Qt5如何使用摄像头

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（DEMO代码）项目名称：myCamera

myCamera.pro

QT += multimediaQT += multimediawidgets

mycameradialog.h

#ifndef MYCAMERADIALOG_H#define MYCAMERADIALOG_H#include <QDialog>#include <QCamera>#include <QCameraViewfinder>#include <QCameraImageCapture>#include <QLabel>#include <QPushButton>class MyCameraDialog : public QDialog{    Q_OBJECTpublic:    MyCameraDialog(QWidget *parent = 0);    ~MyCameraDialog();private slots:    void captureBtnResponded();    void saveBtnResponded();    void exitBtnResponded();    void cameraImageCaptured(int id, QImage image);private:    // 系统摄像设备（摄像头）    QCamera *camera;    // 摄像取景器部件    QCameraViewfinder *cameraViewFinder;    // 截图部件    QCameraImageCapture *cameraImageCapture;    QPushButton *captureBtn;    QPushButton *saveBtn;    QPushButton *exitBtn;    QLabel *displayLabel;    void translateLanguage();};#endif // MYCAMERADIALOG_H

mycameradialog.cpp

#include "mycameradialog.h"#include <QHBoxLayout>#include <QVBoxLayout>MyCameraDialog::MyCameraDialog(QWidget *parent)    : QDialog(parent){    this->setFixedSize(700, 400);    camera = new QCamera();    cameraViewFinder = new QCameraViewfinder();    cameraImageCapture = new QCameraImageCapture(camera);    captureBtn = new QPushButton();    saveBtn = new QPushButton();    exitBtn = new QPushButton();    displayLabel = new QLabel();    displayLabel->setFixedSize(160, 120);    displayLabel->setScaledContents(true);    QVBoxLayout *rightLayout = new QVBoxLayout;    rightLayout->addWidget(displayLabel);    rightLayout->addStretch();    rightLayout->addWidget(captureBtn);    rightLayout->addWidget(saveBtn);    rightLayout->addWidget(exitBtn);    QHBoxLayout *mainLayout = new QHBoxLayout;    mainLayout->addWidget(cameraViewFinder);    mainLayout->addLayout(rightLayout);    connect(captureBtn, SIGNAL(clicked()), this, SLOT(captureBtnResponded()));    connect(saveBtn, SIGNAL(clicked()), this, SLOT(saveBtnResponded()));    connect(exitBtn, SIGNAL(clicked()), this, SLOT(exitBtnResponded()));    connect(cameraImageCapture, SIGNAL(imageCaptured(int,QImage)), this, SLOT(cameraImageCaptured(int,QImage)));    cameraImageCapture->setCaptureDestination(QCameraImageCapture::CaptureToFile);    camera->setCaptureMode(QCamera::CaptureStillImage);    camera->setViewfinder(cameraViewFinder);    camera->start();    this->setLayout(mainLayout);    this->translateLanguage();}MyCameraDialog::~MyCameraDialog(){}void MyCameraDialog::translateLanguage(){    this->setWindowTitle(tr("testCapture"));    captureBtn->setText(tr("capture"));    saveBtn->setText(tr("save"));    exitBtn->setText(tr("exit"));}void MyCameraDialog::captureBtnResponded(){    cameraImageCapture->capture();}void MyCameraDialog::saveBtnResponded(){    const QPixmap *pixmap = displayLabel->pixmap();    if(pixmap) {pixmap->save("D:/workspace/Qt_Project/test/camera/a.jpg");}}void MyCameraDialog::exitBtnResponded(){    camera->stop();    this->close();}void MyCameraDialog::cameraImageCaptured(int id, QImage image){    displayLabel->setPixmap(QPixmap::fromImage(image));}

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