QCamera的使用方法，包含截图并且保存图片等简单功能

#defineMAINWINDOW_H

#include

namespaceUi{

classMainWindow;

}

classQCamera;

classQCameraViewfinder;

classQCameraImageCapture;

classMainWindow:publicQMainWindow

{

Q_OBJECT

public:

explicitMainWindow(QWidget*parent=0);

~MainWindow();

privateslots:

voidcaptureImage();

voiddisplayImage(int,QImage);

voidsaveImage();

private:

Ui::MainWindow*ui;

QCamera*camera;

QCameraViewfinder*viewfinder;

QCameraImageCapture*imageCapture;

};

#endif//MAINWINDOW_H

(2)实现文件mainwindow.cpp

#include

#include

#include

#include

#include"mainwindow.h"

#include"ui_mainwindow.h"

MainWindow::MainWindow(QWidget*parent):

QMainWindow(parent),

ui(newUi::MainWindow)

{

ui->setupUi(this);

camera=newQCamera(this);

viewfinder=newQCameraViewfinder(this);

imageCapture=newQCameraImageCapture(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()

{

deleteui;

}

voidMainWindow::captureImage()

{

ui->statusBar->showMessage(tr("正在捕获图片"),1000);

imageCapture->capture();

}

voidMainWindow::displayImage(int,QImageimage)

{

ui->label_Display->setPixmap(QPixmap::fromImage(image));

ui->statusBar->showMessage(tr("捕获成功"),5000);

}

voidMainWindow::saveImage()

{

QStringfileName=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;

}

constQPixmap*pixmap=ui->label_Display->pixmap();

if(pixmap){

pixmap->save(fileName);

ui->statusBar->showMessage(tr("保存成功"),5000);

}

}