Qt学习—qt编写定时关机程序

来源：互联网发布：部落冲突地震数据编辑：程序博客网时间：2024/05/18 06:23

编写了一个简单的定时关机程序，软件界面如下。顺便记录一下所用的控件的一些简单的使用方法。程序中用到的控件主要是QLCDNumber(数码管控件)以及QSpinBox()(滚动框控件)。

通过system()调用系统的关机命令。需要包含头文件stdlib.h。此外涉及到数码管以及滚动框显示数字时，前缀“0”的显示和消隐的问题。以下是代码。

首先是main.cpp

#include <QtGui/QApplication>

#include "mainwindow.h"

#include <QTextCodec>

int main(int argc, char *argv[])

    QApplication a(argc, argv);

    //Qt文本的国际化显示

    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("GB18030"));

    QTextCodec::setCodecForLocale(QTextCodec::codecForName("GB18030"));

    QTextCodec::setCodecForTr(QTextCodec::codecForName("GB18030"));

    MainWindow w;

    w.show();

    return a.exec();

其次是mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QDebug>

#include <QMessageBox>

#include <stdlib.h>

#include <QTimer>

#include <QString>

#include <QByteArray>

#include <QSpinBox>

namespace Ui {

class MainWindow;

class MainWindow : public QMainWindow

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void slot_pushbutton_exec();

    void slot_pushbutton_cancel();

    void slot_count_down();

    void slot_set_hour();

    void slot_set_minute();

    void slot_set_second();

private:

    Ui::MainWindow *ui;

    QTimer timer;

    void init_sys();

};

#endif // MAINWINDOW_H

最后是mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

    ui->setupUi(this);

    init_sys();

    QObject::connect(ui->pushButton_exec,SIGNAL(clicked()),this,SLOT(slot_pushbutton_exec()));

    QObject::connect(ui->pushButton_cancel,SIGNAL(clicked()),this,SLOT(slot_pushbutton_cancel()));

    QObject::connect(&timer,SIGNAL(timeout()),this,SLOT(slot_count_down()));

    QObject::connect(ui->spinBox_hour,SIGNAL(valueChanged(int)),this,SLOT(slot_set_hour()));

    QObject::connect(ui->spinBox_minute,SIGNAL(valueChanged(int)),this,SLOT(slot_set_minute()));

    QObject::connect(ui->spinBox_second,SIGNAL(valueChanged(int)),this,SLOT(slot_set_second()));

MainWindow::~MainWindow()

    delete ui;

void MainWindow::init_sys()

    //初始化LCD显示器

    //注：display是重载函数，当希望显示09,08,07……等数字形式时

    //采用字符串形式，可以显示前缀“0”，数字型显示会自动忽略掉0

    ui->lcdNumber_hour->display("88");

    ui->lcdNumber_minute->display("88");

    ui->lcdNumber_second->display("88");

    //设置组合框文本内容的前缀

    ui->spinBox_hour->setPrefix("0");

    ui->spinBox_minute->setPrefix("0");

    ui->spinBox_second->setPrefix("0");

    //初始化组合框文本内容

    ui->spinBox_hour->setValue(0);

    ui->spinBox_minute->setValue(0);

    ui->spinBox_second->setValue(0);

    //停止定时器

    timer.stop();

void MainWindow::slot_pushbutton_exec()

    //以索引号模式判断用户做出的选择

    int index_model = ui->comboBox_model->currentIndex();

    int index_action = ui->comboBox_action->currentIndex();

    //以当前选项文本内容判断用户做出的选择

//    QString str_model = ui->comboBox_model->currentText();

//    QString str_action = ui->comboBox_action->currentText();

//    if(str_model = "设定时间")

    if(0==index_model)          //指定关机时间模式

        QString second = ui->spinBox_second->text();

        QString minute = ui->spinBox_minute->text();

        QString hour = ui->spinBox_hour->text();

