Re: [icu-design] Apply ICU to properly manage command line arguments in C?

[Sune A. <sun...@ho...>]

Hi Vladimir,

thanks for helping out. This is how I do it (reading an environment variable 
and comparing it to a value) at the moment:

1) Create default converter
converter = ucnv_open( NULL, &error );

2) Convert char* setenv() to Unicode in UChar variable 'trace'
ucnv_toUChars( converter...., trace

3) Create a string to compare with
u_charsToUChars( "value", value, 6);

4) Compare the values
u_strCaseCompare( trace, 3, value, -1, U_FOLD_CASE_DEFAULT....

I'm new to ICU and Unicode so it's quite a challenge for me at the moment.
- Does the above make sense at all?
- Where can I look for good-practice implementation (on a tutorial kind of 
level, just to let you off the hook you know ;) A good way to learn I 
think...
- When should I NOT use U_FOLD_CASE_DEFAULT in the string comparison above?
- Are invariants part of all codepages? fopen is supposed to fail of 
characters outside the codepage is used, what happens if I add a suffix such 
as .xml to a file when the codepage used is, for example BIG5?? Can I fopen 
it again if the user types his filename including such a suffix?

Thanks again, sorry to keep bothering you
/Sune


>From: Vladimir Weinstein <wei...@gm...>
>Reply-To: icu...@li...
>To: icu...@li...
>Subject: Re: [icu-design] Apply ICU to properly manage command line 
>arguments in C?
>Date: Fri, 16 Dec 2005 08:08:43 -0800
>
>Hi Sune,
>
>the arguments would be in whatever 8-bit codepage the platform is
>using. Generally, if a file is specified on a command line, you should
>be able to open it using the argument. If, on the other hand, you need
>to read and process Unicode contents from command line, you can either
>convert from the platform codepage to Unicode or use invariant
>characters combined with \u notation, which would give you the regular
>Unicode range.
>
>Hope this helps.
>
>Regards,
>v.
>
>On 12/15/05, Sune Ahlgren <sun...@ho...> wrote:
> > Hi,
> >
> > on what format are command line arguments received in the main( int 
>argc,
> > char** argv) function?
> > For example I write a program that opens and prints the contents of a 
>file:
> >
> > program <filename>
> >
> > What approach should I use in ICU properly receive the filename and open 
>the
> > correct file? Are there any pit falls I need to know of?
> >
> > BRs
> > /Sune
> >
> > _________________________________________________________________
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>
>--
>Vladimir Weinstein, IBM GCoC-Unicode/ICU  San Jose, CA
>
>
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