[Qt-interest] µ char in a QLabel

[Thiago Macieira]

Em Quarta-feira 16. Dezembro 2009, às 14.03.16, Maicon Kist escreveu:
> Hi,
> 
> how can i add the µ (micro sign, 0x00b5 in unicode chartset ) in a QLabel ?
> 
> I have tried this:
> 
> Qlabel *l = new QLabel("µ");
> 
> But, In the application the label show some weird characters.

The problem is the encoding of your source file and the default encoding of Qt 
mismatching.

The default encoding for QString construction directly from C strings is Latin 
1. If you saw "weird characters", my guess is your source file is encoded in 
UTF-8.

Your options therefore are:
1) change the encoding of your file
2) change Qt's encoding for C strings (see QTextCodec::setCodecForCStrings)
3) use QString::fromUtf8("µ")
4) use QChar(0x00B5)

Depending on which text editors you and your team use, it might be a good idea 
not to leave non-ASCII characters in your source code. Opening the file in the 
wrong encoding might cause it to become corrupt when saving.

So you can also write:
5) QString::fromUtf8("\302\265")
6) QString::fromLatin1("\xB5") or QLatin1String("\xB5") or even 
QLatin1Char('\xB5')

I still think it's a good idea to add to C++0x requirement that C++ source 
files should be decoded as UTF-8 when the new unicode character sequences are 
encountered. Otherwise, writing u"µ" will result in the same issue all over 
again.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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