MainWindow.cpp

#include <QWidget>
#include <QCamera>
#include <QCameraViewfinder>
#include <QCameraImageCapture>
#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("正在捕获图片"), 1000);
imageCapture->capture();
}

void MainWindow::displayImage(int /*id*/, QImage image)
{
ui->label_Display->setPixmap(QPixmap::fromImage(image));
ui->statusBar->showMessage(tr("捕获成功"), 5000);
}

void MainWindow::saveImage()
{
QString fileName=QFileDialog::getSaveFileName(this, tr("保存到文件"), QDir::homePath(), tr("jpeg格式文件(*.jpg)"));
if(fileName.isEmpty()) {
ui->statusBar->showMessage(tr("保存操作已取消"), 5000);
return;
}
const QPixmap* pixmap=ui->label_Display->pixmap();
if(pixmap) {
pixmap->save(fileName);
ui->statusBar->showMessage(tr("保存成功"), 5000);
}
}