[Interest] QTextStream doesn't write to QFile

[Igor Mironchik]

Hi. I'm doing a simple log class. I'm sure that Log creates after  
QCoreApplication.
QCoreApplication is static. I create QCoreApplication as:

static QSharedPointer< QCoreApplication > application(
	int argc = 0, char ** argv = 0 )
{
	static QSharedPointer< QCoreApplication > app(
		new QCoreApplication( argc, argv ) );

	return app;
}

But this Log doesn't write anything to the file. File creates, I'm sure in  
it. But nothing writes. What is the reason?

And another problem is that QFile in destructor crashes application. Why?

-------------------------------------------
//! Severity
enum Severity {
	//! Info.
	Info = 0,
	//! Warning.
	Warning = 1,
	//! Error.
	Error = 2,
	//! Critical.
	Critical = 3
}; // enum Severity

//
// Log
//

class LogPrivate;

//! Log.
class Log {
public:
	static Log & instance();

	Log & operator [] ( Severity s );

	Log & operator << ( const QString & data );
	Log & operator << ( const char * data );

private:
	Log();
	~Log();

private:
	Q_DISABLE_COPY( Log )

	QScopedPointer< LogPrivate > d;
}; // class Log

#define LOG( S ) Log::instance()[ S ]
-------------------------------------------

And here is implementation:

-------------------------------------------
//
// LogPrivate
//

class LogPrivate {
public:
	LogPrivate()
		:	severity( Info )
	{
		stream.setCodec( QTextCodec::codecForName( "UTF-8" ) );
	}

	~LogPrivate()
	{
		stream.flush();

		if( file.isOpen() ) // HERE APPLICATION CRASHES !!!
			file.close();	}

	void initLogFile( const QDate & d )
	{
		if( date != d )
		{
			stream.flush();

			if( file.isOpen() )
				file.close();

			file.setFileName( QLatin1String( "./log/test." ) +
				d.toString( QLatin1String( "yy.MM.dd" ) ) +
				QLatin1String( ".log" ) );
			file.open( QIODevice::WriteOnly | QIODevice::Append );

			stream.setDevice( &file );

			date = d;
		}
	}

	QString severityToString() const
	{
		switch( severity )
		{
			case Info :
				return QLatin1String( "info" );

			case Warning :
				return QLatin1String( "warning" );

			case Error :
				return QLatin1String( "error" );

			case Critical :
				return QLatin1String( "critical" );

			default :
				return QString();
		}
	}

	//! Severity.
	Severity severity;
	//! Stream.
	QTextStream stream;
	//! File.
	QFile file;
	//! Date.
	QDate date;
}; // class LogPrivate


//
// Log
//

Log &
Log::instance()
{
	static Log log;

	return log;
}

Log &
Log::operator [] ( Severity s )
{
	d->severity = s;

	d->initLogFile( QDate::currentDate() );

	d->stream << "\n" << "[" << QTime::currentTime().toString( QLatin1String(  
"hh:mm:ss" ) )
		<< "] [" << d->severityToString() << "] ";

	d->severity = Info;

	return *this;
}

Log &
Log::operator << ( const QString & data )
{
	d->stream << data;

	return *this;
}

Log &
Log::operator << ( const char * data )
{
	Log::operator << ( QString( data ) );

	return *this;
}

Log::Log()
	:	d( new LogPrivate )
{
}

Log::~Log()
{
}
-------------------------------------------


-- 
Best Regards,
Igor Mironchik.