编程练习：MP3播放器

功能介绍：

MP3播放器

构思过程：满足基本的播放要求（播放/暂停，快进，快退），带有歌词显示，标签显示，带曲目列表，支持中文

用到的工具（平台：Windows XP SP3）：

编程语言：C++

图标制作：Photo shop

音频文件标签库：mediaInfo（第三方库）

标签编码转换：sqlite3数据库及sqlite3 C++库（提前已经将对应的unicode和gbk编码用C++录入sqlite3数据库，过程如果遇到需要，则直接查表调用即可）

文件目录：

程序运行界面：

初始状态

添加多个文件状态

列表横向摆放

主要代码部分

/**功能： 音频播放器*作者： KAKASI (gongsunyongwu@163.com)*时间： 2014-6-1*版本： V1.0**/#include "musicPlayer.h"
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QGridLayout>
#include <QPixmap>
#include <QBitmap>
#include <QPainter>
#include <QIcon>
#include <QFile>
#include <QTextStream>
#include <QPushButton>
#include <QMediaMetaData>
#include <QDebug>
#include <QLibrary>
#include <stdio.h>
#include <QFileInfo>
#include <QFileDialog>
#include <QLocale>
#include <iostream>
#include <QByteArray>
#include <iostream>
#include <QByteArray>
#include <string.h>
#include <stdlib.h>
#include <locale.h>
#include <bitset>
#include <iomanip>
#include <QTextCodec>
#include "QMediaInfo.h"using namespace std;
#define cout qDebug()MusicPlayer::MusicPlayer(QWidget *parent):QWidget(parent)
{//some information initthis->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);isMouseDown = false;QPushButton *listBtn = new QPushButton("L");listBtn->setMaximumSize(20,20);connect(listBtn, SIGNAL(clicked()), SLOT(showList()));listBtn->setStyleSheet("background:gray");QPushButton *loadBtn = new QPushButton("O");loadBtn->setMaximumSize(20,20);connect(loadBtn, SIGNAL(clicked()), SLOT(loadMusics()));loadBtn->setStyleSheet("background:gray");QPushButton *minBtn = new QPushButton("-");minBtn->setMaximumSize(20,20);connect(minBtn, SIGNAL(clicked()), SLOT(setMin()));minBtn->setStyleSheet("background:gray");QPushButton *exitBtn = new QPushButton("X");exitBtn->setMaximumSize(30,20);connect(exitBtn, SIGNAL(clicked()),SLOT(close()));exitBtn->setStyleSheet("background:gray; text-align:top");QHBoxLayout *titleLayout = new QHBoxLayout;titleLayout->addStretch();titleLayout->addWidget(listBtn,0,Qt::AlignTop);titleLayout->addWidget(loadBtn,0,Qt::AlignTop);titleLayout->addWidget(minBtn,0,Qt::AlignTop);titleLayout->addWidget(exitBtn,0,Qt::AlignTop);titleLayout->setSpacing(0);titleLayout->setContentsMargins(0, 0, 0, 0);//layoutmusicNameLabel = new MyLabel();musicNameLabel->setMinimumWidth(200);musicNameLabel->setText("Take Me Away");musicNameLabel->setStyleSheet("font-size:23px; font-family: 隶书; color:white");authorLabel = new MyLabel();authorLabel->setText("Avril");authorLabel->setStyleSheet("font-size:14px; font-family:隶书; color:white");timeLabel = new MyLabel();totalTime = 302;timeLabel->setText(tr("T: <span style='color:Coral'>%1</span> / %2").arg(getTimeStr(0)).arg(getTimeStr(totalTime)));timeLabel->setStyleSheet("font-size:14px; font-family:隶书;color:white");volLabel = new MyLabel;volLabel->setText(tr("V:%1").arg("30%"));volLabel->setStyleSheet("font-size:14px; font-family:隶书; color:white");QHBoxLayout *timeAndVolLabel = new QHBoxLayout;timeAndVolLabel->addWidget(volLabel);timeAndVolLabel->addStretch();timeAndVolLabel->addWidget(timeLabel);prevLabel = new MyLabel;playOrPauseLabel = new MyLabel;nextLabel = new MyLabel;connect(playOrPauseLabel, SIGNAL(clicked()), SLOT(playOrPause()));connect(nextLabel, SIGNAL(clicked()), SLOT(next()));connect(prevLabel, SIGNAL(clicked()), SLOT(prev()));QPixmap img1("images/prev3.png");QPixmap img2("images/play.png");QPixmap