进度条以及多线程的使用

1.设置了进度条
2.使用了多线程

#include "processwidget.h"
#include "ui_processwidget.h"
#include <QTimer>
#include <QDebug>
ProcessWidget::ProcessWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ProcessWidget)
{
    ui->setupUi(this);
    nStep  = 0;
    ptimer = new QTimer;
    connect(ptimer,SIGNAL(timeout()),this,SLOT(slot_updateProgress()));
   // ptimer->start(100);
   // myth = new MyThread;


    connect(&myth,SIGNAL(send(int)),this,SLOT(slot_getdata(int)));
    connect(this,&ProcessWidget::destroyed,this,&ProcessWidget::slot_close);
     myth.start();
}


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


void ProcessWidget::slot_updateProgress()
{
    if(nStep==100)
    {
        nStep = 0;
    }
    nStep ++;
    ui->progressBar->setValue(nStep);
    update();
}


void ProcessWidget::slot_getdata(int i)
{
    qDebug()<< __func__<<i<<endl;
    ui->lineEdit->setText(QString::number(i));
    ui->progressBar->setValue(i);
    ui->progressBar->update();
    ui->lineEdit->update();
}


void ProcessWidget::slot_close()
{


     myth.terminate();
     myth.wait();
     delete myth;
}

#include "mythread.h"






void MyThread::run()
{
    int j=0;
    int i = 0;


    for(i = 0;i<10;i++)
    {


        j++;
        emit this->send(j);
      QThread::msleep(1);


    }
}

#ifndef PROCESSWIDGET_H
#define PROCESSWIDGET_H
#include "mythread.h"
#include <QWidget>


namespace Ui {
class ProcessWidget;
}
class QTimer;


class ProcessWidget : public QWidget
{
    Q_OBJECT


public:
    ProcessWidget(QWidget *parent = 0);
    ~ProcessWidget();
   // void run();


private slots:
    void slot_updateProgress();
    void slot_getdata(int i);
    void slot_close();
private:
    Ui::ProcessWidget *ui;
    QTimer  * ptimer;
    int nStep;
    MyThread  myth;


};


#endif // PROCESSWIDGET_H

#ifndef MYTHREAD_H
#define MYTHREAD_H


#include <QThread>


class MyThread : public QThread
{
    Q_OBJECT
public:
     MyThread(QObject *parent = nullptr);
protected:
    void run();//overrid
signals:
void send(int j);
public slots:
};


#endif // MYTHREAD_H