Every now and then this topic rears it's ugly head but there seem to be no real solution for to the problem. I'm trying to scan a string (char[]) from a text document or from stdin. What is the correct way to do this? I am aware of the readLine and readString functions available in stream.d but this is not exactly what I'm looking for. Additionally I  could:

char[] str;
char[80] s;
scanf("%s",cast(char*)s);

str = toStringz(s);

but this does not alleviate the problem. Since dynamic string (char[]) guards against array overrunning, it is my first choice when considering string input. I think this is a problem that needs to be remedied, especially for novice programmers (not to say that we are the only ones that use such features), prior to v1.0?

"Andrew Edwards" <remove_ridimz@remove_yahoo.com> wrote in message
news:c0ol66$28jl$1@digitaldaemon.com...
| Every now and then this topic rears it's ugly head but there seem to be
| no real solution for to the problem. I'm trying to scan a string
| (char[]) from a text document or from stdin. What is the correct way to
| do this? I am aware of the readLine and readString functions available
| in stream.d but this is not exactly what I'm looking for. Additionally I
|   could:
|
| char[] str;
| char[80] s;
| scanf("%s",cast(char*)s);
|
| str = toStringz(s);
|
| but this does not alleviate the problem. Since dynamic string (char[])
| guards against array overrunning, it is my first choice when considering
| string input. I think this is a problem that needs to be remedied,
| especially for novice programmers (not to say that we are the only ones
| that use such features), prior to v1.0?

Did you try the scanf method in std.stream instead of the std.c.scanf?
 stdin.scanf("%.s",&str);

Ben Hinkle wrote:
> "Andrew Edwards" <remove_ridimz@remove_yahoo.com> wrote in message
> news:c0ol66$28jl$1@digitaldaemon.com...
> | Every now and then this topic rears it's ugly head but there seem to be
> | no real solution for to the problem. I'm trying to scan a string
> | (char[]) from a text document or from stdin. What is the correct way to
> | do this? I am aware of the readLine and readString functions available
> | in stream.d but this is not exactly what I'm looking for. Additionally I
> |   could:
> |
> | char[] str;
> | char[80] s;
> | scanf("%s",cast(char*)s);
> |
> | str = toStringz(s);
> |
> | but this does not alleviate the problem. Since dynamic string (char[])
> | guards against array overrunning, it is my first choice when considering
> | string input. I think this is a problem that needs to be remedied,
> | especially for novice programmers (not to say that we are the only ones
> | that use such features), prior to v1.0?
> 
> Did you try the scanf method in std.stream instead of the std.c.scanf?
>  stdin.scanf("%.s",&str);
> 
> 
No didn't try that! Trying now! Sorry...Doesn't work.

char[] str;
stdin.scanf("%.s",&str);
printf(str);

results in:

C:\>test
Error: Access Violation

Ben Hinkle wrote:

> "Andrew Edwards" <remove_ridimz@remove_yahoo.com> wrote in message
> news:c0ol66$28jl$1@digitaldaemon.com...
> | Every now and then this topic rears it's ugly head but there seem to be
> | no real solution for to the problem. I'm trying to scan a string
> | (char[]) from a text document or from stdin. What is the correct way to
> | do this? I am aware of the readLine and readString functions available
> | in stream.d but this is not exactly what I'm looking for. Additionally I
> |   could:
> |
> | char[] str;
> | char[80] s;
> | scanf("%s",cast(char*)s);
> |
> | str = toStringz(s);
> |
> | but this does not alleviate the problem. Since dynamic string (char[])
> | guards against array overrunning, it is my first choice when considering
> | string input. I think this is a problem that needs to be remedied,
> | especially for novice programmers (not to say that we are the only ones
> | that use such features), prior to v1.0?
> 
> Did you try the scanf method in std.stream instead of the std.c.scanf?
>  stdin.scanf("%.s",&str);
> 


&str is very different from cast(char*)str, and cast(char*)str is also very different from str.

Stream's scanf seems to be broken. When I do this:
stdin.scanf("%3s", cast(char*)s);
it will keep on writing past 3 characters. The C scanf from std.c.stdio handles it correctly, but I can't get it to read the string length from the stack like we do with printf.


-- 
Christopher E. Miller
www.dprogramming.com
irc.dprogramming.com #D

> char[] str;
> stdin.scanf("%.s",&str);
> printf(str);
> 
> results in:
> 
> C:\>test
> Error: Access Violation
Should that be %.*s or %s?
I don't know, just wondering...
Sam

Sam McCall wrote:
>> char[] str;
>> stdin.scanf("%.s",&str);
>> printf(str);
>>
>> results in:
>>
>> C:\>test
>> Error: Access Violation
> 
> Should that be %.*s or %s?
> I don't know, just wondering...
> Sam
Yes! It should be %.*s, but since that hadn't worked in former attempts, I'll give any suggestion a try, maybe he stumbled onto something I overlooked. As it were, that wasn't the case. The std.c.scanf() never has never worked, and it seems that steam.scanf() broke along the way.

Andrew

"Sam McCall" <tunah.d@tunah.net> wrote in message
news:c0q2mq$1g60$1@digitaldaemon.com...
| > char[] str;
| > stdin.scanf("%.s",&str);
| > printf(str);
| >
| > results in:
| >
| > C:\>test
| > Error: Access Violation
| Should that be %.*s or %s?

oops. that should be %.*s


| I don't know, just wondering...
| Sam