QT音乐播放器

QT功能十分强大，最重要的是跨平台移植性非常好，由于本人是学嵌入式的，所以做图形界面比较喜欢用QT，最近学习QT当做练习做了一个迷你版的音乐播放器，主要实现音乐播放、暂停、切换、音量大小调节，快进、添加和删除歌曲等基本功能，同时背景可以根据歌曲切换而切换，有歌词显示的功能，设计主界面主要如下：

整个QT项目下再放置三个文件夹，分别存放图片，歌词和歌曲文件。

images文件夹如下，有按钮图片，播放器的logo和歌曲的背景图片。

lrc文件夹如下，存放歌词文件，在网易云音乐和酷狗上获取歌词和歌曲的图片都很容易。

歌曲文件格式如下，当然这里将下载下来的歌词文件按照自己的格式改动了一下，大家可以按照自己的方式选择歌词的格式。

music文件夹如下，存放所有歌曲文件：

工程结构目录比较简单：

musicwidget.h代码如下：

#ifndef MUSICWIDGET_H#define MUSICWIDGET_H#include <QWidget>#include <QListWidget>#include <QMediaPlayer>#include <QTime>#include <QMouseEvent>#include <QKeyEvent>#include <QFont>#include <QTextStream>#include <QString>#include <QListWidgetItem>#include <QColor>#define MUSICLIST_MAXLEN 200#define MUSICLRC_MAXLEN 500namespace Ui {class MusicWidget;}class MusicWidget : public QWidget{Q_OBJECTpublic:explicit MusicWidget(QWidget *parent = 0);~MusicWidget();void musicPositionChange(qint64 position);void setWindowBackgroundImage();void mousePressEvent(QMouseEvent *e);void mouseMoveEvent(QMouseEvent *e);void mouseReleaseEvent(QMouseEvent *e);void keyPressEvent(QKeyEvent *e);private slots:void on_pb_addMusic_clicked();void on_lw_listMusic_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous);void on_pb_test_clicked();void on_slider_volume_valueChanged(int value);void on_slider_musicTime_valueChanged(int value);void on_pb_startOrPause_clicked();void on_lw_listMusic_doubleClicked(const QModelIndex &index);void on_pb_lastMusic_clicked();void on_pb_nextMusic_clicked();void on_pb_voice_clicked();void on_pb_close_clicked();void on_pb_minWindow_clicked();void on_lw_listMusic_entered(const QModelIndex &index);void on_lw_listMusic_pressed(const QModelIndex &index);void on_lw_listMusic_itemEntered(QListWidgetItem *item);void on_pb_delMusic_clicked();private:Ui::MusicWidget *ui;QString musicList[MUSICLIST_MAXLEN];QString musicLrc[MUSICLRC_MAXLEN];QString currentMusicName;int musicListCounter;int musicLrcLineCounter;int lrcAddLineCounter;int musicVolume_last;int musicVolume_now;QPoint startRelativePos;QMediaPlayer player;int playFlag;bool musicPositionChangeFlag;bool musicStartFlag;bool voiceOpenFlag;};#endif // MUSICWIDGET_H

