QString unicode

i read in Qt docs about QString and found that QString supports unicode encoding but still when i write some stances in text file i see some "?" between words.
the language that i use is part of unicode here this is my code.

Code:

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QFile dataF("fa.txt");
    dataF.open(QIODevice::WriteOnly | QIODevice::Append);
    QTextStream streamF(&dataF);
    streamF<<fa<<"\r\n";
    dataF.close();

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im i miss something?
best regards

Quote:

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Originally Posted by ramin.lich

im i miss something?

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You didn't tell Qt how to encode your data. See QTextStream::setCodec().