How to know the Name of a file, when a file is copied to a folder(QFileSystemWatcher)

[blue_sky]

Thank you ...
I implemented the same logic , but the problem is- In some cases, although entryList() gives file name, but the file takes time to exist physically . i.e- when I tried to load image(through QImage),while copy of file already in process, then most of time i got blank / partial images.
How can I solve this problem.(QFile().exist() failed whether file present completely or not).
I am thinking about SIGNAL SLOTS..
Need helpful suggestions.Thank you

@stampede: Well, if dir.entryList() returns the list of files in alphabetical order, that's one advantage over using the QSet if you want to display the files to the user. QSet stores entries in whatever order the internal hashing determines, so iterating over the contents of the QSet will not return an alphabetical list, even if they were inserted in alphabetical order. If you wanted to display the current contents in alphabetical order, you'd have to copy the QSet into a QStringList, then sort the list. This isn't so bad, since QString instances with the same values are shared.

So let's use the best of both our ideas - keep the current directory contents as a list, but use sets to determine what has changed:

void MyClass::directoryChanged( const QString & path )
{
    const QDir dir(path);
    QStringList newEntryList = dir.entryList();
    QSet<QString> newDirSet = QSet<QString>::fromList( newEntryList );
    QSet<QString> currentDirSet = QSet<QString>::fromList( _currentEntryList );
 
    //   Files that haven't changed
    QSet<QString> sameFiles = currentDirSet & newDirSet;
 
    // Files that have been added
    QSet<QString> newFiles = newDirSet - currentDirSet;
 
    // Files that have been removed
    QSet<QString> deletedFiles = currentDirSet - newDirSet;
 
    // and update the current set
    _currentEntryList = newEntryList;
}

void MyClass::directoryChanged( const QString & path )
{
    const QDir dir(path);
    QStringList newEntryList = dir.entryList();
    QSet<QString> newDirSet = QSet<QString>::fromList( newEntryList );
    QSet<QString> currentDirSet = QSet<QString>::fromList( _currentEntryList );

    //   Files that haven't changed
    QSet<QString> sameFiles = currentDirSet & newDirSet;

    // Files that have been added
    QSet<QString> newFiles = newDirSet - currentDirSet;

    // Files that have been removed
    QSet<QString> deletedFiles = currentDirSet - newDirSet;

    // and update the current set
    _currentEntryList = newEntryList;
}

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