CODEWITHSUNDEEP
c++qt
Arda Özceviz
Arda Özceviz

Reputation: 475

QString line.split

I am having trouble with split function on QT. I have a text file and the very first line is like this:

10,100;100,100;100,100;100,200;100,200;300,200;300,200;300,350;300,350;250,350;250,350;250,300;250,300;200,300;200,300;200,400;200,400;10,400;10,400;10,100

Here every two numbers represents a point with x an y values and semicolons divides the points. After every semicolon there is a new point.

What I want to do is split these numbers element by element like;

Element 0: 10
Element 1: 100
Element 2: 100
Element 3: 100
...

I have managed to do this but there wasn't any semicolons or colons in the text file.

First line of the text file:

10 100 100 100 100 200 300 200 300 350 250 350 250 300 200 300 200 400 10 400 10 100

This is how i did it:

void Dialog::readFile()
{
    QFile file("/Path/of/the/text/file/Data.txt");

    if(!file.open(QIODevice::ReadOnly)) {
        QMessageBox::information(0, "info", file.errorString());
    }

    QString line = file.readLine();
    qDebug() << "line:" << line << "\n";
    QStringList list = line.split(" ");
    double element;

    for(int i = 0; i < list.size(); i++) {
        element = list.at(i).toDouble();
        points_.append(element);
        qDebug() << "element:" << element << "\n";
    }
}

Output of this code is:

line: "10 100 100 100 100 200 300 200 300 350 250 350 250 300 200 300 200 400 10 400 10 100\r" 
element: 10 
element: 100 
element: 100 
element: 100 
element: 100 
element: 200 
element: 300 
element: 200 
....

I want to do this exactly the same way. Is there any suggestion?

PS: I am new on QT so please consider this.

Upvotes: 0

Views: 1125

Answers (1)

LogicStuff
LogicStuff

Reputation: 19627

You can use regular expression with the QString::split overload taking QRegExp or the next one taking QRegularExpression:

QStringList list = line.split(QRegExp(",|;")); // ",|;" matches ',' or ';'

QRegExp is called to be deprecated, but it can do the job here.

Upvotes: 1

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