以下是一个基于Qt实现的视频播放器的完整源码：
#include <QMediaPlayer> #include <QMediaPlaylist> #include <QVideoWidget> #include <QFileDialog> #include <QVBoxLayout> #include <QHBoxLayout> #include <QPushButton> #include <QSlider> #include <QLabel> #include <QFileIconProvider> #include <QMessageBox> #include <QFileInfo> #include <QDebug> #include <QApplication> class VideoPlayer : public QWidget { Q_OBJECT public: VideoPlayer(QWidget *parent = nullptr) : QWidget(parent) { // 创建媒体播放器和视频展示窗口 mediaPlayer = new QMediaPlayer(this); videoWidget = new QVideoWidget(this); mediaPlayer->setVideoOutput(videoWidget); // 创建播放列表 playlist = new QMediaPlaylist(this); mediaPlayer->setPlaylist(playlist); // 创建控制按钮 playButton = new QPushButton(this); playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); connect(playButton, &QPushButton::clicked, this, &VideoPlayer::togglePlayback); stopButton = new QPushButton(this); stopButton->setIcon(style()->standardIcon(QStyle::SP_MediaStop)); connect(stopButton, &QPushButton::clicked, mediaPlayer, &QMediaPlayer::stop); // 创建进度条 positionSlider = new QSlider(Qt::Horizontal, this); positionSlider->setRange(0, 0); connect(positionSlider, &QSlider::sliderMoved, this, &VideoPlayer::setPosition); // 创建标签显示视频信息 infoLabel = new QLabel(this); infoLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Maximum); // 创建布局 QVBoxLayout *mainLayout = new QVBoxLayout; QHBoxLayout *controlLayout = new QHBoxLayout; controlLayout->addWidget(playButton); controlLayout->addWidget(stopButton); controlLayout->addWidget(positionSlider); mainLayout->addWidget(videoWidget); mainLayout->addWidget(infoLabel); mainLayout->addLayout(controlLayout); setLayout(mainLayout); } private slots: void openFile() { QStringList fileNames = QFileDialog::getOpenFileNames(this, "选择视频文件", QString(), "视频文件 (*.mp4 *.avi)"); if (!fileNames.isEmpty()) { foreach(const QString &fileName, fileNames) { QFileInfo fileInfo(fileName); if (fileInfo.exists() && fileInfo.isFile()) { playlist->addMedia(QUrl::fromLocalFile(fileName)); } else { QMessageBox::warning(this, "错误", QString("无法打开文件: %1").arg(fileName)); } } mediaPlayer->play(); } } void togglePlayback() { if (mediaPlayer->state() == QMediaPlayer::PlayingState) { mediaPlayer->pause(); } else { mediaPlayer->play(); } } void setPosition(int position) { mediaPlayer->setPosition(position); } void updatePosition(qint64 position) { positionSlider->setValue(position); } void updateDuration(qint64 duration) { positionSlider->setRange(0, duration); } void handleError() { QMessageBox::critical(this, "错误", QString("发生错误: %1").arg(mediaPlayer->errorString())); } private: QMediaPlayer *mediaPlayer; QVideoWidget *videoWidget; QMediaPlaylist *playlist; QPushButton *playButton; QPushButton *stopButton; QSlider *positionSlider; QLabel *infoLabel; }; int main(int argc, char *argv[]) { QApplication app(argc, argv); VideoPlayer player; player.setWindowTitle("视频播放器"); player.resize(640, 480); player.show(); return app.exec(); } #include "main.moc" 该视频播放器使用了QMediaPlayer、QMediaPlaylist和QVideoWidget等Qt类来实现视频播放功能。界面上有一个视频展示窗口、播放按钮、停止按钮和进度条。用户可以通过点击播放按钮来开始/暂停视频播放，通过点击停止按钮来停止视频播放，通过拖动进度条来调整视频播放位置。
使用方法：
在Qt项目中添加以上源码，例如将其保存为main.cpp。
编译并运行项目。
注意：这段代码使用的是Qt 5的C++ API，可能需要根据您的Qt版本进行适当调整。
