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Re: printing Utf8
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Re: printing Utf8


  • Subject: Re: printing Utf8
  • From: "Gerriet M. Denkmann" <email@hidden>
  • Date: Wed, 31 Oct 2012 22:57:52 +0700

On 31 Oct 2012, at 22:15, Ken Thomases <email@hidden> wrote:

> On Oct 31, 2012, at 9:41 AM, Gerriet M. Denkmann wrote:
>
>> I print strings like:
>> 	NSString *s = @"ร่วมรส";
>> 	fprintf(stderr, "%s\n", [ s UTF8String]);
>> and usually it just works.
>>
>> But sometimes it does not and I get garbage like:
>> ร่ว\340\270\241รส
>>
>> Converting these numbers to hex one gets: 0xe0 0xb8 0xa1 which is the Utf8-code for THAI CHARACTER MO MA.
>> So why does it not print (as it should):
>> ร่วมรส ?
>>
>> This is not really reproducible, but happens in about 3% of all lines.
>>
>> Known error, or my mistake?
>
> I have a couple of guesses:
>
> * A bug in Terminal.app.  Does it happen in other terminal apps like iTerm (if you've tried)?
No, have not. Not even used Terminal.
The stuff appears in one of the many panes of Xcode.

>  I assume it is never the case that the octal escape sequences get written out to file, if you redirect stderr.  Is that correct?  (That is, I don't think your program is actually writing out the octal sequence.  I think it's just a display issue.)
I don't do anything at all with stderr. Maybe Xcode does.

Another thing: same problem happens (occasionally) with NSLog() also in this Xcode output-pane.

Printing about 5000 chars (= 15000 Utf-8 bytes) there are 8 such glitches.
If somebody cuts my output into 1024 byte chunks, there will be 15 of these. If there is a 2 in 3 chance of getting the border just wrong (cutting a 3-byte Utf-char into 2 invalid parts) there will be 10 glitches.
Fits with the actual number of 8.

Guess your explanation sounds rather probable.

Kind regards,

Gerriet.



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References: 
 >printing Utf8 (From: "Gerriet M. Denkmann" <email@hidden>)
 >Re: printing Utf8 (From: Ken Thomases <email@hidden>)

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