[Qt-interest] Issues writing to QFile

[sarvesh saran]

Hi,

You may want to look at my_dialog::setup() again....file will go out of
scope at the end of setup().

But then again, this could be a typo as this is a rough transcription.....

Also, in QString

 str  = socket_data_handler(); check the value of str and see that it is not
empty (unlikely)...

thanks,
Sarvesh

On Fri, Mar 18, 2011 at 7:12 AM, Paul England <pengland at cmt-asia.com> wrote:

>  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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