qDebug输出QString UTF-8非Ascii符号，如\\ uxxxx

Question

I am trying to convert string (QString) in unicode to utf-8.

qDebug prints string like this:

"Fault code soap:Client: \П\о\л\ь\з\о\в\а\т\е\л\ь \с \и\д\е\н\т\и\ф\и\к\а\т\о\р\о\м \«16163341545811\» \н\е \н\а\й\д\е\н"

I have tried using QTextCodec like this but it outputs same unreadable string:

QTextCodec *codec = QTextCodec::codecForName("UTF-8");
QString readableStr = QString::fromUtf8(codec->fromUnicode(str));

What am I doing wrong?

EDIT:

I wonder what is going on but it happens when qDebug prints QString ...

The following code

qDebug() << QString::fromUtf8("тест") << "тест" << QString::fromUtf8("тест").toUtf8().data();

prints out:

"\т\е\с\т" тест тест

Answer 1

I assume that the variable str has type QString. Your readableStr has the same contents as str. UTF-8 is an encoding of Unicode strings that uses 8 bit characters, that can be stored in a QByteArray. qDebug uses some special functions to display string in an console or debugging buffer to help you understand the contents of the string. If you put a QString in any GUI element you will see the expected readable content.

Answer 2

I don't know the exact thread on the Qt mailing list, but this behaviour was recently introduced, as qDebug is originally meant to debug an objects internal state. Non ASCII characters are now put out like this, which most people seem to dislike, but the developer or maintainer responsible wants to keep it this way.