LKBEN11148: Howto read a text file and process each line with Qt

Symptom

You need to process a big text file and do womething with each line

Cause

none

Solution

To read a text file and parse it into a text string you can use the following code:

     QFile file("in.txt");
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
         return;

     QTextStream in(&file);
     while (!in.atEnd()) {
         QString line = in.readLine();
         process_line(line);
     }

If you need to split the String (QString) into parts with a delimiter you can use the following code snippet:

     QString str = "a,,b,c";
     QStringList list1 = str.split(",");

Disclaimer:

The information provided in this document is intended for your information only. Lubby makes no claims to the validity of this information. Use of this information is at own risk!

About the Author

Author: Wim Peeters - Keskon GmbH & Co. KG

Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.

Latest update: 04/05/2021 | Comment: