效果图：

菜单File的功能和工具条的功能一样。

主要功能：

1、获取系统时间和日期。

2、将界面的数据保存为txt文件。

3、播放背景音乐。

ui界面通过拖拽控件来实现，内部实现代码如下。

主要代码：

#include "mynote.h"
#include <QApplication>
#include <QSound>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QSound::play("music.wav");

    MyNote w;
    w.show();

    return a.exec();
}

/*mynote.h*/

#ifndef MYNOTE_H
#define MYNOTE_H

#include <QMainWindow>
#include <QDateEdit>
#include <QTimeEdit>
#include <QComboBox>
#include "aboutnote.h"

namespace Ui {
class MyNote;
}

class MyNote : public QMainWindow
{
    Q_OBJECT

public:
    explicit MyNote(QWidget *parent = 0);
    ~MyNote();

public:
    MyNote *newMyNote;
    AboutNote *aboutNote;

private slots:
    void on_actionNew_triggered();

    void on_actionExit_triggered();

    void on_actionAbout_Note_triggered();

    void on_actionAbout_Qt_triggered();

    void on_actionSave_triggered();

private:
    Ui::MyNote *ui;
};

#endif // MYNOTE_H

/*mynote.cpp*/

#include "mynote.h"
#include "ui_mynote.h"
#include "aboutnote.h"
#include <QSaveFile> //保存数据
#include <QString>
#include <QDebug>

#include <QSaveFile>//保存文件

#include <QFileDialog>

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

    QDate date = QDate(QDate::currentDate());
    ui->dateEdit->setDate(date);

    QTime time = QTime(QTime::currentTime());
    ui->timeEdit->setTime(time);

    ui->actionNew->setIcon(style()->standardIcon(QStyle::SP_DialogOpenButton));
    ui->actionSave->setIcon(style()->standardIcon(QStyle::SP_DialogSaveButton));
    ui->actionExit->setIcon(QIcon("quit.png"));
}

MyNote::~MyNote()
{
    delete ui;
}

void MyNote::on_actionNew_triggered()
{

    newMyNote = new MyNote;
    newMyNote->show();
}

void MyNote::on_actionExit_triggered()
{
    close();
}

void MyNote::on_actionAbout_Note_triggered()
{
    aboutNote = new AboutNote;
    aboutNote->setModal(true);
    aboutNote->show();
}

void MyNote::on_actionAbout_Qt_triggered()
{
    QApplication::aboutQt();
}

void MyNote::on_actionSave_triggered()  //保存数据
{
    QString fileName = QFileDialog::getSaveFileName(this,
            tr("保存 "),
            "",
            tr("保存类型 (*.txt)"));

    if (!fileName.isNull())
    {
        //fileName是文件名
        QFile file(fileName); //不弹出对话框，方法可行
        file.open(QIODevice::WriteOnly);

        QString text ;


        QTextStream infile(&file);

        text = ui->dateEdit->text();


        infile << "\r\n" << text << "\r\n";
        text.clear();


        text =  ui->timeEdit->text();
        infile << "\r\n" << text << "\r\n";
        text.clear();

        text =  ui->textEdit->toPlainText();
        text.replace(QString("\n"), QString("\r\n"));
        infile << "\r\n" << text << "\r\n";
        text.clear();

        file.close();
    }
    else
    {
        qDebug()<<"取消";
        //点的是取消
    }


    //  QFile file("test.txt"); //不弹出对话框，方法可行
    //  file.open(QIODevice::WriteOnly);
    //  QString text = ui->textEdit->toPlainText();
    //  text.replace(QString("\n"), QString("\r\n"));
    //  QTextStream infile(&file);
    //  infile << "\r\n" << text << "\r\n";
    //  file.close();
}

/*about.h*/

#ifndef ABOUTNOTE_H
#define ABOUTNOTE_H

#include <QDialog>

namespace Ui {
class AboutNote;
}

class AboutNote : public QDialog
{
    Q_OBJECT

public:
    explicit AboutNote(QWidget *parent = 0);
    ~AboutNote();

private:
    Ui::AboutNote *ui;
};

#endif // ABOUTNOTE_H

/*about.cpp*/

#include "aboutnote.h"
#include "ui_aboutnote.h"

AboutNote::AboutNote(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::AboutNote)
{
    ui->setupUi(this);
}

AboutNote::~AboutNote()
{
    delete ui;
}

源程序下载

地址：http://download.csdn.net/detail/rl529014/9562342