Hi everyone. I have 2 different txt file. One is for writing and the other one is reading. Writing part is working but when I clicked the read button windows not responding. Can somebody help me in that issue? Here is my code: #include "mainwindow.h" #include "ui_mainwindow.h" #include <QFile> #include <QTextStream> #include <QMessageBox> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_2_clicked() //write { QFile file("C:/Users/ilknu/Documents/QFileDemo/abc.txt"); if(!file.open(QFile::WriteOnly | QFile::Text )) { QMessageBox::warning(this, "title", "file not open"); } QTextStream out (&file); QString text = ui->plainTextEdit->toPlainText(); out << text; file.flush(); file.close(); } void MainWindow::on_pushButton_clicked() //read { QFile file("C:/Users/ilknu/Documents/QFileDemo/abc.txt"); if(!file.open(QFile::ReadOnly | QFile::Text)) { QMessageBox::warning(this, "title", "file cannot open"); } QTextStream stream(&file); QString line = stream.readLine(); while (!line.isNull()) { continue; } line = stream.readLine(); ui -> plainTextEdit->setPlainText(line); file.close(); }

Hi The reason it stops responding is this if sentence QString line = stream.readLine(); while (!line.isNull()) { <<< since we just read a line above, it wont ever be be true and loop will loop forever continue; } you want logic to look like QFile inputFile(fileName); if (inputFile.open(QIODevice::ReadOnly)) { QTextStream in(&inputFile); while (!in.atEnd()) { QString line = in.readLine(); ... put line to plainTextEdit } inputFile.close(); }

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Windows not responding on reading file from txt

Solved General and Desktop

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D deleted286
4 Jan 2021, 06:36

@mrjj It works. Thank you for your help.
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Pablo J. Rogina

wrote on 4 Jan 2021, 11:31 last edited by

#21

@suslucoder said in Windows not responding on reading file from txt:

It works

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4 Jan 2021, 11:31