musicwidget.c代码如下：

#include "musicwidget.h"#include "ui_musicwidget.h"#include <QFileDialog>#include <QFileInfo>#include <QDebug>MusicWidget::MusicWidget(QWidget *parent) :QWidget(parent),ui(new Ui::MusicWidget){ui->setupUi(this);setFixedSize(this->width(), this->height());musicListCounter = 0; //初始化音乐列表为空musicLrcLineCounter = 0; //初始化歌词列表为空musicVolume_now = musicVolume_last = 30; //音量为30playFlag = 0;musicPositionChangeFlag = false;musicStartFlag = false;voiceOpenFlag = true; //初始时声音是开的player.setVolume(30);ui->slider_volume->setValue(30);ui->pb_startOrPause->setIcon(QIcon("images/bfzn_004.png" ));ui->pb_startOrPause->setFixedSize(40, 40);ui->pb_voice->setIcon(QIcon("images/voice_open.png" ));ui->pb_voice->setFixedSize(16, 16);ui->pb_test->hide();//ui->pb_close->setStyleSheet("color:red"); //设置按钮的字体颜色为红色connect(&player, &QMediaPlayer::positionChanged, this, &MusicWidget::musicPositionChange);setWindowFlags(Qt::FramelessWindowHint);//无边框//setAttribute(Qt::WA_TranslucentBackground);//背景透明//设置窗体背景//QPixmap pixmap = QPixmap("F:/QTProject/MusicBox/images/岑宁儿 - 追光者.png").scaled(this->size());QPixmap pixmap = QPixmap("images/start.png").scaled(this->size());QPalette palette (this->palette());palette.setBrush(QPalette::Background, QBrush(pixmap));this-> setPalette( palette );//设置歌曲列表控件的透明度this->ui->lw_listMusic->setStyleSheet(QString("color:rgba(255,255,255,255);background-color:rgba(10,10,10,150)"));//设置歌词列表控件的透明度this->ui->lw_Lyric->setStyleSheet(QString("color:rgba(255,255,255,255);background-color:rgba(10,10,10,200)"));}MusicWidget::~MusicWidget(){delete ui;}//鼠标按下void MusicWidget::mousePressEvent(QMouseEvent *e){if(e->buttons() == Qt::LeftButton)startRelativePos = e->pos();}//鼠标移动void MusicWidget::mouseMoveEvent(QMouseEvent *e){if(startRelativePos.y() < 40 && startRelativePos.x() < 700) //只有在窗口上部分才能拖动窗口if (e->buttons() & Qt::LeftButton)move(e->globalPos() - startRelativePos);}//鼠标松开void MusicWidget::mouseReleaseEvent(QMouseEvent *e){e->accept();}void MusicWidget::musicPositionChange(qint64 position){qDebug() << "musicPositionChange" ;if(player.state() == QMediaPlayer::PlayingState){playFlag++;if(playFlag >= 2){qDebug() << "musicPositionChange->PlayingState" << QString::number(player.position()*100/player.duration());ui->slider_musicTime->setValue(player.position()*100/player.duration());musicPositionChangeFlag = true; //表明是该函数修改触发的事件QTime duration(0, player.position() / 60000, qRound((player.position() % 60000) / 1000.0), 0);ui->lb_musicTime->setText(duration.toString(tr("mm:ss")));QTime duration2(0, player.duration() / 60000, qRound((player.duration() % 60000) / 1000.0), 0);ui->lb_musicTime->setText(ui->lb_musicTime->text() + "/" + duration2.toString(tr("mm:ss")));//如果歌曲播放完毕if(duration == duration2){qDebug() << "Music Success" << "Next music->" << musicList[(ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter];//当前歌曲播放完了，自动切换下一首歌曲player.setMedia(QUrl::fromLocalFile(musicList[(ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter]));ui->lw_listMusic->setCurrentRow((ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter);player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();setWindowBackgroundImage();}if(musicLrc[0].compare(currentMusicName) != 0) //如果当前歌曲的歌词不在记录中，则重新载入相应的歌词{QFile lrcFile("lrc/" + ui->lw_listMusic->currentItem()->text() + ".txt");ui->lw_Lyric->clear();if(lrcFile.open(QIODevice::ReadOnly)) //打开文件成功{QTextStream lrcFileStream(&lrcFile);lrcFileStream.setCodec("UTF-8");musicLrcLineCounter = 0;musicLrc[musicLrcLineCounter++] = currentMusicName;while (!lrcFileStream.atEnd()) //按行把所有歌词读入到数组中{QString line = lrcFile.readLine();musicLrc[musicLrcLineCounter++] = line;}lrcFile.close();}else //找不到该歌曲的歌词文件{int currentMusicRow=0;ui->lw_Lyric->clear();lrcAddLineCounter = 0;for(int i=currentMusicRow-4; i<currentMusicRow+5; i++){if(i == currentMusicRow){ui->lw_Lyric->addItem("当前歌曲无歌词");}else{ui->lw_Lyric->addItem("");}lrcAddLineCounter++;ui->lw_Lyric->setCurrentRow(lrcAddLineCounter-1);ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);if(i == currentMusicRow){QFont font;font.setPointSize(18);ui->lw_Lyric->setCurrentRow(4);ui->lw_Lyric->currentItem()->setFont(font);ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);ui->lw_Lyric->currentItem()->setTextColor(Qt::darkGreen);//ui->lw_Lyric->currentItem()->setBackgroundColor(QColor(255,255,255,150));}}}}else //显示歌词{int currentMusicRow=0;for(currentMusicRow=0; currentMusicRow < musicLrcLineCounter; currentMusicRow++) //在歌词数组中找到当前时间点的那一行歌词{QString mm,ss;mm = musicLrc[currentMusicRow].mid(1, 2);ss = musicLrc[currentMusicRow].mid(4, 2);QTime duration3(0, mm.toInt(), ss.toInt(), 0);if(duration3 == duration) //如果找到与当前时间对应的歌词{break;}}if(currentMusicRow < musicLrcLineCounter) //如果找到了对应歌词{ui->lw_Lyric->clear();lrcAddLineCounter = 0;for(int i=currentMusicRow-4; i<currentMusicRow+5; i++){if(i >= 0 && i < musicLrcLineCounter){QStringList lrc = musicLrc[i].split("]");if(lrc.count() == 2)ui->lw_Lyric->addItem(lrc.at(1));elseui->lw_Lyric->addItem(musicLrc[i]);//ui->lw_Lyric->addItem(musicLrc[i]);lrcAddLineCounter++;ui->lw_Lyric->setCurrentRow(lrcAddLineCounter-1);ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);}else{ui->lw_Lyric->addItem("");lrcAddLineCounter++;ui->lw_Lyric->setCurrentRow(lrcAddLineCounter-1);ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);}if(i == currentMusicRow){QFont font;font.setPointSize(18);ui->lw_Lyric->setCurrentRow(4);ui->lw_Lyric->currentItem()->setFont(font);ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);ui->lw_Lyric->currentItem()->setTextColor(Qt::darkGreen);//ui->lw_Lyric->currentItem()->setBackgroundColor(QColor(255,255,255,150));}}}}ui->lw_Lyric->setCurrentRow(-1); //取消歌词列表的选中状态}}else{playFlag = 0;}}void MusicWidget::on_pb_addMusic_clicked(){bool hasSameItem = false;//QStringList path = QFileDialog::getOpenFileNames(this, "选择音乐文件", "E:\\CloudMusic");QStringList path = QFileDialog::getOpenFileNames(this, "选择音乐文件", "./music");for(int i=0; i<path.count(); i++) //逐条添加歌曲到歌曲列表中{hasSameItem = false;for(int j=0; j<musicListCounter; j++) //寻找是否有相同的地址的歌曲{if(musicList[j].compare(path.at(i)) == 0){hasSameItem = true;break;}}if(hasSameItem == false) //歌曲不重复则可以被添加进来{musicList[musicListCounter++] = path.at(i); //把选取的每条信息加入记录列表QFileInfo info(path.at(i));ui->lw_listMusic->addItem(info.baseName()); //将路径转化为文件名}}}void MusicWidget::on_pb_delMusic_clicked(){for(int i = ui->lw_listMusic->currentIndex().row(); i < musicListCounter-1; i++){musicList[i] = musicList[i+1];}musicListCounter--;ui->lw_listMusic->takeItem(ui->lw_listMusic->currentIndex().row());qDebug() << "current:" << QString::number(ui->lw_listMusic->currentIndex().row());}void MusicWidget::on_lw_listMusic_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous){qDebug() << "current:" << current->text() << QString::number(ui->lw_listMusic->currentIndex().row());}void MusicWidget::setWindowBackgroundImage(){//设置窗体背景QPixmap pixmap = QPixmap("images/" + ui->lw_listMusic->currentItem()->text() + ".png"); //加载背景图片if(pixmap.isNull() == false) //能找到当前歌曲的背景图片{pixmap = pixmap.scaled(this->width(), this->height()); //调整图片大小拉伸自动适应窗口QPalette palette (this->palette());palette.setBrush(QPalette::Background, QBrush(pixmap));this-> setPalette( palette );}else //不能找到当前歌曲的背景图片，设置一个默认的背景图片{QPixmap pixmap = QPixmap("images/start.png"); //加载背景图片pixmap = pixmap.scaled(this->width(), this->height()); //调整图片大小拉伸自动适应窗口QPalette palette (this->palette());palette.setBrush(QPalette::Background, QBrush(pixmap));this-> setPalette( palette );}}void MusicWidget::on_pb_test_clicked(){/*ui->lb_musicTime->setText(QString::number( player.duration()));qDebug() << "duration:" << QString::number( player.duration()) << ", position:" << QString::number( player.position());ui->slider_musicTime->setValue(player.position()/player.duration());QTime duration(0, player.position() / 60000, qRound((player.position() % 60000) / 1000.0), 0);ui->lb_musicTime->setText(duration.toString(tr("mm:ss")));*/QFont font;font.setPixelSize(25);ui->lw_listMusic->currentItem()->setFont(font);//ui->lw_listMusic->setStyleSheet("background-color:blue;");QFile lrcFile("lrc/岑宁儿 - 追光者.txt");if(!lrcFile.open(QIODevice::ReadOnly)) //打开文件失败{return;}QTextStream lrcFileStream(&lrcFile);lrcFileStream.setCodec("UTF-8");while (!lrcFileStream.atEnd()){QString line = lrcFile.readLine();line = line + "\n";}lrcFile.close();}void MusicWidget::on_slider_volume_valueChanged(int value){qDebug() << QString::number(ui->slider_volume->value()) << "," << QString::number(value);player.setVolume(value);if(musicVolume_now != value){musicVolume_last = musicVolume_now;musicVolume_now = value;}if(value == 0){if(voiceOpenFlag == true){ui->pb_voice->setIcon(QIcon("images/voice_close.png" ));}voiceOpenFlag = false;}else{if(voiceOpenFlag == false){ui->pb_voice->setIcon(QIcon("images/voice_open.png" ));}voiceOpenFlag = true;}ui->lb_volume->setText(QString::number(value) + "%");}void MusicWidget::on_slider_musicTime_valueChanged(int value){if(musicPositionChangeFlag == false){if(musicStartFlag == true){player.pause();player.setPosition(value*player.duration()/100);player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();}else{player.setPosition(value*player.duration()/100);}}else{musicPositionChangeFlag = false;}}void MusicWidget::on_pb_startOrPause_clicked(){if(!musicStartFlag){ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));//ui->pb_startOrPause->setFixedSize(40, 40);musicStartFlag = true;//player.play();if(player.state() == QMediaPlayer::StoppedState){player.setMedia(QUrl::fromLocalFile(musicList[ui->lw_listMusic->currentIndex().row()]));setWindowBackgroundImage();}//if(player.state() != QMediaPlayer::PlayingState)player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();}else{ui->pb_startOrPause->setIcon(QIcon("images/bfzn_004.png" ));musicStartFlag = false;player.pause();}}void MusicWidget::on_lw_listMusic_doubleClicked(const QModelIndex &index){player.setMedia(QUrl::fromLocalFile(musicList[ui->lw_listMusic->currentIndex().row()]));player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();musicStartFlag = true;ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));setWindowBackgroundImage();}void MusicWidget::on_pb_lastMusic_clicked(){//切换上一首歌曲if(ui->lw_listMusic->currentIndex().row() - 1 >= 0){player.setMedia(QUrl::fromLocalFile(musicList[(ui->lw_listMusic->currentIndex().row() - 1) % musicListCounter]));ui->lw_listMusic->setCurrentRow((ui->lw_listMusic->currentIndex().row() - 1) % musicListCounter);}else{player.setMedia(QUrl::fromLocalFile(musicList[musicListCounter - 1]));ui->lw_listMusic->setCurrentRow(musicListCounter - 1);}player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();if(musicStartFlag == false){musicStartFlag = true;ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));}setWindowBackgroundImage();}void MusicWidget::on_pb_nextMusic_clicked(){//切换下一首歌曲player.setMedia(QUrl::fromLocalFile(musicList[(ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter]));ui->lw_listMusic->setCurrentRow((ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter);player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();if(musicStartFlag == false){musicStartFlag = true;ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));}setWindowBackgroundImage();}void MusicWidget::on_pb_voice_clicked(){if(voiceOpenFlag == false){ui->pb_voice->setIcon(QIcon("images/voice_open.png" ));ui->slider_volume->setValue(musicVolume_last);voiceOpenFlag = true;}else{ui->slider_volume->setValue(0);//on_slider_volume_valueChanged(0);ui->pb_voice->setIcon(QIcon("images/voice_close.png" ));voiceOpenFlag = false;}}void MusicWidget::on_pb_close_clicked(){this->close(); //关闭窗体}void MusicWidget::on_pb_minWindow_clicked(){this->showMinimized(); //最小化窗体}void MusicWidget::keyPressEvent(QKeyEvent *e){qDebug() << "keyPressEvent" << QString::number(e->key());if(e->key()==Qt::Key_Enter || e->key()==Qt::Key_Return) //如果在音乐列表按下回车键{qDebug() << "Key_Enter";if(ui->lw_listMusic->hasFocus()) //如果当前焦点在音乐列表上{player.setMedia(QUrl::fromLocalFile(musicList[ui->lw_listMusic->currentIndex().row()]));setWindowBackgroundImage();player.play();currentMusicName = ui->lw_listMusic->currentItem()->text();musicStartFlag = true;}}}void MusicWidget::on_lw_listMusic_entered(const QModelIndex &index){qDebug() << "enter";}void MusicWidget::on_lw_listMusic_pressed(const QModelIndex &index){qDebug() << "press";}void MusicWidget::on_lw_listMusic_itemEntered(QListWidgetItem *item){qDebug() << "itemEntered";}