img3("images/next3.png");prevLabel->setPixmap(img1.scaled(40,40));playOrPauseLabel->setPixmap(img2.scaled(60,60));nextLabel->setPixmap(img3.scaled(40,40));prevLabel->resize(40,40);playOrPauseLabel->resize(60,60);nextLabel->resize(40,40);prevLabel->setStyleSheet("border-style:flat;");playOrPauseLabel->setStyleSheet("border-style:flat");nextLabel->setStyleSheet("border-style:flat");QString smallStyleStr = "width:40px; height:40px; ";QString bigStyleStr = "width:60px; height:60px; ";prevLabel->setStyleSheet(smallStyleStr);playOrPauseLabel->setStyleSheet(bigStyleStr);nextLabel->setStyleSheet(smallStyleStr);picLabel = new MyLabel();picLabel->resize(85,85);picLabel->setStyleSheet("margin-left:6px;margin-right:10px;");QPixmap pic("images/logo.png");picLabel->setPixmap(pic);QHBoxLayout *picLayout = new QHBoxLayout;picLayout->addWidget(picLabel);space = new MyLabel;space->setText("<hr>");currentLRC = new MyLabel("<center> </center>");currentLRC->setStyleSheet("font-size:25px; font-family:隶书;color:DeepSkyBlue;");nextLRC = new MyLabel("<center> </center>");nextLRC->setStyleSheet("font-size:15px; font-family:隶书; color:LightGrey;");progressSlider = new QSlider(Qt::Horizontal);progressSlider->setRange(0,totalTime);connect(progressSlider, SIGNAL(sliderMoved(int)), SLOT(setPosition(int)));connect(progressSlider, SIGNAL(sliderReleased()), SLOT(setPosition()));volSlider = new QSlider(Qt::Horizontal);volSlider->setRange(0,100);volSlider->setValue(30);connect(volSlider, SIGNAL(valueChanged(int)), SLOT(changeVol(int)));QFile file("qss/style1.qss");file.open(QFile::ReadOnly);volSlider->setStyleSheet(file.readAll());file.close();file.setFileName("qss/style2.qss");file.open(QFile::ReadOnly);progressSlider->setStyleSheet(file.readAll());progressSlider->setMinimumWidth(240);QHBoxLayout *slider = new QHBoxLayout;slider->addWidget(volSlider);slider->addStretch();slider->addWidget(progressSlider);QVBoxLayout *midLayout = new QVBoxLayout();midLayout->addWidget(musicNameLabel);midLayout->addWidget(authorLabel);midLayout->addLayout(timeAndVolLabel);QHBoxLayout *operationLayout = new QHBoxLayout();operationLayout->addWidget(prevLabel, 0,Qt::AlignRight);operationLayout->addWidget(playOrPauseLabel, 0, Qt::AlignRight);operationLayout->addWidget(nextLabel, 0, Qt::AlignRight);QHBoxLayout *topLayout = new QHBoxLayout;topLayout->addLayout(midLayout);topLayout->addLayout(operationLayout);QVBoxLayout *rightLayout = new QVBoxLayout;rightLayout->addLayout(topLayout);rightLayout->addLayout(slider);QVBoxLayout *lrcLayout = new QVBoxLayout;lrcLayout->addWidget(currentLRC);lrcLayout->addWidget(nextLRC);QHBoxLayout *mainLayout1 = new QHBoxLayout();mainLayout1->addLayout(picLayout);mainLayout1->addLayout(rightLayout);QVBoxLayout *mainLayout2 = new QVBoxLayout();mainLayout2->addLayout(titleLayout);mainLayout2->addLayout(mainLayout1);mainLayout2->addWidget(space);mainLayout2->addLayout(lrcLayout);mainLayout2->setSpacing(0);mainLayout2->setContentsMargins(5,0,15,15);this->setLayout(mainLayout2);this->resize(this->sizeHint()); //important for setRounded(bool)setAttribute(Qt::WA_TranslucentBackground, true);setRounded(true);isPlaying = false;listUi = 0;list = new QStringList;playerList = new QMediaPlaylist;playerList->setCurrentIndex(0);playerList->setPlaybackMode(QMediaPlaylist::Loop);player = new QMediaPlayer;player->setPlaylist(playerList);connect(player,SIGNAL(positionChanged(qint64)), SLOT(positionChange(qint64)));connect(player,SIGNAL(durationChanged(qint64)), SLOT(durationChange(qint64)));volSlider->setValue(player->volume());createActions();lrc = new QMap<int,QString>;updateInfo();
