Re: [Pharo-users] Converting an Array of Characters to a String

[Igor Stasenko]

On 9 November 2016 at 07:49, Dimitris Chloupis 
wrote:

> Not in C but there std::string in C++ similar to our String object.
>
> Strictly speaking , std::string is again not part of C++ per se, it comes
from library that implements such class.


> C char indeed is more a byte array than a string. Actually C won't allow
> to change the string value mainly because it thinks you try to change the
> size which something that is not allowed for arrays anyway, so the only way
> to change a char string aka char array is character by character.
>
> Null termination is why I filled the shared memory with zeros to be on the
> safe side and then added the string and the number on top
>
> just wanted to warn you, to make sure you understand that char[100] is not
string, not in C , not in C++. And, of course, it should not autoconvert to
smalltalk String object(s) in FFI, because many C coders use 'char' as a
default data type to operate with buffers of certain length and to count
their size in bytes.


> On Wed, 9 Nov 2016 at 03:41, Igor Stasenko  wrote:
>
>> What i meant, i wanted to warn Dimitris that
>> char[100]
>> are just array of 100 characters (bytes in C).. and has nothing to do
>> with strings.
>> Do not confuse fixed-length C arrays with strings. There's no 'string'
>> data type in C, and instead they use null-terminated character sequence as
>> a convention. But it is not a fixed-size data.
>>
>> On 9 November 2016 at 02:38, Igor Stasenko  wrote:
>>
>>
>>
>> On 8 November 2016 at 14:42, Esteban Lorenzano 
>> wrote:
>>
>> (always with Char100 example in mind):
>>
>> s := MyStructure fromHandle: blah.
>> string := s data readString.
>>
>> should work.
>>
>>
>> IIRC, #readString works correctly only  for correctly null-terminated
>> strings. If not, it will read beyond the structure size , until it find a
>> zero byte somewhere in memory,
>> and thus, results may vary :)
>>
>>
>> Esteban
>>
>>
>> > On 8 Nov 2016, at 14:31, Dimitris Chloupis 
>> wrote:
>> >
>> > I feel like stupid but I cannot find a way to convert an Array of
>> Characters to a String , I can do with a do: and join characters converted
>> to strings to a single string but it feels too many steps.
>> >
>> > Is there a simpler way ?
>>
>>
>>
>>
>>
>> --
>> Best regards,
>> Igor Stasenko.
>>
>>
>>
>>
>> --
>> Best regards,
>> Igor Stasenko.
>>
>


-- 
Best regards,
Igor Stasenko.

Re: [Pharo-users] Converting an Array of Characters to a String

[Dimitris Chloupis]

Not in C but there std::string in C++ similar to our String object.

C char indeed is more a byte array than a string. Actually C won't allow to
change the string value mainly because it thinks you try to change the size
which something that is not allowed for arrays anyway, so the only way to
change a char string aka char array is character by character.

Null termination is why I filled the shared memory with zeros to be on the
safe side and then added the string and the number on top

On Wed, 9 Nov 2016 at 03:41, Igor Stasenko  wrote:

> What i meant, i wanted to warn Dimitris that
> char[100]
> are just array of 100 characters (bytes in C).. and has nothing to do with
> strings.
> Do not confuse fixed-length C arrays with strings. There's no 'string'
> data type in C, and instead they use null-terminated character sequence as
> a convention. But it is not a fixed-size data.
>
> On 9 November 2016 at 02:38, Igor Stasenko  wrote:
>
>
>
> On 8 November 2016 at 14:42, Esteban Lorenzano 
> wrote:
>
> (always with Char100 example in mind):
>
> s := MyStructure fromHandle: blah.
> string := s data readString.
>
> should work.
>
>
> IIRC, #readString works correctly only  for correctly null-terminated
> strings. If not, it will read beyond the structure size , until it find a
> zero byte somewhere in memory,
> and thus, results may vary :)
>
>
> Esteban
>
>
> > On 8 Nov 2016, at 14:31, Dimitris Chloupis 
> wrote:
> >
> > I feel like stupid but I cannot find a way to convert an Array of
> Characters to a String , I can do with a do: and join characters converted
> to strings to a single string but it feels too many steps.
> >
> > Is there a simpler way ?
>
>
>
>
>
> --
> Best regards,
> Igor Stasenko.
>
>
>
>
> --
> Best regards,
> Igor Stasenko.
>

Re: [Pharo-users] Converting an Array of Characters to a String

[Igor Stasenko]

What i meant, i wanted to warn Dimitris that
char[100]
are just array of 100 characters (bytes in C).. and has nothing to do with
strings.
Do not confuse fixed-length C arrays with strings. There's no 'string' data
type in C, and instead they use null-terminated character sequence as a
convention. But it is not a fixed-size data.

On 9 November 2016 at 02:38, Igor Stasenko  wrote:

>
>
> On 8 November 2016 at 14:42, Esteban Lorenzano 
> wrote:
>
>> (always with Char100 example in mind):
>>
>> s := MyStructure fromHandle: blah.
>> string := s data readString.
>>
>> should work.
>>
>>
> IIRC, #readString works correctly only  for correctly null-terminated
> strings. If not, it will read beyond the structure size , until it find a
> zero byte somewhere in memory,
> and thus, results may vary :)
>
>
>> Esteban
>>
>>
>> > On 8 Nov 2016, at 14:31, Dimitris Chloupis 
>> wrote:
>> >
>> > I feel like stupid but I cannot find a way to convert an Array of
>> Characters to a String , I can do with a do: and join characters converted
>> to strings to a single string but it feels too many steps.
>> >
>> > Is there a simpler way ?
>>
>>
>>
>
>
> --
> Best regards,
> Igor Stasenko.
>



-- 
Best regards,
Igor Stasenko.