总体运行结果如下：

代码下载链接：/download/qq_34254642/10917513

12月19日：

最近有一些朋友给我发消息说不能播放音乐或者是工程编译报错，我也经常逛CSDN查找资料，明白那种充满期待下载了别人的资源然后又用不了的心情，真的是一种非常糟糕的体验，针对以上问题的解决办法。

（1）工程不能编译：工程是QT5.6版本的，因为工程保留的编译配置是我本人电脑的配置，大家需要根据自己的实际情况改下配置。

（2）工程编译成功，界面也出来了，但是播放不了音乐或者报错提示如下：

DirectShowPlayerService::doRender: Unresolved error code 80040266

原因是Qt中的多媒体播放，底层是使用DirectShowPlayerService，所以安装一个DirectShow解码器，例如LAVFilters，就可以解决运行出错问题，这里我帮大家找到了下载地址http://files.1f0.de/lavf/LAVFilters-0.65.exe，下载安装就OK了，参考了下面这位朋友的博客/mmmmmmyy/article/details/81877233在此表示感谢。

（3）因为之前写这个播放器的时候刚学QT，代码水平也不是很高，所以会有一些BUG，有兴趣的大家可以继续改进，就当做一个参考就行了。

（4）知道大家在CSDN上下载资源要花C币，要么就是到某宝上代下，我下载资源的时候也想过如果作者给百度云或者gittub的链接该多好啊，所以，己所不欲勿施于人。上传个百度云的链接链接：/s/1R_7ZJX73Y4lHnxBzxNlqLg

提取码：7ncx