HELP NEEDED FOR CONVERTING FROM CHAR TO INTEGER!!!

[sergelaurent]

I have got a variable which contains a char. I want to convert it into a interger to be able to use it in the following espression
expr $a*56 where a is my variable

Can someone give me some tips to do it?

Thanks,
lolo

 

[Bong]

If I understand the question, you want to turn a character into its 8-bit integer representation.
scan $a %c var will take the character (must be a single character0 in the variable a and put its decimal value in the variable var.

_________________
Bob Rashkin
rrashkin@csc.com

 

[sergelaurent]

Thanks Bong, I tried your code but it does not work for every caracters.

For example, if I have a Unicode caracter, the decimal returned by scan is not exact. one example is
set num "?"
scan $num %c conver
puts $conver
ans: 63 instead of 2

So, I wanted to know if you could help me to solve this problem.

Cheers,
lolo

 

[LF28]

Do you want to obtain the ASCII code of your char?
Then use:

binary scan c $conver result
puts "ASCII of $conver is $result"

Tobi

 

[Bong]

According to my notes, 63 IS the character code for "?".

_________________
Bob Rashkin
rrashkin@csc.com

 

[sergelaurent]

Hello Bong,
Your notes are right, 63 corresponds to the caracter "?"
I think that when saving the document, the caracter ? for example is replaced by ? as when saving using notepad, I got a warning saying that unicode caracters will be lost when saving under ASCII format

cheers
lolo

 

[Bong]

I've never worked with unicode characters. Are they 2 bytes? What does your code look like and what does it do?

_________________
Bob Rashkin
rrashkin@csc.com

 

[sergelaurent]

In fact, the data are coded in binary. When I read and copy them, in the result, I noticed that it added an '\n' that is '0D0A' in hexadecimal. In fact, instead of adding a new line feed only, it writes a return carriage and a new line feed. Have you ever come upon this problem? Can you help me?

I was wondering if the caracter '\n' was not a special caracter as I was not able to dissociate the 0D octet from the 0A octet

Thanks
lolo

 

[Bong]

Yes I have. I'm not sure you're experiencing the same thing as I did but to read a file as BINARY, you need to specify the translation on the channel (which defaults to ASCII).
set fid [open <filename> r]
[red]fconfigure $fid -translation binary[/red]

This will suppress the reading of 0A as linefeed. Of course, you do the same thing on a "w" channel. Also, if your using puts, specify -nonewline to avoid adding new lines.

_________________
Bob Rashkin
rrashkin@csc.com

 

[sergelaurent]

Thanks a lot Bong, it is just working fine now.
Cheers
lolo