Re: [Pharo-users] Converting an Array of Characters to a String

[Igor Stasenko]

On 8 November 2016 at 14:42, Esteban Lorenzano  wrote:

> (always with Char100 example in mind):
>
> s := MyStructure fromHandle: blah.
> string := s data readString.
>
> should work.
>
>
IIRC, #readString works correctly only  for correctly null-terminated
strings. If not, it will read beyond the structure size , until it find a
zero byte somewhere in memory,
and thus, results may vary :)


> Esteban
>
>
> > On 8 Nov 2016, at 14:31, Dimitris Chloupis 
> wrote:
> >
> > I feel like stupid but I cannot find a way to convert an Array of
> Characters to a String , I can do with a do: and join characters converted
> to strings to a single string but it feels too many steps.
> >
> > Is there a simpler way ?
>
>
>


-- 
Best regards,
Igor Stasenko.

Re: [Pharo-users] Converting an Array of Characters to a String

[Bernardo Ezequiel Contreras]

something similar

String withAll: { $a. Character space. $b }.



On Tue, Nov 8, 2016 at 10:52 AM, Dimitris Chloupis 
wrote:

>
>
> On Tue, Nov 8, 2016 at 3:42 PM Nicolai Hess  wrote:
>
>> 2016-11-08 14:31 GMT+01:00 Dimitris Chloupis :
>>
>> I feel like stupid but I cannot find a way to convert an Array of
>> Characters to a String , I can do with a do: and join characters converted
>> to strings to a single string but it feels too many steps.
>>
>> Is there a simpler way ?
>>
>>
>> String newFrom:{ $a . $b . $c }.
>> { $a . $b . $c } as:String.
>>
>>
> Its so weird that
>
> { $a . $b . $c } as:String.
>
> works but
>
> { $a . $b . $c } asString.
>
> does not
>
> the latter returns a string that contains something like
>
> {$S. $e. $d. Character space. $o. $r. $n. $a. $r. $e. C
>
> In any case Thanks Nicolai it works :)
>



-- 
Bernardo E.C.

Sent from a cheap desktop computer in South America.

Re: [Pharo-users] Converting an Array of Characters to a String

[Dimitris Chloupis]

On Tue, Nov 8, 2016 at 3:42 PM Nicolai Hess  wrote:

> 2016-11-08 14:31 GMT+01:00 Dimitris Chloupis :
>
> I feel like stupid but I cannot find a way to convert an Array of
> Characters to a String , I can do with a do: and join characters converted
> to strings to a single string but it feels too many steps.
>
> Is there a simpler way ?
>
>
> String newFrom:{ $a . $b . $c }.
> { $a . $b . $c } as:String.
>
>
Its so weird that

{ $a . $b . $c } as:String.

works but

{ $a . $b . $c } asString.

does not

the latter returns a string that contains something like

{$S. $e. $d. Character space. $o. $r. $n. $a. $r. $e. C

In any case Thanks Nicolai it works :)

Re: [Pharo-users] Converting an Array of Characters to a String

[Esteban Lorenzano]

ah yes, that will work (I was thinking on UFFI and I answered that) :)

> On 8 Nov 2016, at 14:41, Nicolai Hess  wrote:
> 
> 
> 
> 2016-11-08 14:31 GMT+01:00 Dimitris Chloupis  >:
> I feel like stupid but I cannot find a way to convert an Array of Characters 
> to a String , I can do with a do: and join characters converted to strings to 
> a single string but it feels too many steps. 
> 
> Is there a simpler way ? 
> 
> String newFrom:{ $a . $b . $c }.
> { $a . $b . $c } as:String. 
> 

Re: [Pharo-users] Converting an Array of Characters to a String

[Esteban Lorenzano]

(always with Char100 example in mind): 

s := MyStructure fromHandle: blah.
string := s data readString.

should work.

Esteban


> On 8 Nov 2016, at 14:31, Dimitris Chloupis  wrote:
> 
> I feel like stupid but I cannot find a way to convert an Array of Characters 
> to a String , I can do with a do: and join characters converted to strings to 
> a single string but it feels too many steps. 
> 
> Is there a simpler way ? 

Re: [Pharo-users] Converting an Array of Characters to a String

[Nicolai Hess]

2016-11-08 14:31 GMT+01:00 Dimitris Chloupis :

> I feel like stupid but I cannot find a way to convert an Array of
> Characters to a String , I can do with a do: and join characters converted
> to strings to a single string but it feels too many steps.
>
> Is there a simpler way ?
>

String newFrom:{ $a . $b . $c }.
{ $a . $b . $c } as:String.

[Pharo-users] Converting an Array of Characters to a String

[Dimitris Chloupis]

I feel like stupid but I cannot find a way to convert an Array of
Characters to a String , I can do with a do: and join characters converted
to strings to a single string but it feels too many steps.

Is there a simpler way ?