Qt调用摄像头拍照（截图）

【实例简介】

【实例截图】

【核心代码】

#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);
    m_view = new MyView(this);
    imageCapture = new QCameraImageCapture(camera);

    //ui->ImageView->addWidget(viewfinder);
    ui->ImageView->addWidget(m_view);
    ui->ImageCapture->setScaledContents(true);

    //camera->setViewfinder(viewfinder);
    camera->setViewfinder(m_view);

    connect(imageCapture, SIGNAL(imageCaptured(int,QImage)), this, SLOT(displayImage(int,QImage)));

    connect(ui->buttonCapture, SIGNAL(clicked()), this, SLOT(captureImage()));
    connect(ui->buttonSave, SIGNAL(clicked()), this, SLOT(saveImage()));
    connect(ui->buttonQuit, SIGNAL(clicked()), qApp, SLOT(quit()));
    connect(ui->buttonStop,SIGNAL(clicked()),camera,SLOT(stop()));
    connect(ui->buttonStart,SIGNAL(clicked()),camera,SLOT(start()));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::captureImage()
{
    imageCapture->capture();
}

void MainWindow::displayImage(int , QImage image)
{
    QByteArray ba;
    QBuffer buffer(&ba);
    buffer.open(QIODevice::WriteOnly);
    image.save(&buffer,"jpg");
    ui->ImageCapture->setText(QString::number(ba.size()));
    QImage pic;
    pic.loadFromData(ba);
    ui->ImageCapture->setPixmap(QPixmap::fromImage(pic));
}

void MainWindow::saveImage()
{
    QString fileName=QFileDialog::getSaveFileName(this, tr("save file"), QDir::homePath(), tr("jpegfile(*.jpg)"));
        if(fileName.isEmpty()) {
        return;
    }
    const QPixmap* pixmap=ui->ImageCapture->pixmap();
    if(pixmap) {
        pixmap->save(fileName);
    }
}

【源码目录】

.
└── untitled
    ├── main.cpp
    ├── mainwindow.cpp
    ├── mainwindow.h
    ├── mainwindow.ui
    ├── myview.cpp
    ├── myview.h
    ├── untitled.pro
    ├── untitled.pro.user
    ├── untitled.pro.user.22
    └── untitled.pro.user.b66346c

1 directory, 10 files