Converting Mod types to Character types...

Converting Mod types to Character types...

[chris.danx]

Hi,
    I've got my interface to Vx thing working but i want to display the contents
of the information it retrieves.  I've got Interfaces.C.Unsigned_Char types in
an array and this maps to a Mod type in GNAT.  I've tried allsorts of
conversions between a single C.UC to character and unsigned conversions too.
How do i convert between them?  It's annoying since this is the only thing
that's not working, everything else is.

Thanks,
Chris Campbell

RE: Converting Mod types to Character types...

[Beard, Frank]

Since Interfaces.C does not supply a "To_Ada" function for
unsigned_char as it does for the other character types, and
you presumably aren't supposed to assume a correlation between
Interfaces.C.char and Interfaces.C.unsigned_char, then you
will have to convert it yourself.

This is assuming you're asking how to convert between 
Interfaces.C.unsigned_char and character, then the simplest
way is probably:

  char : character := ' ';
  uc   : Interfaces.C.unsigned_char := 65;
  
begin

  char := character'val(integer(uc));  -- char is now 'A'


Is this what you were asking?

Frank

-----Original Message-----
From: chris.danx [mailto:chris.danx@ntlworld.com]
Sent: Monday, May 14, 2001 6:50 PM
To: comp.lang.ada@ada.eu.org
Subject: Converting Mod types to Character types...


Hi,
    I've got my interface to Vx thing working but i want to display the
contents
of the information it retrieves.  I've got Interfaces.C.Unsigned_Char types
in
an array and this maps to a Mod type in GNAT.  I've tried allsorts of
conversions between a single C.UC to character and unsigned conversions too.
How do i convert between them?  It's annoying since this is the only thing
that's not working, everything else is.

Thanks,
Chris Campbell


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comp.lang.ada@ada.eu.org
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RE: Converting Mod types to Character types...

[Beard, Frank]

Actually, since modular types fall into the universal integer
category, the conversion is even easier:

  char : character := ' ';
  uc   : Interfaces.C.unsigned_char := 65;
  
begin

  char := character'val(uc);  -- char is now 'A'

Frank

-----Original Message-----
From: chris.danx [mailto:chris.danx@ntlworld.com]
Sent: Monday, May 14, 2001 6:50 PM
To: comp.lang.ada@ada.eu.org
Subject: Converting Mod types to Character types...


Hi,
    I've got my interface to Vx thing working but i want to display the
contents
of the information it retrieves.  I've got Interfaces.C.Unsigned_Char types
in
an array and this maps to a Mod type in GNAT.  I've tried allsorts of
conversions between a single C.UC to character and unsigned conversions too.
How do i convert between them?  It's annoying since this is the only thing
that's not working, everything else is.

Thanks,
Chris Campbell


_______________________________________________
comp.lang.ada mailing list
comp.lang.ada@ada.eu.org
http://ada.eu.org/mailman/listinfo/comp.lang.ada

Re: Converting Mod types to Character types...

[chris.danx]

"Beard, Frank" <beardf@spawar.navy.mil> wrote in message
news:mailman.989883373.1404.comp.lang.ada@ada.eu.org...
> Actually, since modular types fall into the universal integer
> category, the conversion is even easier:
>
>   char : character := ' ';
>   uc   : Interfaces.C.unsigned_char := 65;
>
> begin
>
>   char := character'val(uc);  -- char is now 'A'
>
> Frank

It works now.

Thanks,
Chris Campbell