QFileSystemWatcher not updating on file change

[Aleksey_K]

@J-Hilk said in QFileSystemWatcher not updating on file change:

@Aleksey_K said in QFileSystemWatcher not updating on file change:

Are You able to repro

I'm,
I also tested QFile, instead of fstream and that also does not trigger QFileSystemWatcher

You created wrong example - need to monitor the file, not dir. I've modified it and it works:

#include <QApplication>

#include <fstream>
#include <ios>

#include <QDebug>
#include <QFile>
#include <QFileSystemWatcher>
#include <QPushButton>

void write_data(const std::string &content, const std::string &file_Name)
{
    std::ofstream output_file(file_Name, std::ios_base::out | std::ios_base::trunc);
    output_file << content;
    output_file.flush();
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QString fileName = QCoreApplication::applicationDirPath() + "/testFile.txt";
    QFile f(fileName);
    qDebug() << fileName;
    Q_ASSERT(f.open(QIODevice::WriteOnly));
    f.write("asdasdasdasdas");
    f.close();

    QFileSystemWatcher watcher({ fileName });
    QObject::connect(
            &watcher, &QFileSystemWatcher::fileChanged,
            [](const QString &path) -> void { qDebug() << "File changed" << path; });

    QPushButton btn("Modify File");
    QObject::connect(&btn, &QPushButton::clicked,
                     [fileName = QCoreApplication::applicationDirPath()
                              + "/testFile.txt"]() -> void {
                         write_data("blublbub", fileName.toStdString());
                     });
    btn.show();

    return a.exec();
}

Mine variant does not!

[Aleksey_K]

No event loop in my test - that is the problem.