change progress bar value from a thread

[xbehzad]

hi every one.
i write this cod.
how i can change progress bar value from my thread?
signal and slots?
how use signal and slots for this program??


main.cpp

#include "mainwindow.h"
#include <QApplication>
#include <QThread>
#include <QDebug>
#include <mainwindow.h>
 
 
 
 
int i ;
 
 
 
 
 
 
 
 
 
 
 
 
 
class Thread : public QThread
{
private:
    void run()
    {
    for(i;i<=100;i++)
        QThread::sleep(1);
 
    }
 
};
 
 
 
 
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
 
 
//Thread();
 
 
 
 
 
      qDebug()<<"From main thread: "<<QThread::currentThreadId();
 
       Thread t;
       QObject::connect(&t, SIGNAL(finished()), &a, SLOT(quit()));
 
       t.start();
 
 
//--------------------
 
 
//---------------------------------------
 
 
 
 
 
 
 
 
    return a.exec();
 
}

#include "mainwindow.h"
#include <QApplication>
#include <QThread>
#include <QDebug>
#include <mainwindow.h>




int i ;













class Thread : public QThread
{
private:
    void run()
    {
    for(i;i<=100;i++)
        QThread::sleep(1);
    
    }
    
};





int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();



//Thread();





      qDebug()<<"From main thread: "<<QThread::currentThreadId();

       Thread t;
       QObject::connect(&t, SIGNAL(finished()), &a, SLOT(quit()));

       t.start();


//--------------------


//---------------------------------------








    return a.exec();

}

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mainwindow.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QApplication>
 
 
 
 
 
extern int i;
 
 
 
 
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
 
}
 
void MainWindow::on_pushButton_pressed()
{
 
   // ui->progressBar->setValue(i);
 
 
//ui->progressBar->update();
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QApplication>





extern int i;






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


}

MainWindow::~MainWindow()
{
    delete ui;

}

void MainWindow::on_pushButton_pressed()
{

   // ui->progressBar->setValue(i);


//ui->progressBar->update();

}

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