File Problem

[oonursrc]

this is what i have done

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QTimer>
#include <QTextStream>
#include <QString>
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
QTimer *timer = new QTimer(this);
    timer->start(2000);
    connect(timer,SIGNAL(timeout()),this,SLOT(DegerGetir()));
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow:: DegerGetir()
{
QFile file ( "C:/Users/Onur/Desktop/Deneme2.txt" ) ;
    if ( !file.open ( QIODevice::ReadOnly | QIODevice::Text ))
        {
          qFatal("Dosya acilamadi!");return;
        }
     QTextStream in ( &file ) ;
     QString line = in.readLine () ;
       while ( !line.isNull ())
          {
           ui->textBrowser->append(line);
           line = in.readLine () ;
          }
 
      file.close();
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QTimer>
#include <QTextStream>
#include <QString>


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

QTimer *timer = new QTimer(this);
    timer->start(2000);
    connect(timer,SIGNAL(timeout()),this,SLOT(DegerGetir()));
}

MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow:: DegerGetir()
{
QFile file ( "C:/Users/Onur/Desktop/Deneme2.txt" ) ;
    if ( !file.open ( QIODevice::ReadOnly | QIODevice::Text ))
        {
          qFatal("Dosya acilamadi!");return;
        }
     QTextStream in ( &file ) ;
     QString line = in.readLine () ;
       while ( !line.isNull ())
          {
           ui->textBrowser->append(line);
           line = in.readLine () ;
          }

      file.close();

}

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the file is opened again and again and program prints elements of file to QTextBrowser. but i want to print line by line with QLabel.

Thank you for your interest

[Lykurg]

Ok, seems you know almost everything ;-) So try to do:
- Read the file once at startup and cache it's content in a QStringList.
- create a private variable storing the current index of the QStringList.
- start the timer like you did and call a slot which, takes one item out of the QStringList and set this text to a label. (according to the index, and don't forget to count it)

..or does the content of the file change over time?

Best.

[oonursrc]

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QTimer>
#include <QTextStream>
#include <QString>
#include <QVector>

QVector<QString> Veriler;
int i=0;
int count=0;

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

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

void MainWindow::Ekle()
{
//ui->textBrowser->append(line);
if(i<count)
{
//ui->textBrowser->append(Veriler.at(i));
ui->lbldeger->setText(Veriler.at(i));
i++;
}

}

void MainWindow:: DegerGetir()
{
QTimer *timerEkle = new QTimer(this);
QFile file ( "C:/Users/Onur/Desktop/Deneme2.txt" ) ;
if ( !file.open ( QIODevice::ReadOnly | QIODevice::Text ))
{
qFatal("Dosya acilamadi!");return;
}

QTextStream in ( &file ) ;
//QString line = in.readLine () ;
QString line;
do
{
//ui->textBrowser->append(line);
line = in.readLine () ;
Veriler.append(line);
count++;
}while ( !line.isNull ());

file.close();

timerEkle->start(2000);
connect(timerEkle,SIGNAL(timeout()),this,SLOT(Ekle ()));
}




Thank you for your help. It really helps to me. I did this and it works nice