[vtkusers] [Insight-developers] wx/vtk weirdness

Francois Bertel francois.bertel at kitware.com
Mon Nov 30 16:02:43 EST 2009


VTK/Common/vtkTimePointUtility.cxx

I added a imbue(vtkstd::locale::classic()); on the relevant C++ stream.

ref: http://public.kitware.com/cgi-bin/viewcvs.cgi/Common/vtkTimePointUtility.cxx?r1=1.2&r2=1.3

On Mon, Nov 30, 2009 at 3:53 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> Can you share what you changed? Which class?
>
> Bill
>
> On Mon, Nov 30, 2009 at 3:42 PM, Francois Bertel
> <francois.bertel at kitware.com> wrote:
>> Not only locale for language like French are different for thousand
>> separator but also English is different from C|POSIX !!
>>
>>  An integer of value 2000 will generate the string "2000" in POSIX|C
>> locale but will generate the string "2,000" in "en_US.UTF-8" locale.
>>
>> Example of test that was failing with "en_US.UTF-8":
>>
>> http://www.cdash.org/CDash/testDetails.php?test=37688960&build=483148
>>
>> This test is now fixed by forcing C|POSIX in the C++ stream.
>>
>>
>> On Mon, Nov 30, 2009 at 1:04 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>>> Tom,
>>>
>>> I don't think we need to be concerned with the per-thread issue. My
>>> changes are all local to the methods that need c-locale's. For
>>> example, surrounding the ReadImageInformation calls with save/restore
>>> locales in many readers fixes the readers.
>>>
>>> Maybe you can try my simple itkLocale class. I'll send it in a separate mail.
>>>
>>> Bill
>>>
>>> On Mon, Nov 30, 2009 at 12:57 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>>>> Tom,
>>>>
>>>> What I have done is create an itk class, itkLocale, that in its
>>>> constructor saves the current c-locale and creates a new one. The
>>>> destructor restores the original locale.
>>>>
>>>> C++-locales are handled explicitly with imbue.
>>>>
>>>> I'll try your approach in the itkLocale class.
>>>>
>>>> BTW, I have not checked in any code yet.
>>>>
>>>> I think it is time to start an ITK Policy and Procedure page for
>>>> internationalization on the itk wiki.
>>>>
>>>> It can include the work you are doing with unicode.
>>>>
>>>> I'll give it a stab today. Then we can start a new thread on itk developers.
>>>>
>>>> Bill
>>>>
>>>>
>>>> On Mon, Nov 30, 2009 at 12:50 PM, Tom Vercauteren
>>>> <tom.vercauteren at gmail.com> wrote:
>>>>> Hi Bill,
>>>>>
>>>>> I would just like to mention that in our group we have been facing
>>>>> several issues with locale support on mac.
>>>>>
>>>>> Looking at the documentation of xlocale:
>>>>>  http://developer.apple.com/Mac/library/documentation/Darwin/Reference/ManPages/man3/xlocale.3.html
>>>>> you will see that setlocale will have absolutely no effect (on mac,
>>>>> maybe on windows also
>>>>> http://msdn.microsoft.com/en-us/library/26c0tb7x.aspx ) if a
>>>>> per-thread locale had been specified.
>>>>>
>>>>> Using newlocale, duplocale, uselocale and freelocale seems a better option:
>>>>>  http://www.opengroup.org/onlinepubs/9699919799/functions/uselocale.html
>>>>>  http://www.opengroup.org/onlinepubs/9699919799/functions/newlocale.html
>>>>>  http://www.opengroup.org/onlinepubs/9699919799/functions/duplocale.html
>>>>>  http://www.opengroup.org/onlinepubs/9699919799/functions/freelocale.html
>>>>>
>>>>>
>>>>> For example, to put only the LC_NUMERIC parameter to C, here is how we
>>>>> chose to proceed:
>>>>>
>>>>> // Create a new locale based on a copy of the current one (which need
>>>>> not be explicitly set)
>>>>> // but where LC_NUMERIC has been modified to match the C locale
>>>>> locale_t tempLocale = newlocale(LC_NUMERIC_MASK, NULL, NULL);
>>>>> // Use this new locale and store the current one to reset it aftwards
>>>>> locale_t previousLocale = uselocale(templocale);
>>>>>