}void MusicPlayer::closeEvent(QCloseEvent *event)
{if (listUi != 0)listUi->close();event->accept();
}//显示曲目列表
void MusicPlayer::showList()
{if (listUi == 0){listUi = new MediaList(this->sizeHint(), this->pos(), this);listUi->show();return;}if (listUi->isHidden()){listUi->show();}else{listUi->hide();}
}//打开音频文件
void MusicPlayer::loadMusics()
{QStringList files = QFileDialog::getOpenFileNames(this,"Select one or more files to open","/home","musics (*.mp3 *.wma *.wav)");int begin = list->length();if (!files.isEmpty()){QString str;foreach (str, files){list->append(str);playerList->addMedia(QUrl::fromLocalFile(list->last()));}playerList->setCurrentIndex(begin);updateInfo();if (listUi == 0){listUi = new MediaList(this->sizeHint(), this->pos(), this);}if (listUi != 0){listUi->addFiles(files);}}//歌词初始化initLrc();player->play();QPixmap img(("images/pause.png"));playOrPauseLabel->setPixmap(img.scaled(60,60));
}//任意区域右键菜单
void MusicPlayer::contextMenuEvent(QContextMenuEvent *event)
{menu->clear();menu->addAction(openAction);menu->addAction(exitAction);menu->exec(QCursor::pos());event->accept();
}//
void MusicPlayer::createActions()
{menu = new QMenu(this);openAction = new QAction("open",this);exitAction = new QAction("exit",this);
}//更新界面信息
void MusicPlayer::updateInfo()
{QString title;QString author;QFileInfo f;if (!list->empty()){QString fileName = list->at(playerList->currentIndex());info = new QMediaInfo(fileName);f.setFile(fileName);if (f.suffix().toUpper() == "MP3"){title = info->getInfo("Title",true);author = info->getInfo("Performer",true);}else{title = info->getInfo("Title");author = info->getInfo("Performer");}title = f.baseName();//cout << title << author;delete info;}title.truncate(8);if (title.length() > 8)title += "..";if (title.isEmpty())title = "Title:Unknown";if (author.isEmpty())author = "Author:Unknown";musicNameLabel->setText(title);authorLabel->setText(author);curLrc = "";nextLrcStr = "";currentLRC->setText("<center>" + curLrc +"</center>");nextLRC->setText("<center>" + nextLrcStr +"</center>");//歌词初始化initLrc();
}//下一首
void MusicPlayer::next()
{playerList->next();//qDebug()<<playerList->currentIndex();updateInfo();//歌词初始化initLrc();
}//上一首
void MusicPlayer::prev()
{playerList->previous();updateInfo();//歌词初始化initLrc();
}//时间更新
void MusicPlayer::durationChange(qint64 duration)
{totalTime = duration;progressSlider->setRange(0, duration);timeLabel->setText(tr("T: <span style='color:Coral'>%1</span> / %2").arg(getTimeStr(0)).arg(getTimeStr(totalTime)));
}//进度更新
void MusicPlayer::positionChange(qint64 pos)
{if (!progressSlider->isSliderDown())progressSlider->setValue(pos);timeLabel->setText(tr("T: <span style='color:Coral'>%1</span> / %2").arg(getTimeStr(pos)).arg(getTimeStr(totalTime)));//更新歌词显示getTimeStr(pos)if (lrc->empty())return;int key = pos / 1000;QMap<int, QString>::iterator it;if (lrc->contains(key)){curLrc = lrc->value(key);it = lrc->find(key);if (it++ != lrc->end()){nextLrcStr = it.value();}}curLrc = curLrc.trimmed();curLrc.truncate(15);if (curLrc.length() > 15)curLrc += "...";nextLrcStr = nextLrcStr.trimmed();nextLrcStr.truncate(15);if(nextLrcStr.length() > 15)nextLrcStr += "...";currentLRC->setText("<center>" + curLrc +"</center>");nextLRC->setText("<center>" + nextLrcStr +"</center>");//cout << pos << curLrc;}//初始化歌词
void MusicPlayer::initLrc()
