QTextStream readLine() problem

[high_flyer]

What do you do with pos? Do you use it to seek in the file?
Can you show more code responsible for reading and navigating in file?

[walito]

yes, of course.
The "pos" var is only to see something and always crash in the same position.

QCoreApplication a(argc, argv);
 
QStringList args = QCoreApplication::arguments();
 
QRegExp rxArgPath("^--sql_path=(.*)");
 
for (int i = 1; i < args.size(); ++i)
{
	//qDebug() << args.at(i);
 
	if(rxArgPath.indexIn(args.at(i), 0) == 0)
	{
		if(!rxArgPath.cap(1).isEmpty())
		{
			QFile sql_file(rxArgPath.cap(1));
 
			if(sql_file.exists())
			{
				if(sql_file.open(QIODevice::ReadOnly | QIODevice::Text))
				{
					qDebug() << "reading file " << rxArgPath.cap(1);
 
					QTextStream in(&sql_file);
					QString line;
					int pos = 0;
 
					do {
						line = in.readLine();
						qDebug() << "pos: " << pos << " length: " << line.length();
 
						++pos;
					} while (!line.isNull());						
 
					sql_file.close();
				}
			}
			else
			{
				qWarning() << "Er: the file " << rxArgPath.cap(1) << "not exists";
			}
		}
		else
		{
			qWarning() << "Er: Add the path --sql_path";
		}
	}
}
 
return a.exec();

QCoreApplication a(argc, argv);

QStringList args = QCoreApplication::arguments();

QRegExp rxArgPath("^--sql_path=(.*)");

for (int i = 1; i < args.size(); ++i)
{
	//qDebug() << args.at(i);

	if(rxArgPath.indexIn(args.at(i), 0) == 0)
	{
		if(!rxArgPath.cap(1).isEmpty())
		{
			QFile sql_file(rxArgPath.cap(1));

			if(sql_file.exists())
			{
				if(sql_file.open(QIODevice::ReadOnly | QIODevice::Text))
				{
					qDebug() << "reading file " << rxArgPath.cap(1);
					
					QTextStream in(&sql_file);
					QString line;
					int pos = 0;

					do {
						line = in.readLine();
						qDebug() << "pos: " << pos << " length: " << line.length();

						++pos;
					} while (!line.isNull());						
					
					sql_file.close();
				}
			}
			else
			{
				qWarning() << "Er: the file " << rxArgPath.cap(1) << "not exists";
			}
		}
		else
		{
			qWarning() << "Er: Add the path --sql_path";
		}
	}
}

return a.exec();

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thanks in advance

[high_flyer]

Ahh... this all thing is in your main...
I think that working with QIODevice needs a running event loop (but I am not sure).
Put this in to a class, and run this code after the event loop is running, that will be a good idea even if its not the problem.
Maybe some one else can confirm if this is the problem though.

EDIT:
[re-edit] I take back what I said here.