Re: Unicode canonical decomposed form and text encoding
Re: Unicode canonical decomposed form and text encoding
- Subject: Re: Unicode canonical decomposed form and text encoding
- From: Renaud Boisjoly <email@hidden>
- Date: Tue, 14 Jan 2003 19:11:58 -0500
Hi again
So I used getCharacters but somehitng isn't working still. I think I
may have asked part of my question backwards. Boy, Unicode is not too
simple! Perhaps with an example.
Say the string I need to convert is "A acute". It first looks like:
\\300
But what I need is:
A\\u0300
I'm not sure yet how each is supposed to be called.
I get the feeling that the routine you so kindly put together actually
does the opposite... is this possible? If so, I tried inverting some of
the parameters in CreateTextConverter, but it fails to convert
anything... any clues?
Thanks again to all for helping out!
Renaud
On Tuesday, January 14, 2003, at 05:44 PM, Aki Inoue wrote:
Renaud,
You can use getCharacters: to bulk-get characters from NSString.
One thing to note if you're using stack buffer in a loop as in your
original example.
Depending on your needs in decomposed format, you have to be a little
bit more careful at the end of each buffer run.
For example, let's assume your source NSString contains the following
character sequence "U0104 U0300" LATIN CAPITAL LETTER A WITH OGONEK
and COMBINING GRAVE ACCENT. "!" (This should display correctly in
Mail.app).
When decompose, they can be either "U0041 U0328 U0300" or "U0041 U0300
U0328". They are both perfectly legal Unicode character sequences,
but only the latter is canonically decomposed format.
Back to the NSString with these character sequences, you won't get the
canonical format if your working buffer ends between U0104 and U0300
since TEC cannot know the next character in that case.
So, if you want to have canonically decomposed format (not just
decomposed), you need to make sure your working buffer ends BEFORE a
base character (![[NSCharacter nonBaseCharacterSet]
characterIsMember:theChar]). You don't have to worry about surrogates
since pre-Jaguar TEC doesn't recognize them.
Aki
On 2003.1.14, at 01:08 PM, Renaud Boisjoly wrote:
Hi again
Ok, I think it will work, but I do have a last newbie question to ask
if I can...
I've managed to convert from the UniChar result to an NSString, but
I'm not clear on how to efficiently do the reverse. My original
string is in an NSString and I guess I need to convert it to
UniChar... but being pretty unexperienced, this looks like a mystery
to me. Do I need to iterate through each character using
characterAtIndex and add them to characters[] one by one? Should I
use an NSScanner? Is there an immensely obvious way to do this and
I'm just not seeing it (probably). I now its probably something I
should know, but considering I've only been programming for a year or
so except for stuff like AppleScript, I miss a lot of things.
My current idea is a for loop using characterAtIndex to add each
character...
Thanks for your time if you can afford it.
Renaud
On Tuesday, January 14, 2003, at 02:39 PM, Aki Inoue wrote:
#import <Foundation/Foundation.h>
static UniChar characters[] = {0x00C0}; // LATIN CAPITAL LETTER A
WITH GRAVE
#define MAX_BUFFER_LENGTH (100)
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
UnicodeToTextInfo textInfo;
UnicodeMapping mapping =
{CreateTextEncoding(kTextEncodingUnicodeDefault,
kTextEncodingDefaultVariant, kUnicode16BitFormat),
CreateTextEncoding(kTextEncodingUnicodeDefault,
kUnicodeCanonicalDecompVariant, kUnicode16BitFormat),
kUnicodeUseLatestMapping};
UniChar buffer[MAX_BUFFER_LENGTH];
ByteCount inputRead, outputLen;
OSStatus status;
status = CreateUnicodeToTextInfo(&mapping, &textInfo);
if (noErr != status) {
NSLog(@"Failed to create UnicodeToTextInfo");
exit(1);
}
status = ConvertFromUnicodeToText(textInfo, sizeof(characters),
characters, kTECKeepInfoFixMask, 0, NULL, NULL, NULL,
MAX_BUFFER_LENGTH * sizeof(UniChar), &inputRead, &outputLen, >>> buffer);
if (noErr != status) {
NSLog(@"Failed to convert string");
exit(1);
}
DisposeUnicodeToTextInfo(&textInfo);
[pool release];
return 0;
}
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