QT实现年会抽奖小软件的示例代码

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QCoreApplication>
#include <QDesktopWidget>
#include <Qtimer>
#include <QPixmap>
#include <QSize>
#include "thread.h"
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT
    Thread *thread;
    QTimer *timer;
    QTimer *timer2;

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_startBtn_clicked();
    void time2out();
    void show_image();
    void on_ResetBtn_clicked();
    void on_selectCase_activated(const QString &arg1);

private:
    Ui::MainWindow *ui;
    void Init();
    void openTxtFile(QString name);
    void randomSelect();
    void clickStop();
    int g_val,index;
    bool start;
    QStringList strList_store0,strList;
    QImage *img;

    const QString txt_Dir = (QCoreApplication::applicationDirPath() + "/cfg/");
    QString pic_Dir = (QCoreApplication::applicationDirPath() + "/photo/");

};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QFileDialog"
#include "QMessageBox"
#include <QDebug>
#include <qmath.h>
#include <QtMath>
#include <QRandomGenerator>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    Init();
    thread = new Thread;
    timer2 = new QTimer(this);
    connect(timer2,SIGNAL(timeout()),this,SLOT(time2out()));
}
MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::Init(){
    int w = QApplication::desktop()->width();
    int h = QApplication::desktop()->height();
    this->setFixedSize(w,h);
    this->setwindowstate(Qt::WindowMaximized);
    this->setWindowTitle("幸运之星");
    this->setObjectName("mainWindow");
    this->setStyleSheet("#mainWindow{border-image:url(:/background/bg.jpg);}");

    start = false;
    ui->caseName->setText("活动之主题");
    ui->caseName->setStyleSheet("font-size:60px;font-weight:500;color:yellow");
    ui->name->setStyleSheet("font-size:60px;font-weight:500;color:yellow");
    ui->startBtn->setStyleSheet("background:#f0f;");
    ui->ResetBtn->setStyleSheet("background:#f0f;");
    ui->selectCase->setStyleSheet("background:#f0f;");
    QDir dir(txt_Dir);
    QStringList nameFilters;
    nameFilters<<"*.txt";
    QStringList fileList = dir.entryList(nameFilters,QDir::Files|QDir::Readable,QDir::Name);
    //qDebug()<<"len:"<<fileList.length();
    for (int i=0;i<fileList.length();i++) {
        QFileInfo f = fileList.at(i);
        //qDebug()<<"文件名:"<<f.fileName();
        if(f.fileName()!=nullptr)
        {
            openTxtFile(txt_Dir+f.fileName());
        }else{
            qDebug()<<"多个文件";
        }
    }
}
void MainWindow::openTxtFile(QString filename){

    QFile file(filename);//从文件目录读取JSON配置文件
    if(!file.open(QIODevice::ReadOnly))
    {
       QMessageBox::warning(this,"Error",QString::fromLocal8Bit("无法打开配置文件!"),QMessageBox::Close);
       return;
    }

    QList<QString> list;

    QString  l  = file.readAll();
    //qDebug()<<"内容:"<<l;
    strList_store0 = l.split("\r\n");
    strList = strList_store0;

}
void MainWindow::on_startBtn_clicked()
{
    if(!start)
    {
        ui->startBtn->setText("停止");
        start = true;
        timer2->start(50);
        thread->start();

    }else{
        ui->startBtn->setText("开始");
        start = false;
        clickStop();
    }
}
void MainWindow::randomSelect()
{
    int len;
    len= strList.length();
    if(len>1)
    {
        show_image();
    }
}
void MainWindow::show_image()
{
    img=new QImage; //新建一个image对象
    QString path2;
    int len =  strList.length();
    index = rand()%len;
    path2 = pic_Dir+strList.at(index)+".png";
    qDebug()<<"path2:"<<path2;
    img->load(path2); //将图像资源载入对象img，注意路径，可点进图片右键复制路径

    ui->image->setScaledContents(true);
    img->scaled(ui->image->size(),Qt::KeepAspectRatio);//Qt::SmoothTransfORMation
    ui->image->setPixmap(QPixmap::fromImage(*img));
    //val =  qrand()%(len);
    qDebug()<<"val:"<<index;

    ui->name->setText(strList.at(index));
    delete img;
}
//出结果
void MainWindow::clickStop()
{

    thread->terminate();
    timer2->stop();
    strList.removeAt(index);
    int list_Len = strList.length();
    if(list_Len<2)
    {
        qDebug()<<"val:"<<index;
        QMessageBox::warning(this,"Error",("请复位后再操作!"),QMessageBox::Close);
    }
}
//滚动
void MainWindow::time2out(){
    randomSelect();
}

void MainWindow::on_ResetBtn_clicked()
{
    strList = strList_store0;

}

void MainWindow::on_selectCase_activated(const QString &arg1)
{
    ui->caseName->setText(arg1);

}

class Thread : public QThread
{

Q_OBJECT
public:
   explicit Thread(QObject *parent = 0);
   void run();
signals:
   void show_image();
public slots:
};

void Thread::run()
{
    while(true)
    {
        emit show_image();
        usleep(100000);
    }

}