用qt5写的视频播放器

#include "mainwindow.h" #include "ui_mainwindow.h" #include<QPixmap> #include<QFrame> #include<QHBoxLayout> #include<QFileDialog> #include<QString> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); Init(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::Init() { //设置主界面背景 QPixmap pixmap(":/image/background.jpg");//设定图片 QPalette palette;//创建一个调色板对象 palette.setBrush(backgroundRole(),QBrush(pixmap));//用调色板的画笔把映射到pixmap上的图片画到frame.backgroundRole()这个背景上 setPalette(palette);//设置窗口调色板为palette，窗口和画笔相关联 setAutoFillBackground(true);//设置窗体自动填充背景 this->setWindowTitle(QString::fromLocal8Bit("视频播放器")); this->setWindowIcon(QIcon(":/image/icon.png"));//设置窗体图标 //创建mediaPlayer mediaPlayer = new QMediaPlayer(this); //设置mediaPlayer的QVideoWidget播放窗口 mediaPlayer->setVideoOutput(ui->widget); //设置播放属性 //1 监听信号变化函数 connect(mediaPlayer,SIGNAL(stateChanged(QMediaPlayer::State)),this,SLOT(mediaStateChanged(QMediaPlayer::State))); //2 播放进度信号变化函数 connect(mediaPlayer,SIGNAL(positionChanged(qint64)),this,SLOT(positionChanged(qint64))); //3 播放长度信号变化 connect(mediaPlayer,SIGNAL(durationChanged(qint64)),this,SLOT(durationChanged(qint64))); //4 设置播放错误关联 connect(mediaPlayer,SIGNAL(error(QMediaPlayer::Error)),this,SLOT(handleError())); //设置播放按钮 ui->toolButton->setToolTip(QString::fromLocal8Bit("播放"));//设置鼠标点上去提示 //ui->toolButton->setAutoRaise(true); ui->toolButton->setIcon(QPixmap(":/image/play.png")); ui->toolButton->setIconSize(QSize(75,75)); //设置打开文件按钮 ui->toolButton_2->setToolTip(QString::fromLocal8Bit("打开文件")); ui->toolButton_2->setAutoRaise(true);//设置自动获取状态 ui->toolButton_2->setIcon(QPixmap(":/image/openfile.png")); ui->toolButton_2->setIconSize(QSize(75,75)); QHBoxLayout *hlayout = new QHBoxLayout(this); hlayout->addWidget(ui->toolButton); hlayout->addWidget(ui->horizontalSlider); hlayout->addWidget(ui->toolButton_2); } void MainWindow::play() { switch (mediaPlayer->state()) { case QMediaPlayer::PlayingState: mediaPlayer->pause(); break; default: mediaPlayer->play(); break; } } void MainWindow::on_toolButton_clicked() { play(); // ui->widget->show(); //设置播放按钮暂停样式 测试代码时候用 // ui->toolButton->setToolTip(QString::fromLocal8Bit("暂停")); // ui->toolButton->setIcon(QPixmap(":/image/pause.jpg")); } void MainWindow::mediaStateChanged(QMediaPlayer::State state) { //mediaPlayer播放过程中动态调整播放进度 switch (state) { case QMediaPlayer::PlayingState: ui->toolButton->setToolTip(QString::fromLocal8Bit("暂停")); ui->toolButton->setIcon(QPixmap(":/image/pause.jpg")); break; default: ui->toolButton->setToolTip(QString::fromLocal8Bit("播放")); ui->toolButton->setIcon(QPixmap(":/image/play.png")); break; } } void MainWindow::positionChanged(qint64 position) { //改变播放位置 ui->horizontalSlider->setValue(position); } void MainWindow::setPosition(int position) { //获取mediaPlayer进度条调整位置 mediaPlayer->setPosition(position); } void MainWindow::durationChanged(qint64 duration) { //获取进度条的范围 ui->horizontalSlider->setRange(0,duration); } void MainWindow::on_horizontalSlider_sliderMoved(int position) { setPosition(position); } void MainWindow::handleError() { ui->toolButton->setEnabled(false); } void MainWindow::on_toolButton_2_clicked() { QString filename = QFileDialog::getOpenFileName(this,QString::fromLocal8Bit("打开视频"),"G:/",tr("*.wmv *.avi")); //设置播放内容 mediaPlayer->setMedia(QUrl::fromLocalFile(filename)); ui->toolButton->setAutoRaise(true); }