[Qt-interest] Issues writing to QFile

[Paul England]

I've generally not had problems writing to streams before, but I've not 
done them in this way before.   I have a program which is getting data 
on a socket.  I want to write each line to a separate file (sort of).

The flow is generally something like:
get line -> store -> periodically parse any stored data -> process data 
-> write data to file

Below is a rough transcription, as I have the source on an email-less 
machine.

I'm not getting even the newlines in the QFile, in the write() routine.  
So it's basically not writing to the QTextStream, or the QTextStream is 
not writing it to the QFile. Before, I've always just opened the file, 
opened the stream, and viola, it's worked.  Is there an issue w/ keeping 
it open?  The "test" string I write when I first open the QFile is 
always properly written, btw.

class my_dialog : public QDialog
{
     Q_OBJECT
public:
     my_dialog();
     virtual ~my_dialog();

private:
     QFile        my_file;
     QTextStream    out_stream;
};

my_dialog::setup()
{
     QFile file( "myfile.txt" );
     if ( !file.open( QIODevice::WriteOnly ) ) {
         // boo
     } else {
         out_stream.setDevice( &my_file );
         out_stream << "test" << endl;   // so far so good
     }
}

my_dalog::parse()
{
     // do whatever
     QString  str  = socket_data_handler();
     write( str );
}

my_dalog::write( const QString& str )
{
     out_stream << str << endl;

     if ( file.error() ) {
         // error
     }   else if ( out_stream.device() == NULL ) {
         // error
     } else {
         printf( "Success\n" );
     }
}
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