Re: Displaying Unicode
Re: Displaying Unicode
- Subject: Re: Displaying Unicode
- From: Bill Bumgarner <email@hidden>
- Date: Thu, 29 Nov 2001 12:06:58 -0500
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:
c9cc c<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