On quarta-feira, 31 de julho de 2013 19:39:28, Scott Aron Bloom wrote: > QTextCodec * codec = QTextCodec::codecForName( "UTF-8" ); > QString a = codec->toUnicode( "a" ); > If ( a.isEmpty() ) > // don't Show > QChar aChar = tmp.at( 0 ); > If ( aChar.unicode() != 'a' ) > // don't show > > This look ok?
You want the fromUnicode operation. We know what the UTF-16 representation of
U+0061 LATIN SMALL LETTER A is (one 16-bit word containing the value 0x61). We
need to test how it's encoded in this codec.
QChar letterA(0x61);
if (codec->fromUnicode(&letterA, 1) != "a") // [1]
// can't use
for all ASCII-compatible codecs, the result will be "a". In fact, that is true
for all codecs that Qt 4 ships, except for UTF-16 and UTF-32.
In Qt 5, because we use ICU now, that's no longer true. It's also not true if
someone else installs their own codecs.
[1] comparing to "a" is a trick that works only if your execution charset is
also ASCII-compatible. In 20 years doing software development, I have yet to
see an environment that isn't. The ability to have different source,
translation and execution charsets is a legacy in C and C++ from the olden
days.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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