I'm getting last modified file in a directory using a QFileSystemWatcher with QDir & QFileInfoList. I create a slot for directoryChanged(QString) signal in my class inherited from QFileSystemWatcher. So when ever a file is created/modified, the slot stateChanged(QString str) is getting emitted 4 times. I'm unable to understand the reason why the slot is being called 4 times.
Here's my implementation -
Qt Code: 
  1. // cfilesystemwatcher.cpp
  2. #include "cfilesystemwatcher.h"
  3. #include <QDebug>
  4. #include <QDir>
  5. #include <QFileInfoList>
  6. #include <QDateTime>
  7.  
  8. CFileSystemWatcher::CFileSystemWatcher(QObject *parent) :
  10. {
  11.     // connections
  12.     connect(this, SIGNAL(directoryChanged(QString)), this, SLOT(stateChanged(QString)));
  13.     connect(this, SIGNAL(fileChanged(QString)), this, SLOT(stateChanged(QString)));
  14. }
  15.  
  16. void CFileSystemWatcher::stateChanged(QString str)    // <<---  slot
  17. {
  18.     QDir dir;
  19.     dir.setPath(str);
  20.     QFileInfoList list = dir.entryInfoList(QDir::NoDotAndDotDot | QDir::Files, QDir::Time);
  21.  
  22.     // Here I'm getting the last modified file.
  23.     qDebug() << list.first().baseName();   // <<--- This debug is printing the name 4 times to the console for 1 modification
  24. }
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Qt Code: 
  1. // main.cpp
  2. #include <QCoreApplication>
  3. #include "cfilesystemwatcher.h"
  4.  
  5. int main(int argc, char *argv[])
  6. {
  7.     QCoreApplication a(argc, argv);
  8.  
  9.     CFileSystemWatcher fileWatcher;
  10.     fileWatcher.addPath("/home/Rahul/Desktop/");
  11.  
  12.     return a.exec();
  13. }
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Now why is the slot with my qDebug() statement getting called 4 times ?
Also this is not giving the files modified inside the subs directories of the specified path. How do I make it emit signal for changes specified to a directory recursively ?

Thank you.