QT_Creator_Camera

#include "mycamera.h" #include "ui_mycamera.h" #include <QDebug> #include <QDir> MyCamera::MyCamera(QWidget *parent) : QWidget(parent) , ui(new Ui::MyCamera) { ui->setupUi(this); //获取系统中可用的摄像头信息 QList<QCameraInfo> infos = QCameraInfo::availableCameras(); //显示到下拉列表 foreach(QCameraInfo info,infos){ qDebug()<<info.deviceName()<<info.description(); //把摄像头设备名加入列表 ui->comboBox->addItem(info.deviceName()); } ui->pushButton_stop->setEnabled(false); ui->pushButton_capture->setEnabled(false); } MyCamera::~MyCamera() { delete ui; } //开始 void MyCamera::on_pushButton_start_clicked() { //构造摄像头对象 ca = new QCamera(ui->comboBox->currentText().toUtf8(),this); //构造截屏对象 cap = new QCameraImageCapture(ca,this); //连接截屏信号和显示截屏图像的槽 QObject::connect(cap,&QCameraImageCapture::imageCaptured,this,&MyCamera::show_pic); #if 0 //使用父类对象构造显示窗口类 w = new QVideoWidget(ui->widget); #else w = new QCameraViewfinder(ui->widget); #endif //调整大小一致 w->resize(ui->widget->size()); //设置摄像头的显示窗口 ca->setViewfinder(w); w->show(); //启动摄像头 ca->start(); //禁止开始按钮 ui->pushButton_start->setEnabled(false); ui->pushButton_stop->setEnabled(true); ui->pushButton_capture->setEnabled(true); } //停止 void MyCamera::on_pushButton_stop_clicked() { //停止摄像头 ca->stop(); //隐藏显示窗口 w->hide(); //断开信号 QObject::disconnect(cap,&QCameraImageCapture::imageCaptured,this,&MyCamera::show_pic); delete w; delete cap; delete ca; ui->pushButton_start->setEnabled(true); ui->pushButton_stop->setEnabled(false); ui->pushButton_capture->setEnabled(false); } //截屏 void MyCamera::on_pushButton_capture_clicked() { cap->capture(); //不能立即显示图片 } //显示截屏图片 void MyCamera::show_pic(int id, const QImage &preview) { qDebug()<<id; //把QImage转换成QPixmap QPixmap pix = QPixmap::fromImage(preview); //保存图片 QString picpath = QString("./%1.jpg").arg(id); pix.save(picpath); //显示 pix = pix.scaled(ui->label->size()); ui->label->setPixmap(pix); }