{if (lrc != 0)lrc->clear();if (list == 0)return;curLrc = "";nextLrcStr = "";//思路，用一个map存储10-》string的格式，然后时间到后载入，等待下一个时间if (list->isEmpty())return ;if (playerList == 0)return;QString fileNames = list->at(playerList->currentIndex());QString lrcNames = fileNames;int n = lrcNames.lastIndexOf('.');lrcNames.replace(n,lrcNames.length() - n,".lrc");QFile file(lrcNames);QString line;if (file.open(QIODevice::ReadOnly | QIODevice::Text)){QTextStream stream(&file);while(!stream.atEnd()){line = stream.readLine();int num = line.count('[');int last = line.lastIndexOf(']');QString str = line.right(line.length() - last -1);int begin = 0;while(num-- >0){QString strs = line.mid(begin,10);begin += 10;strs.replace("[","");strs.replace("]","");int s = getSeconds(strs);if (s > 0){lrc->insert(s,str.trimmed());//cout << s << "=" << lrc->value(s);}}}}
}void MusicPlayer::setPosition(int pos)
{currentPos = pos;
}void MusicPlayer::setPosition()
{player->setPosition(currentPos);
}//play or pause
void MusicPlayer::playOrPause()
{QPixmap img(("images/play.png"));if (!isPlaying){isPlaying = true;player->play();img.load("images/pause.png");}else{isPlaying = false;player->pause();img.load("images/play.png");}playOrPauseLabel->setPixmap(img.scaled(60,60));
}//时间字符串00:00:00得到毫秒/秒，依赖操作系统
qint32 MusicPlayer::getSeconds(QString &timeStr)
{QStringList strs = timeStr.split(":");QString s;if (strs.size() > 0){int m = strs.at(0).toDouble();int s = strs.at(1).toDouble();//cout << "m" << m;//cout << "s" << s;return m * 60 + s;}return 0;
}//从时，分，秒获取总数秒
qint32 MusicPlayer::getSeconds(qint32 seconds_, qint32 minutes_, qint32 hours_)
{return seconds_ + minutes_ * 60 + hours_ * 3600;
}//从duuation获取字符串
QString MusicPlayer::getTimeStr(qint32 seconds_)
{seconds_ /= 1000;qint32 minutes = seconds_ % 3600 / 60;qint32 seconds = seconds_ % 3600 % 60;minutes = minutes > 99 ? 99 : minutes + 100;seconds = seconds + 100;return QString::number(minutes).right(2).append(":").append(QString::number(seconds).right(2));
}//改变时间提示
//void MusicPlayer::changeTime(qint64 time)
//{
//    timeLabel->setText(tr("T: <span style='color:Coral'>%1</span> / %2").arg(getTimeStr(time/1000)).arg(getTimeStr(totalTime)));
//}//最小
void MusicPlayer::setMin()
{if (!this->isMinimized()){this->showMinimized();}
}//改变音量提示
void MusicPlayer::changeVol(int vol)
{volLabel->setText(tr("V:%1%").arg(QString::number(vol)));player->setVolume(vol);
}//窗体透明程度
void MusicPlayer::paintEvent(QPaintEvent *event)
{QPainter painter(this);painter.fillRect(this->rect(), QColor(100, 100, 100, 255));  //QColor最后一个参数80代表背景的透明度
}//圆角窗体
void MusicPlayer::setRounded(bool b)
{if (!bmp){delete bmp;bmp = 0L;}if (!p){delete p;p = 0L;}bmp = new QBitmap(this->size());bmp->fill();             //fills the pixmap with white (default value) colorp = new QPainter(bmp);p->setPen(Qt::NoPen);p->setBrush(Qt::black);if (b)p->drawRoundedRect(bmp->rect(),15,15);elsep->drawRoundedRect(bmp->rect(),0,0);setMask(*bmp);//设置窗体遮罩
}//移动窗体相关
void MusicPlayer::mousePressEvent(QMouseEvent *event)
{if (event->button() == Qt::LeftButton){isMouseDown = true;oldLocation = event->globalPos() - this->pos();}event->ignore();
}
//移动窗体相关
void MusicPlayer::mouseMoveEvent(QMouseEvent *event)
{if (isMouseDown){this->move(event->globalPos() - oldLocation);if (listUi != 0){listUi->moves(this->sizeHint(), this->pos());}}event->ignore();
}
//移动窗体相关
void MusicPlayer::mouseReleaseEvent(QMouseEvent *event)
{isMouseDown = false;event->ignore();
}

（转载请注明作者和出处, 未经允许请勿用于商业用途）

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