CODEWITHSUNDEEP
c++qtgetline
user121273
user121273

Reputation: 59

Qt- using getline function

I am using Qt 5.2.1 and here is part of a function that I want to use in my program -

while( getline(in,str,':')
{
getline(str,'\n');
int var = atoi(str.c_str());
}

my question is how can I implement this in qt?

I searched the docs a bit and found out about readline and split but I dont know how to use them

any help is much appreciated. :D

Edit - my first getline checks for ':' in the text file and the second one picks up the number (that comes after ':') and converts it into a integer and stores it in a variable.

2 edit :

Here's how my text file looks like...

500 - 1000 : 1

1000 - 1500 : 2

1500 - 2000 : 7

2000 - 2500 : 6

the 1, 2, 7, 6 are the values that I need in my program

Upvotes: 0

Views: 7683

Answers (1)

Tyler Jandreau
Tyler Jandreau

Reputation: 4335

I'm not totally sure what you're trying to do. If you're trying to read a file:

QFile file("/path/to/file.whatever");
if (!file.open(QIODevice::ReadOnly | QIODevice::Text) {
   // error message here
   return;
end

while (!file.atEnd()) {
    QString line = in.readLine();
    // now, line will be a string of the whole line, if you're trying to read a CSV or something, you can split the string
    QStringList list = line.split(",");
    // process the line here
}

QFile closes itself when it goes out of scope.

If you're trying to split a string based on the : delimiter you have there, use:

QStringList list = line.split(":");

EDIT:

Now that you defined what you want to do (read a like like this "value:integer"), you can easily do that with QStringList. Example:

QString input = "value:1";
QStringList tokens = input.split(":");
int second = tokens.at(1).toInt();

Of course, you'll need to use your own error checking, but this is an example of what I think you're trying to do.

Upvotes: 3

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