        QString cmd = "at "+hour+":"+minute+":"+second+" ";

        switch(index_action)

        case 0:                 //关机指令

            cmd = cmd + "shutdown -s";

            break;

        case 1:                 //注销指令

            cmd = cmd + "shutdown -l";

            break;

        case 2:                 //重启指令

            cmd = cmd + "shutdown -r";

            break;

        //将QString类对象转换为char*类型

        char* ch;

        QByteArray ba = cmd.toLatin1();

        ch=ba.data();

        system(ch);     //执行shell命令

    else if(1==index_model)     //倒计时关机模式

        int delay = ui->spinBox_hour->value()*3600 +

                    ui->spinBox_minute->value()*60 +

                    ui->spinBox_second->value();

        QString cmd = "";

        switch(index_action)

        case 0:                 //关机指令

            cmd = "shutdown -s -t "+QString::number(delay);

            break;

        case 1:                 //注销指令

            cmd = "shutdown -l -t "+QString::number(delay);

            break;

        case 2:                 //重启指令

            cmd = "shutdown -r -t "+QString::number(delay);

            break;

        char* ch;

        QByteArray ba = cmd.toLatin1();

        ch=ba.data();

        system(ch);

        //当显示的数字的位数为一位时，需要加上前缀“0”,以达到09，08……的效果

        //当显示的数字为两位数时，则需要屏蔽掉前缀“0”。

        //设置LCD显示小时

        if(ui->spinBox_hour->value()<=9&&ui->spinBox_hour->value()>=0)

            ui->lcdNumber_hour->display("0"+QString::number(ui->spinBox_hour->value()));

        else

            ui->lcdNumber_hour->display(QString::number(ui->spinBox_hour->value()));

        //设置LCD显示分钟

        if(ui->spinBox_minute->value()<=9&&ui->spinBox_minute->value()>=0)

            ui->lcdNumber_minute->display("0"+QString::number(ui->spinBox_minute->value()));

        else

            ui->lcdNumber_minute->display(QString::number(ui->spinBox_minute->value()));

        //设置LCD显示秒

        if(ui->spinBox_second->value()<=9&&ui->spinBox_second->value()>=0)

            ui->lcdNumber_second->display("0"+QString::number(ui->spinBox_second->value()));

        else

            ui->lcdNumber_second->display(QString::number(ui->spinBox_second->value()));

        timer.start(1*1000);

void MainWindow::slot_pushbutton_cancel()

    system("shutdown -a");

    init_sys();

void MainWindow::slot_count_down()

    int hour = ui->lcdNumber_hour->value();

    int minute = ui->lcdNumber_minute->value();

    int second = ui->lcdNumber_second->value();

    second--;

    if(second<0)

        second = 59;

        minute--;

        if(minute<0)

            minute = 59;

            hour--;

            if(hour<0)

                hour = 0;

    if(hour<=9&&hour>=0)

        ui->lcdNumber_hour->display("0"+QString::number(hour));

    else

        ui->lcdNumber_hour->display(QString::number(hour));

    if(minute<=9&&minute>=0)

        ui->lcdNumber_minute->display("0"+QString::number(minute));

    else

        ui->lcdNumber_minute->display(QString::number(minute));

    if(second<=9&&second>=0)

        ui->lcdNumber_second->display("0"+QString::number(second));

    else

        ui->lcdNumber_second->display(QString::number(second));

void MainWindow::slot_set_hour()

    if(ui->spinBox_hour->value()>9)

        ui->spinBox_hour->setPrefix("");

    else

        ui->spinBox_hour->setPrefix("0");

void MainWindow::slot_set_minute()

    if(ui->spinBox_minute->value()>9)

        ui->spinBox_minute->setPrefix("");

    else

        ui->spinBox_minute->setPrefix("0");

void MainWindow::slot_set_second()

    if(ui->spinBox_second->value()>9)

        ui->spinBox_second->setPrefix("");

    else

        ui->spinBox_second->setPrefix("0");

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