LKBEN11148: Hoto read a text file and process each line with Qt
LKB | Created: 02/04/2020 | Version: 0 | Language: EN | Rating: 0 | Outdated: False | Marked for deletion: False
Author: Wim Peeters - Keskon GmbH & Co. KG
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(",");
About the Author
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 in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.