How to read a textfile and display result in gui [Qt programming problem]

[alwaysTry]

could anyone give a helping hand?
my code was able to read the textfile and display using gui.
the textfile "data.txt" is in this form

123-GCF 2 1 2
124-BOG 4 1 2 5 7
456-DES 6 6 7 8 9 3 1
234-REE 2 9 8

wherein :
123-GCF = code
2 = size of array
1 2 = array of numbers

i need to count the frequency of numbers in the third column that is the array of numbers
and display the result in the gui.

in this example once i clicked the display button it should show
1 = 3;
2 = 2;
3 = 1;
...
...
...

so far I have this code................... your help is very much appreciated..

thanks in advance ....

#include<QtCore>
#include<QLabel>
#include<QFile>
#include<QtGui>
#include<QString>
#include <iostream>
class DblVec : public QVector<int>{
public:
     DblVec(int n):QVector<int>(n){}
};
using namespace std;
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *window         = new QWidget;
    QGridLayout *layout     = new QGridLayout;
    QPushButton *readFile   = new QPushButton;
    QString                 date;
    quint32                 size;
    DblVec                  line(size);
    QTextBrowser *browse    = new QTextBrowser;
    QScrollBar *scrollbar   = new QScrollBar;
    QFile infile("data.txt");
 
    window->setWindowTitle("Data");
    readFile->setText("Display Relative Frequency");
    layout->addWidget(readFile, 0, 1);
 
    if ( infile.open(QIODevice::ReadOnly |QIODevice::Text) )
    {QString line2;
        QTextStream stream( &infile );
           while(!stream.atEnd())
        {
              line2 = stream.readAll();
        }
 
           browse->setText(line2);
            browse->setVerticalScrollBar(scrollbar);
            browse->show();
            infile.close();
     }
 
    layout->addWidget(browse, 0, 0);
    window->setLayout(layout);
    window->resize(500, 400);
    window->show();
    return a.exec();
}

#include<QtCore>
#include<QLabel>
#include<QFile>
#include<QtGui>
#include<QString>
#include <iostream>
class DblVec : public QVector<int>{
public:
     DblVec(int n):QVector<int>(n){}
};
using namespace std;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *window         = new QWidget;
    QGridLayout *layout     = new QGridLayout;
    QPushButton *readFile   = new QPushButton;
    QString                 date;
    quint32                 size;
    DblVec                  line(size);
    QTextBrowser *browse    = new QTextBrowser;
    QScrollBar *scrollbar   = new QScrollBar;
    QFile infile("data.txt");

    window->setWindowTitle("Data");
    readFile->setText("Display Relative Frequency");
    layout->addWidget(readFile, 0, 1);

    if ( infile.open(QIODevice::ReadOnly |QIODevice::Text) )
    {QString line2;
        QTextStream stream( &infile );
           while(!stream.atEnd())
        {
              line2 = stream.readAll();
        }
           
           browse->setText(line2);
            browse->setVerticalScrollBar(scrollbar);
            browse->show();
            infile.close();
     }

    layout->addWidget(browse, 0, 0);
    window->setLayout(layout);
    window->resize(500, 400);
    window->show();
    return a.exec();
}

To copy to clipboard, switch view to plain text mode 

[tbscope]

Counting numbers is pretty easy.

Instead of giving you the answer to your homework, try to think about the problem yourself.

What would you do to count the numbers?

Edit: lets make this simple.
I have: 1 1 2 3 5 2 8 1
How many times does 2 appear in this list? How do you count it?

[alwaysTry]

sorry, my englsih is very bad. i think i am not understood very well here.

my code shows that i am using QString for the entire line, that is how i read the textfile.

i am new to Qt so i am not even familiar with all the libraries and how to use it.

at first i tried to assign Qstring for the code, quint32 for the size, QVector for the array
but its still not working.

my problem is accessing the third column. obviously, i can't acces third column if i assign QString for the entire line when reading the textfile. I need to find ways of reading wherein I can access the third column. And from there, i can start doing my counting.

thanks for the comment... i will try to figure it out myself. it's hard to explain my english is very bad. a lesson is learn today. don't ever ask or you shall be bad mouthed.

[tbscope]

Ohh, from your first question I thought you had a problem with counting.

For the parsing, use a QTextstream but do not read the entire line into a string.
Try something like

QString string;
int integer1;
...
 
stream >> string >> integer1 >> ...;

QString string;
int integer1;
...

stream >> string >> integer1 >> ...;

To copy to clipboard, switch view to plain text mode 

[wysota]

You can also use QString::split() to get a list of field values but then you'll have to convert them to the types you need.