Null symbol cross platform

David V Glasgow dvglasgow at gmail.com
Fri Feb 24 11:36:38 EST 2017


I think you are correct, Richmond.

Blagodarya vi mnogo (transliteration from vague memory, so apologies if mangled).

Best wishes,

David Glasgow

> On 22 Feb 2017, at 2:04 pm, Richmond Mathewson via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Frankly I would just take a look at the Unicode convention's guff:
> 
> U+2205 is a sort of "O" with a slanted line through it:
> 
> http://www.fileformat.info/info/unicode/char/2205/index.htm
> 
> http://www.unicode.org/charts/PDF/U2200.pdf
> 
> If you stare at this PDF long enough you might get a free trip without having to reach for the LSD!
> 
> This is NOT really the problem. What is the problem is whether the stuff "under the hood" in your operating system recognises U+2205 as the null set character or not.
> 
> I would suggest the "quickest route to heaven" is to ask Microsoft and Apple directly.
> 
> This would seem to suggest that Windows has not jettisoned all its pre-Unicode bumf: http://superuser.com/questions/61742/how-to-insert-a-null-character-ascii-00-in-notepad
> 
> While ASCII 00 may result in a null set character being inserted in some Windowsy code, it may not
> be displayed as the "happy" slashed zero.
> 
> Richmond.
> 
> 
> 
> 
> On 2/22/17 3:15 pm, David V Glasgow via use-livecode wrote:
>> Hello, folks.
>> 
>> I already posted this, but no response.  I have a bit more informations and new areas of confusion, so I thought I would try again.
>> 
>> I have a group displaying a number of single character fields which can be clicked on to populate other fields.  Essentially a pick list.  One of the options is the null set character ( the O with a line through it, U+2205).  I have tried to find a cross platform font that displays it on Mac & Win.  I got some apparently duff info that Trebuchet would do the trick,  It is OK on Mac, but appears as the mystery character box on Win standalone.
>> 
>> So I did some more digging, and it is listed among the characters displayed by unicode Arial MS.  So I set the fonts accordingly and again it works fine on Mac, but when I test a build on Windows, I get the mystery box.  This really surprised me.  I did wonder whether I might get the NUL symbol appearing as letters top left to bottom right (U+2400), but the no such character surprised me.
>> 
>> I have never attempted any unicode jiggery pokery - is that what I need to do, and if so, any guidance?
>> 
>> Best wishes,
>> 
>> David Glasgow
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