[Gambas-user] non printable char "Ⱶ" how to remove from string!!!!!

[Fabien Bodard]

Thank you Bruce :-)... It was really interresting. We can't figure out
how the world was so different and so identical at the same time.
Ascii is old, control sequences too, but they are also always the
underlying tools used on our modern systems and programs.


Oups i've forgotten DEL ... yes asc 127 is not printable. I'm really
curious to know why DEL is on the end of the table ... maybe they have
forget it :-/

The character "Ⱶ" is sometime used as replacement by some monitor for
unradable char. But Monitor like vt100 also have the capabilities to
use characters combination, and a set of different characaters can
give one special char. In thi case the problem is not this character
in fact but only all charaters lower than asc 32.. control chars that
interact with the terminal interpreter or with the textarea of gambas.
In the case of the text area gtk can generate error on unreconised
chars, in the case of terminal maybe too because of the char
combination.




2015-12-30 1:32 GMT+01:00 adamnt42 at ...626... <adamnt42 at ...626...>:
> On Tue, 29 Dec 2015 15:07:53 -0500
> Stephen <sbungay at ...3301...> wrote:
>
>> On 12/29/2015 10:54 AM, Fabien Bodard wrote:
>> > To resume ... in the old past of ascii all standart printer or monitor
>> > can manage ascii and print 32 to 127 chars. So Ansi C provide a
>> > standart function named IsPrint that allow to say if a char was able
>> > to be printed.
>> >
>> > IN 2015... Ascii is known in it's 8 bit format so printable chars are
>> > from 32 to 255.
>> >
>> > Characters lower than 32 are for monitor, modem and printer management.
>> >
>> > Thanks to my terminal studie i'm now able to understand all of that :-).
>> >
>> > It's really interresting to study the past ...
>> >
>>    It's more interesting to have LIVED it and now be working with UTF-8.
>> ASCII was SOOO simple, but also SOOOO restrictive.
>>
>> > 2015-12-29 16:39 GMT+01:00 Fabien Bodard<gambas.fr at ...626...>:
>> >> But is print just take into account the old asci table
>> >>
>> >>
>> >> 2015-12-29 16:35 GMT+01:00 ML<d4t4full at ...626...>:
>> >>> All,
>> >>>
>> >>> I might be utterly wrong, but since Linux normally uses UTF-8, any
>> >>> high-bit-set char may be interpreted as one of the "multibyte char" flags.
>> >>> If isprint() takes this into account, then it's dead right that char by
>> >>> itself is not printable!
>> >>>
>> >>> Hope that helps and makes sense...
>> >>>
>> >>> On 2015-12-29 11:53, Ru Vuott wrote:
>> >>>> Tchao Fabien,
>> >>>> Ru ..  Characters>  to 127 are printable...
>> >>>> uhmmm... excuse me, but I do not understand.
>> >>>> If I test the "printability" :-)  of "characters>  to 127" by using C "isprint()" function (that checks whether the passed character is printable), I obtain only zero results.
>> >>>> Where: "isprint()" function returns a non-zero value (true) if character is printable, else zero (false) if character is NOT printable.
>> >>>>
>> >>>> *****************************************************
>> >>>> #include<stdio.h>
>> >>>> int main() {
>> >>>>        int i, c;
>> >>>>        for (i=128; i<= 255; ++i) {
>> >>>>                c = isprint(i);
>> >>>>                printf("%d     %d\n", i, c);
>> >>>>        }
>> >>>>     return (0);
>> >>>> }
>> >>>> *****************************************************
>> >>>> So, it seems resulting that "characters>  to 127" are NOT printable characters.
>> >>>> Ciao
>
> Yes and no.  Short answer: 129 though 255 are "extended ACSII"  - a very nebulous area.  What is "printable" depends on the "printing device" "character code" set.
> The character "Ⱶ"  is part of a code set I recall being called the "box drawing" set that was used on some CRT "print" devices from a bygone era (aka before Unicode).
> In fact, the fact that I can see and recognize it means something.  The following is a link to an archived article in which you can see the "amazing" things that were done with such code sets in the 1980's.
>
> https://books.google.com.au/books?id=C6JUZUHEBuAC&pg=PA327&lpg=PA327&dq=the+software+bottling+company&source=bl&ots=dCVO1ZWFmo&sig=tzzYiReg3OW8NI65rmBvQXo1GXU&hl=en&sa=X&ved=0ahUKEwiC_PHvqYLKAhXjFqYKHRgrCmc4ChDoAQgwMAA#v=onepage&q=the%20software%20bottling%20company&f=false
>
> cheers
> bruce
>
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>> >>
>> >> --
>> >> Fabien Bodard
>> >
>> >
>>
>>
>> --
>> Kindest Regards
>> Stephen A. Bungay, Prop.
>> Smarts On Site Information Systems
>>
>>
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>
> --
> B Bruen <adamnt42 at ...3379... (sort of)>
>
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-- 
Fabien Bodard