用QT制作本地视频播放器
用QT制作本地视频播放器
先创建一个Qwidget工程
在工程里第一行加上QT += core gui multimedia multimediawidgets sql
widget.H文件
#ifndef WIDGET_H
#define WIDGET_H
#include widget.cpp代码（main.cpp文件不用修改
#include "widget.h"
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
this->setWindowTitle("爱奇艺");
this->setWindowIcon(QIcon(":/ico/aqy.bmp"));
this->resize(QSize(700,500)); //设置Widget窗口初始大小
//创建数据库
db = QSqlDatabase::addDatabase("QSQLITE"); //添加sqlite驱动
db.setDatabaseName("my.db");
db.open();
QString mlist = "create table mlist(filename text,path text);";
db.exec(mlist);
//添加水平布局器和垂直布局器
QHBoxLayout *hbox_1 = new QHBoxLayout;
QHBoxLayout *hbox_2 = new QHBoxLayout;
QVBoxLayout *vbox = new QVBoxLayout;
//添加控件
list = new QListWidget(this);
Slider = new QSlider(Qt::Horizontal);
label = new QLabel(this);
video = new QVideoWidget(this);
//video->setMinimumSize(400,300);
list->setMaximumWidth(200);
this->setAutoFillBackground(true); //控制控件背景是否填充
video->setAutoFillBackground(true);
QPalette palette_1;
QPalette palette_2;
palette_1.setColor(QPalette::Background,QColor(0,0,0));
//palette_1.setBrush(QPalette::Background,QBrush(QPixmap(":/ico/13.jpg")));
palette_2.setBrush(QPalette::Background,QBrush(QPixmap(":/ico/aqi1.bmp")));
video->setPalette(palette_2);
this->setPalette(palette_1);
player = new QMediaPlayer(this);
//设置图片按钮
QIcon ico1(":/ico/china.png");
bt1 = new QPushButton(this);
bt1->setIcon(ico1);
bt1->setIconSize(QSize(50,50));
bt1->setFlat(true); //去掉按钮边框
bt1->setToolTip("添加文件"); //按钮标签
QIcon ico2(":/ico/zant.png");
bt2 = new QPushButton(this);
bt2->setIcon(ico2);
bt2->setIconSize(QSize(60,60));
bt2->setFlat(true);
bt2->setToolTip("暂停");
QIcon ico3(":/ico/bo.png");
bt3 = new QPushButton(this);
bt3->setIcon(ico3);
bt3->setIconSize(QSize(80,80));
bt3->setFlat(true); //去掉按钮边框
bt3->setToolTip("播放"); //按钮标签
QIcon ico4(":/ico/Trash.png");
bt4 = new QPushButton(this);
bt4->setIcon(ico4);
bt4->setIconSize(QSize(50,50));
bt4->setFlat(true);
bt4->setToolTip("删除文件");
hbox_1->addWidget(list);
hbox_1->addWidget(video);
hbox_2->addWidget(bt1); //把按钮放入布局器
hbox_2->addWidget(bt2);
hbox_2->addWidget(bt3);
hbox_2->addWidget(bt4);
hbox_2->addWidget(Slider);
hbox_2->addWidget(label);
vbox->addLayout(hbox_1);
vbox->addLayout(hbox_2);
this->setLayout(vbox); //把布局器贴到界面
Slider = new QSlider(Qt::Horizontal);//把进度条贴到界面
connect(bt1,SIGNAL(clicked(bool)),this,SLOT(List_file()));
connect(bt2,SIGNAL(clicked(bool)),this,SLOT(Pause()));
connect(bt3,SIGNAL(clicked(bool)),this,SLOT(Play()));
connect(bt4,SIGNAL(clicked(bool)),this,SLOT(Del_file()));
connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(updatePosition(qint64)));
connect(Slider,SIGNAL(sliderMoved(int)),this,SLOT(seekchange(int)));
//播放列表
QString sql = "select * from mlist;";
QSqlQuery query;
if( query.exec(sql)){
qDebug()<<"显示列表";
}
else{
qDebug()<<"显示失败";
}
while( query.next() ){
QString file_name =QString( query.value("filename").toString() ); //转换类型
