QFileSystemWatcher problem

YDYD

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:

@Dialog::Dialog(QWidget parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
/ timer = new QTimer(this);
timer->start(100);*/

QFileSystemWatcher watcher;
watcher.addPath("/mnt/rd/frame.jpg");
hsvSaveConnect();
checkBox();
connect(ui->save,SIGNAL(clicked()),this,SLOT(saveValueToSD()));
connect(ui->load,SIGNAL(clicked()),this,SLOT(loadInitValue()));
connect(&watcher,SIGNAL(fileChanged(const QString &)),this,SLOT(loadImage()));
connect(&watcher,SIGNAL(directoryChanged(const QString &)),this,SLOT(loadImage()));
qDebug() << watcher.files() << watcher.directories();

}

void Dialog::loadImage()

{

qDebug() << "img loaded";


QPixmap original("/mnt/rd/frame.jpg");


if(original.isNull())


{

    qDebug()<<"Failed to load image.";


}

ui->original->setPixmap(original);

}@

dheerendra

It may be because you are using the QFileSystemWatcher as local variable inside the constructor. Try changing the same to

QFileSystemWatcher *watch = new QFileSystemWatcher

It should work.