Thanks everyone for helping.
This solved my problem on how to handle characters outside the 16 bits
range.
Anders Lassen
On Sep 25, 2009, at 8:57 PM, Aki Inoue wrote:
The Unicode values beyond 16bit range are represented with a pair of
UTF-16 characters in U+D800 ~ U+DFFF.
See relevant items in <http://unicode.org/glossary/#S> for the
definitions.
There are several ways to insert UTF-32 values into NSString.
Doug mentioned some.
The easiest is to use the C99 universal character name.
For example, U+1D400 can be represented with @"\U0001D400" using
compliers shipped with Xcode 3.0 or later.
Another approach is to use an array of UTF-32 characters and convert
with NSUTF32StringEncoding.
UTF32Char character = 0x0001D400;
#if __BIG_ENDIAN__
NSStringEncoding encoding = NSUTF32BigEndianStringEncoding;
#else
NSStringEncoding encoding = NSUTF32LittleEndianStringEncoding;
#endif
NSString *string = [[NString alloc] initWithBytes:&character
length:sizeof(character) encoding:encoding];
Or, you could fill a UTF-16 buffer and create from it using new
inline functions introduced with SnowLeopard.
UniChar characters[2];
NSString *string;
CFStringGetSurrogatePairForLongCharacter(0x0001D400, characters);
string = [[NSString alloc] initWithCharacters:characters length:2];
Aki
On 2009/09/25, at 11:33, Anders Lassen wrote:
I have tried this but gave up, because I did not now of surrogate
pairs.
But I will try again.
Anders Lassen
On Sep 25, 2009, at 8:27 PM, Douglas Davidson wrote:
On Sep 25, 2009, at 11:18 AM, Anders Lassen wrote:
But still, I can not see, how this solve my problem getting
characters outside the unicode 16 bits range into a NSString.
NSString is conceptually UTF-16, which means that characters
outside the BMP are represented using surrogate pairs. However,
for purposes of getting them into an NSString, you can (for
example) represent them in UTF-32 and use one of the conversion
methods. Alternatively, you could put them in a file, maybe a
text file or a plist, and let the standard import methods deal
with encoding issues.
Douglas Davidson
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