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Re: Displaying Unicode

Ahh... yes... I hadn't taken the concept of 'zero cost bridging' to its
ultimate conclusion. That's fixed now.

I still can't display the unicode strings properly and it appears to be a
conversion problem-- i.e. I'm not coming up with the correct string for
the actual display, but the display is working correctly.

The latest incarnation does something like the following (without working)
.

The test byte sequence is (copy/pasted from a file in a random
Japanese.lproj -- it will make very little sense, I suspect):

fe ff b9 30 c8 30 dc 30 fc 30 c9 30 6b 30 b9 30 c8 30 ea 30 f3 30 b0
30 4c 30 42 30 8a 30 7e 30 5b 30 93 30 00 00

It renders as this in iTunes:

c9ccc<c c+c9cc*c3c0c cc
c>cc

But renders as this in my app if I use kCFStringEncodingUnicode as shown
in the original code.

k$0l 0m00o00l$0f,0k$0l 0n(0o 0k0d00d0h(0g80e,0i 0

The code below fails completely because no conversion from
kTextEncodingISO10646_1993 to kTextEncodingUnicodeDefault -- direct or
indirect -- can be deduced by TECCreateConverter

b.bum

+ (TECObjectRef) _unicodeID3v2ToMacTextConverter
{
static TECObjectRef id3v2ToMacTextConverter = NULL;

if (id3v2ToMacTextConverter == NULL) {
OSStatus status;

status = TECCreateConverter(&id3v2ToMacTextConverter,
kTextEncodingISO10646_1993, kTextEncodingUnicode);
if (status != 0) {
NSLog(@"TECCreateConverter() error %d", status);
return nil;
}
}

return id3v2ToMacTextConverter;
}

+ (CFStringRef /* implies caller retain */) _convertUnicodeText:
(ConstTextPtr) textBuffer ofLength: (unsigned int) length
{
ByteCount actualInputConsumed;
ByteCount actualOutputProduced;
UInt8 outputBuffer[1024];
CFMutableStringRef returnString = CFStringCreateMutable(NULL, 0);
TECObjectRef textConverter = [self _unicodeID3v2ToMacTextConverter];

do {
OSStatus status;

status = TECConvertText(textConverter, textBuffer, length,
&actualInputConsumed, outputBuffer, sizeof(outputBuffer),
&actualOutputProduced);
if (status != 0) {
NSLog(@"TECConvertText() error %d", status);
return nil;
}

CFStringAppendCharacters(returnString, (const UniChar
*)outputBuffer, actualOutputProduced);

length = length - actualInputConsumed;
textBuffer = textBuffer + actualInputConsumed;
} while (length > 0);

return returnString;
}





On Thursday, November 29, 2001, at 03:54 AM, Ali Ozer wrote:

>> returnString = [NSString stringWithString: (NSString *)
>> uniString]; // works-- but not without the cast... why?
>
> You don't need this step, as CFStrings and NSStrings are toll-free
> bridged, meaning they are equivalent. (A cast is all you need.)
>
>> CFDataRef stringData = CFDataCreateWithBytesNoCopy(NULL, (const UInt8
>> *) parsePtr, stringLength, kCFAllocatorNull);
>> uniString = CFStringCreateFromExternalRepresentation(NULL, stringData,
>> kCFStringEncodingUnicode);
>> CFRelease(stringData);
>
> These other steps look fine, and assuming the original data was in UCS-2
> format, should work. You should open the original data in TextEdit (or
> copy/paste) and see how it shows up...
>
> Ali

References: 
 >Re: Displaying Unicode (From: Ali Ozer <email@hidden>)



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