The problem is probably not in the conversion from QString, but in the conversion to QString. The QProcess::readALlStandardOutput() function returns a byte array. You have to convert that to a QString using the proper encoding using one of the QString::from*() variants, or even explicitly stating an encoding. Probably you could go for QString::fromLocal8Bit(), but I’m not sure about that.

What kind of text does the process output?

@Franzk
Seems like russian text in win cp1251 (or, oh god, cp 866) encoding :D

@Ruzik try toLocal8bit() to local QString, after it try using QTextCodec class for correct encoding

I try use all QString::from*, but it is donr work

What kind of text does the process output?

I think, that it is must output russian text, as think Vass

Ruzik try toLocal8bit() to local QString, after it try using QTextCodec class for correct encoding

I try do it, but i get other strange simbols instead of normal signs:

1.  QString str;
2.  QByteArray bArray = process->readAllStandardOutput();
3.  str = QString(bArray).toLocal8Bit();
4.  QTextCodec * tc = QTextCodec::codecForLocale();
5.  if(tc->canEncode(str))
6.   textEdit->append(tc->toUnicode(bArray));

Get your incoming encoding right:

While you’re at it, check if codecForLocale() is actually the codec you need.

While you’re at it, check if codecForLocale() is actually the codec you need.

It seems that no,

“бв ­®ўЄ бўп§Ё б CORBINA…
Џа®ўҐаЄ Ё¬Ґ­Ё Ё Ї а®«п Ї®«м§®ў ⥫п…
ђҐЈЁбва жЁп Є®¬ЇмовҐа ў бҐвЁ…
“бв ­®ў«Ґ­ бўп§м б CORBINA.
Љ®¬ ­¤ гбЇҐи­® § ўҐа襭 .

That of course implied that you find out what encoding the external process uses to output it’s text. Does it look OK when you run the application in a console? Does the application documentation say anything about it?

Process – rasdial.exe in Windows(http://msdn.microsoft.com/en-us/library/aa377004(v=vs.85).aspx )
Output on the russian language(on the my computer), but i dont know encoding of this process

There is a slight possibility that that program outputs utf16 encoded data. Just using the byte array won’t bu sufficient then. I’m not sure how to find out whether it does, though.

I’m not sure how to find out whether it does, though

I try to ask it by Microsoft))

Microsoft didnt get me answer, i think that Vass was right, it is CP1251

I found that it is may CP1251 or koi8-U

Consider choosing that locale explicitly:

Yes, it makes a difference in converting the string to unicode/QString
Windows-1251:
“бв ­®ў«Ґ­ бўп§м б CORBINA.
Љ®¬ ­¤ гбЇҐи­® § ўҐа襭 .

Koi8-U
⌠АБ═ґ╝╒╚╔ґ═ А╒ОїЛ А CORBINA.
┼╝╛═ґє═ ЦА╞╔Хґ╝ ї═╒╔ЮХ╔ґ═.

I find it, it was CP866
Many thanks for your help!