can`t read a binary data!

[caduel]

errorString() is a method of QFile's base class QIOStream.


What do you mean a section of text and binary?
Using QDataStream you will read binary data.

Your code

QDataSteam in(&file);
QString inin;
in >> inin;

QDataSteam in(&file);
QString inin;
in >> inin;

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will not read some ascii from a (text) file, but rather the serialized binary representation of a QString which is something entirely different.
If you read ascii text with that code, interesting but unintended things will happen.