How can I use QTextStream to read the first line in a string (read from a file before)?
streamin = QTextStream(str)
line = streamin.readLine()
It seems that this code doesn't work.
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3add some context (more code), you will not meet oracle here which is able to say what did you do wrong. – Marek R Dec 05 '13 at 13:50
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Again, like Marek suggested, please correct your syntax and post real code. – Son-Huy Pham Dec 05 '13 at 18:44
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I'm basically going to post a snippet of code from the Qt Documentation Site.
Better yet... here's something from stackoverflow as well.
// Instead of feeding in stdin, you can feed in QFile - i.e. QIODevice
QFile file("myfile");
// ... open file etc etc
QTextStream stream(&file);
QString line;
line = stream.readLine();
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Son-Huy Pham
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The QTextStream class does not accept python strings directly. For PyQt5, you must convert the string to a QByteArray first:
>>> s = """\
... First Line
... Second Line
... Third Line
... """
>>> ba = QtCore.QByteArray(s.encode('utf-8'))
>>> ts = QtCore.QTextStream(ba)
>>> ts.setCodec('utf-8')
>>> ts.readLine()
'First Line'
ekhumoro
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accepted answer proofs that you should write that `str` is python string. Anyway this answer is a bit to complicated, [see this page](http://www.commandprompt.com/community/pyqt/x2068). So to fix you code this should be enough: `streamin = QTextStream(QString(str))` – Marek R Dec 09 '13 at 09:37
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1@MarekR. You missed that the OP is using PyQt5. There is no QString in PyQt5, so only a QIODevice or QByteArray can be passed to the QTextStream constructor. Of course, your suggestion would work with PyQt4. Personally, I would avoid all the complications and use python's [io](http://docs.python.org/3/library/io.html#) module for this kind of thing. – ekhumoro Dec 09 '13 at 18:04