list->addItem(file_name);
}
}
void Widget::List_file()
{
QString dirname = QFileDialog::getExistingDirectory();
//QString dirname = QFileDialog::getOpenFileName(); //打开文件对话框，获取打开的文件名
QDir dir(dirname); //定义QDir对象
QStringList filter; //设置过滤器
filter <<"*.mp3"<<"*.mp4"<<"*.flv"<<"*.avi";
/*
QList lst;
lst = dir.entryList(filter); //获取文件夹下的所有文件名
for(int i=0;iaddItem(lst.at(i));
qDebug()<
QList <QFileInfo> lst;
lst = dir.entryInfoList(filter);
for(int i=0;i<lst.size();i++){
list->addItem(lst.at(i).fileName());
QString name = lst.at(i).fileName();
QString path = lst.at(i).absoluteFilePath();
QString sql = QString("insert into mlist values('%1','%2');").arg(name).arg(path);
qDebug()<<sql;
QSqlQuery query;
if( query.exec(sql)){
qDebug()<<"插入数据库成功";
}
else{
qDebug()<<"插入数据库失败";
}
//qDebug()<
}
}
void Widget::Play()
{
QString filename;
//选择文件播放
QListWidgetItem* item = list->currentItem(); //获取当前item
name_file = item->text();
QString sql = QString("select * from mlist where filename='%1';").arg(name_file);
QSqlQuery query;
if(query.exec(sql)){
qDebug()<<"查询成功";
}
else {
qDebug()<<"查询失败";
}
if( query.next()){
qDebug()<<"登录成功";
filename = query.value("path").toString();
}
else{
qDebug()<<"登录失败";
}
player->setMedia(QUrl::fromLocalFile(filename));
qDebug()<<"name:"<<filename;
//显示视频
player->setVideoOutput(video);
video->show();
player->play();
/* if(flag==1){
player->pause();
flag=0;
}
else if(flag==0){
player->play();
flag=1;
}
//player->play();
//qDebug()<text();
*/
}
void Widget::Del_file()
{
QListWidgetItem* item = list->currentItem(); //获取当前item
name_file = item->text();
QString sql = QString("delete from mlist where filename='%1';").arg(name_file);
QSqlQuery query;
if(query.exec(sql)){
qDebug()<<"删除成功";
}
else {
qDebug()<<"删除失败";
}
delete item;
}
void Widget::Pause()
{
//停止
/* connect(bt2, SIGNAL(clicked()), video, SLOT(stop()));
connect(bt2, SIGNAL(stateChanged(QMediaPlayer::State)), this, SLOT(OnStateChanged(QMediaPlayer::State)));
bt2->setEnabled(false);
*/
if(player->state()==QMediaPlayer::PlayingState)
{
bt2->setToolTip("暂停");
player->pause();
}
else
{
bt2->setToolTip("开始");
player->play();
}
}
//窗口关闭弹窗
void Widget::closeEvent(QCloseEvent *event)
{
//event->ignore();
if(QMessageBox::question(this,tr("Quit"),tr("你确定要退出这个应用吗？"),QMessageBox::Yes,QMessageBox::No) == QMessageBox::Yes){
event->accept();
}
else {
event->ignore();
}
}
void Widget::Move(qint64 position)
{
this->Slider->setMaximum(player->duration()/1000);
this->Slider->setValue(position/1000);
qint64 moved = position;
QTime movetime(0,(moved/60000)%60,(moved/1000)%60);
this->label->setText(movetime.toString("mm:ss"));
}
void Widget::seekChange(int position) //---------拖动进度条
{
player->setPosition(position*1000);
int moved = position*1000;
QTime movetime(0,(moved/60000)%60,(moved/1000)%60);
this->label->setText(movetime.toString("mm:ss"));
}
Widget::~Widget()
{
}
运行成功后的界面