QFile read only lines containing specific search term

RainyDays

Hello!

When i open a file to read all i want to select specific rows "to be saved" as an output to QStringList.
So when i read through a file and a line has ex. "orange" i want to save that line to a list.

My read file is a CSV and i have my search terms in a combo box.

Christian Ehrlicher

@RainyDays said in QFile read only lines containing specific search term:

So when i read through a file and a line has ex. "orange" i want to save that line to a list.

And what's the exact problem you face? Read the line, check for your condition and add the values to your stringlist.

RainyDays

Is it easier to do this while reading or when the data is in the list?

SGaist

Hi,

While reading, no need to load useless data.

RainyDays

Ok, so the output from the file needs to be limited by the condition.

RainyDays

Ok, so here is what i came up with :)

  if (database.open(QFile::ReadOnly | QIODevice::Text))
           {
               while(!fileOutputStream.atEnd())
               {
               lineData = fileOutputStream.readLine();
                if (lineData.contains(condition))
                {
                fileOutput.append(lineData.split("\n"));
                }

               }
               database.close();
           }

ChrisW67

I assume the thing named fileOutput is your desired QStringList.
What is the relationship between your input data, presumably database, and the text stream, fileOutputStream presumably a QTextStream, you are attempting to read from.

BTW, the string returned by QTextStream::readLine() does not contain any end-of-line markers, so there is not need to try to remove them.

RainyDays

Hello!

Yes you are correct.
the setup is like this

    QFile database("/RDS.csv");
    QTextStream fileOutputStream(&database);
    QString lineData;
    QStringList fileOutput;

And my search condition is

QString condition = ui->comboBox->currentText();

Also i don't need to hunt the end of line markers.
I had this setup when i was reading all data before.
I wanted to take the first column if the row contained a search term.
But for this it works fine with

fileOutput.append(lineData);