>>>>> [Actual useful code]
>>>>>
>>>>> // Reset the locale to the previous one
>>>>> uselocale(previousLocale)
>>>>> // More house keeing
>>>>> freelocale(tempLocale)
>>>>>
>>>>>
>>>>> Actually, on mac we also had to do explicitly create thread-specific
>>>>> locale to avoid some random crash in heavily threaded code. But that
>>>>> is a slightly different topic
>>>>>
>>>>> Cheers,
>>>>> Tom
>>>>>
>>>>>
>>>>> On Mon, Nov 30, 2009 at 17:08, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>>>>>> I've already made a pass through the itk readers. Several were broken
>>>>>> wrt locale.
>>>>>>
>>>>>> I used a combination of C++ and C locale api's. I encapsulated the C
>>>>>> locale in and itk::Locale class.
>>>>>>
>>>>>> I have not checked in any changes yet, but I went from over 40 failing
>>>>>> I/O tests down to 0.
>>>>>>
>>>>>> Bill
>>>>>>
>>>>>> On Mon, Nov 30, 2009 at 10:58 AM, Marcus D. Hanwell
>>>>>> <marcus.hanwell at kitware.com> wrote:
>>>>>>> On Saturday 28 November 2009 13:19:58 Bill Lorensen wrote:
>>>>>>>> Luis,
>>>>>>>>
>>>>>>>> Actually, we can surround certain functions with c-style setlocale and
>>>>>>>> it solves the problems. I already fixed StimulateImageIO,
>>>>>>>> PolygonGroupSpatialObjectXMLFile and VTKImageIO. I have not checked in
>>>>>>>> any changes yet. Still more investigation is needed as to the best
>>>>>>>> portable solution.
>>>>>>>>
>>>>>>>> I do this:
>>>>>>>>   const char *originalLocale;
>>>>>>>>   char *currentLocale;
>>>>>>>>   originalLocale = setlocale(LC_NUMERIC, NULL);
>>>>>>>>   currentLocale = strdup(originalLocale ? originalLocale : "C");
>>>>>>>>   setlocale(LC_NUMERIC, "C");
>>>>>>>>
>>>>>>>> ......
>>>>>>>>
>>>>>>>>
>>>>>>>> setlocale(LC_NUMERIC, currentLocale);
>>>>>>>>         free(currentLocale);
>>>>>>>
>>>>>>> A page from the Apache C++ resource site gives some good explanations of why
>>>>>>> the C++ locale should be preferred. Mainly because the C locale is a global
>>>>>>> resource, whereas in the C++ locale instances of the locale can be created.
>>>>>>>
>>>>>>> http://stdcxx.apache.org/doc/stdlibug/24-3.html
>>>>>>>>
>>>>>>>> For example in StimulateImageIO I surrounded the calls in
>>>>>>>> StimulateImageIO::InternalReadImageInformation with the above
>>>>>>>> snippets.
>>>>>>>>
>>>>>>>> There are other readers/writers that use C++ streams, and there we
>>>>>>>> will have to imbue.
>>>>>>>
>>>>>>> I think that using the C locale is probably the easiest short term solution,
>>>>>>> but to support GUIs using different locales we should be using the C++ locale
>>>>>>> class and associated API. Otherwise users of our libraries may suffer from
>>>>>>> subtle bugs if reading and writing files in separate threads that are all
>>>>>>> using C locales.
>>>>>>>>
>>>>>>>> Even in some code that uses streams, people still use sscanf, atof,
>>>>>>>> etc. In the long run we probably should address these cases with
>>>>>>>> stream replacements.
>>>>>>>
>>>>>>> We should aim to ensure new code uses C++ streams and imbue, and replace
>>>>>>> existing code with C++ streams. As you say this should probably be part of a
>>>>>>> larger i18n effort which would involve using Unicode strings and other changes
>>>>>>> to our libraries.
>>>>>>>
>>>>>>> Marcus
>>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>
>>>>
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>>
>>
>>
>> --
>> François Bertel, PhD  | Kitware Inc. Suite 204
>> 1 (518) 371 3971 x113 | 28 Corporate Drive
>>                      | Clifton Park NY 12065, USA
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
>



-- 
François Bertel, PhD  | Kitware Inc. Suite 204
1 (518) 371 3971 x113 | 28 Corporate Drive
                      | Clifton Park NY 12065, USA



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