QString::fromUtf8 problems converting micro sign

[smacchia]

I am trying to convert the unicode micro-sign to use in a QString. I have tried the following:

QByteArray b(1, 0xb5);
QString s = QString::fromUtf8(b.constData(), b.length());

QByteArray b(1, 0xb5);
QString s = QString::fromUtf8(b.constData(), b.length());

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But the string isn't the micro-sign but a question mark in a circle.
I also tried:

QChar c(181);
QString s(c);

QChar c(181);
QString s(c);

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With the same result.
When using this with PyQt:

b = QByteArray(1, "\xb5")
s = QString.fromUtf8(b.data(), b.length())

b = QByteArray(1, "\xb5")
s = QString.fromUtf8(b.data(), b.length())

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or

c = QChar(181);
s = QString(c);

c = QChar(181);
s = QString(c);

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both c and b when I print them are also the question mark in the circle. When I try to convert to a QString I get the following error from the python interpreter:

UnicodeEncodeError: 'ascii' codec can't encode character u'\xb5' in position 0:ordinal not in range(128)

UnicodeEncodeError: 'ascii' codec can't encode character u'\xb5' in position 0:ordinal not in range(128)

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I have tried a variety of combinations and googled everywhere for an adequate solution, to no avail.

FWIW, the python string conversion works as I'd expect, but I need a QString:

>> s  = unichr(181).encode("utf8")
>> print s
>> µ
>> print QString(s)
Traceback (most recent call last):
  File "<input>", line 2, in <module>
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

>> s  = unichr(181).encode("utf8")
>> print s
>> µ
>> print QString(s)
Traceback (most recent call last):
  File "<input>", line 2, in <module>
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

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Any help with this is greatly appreciated.

[wysota]

0xb5 is very unlikely to be a micro. The best thing you can do is to just put the real micro character in the file and save it with utf-8 encoding. Also make sure your font contains a micro character at this position.

[ChrisW67]

The Unicode code point for the "Micro sign" is \u00b5. In UTF-8 encoding this is a two byte sequence \xc2\xb5. You could also use Greek small letter mu \u03bc.

Any of these:

QString s(QChar(0x00b5));
QString s = QString::fromStdWString(L"\u00b5");
QString s = QString::fromUtf8("\xc2\xb5");

QString s(QChar(0x00b5));
QString s = QString::fromStdWString(L"\u00b5");
QString s = QString::fromUtf8("\xc2\xb5");

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This works for me but I am not sure if it is by-design or by-accident:

QString s = QString::fromUtf8("\u00b5");

QString s = QString::fromUtf8("\u00b5");

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Look up Unicode code points here: http://www.unicode.org/charts
Convert into a bucket of other forms here: http://people.w3.org/rishida/tools/conversion/

[smacchia]

Thanks! This is a big help.