[Qt-interest] Converting first character of a char* from local charset

[Thiago Macieira]

On Friday, 27 de May de 2011 20:02:28 Nikos Chantziaras wrote:
> It's for a charset-aware getch() implementation (same semantics as the
> one from curses.)  This version however, needs to read the first
> character (which can be multi-byte) from the input buffer, not just the
> first byte.
> 
> > Try converting the first 32 bytes to QString and then get the first one
> > out of the string.
> 
> This won't work, because then I'd have no idea how many bytes the
> character used.  getch() needs to remove the bytes that were read from
> the buffer, so that the next call won't read them again.
> 
> Anyway, I guess my question was answered.  There's no routine in Qt that
> does this directly, so I guess I'll have to live with it.  Fortunately,
> the code is in a place that isn't performance-critical.  Although a
> getch() is needed, it's used rarely; a getstr()-like routine is used far
> more often, where I simply convert the whole buffer.

Then read the full line and keep it in memory. Return one Unicode character at 
a time, until the line buffer is empty. Then you read more.

Unix terminals are line-buffered by default anyway, so you receive data in 
line-sized chunks.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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