Hands-On GUI Programming with C++ and Qt5

Writing C++ code for music players

To write the C++ code for music players, perform the following steps:

1. First and foremost, open up mainwindow.h and add the following headers:

#include <QMainWindow> 
#include <QDebug> 
#include <QFileDialog> 
#include <QMediaPlayer> 
#include <QMediaMetaData> 
#include <QTime> 

2. After that, add the player variable, which is a QMediaPlayer pointer. Then, declare the functions that we're going to define later:

private: 
   Ui::MainWindow *ui; 
   QMediaPlayer* player; public:   void stateChanged(QMediaPlayer::State state);   void positionChanged(qint64 position);

3. Next, open up mainwindow.cpp and initialize the player variable:

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ...