Windows下Qt使用Usb摄像头采集视频实现鼠标事件

此程序为是在Windows下实现采集640*480的图像，并实现相应的鼠标事件

首先，在Qt Creator 中创建MainWindow,在创建的时候创建图形界面，在MainWindow.ui中使用垂直或是水平布局，改布局的名称为：ImageView

然后在MainWindow.h为

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QLabel>

#include <QStatusBar>

#include <QMouseEvent>

#include <QMainWindow>

#include <QCamera>

#include <QCameraViewfinder>

namespace Ui {

class MainWindow;

}

class QCamera;

class QCameraViewfinder;

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private:

    Ui::MainWindow *ui;

    QLabel *statusLabel;

    QLabel *MousePosLabel;

    QCamera *camera;

    QCameraViewfinder *viewfinder;

protected:

    void mousePressEvent(QMouseEvent *event);

    void mouseMoveEvent(QMouseEvent *event);

    void mouseReleaseEvent(QMouseEvent *event);

    void mouseDoubleClickEvent(QMouseEvent *event);

};

#endif // MAINWINDOW_H

相应的mainwindow.cpp为：

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include<QToolTip>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    camera=new QCamera(this);

    viewfinder=new QCameraViewfinder(this);

    ui->ImageView->addWidget(viewfinder);

    camera->setViewfinder(viewfinder);

    camera->start();

    setWindowTitle(tr("鼠标事件"));

    MousePosLabel = new QLabel;

    MousePosLabel -> setText(tr(" "));

    MousePosLabel -> setFixedWidth(100);

    this -> setMouseTracking(true);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::mousePressEvent(QMouseEvent *event)

{

    QString pStr("%1,%2");

    pStr = pStr.arg(event->pos().x()).arg(event->pos().y());

    QToolTip::showText(mapToGlobal(event->pos()) ,pStr);

    QPoint pos;

    qDebug()<<"x="<<event->x()<<" "<<"y="<<event->y();//局部

    pos = QCursor::pos();

    qDebug()<<"x:"<<pos.x()<<" "<<"y:"<<pos.y();//全局

    QPoint cur;

    if((event->pos().x()>640)||(event->pos().y()>480)||(event->pos().x()<0)||(event->pos().y()<0))

    {

        qDebug()<<"######";

        QCursor p;

        p.setPos(240,136);//回到中间位置

    }

}

void MainWindow::mouseMoveEvent(QMouseEvent *event)

{

    QString pStr("%1,%2");

    pStr = pStr.arg(event->pos().x()).arg(event->pos().y());

    QToolTip::showText(mapToGlobal(event->pos()) ,pStr);

    QPoint pos;

    qDebug()<<"x="<<event->x()<<" "<<"y="<<event->y();//局部

    pos = QCursor::pos();

    qDebug()<<"x:"<<pos.x()<<" "<<"y:"<<pos.y();//全局

    QPoint cur;

    if((event->pos().x()>640)||(event->pos().y()>480)||(event->pos().x()<0)||(event->pos().y()<0))

    {

        qDebug()<<"######";

        QCursor p;

        p.setPos(240,136);//回到中间位置

    }

//    MousePosLabel -> setText("("+QString::number(event -> x())+","+QString::number(event -> y())+")");

}

void MainWindow::mouseReleaseEvent(QMouseEvent *event)

{

    QString pStr("%1,%2");

    pStr = pStr.arg(event->pos().x()).arg(event->pos().y());

    QToolTip::showText(mapToGlobal(event->pos()) ,pStr);

    QPoint pos;

    qDebug()<<"x="<<event->x()<<" "<<"y="<<event->y();//局部

    pos = QCursor::pos();

    qDebug()<<"x:"<<pos.x()<<" "<<"y:"<<pos.y();//全局

    QPoint cur;

    if((event->pos().x()>640)||(event->pos().y()>480)||(event->pos().x()<0)||(event->pos().y()<0))

    {

        qDebug()<<"######";

        QCursor p;

        p.setPos(240,136);//回到中间位置

    }

}

void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)

{

    QString pStr("%1,%2");

    pStr = pStr.arg(event->pos().x()).arg(event->pos().y());

    QToolTip::showText(mapToGlobal(event->pos()) ,pStr);

    QPoint pos;

    qDebug()<<"x="<<event->x()<<" "<<"y="<<event->y();//局部

    pos = QCursor::pos();

    qDebug()<<"x:"<<pos.x()<<" "<<"y:"<<pos.y();//全局

    QPoint cur;

    if((event->pos().x()>640)||(event->pos().y()>480)||(event->pos().x()<0)||(event->pos().y()<0))

    {

        qDebug()<<"######";

        QCursor p;

        p.setPos(240,136);//回到中间位置

    }

}

main函数为：

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    MainWindow w;

    w.resize(640,480);

    w.show();

    return a.exec();

}

实现效果为：