QFileSystemWatcher

6-2-QFileSystemWatcher/6-2-QFileSystemWatcher.pro

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+QT -= gui
+
+CONFIG += c++11 console
+CONFIG -= app_bundle
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+        main.cpp \
+    watcher.cpp
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+HEADERS += \
+    watcher.h

6-2-QFileSystemWatcher/main.cpp

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+#include <QCoreApplication>
+#include "watcher.h"
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication a(argc, argv);
+
+    Watcher w;
+
+    return a.exec();
+}

6-2-QFileSystemWatcher/watcher.cpp

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+#include "watcher.h"
+
+Watcher::Watcher(QObject *parent) : QObject(parent)
+{
+    fsw.addPath(QDir::currentPath());
+    fsw.addPath(QDir::currentPath() + QDir::separator() + "test.txt");
+
+    connect(&fsw,&QFileSystemWatcher::fileChanged, this, &Watcher::fileChanged);
+    connect(&fsw,&QFileSystemWatcher::directoryChanged, this, &Watcher::directoryChanged);
+}
+
+void Watcher::fileChanged(const QString &path)
+{
+    qInfo() << "File changed: " << path;
+    if(fsw.files().length()) {
+        qInfo() << "Files that have changed:";
+        foreach(QString file, fsw.files()) {
+            qInfo() << file;
+        }
+    }
+}
+
+void Watcher::directoryChanged(const QString &path)
+{
+    qInfo() << "Directory changed: " << path;
+    if(fsw.directories().length()) {
+        qInfo() << "Dir changed:";
+        foreach(QString dir, fsw.directories()) {
+            qInfo() << dir;
+        }
+    }
+}

6-2-QFileSystemWatcher/watcher.h

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+#ifndef WATCHER_H
+#define WATCHER_H
+
+#include <QObject>
+#include <QDebug>
+#include <QDir>
+#include <QFileSystemWatcher>
+
+class Watcher : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Watcher(QObject *parent = nullptr);
+
+signals:
+
+public slots:
+    void fileChanged(const QString &path);
+    void directoryChanged(const QString &path);
+
+private:
+    QFileSystemWatcher fsw;
+};
+
+#endif // WATCHER_H