Hi all,

I am using a QFileSystemWatcher to keep an eye on a Picture on RAM disk.
When the picture is replace by another, which mean it is "modified".
and i would like to emit a signal and get the image to display on a QLabel.

It works when i use QTimer to replace the QFileSystemWatcher.

It seems QFileSystemWatcher is not emitting any signal.

my code ask following:

Qt Code: 
  1. Dialog::Dialog(QWidget *parent) :
  2.     QDialog(parent),
  3.     ui(new Ui::Dialog)
  4. {
  5.     ui->setupUi(this);
  6.    /* timer = new QTimer(this);
  7.     timer->start(100);*/
  8.  
  10.     watcher.addPath("/mnt/rd/frame.jpg");
  11.     hsvSaveConnect();
  12.     checkBox();
  13.     connect(ui->save,SIGNAL(clicked()),this,SLOT(saveValueToSD()));
  14.     connect(ui->load,SIGNAL(clicked()),this,SLOT(loadInitValue()));
  15.     connect(&watcher,SIGNAL(fileChanged(const QString &)),this,SLOT(loadImage()));
  16.     connect(&watcher,SIGNAL(directoryChanged(const QString &)),this,SLOT(loadImage()));
  17.     qDebug() << watcher.files() << watcher.directories();
  18. }
  19.  
  20.  
  21. void Dialog::loadImage()
  22.  
  23.  
  24. {
  25.  
  26.     qDebug() << "img loaded";
  27.  
  28.  
  29.     QPixmap original("/mnt/rd/frame.jpg");
  30.  
  31.  
  32.     if(original.isNull())
  33.  
  34.  
  35.     {
  36.  
  37.         qDebug()<<"Failed to load image.";
  38.  
  39.  
  40.     }
  41.  
  42.     ui->original->setPixmap(original);
  43.  
  44.  
  45. }
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