
    ui->horizontalLayout_View->addWidget(viewfinder);
    ui->label_Display->setScaledContents(true);
    camera->setViewfinder(viewfinder);
    camera->start();
    connect(imageCapture, SIGNAL(imageCaptured(int,QImage)), this,SLOT(displayImage(int,QImage)));
    connect(ui->pushButton_Capture, SIGNAL(clicked()), this, SLOT(captureImage()));
    connect(ui->pushButton_Save, SIGNAL(clicked()), this, SLOT(saveImage()));
    connect(ui->pushButton_Quit, SIGNAL(clicked()), qApp, SLOT(quit()));
}

MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::captureImage()
{
ui->statusBar->showMessage(tr("正在捕獲圖片"), 1000);
imageCapture->capture();
}
void MainWindow::displayImage(int , QImage image)
{
ui->label_Display->setPixmap(QPixmap::fromImage(image));
ui->statusBar->showMessage(tr("捕獲成功"), 5000);
}

void MainWindow::saveImage()
{
   QString fileName=QFileDialog::getSaveFileName(this, "Save", QDir::homePath(),"jpg");
    const QPixmap* pixmap=ui->label_Display->pixmap();
    if(pixmap)
    {
        pixmap->save(fileName);
        ui->statusBar->showMessage("保存成功", 5000);
    }
}

效果如下：

部分內容參考http://blog.sina.com.cn/s/blog_74a7e56e0101bdcf.html