Getting a specific text from a text file and inserting to a QStringList!

Lasith

IN my qt c++ application I have created a functionality to upload and read text files! I want to get a specific part of selected text lines to a QStringLIst!
Following is my code

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    QString filepath;
    void readValues();
    QStringList values;
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::MainWindow *ui;
};

MainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QFileDialog"
#include "QTextStream"

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

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

void MainWindow::on_pushButton_clicked()
{
    filepath=QFileDialog::getOpenFileName(this, "Get Any File");
        ui->lineEdit->setText(filepath);
}

void MainWindow::readValues(){
    QFile file(filepath);
       if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
           return;

    QTextStream in(&file);
          while (!in.atEnd()) {

              QString line = in.readLine();
           
              values<<line;
              }
       }
          ui->label->setText(QString::number(values.size()));
}

void MainWindow::on_pushButton_2_clicked()
{
    readValues();
}

The text file(names.txt) I read have the following format!

<h>Hello<h>
<name>John</name>
<h>Hello<h>
<name>Smith</name>
<h>Hello<h>
<name>Mary</name>
<h>Hello<h>
<name>Anne</name>
<h>Hello<h>
<name>Jennifer</name>
<h>Hello<h>

Currenly I get all the text lines into the QStringList!
I want to get the words(without <name></name> tags) John,Smith,Marry,Anne,Jennifer into the QStringList named values! How can I do it?

VRonin

void MainWindow::readValues(){
QFile file(filepath);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
return;
const QRegularExpression nameExp(R"***(<name>(.+)<\/name>)***");
QTextStream in(&file);
QString line;
while (stream.readLineInto(&line)) {
const auto nameMatch = nameExp.match(line);
if(nameMatch.hasMatch())
values << nameMatch.captured(1);
}
 ui->label->setText(QString::number(values.size()));
}

Lasith

@VRonin Thanx I get an errors stating
"R was not declared in this scope"
"stream was not declared in this scope"
"nameMatch does not name a type"
"nameMatch was not declared in this scope"

VRonin

"R was not declared in this scope"

Old compiler? that's C++11. use const QRegularExpression nameExp("<name>(.+)<\\/name>"); then

"stream was not declared in this scope"

change while (stream.readLineInto(&line)) into while (in.readLineInto(&line))

"nameMatch does not name a type"

again old compiler const QRegularExpressionMatch nameMatch = nameExp.match(line);

"nameMatch was not declared in this scope"

The above solves this too

Lasith

@VRonin Thanx if there are several blank spaces before "<name>" how do I need to change the code?

VRonin

add \\s* wherever there could be empty space

Lasith

@VRonin unfortunately there is another error stating "class QTextStream has no memebr named readLineInto"

VRonin

What version of Qt are you using?

Replace it with your

 while (!in.atEnd()) {
line = in.readLine();

Lasith

@VRonin Thanx alot! I use Qt 5.2

JKSH

@Lasith said in Getting a specific text from a text file and inserting to a QStringList!:

I use Qt 5.2

That's not supported anymore.

Is it feasible for you to upgrade to a newer version? (Qt 5.10.0 was released last week)