Simple file manipulation

[Sam Hu]

I looked up in D2  in std.stdio,std.file,std.cstream and std.stream and try to 
find a very simple method which can read from a file once a  value other than 
once an entire row.I just can not find it maybe this idea is wrong.Say how to 
simply read  write key/value pairs to and from a file like this format:

//file data.dat
Tommy M 22

where the keys are name,gender and age while the values are Tommy,M ,22.

I found there is methods that can read from a file once an entire row.But is 
there a simple method which can read once a value?In C++ one can do like this:

#include iosteam
#include fstream
using namespace std;
ifstream inData;
inData.open(data.dat);
inDataname;
inDatagender;
inDataage;

coutInfo:endl
   Name:nameendl
   Gender:genderendl
   Age:ageendl;

Re: Simple file manipulation

[BLS]

Sam Hu wrote:

I looked up in D2  in std.stdio,std.file,std.cstream and std.stream and try to find 
a very simple method which can read from a file once a  value other than once an 
entire row.I just can not find it maybe this idea is wrong.Say how to simply read 
 write key/value pairs to and from a file like this format:

//file data.dat
Tommy M 22

where the keys are name,gender and age while the values are Tommy,M ,22.

I found there is methods that can read from a file once an entire row.But is 
there a simple method which can read once a value?In C++ one can do like this:

#include iosteam
#include fstream
using namespace std;
ifstream inData;
inData.open(data.dat);
inDataname;
inDatagender;
inDataage;

coutInfo:endl
   Name:nameendl
   Gender:genderendl
   Age:ageendl;





IN D2 you can use std.file and slurp (cool name, beside)
slurp reads an entire file into an array.

// Load file; each line is an string followed by whitespace , another 
//string followed by whitespace and a  int.


auto a = slurp!(string, string, int)(data.dat, %s %s %s);

Now you can go on an play a bit with the new range stuff. (std.range)

Enjoy, Björn

Re: Simple file manipulation

[Tyro[a.c.edwards]]

On 5/20/2009 6:19 PM, BLS wrote:

Sam Hu wrote:

I looked up in D2 in std.stdio,std.file,std.cstream and std.stream and
try to find a very simple method which can read from a file once a
value other than once an entire row.I just can not find it maybe this
idea is wrong.Say how to simply read  write key/value pairs to and
from a file like this format:

//file data.dat
Tommy M 22

where the keys are name,gender and age while the values are Tommy,M ,22.

I found there is methods that can read from a file once an entire
row.But is there a simple method which can read once a value?In C++
one can do like this:

#include iosteam
#include fstream
using namespace std;
ifstream inData;
inData.open(data.dat);
inDataname;
inDatagender;
inDataage;

coutInfo:endl
Name:nameendl
Gender:genderendl
Age:ageendl;





IN D2 you can use std.file and slurp (cool name, beside)
slurp reads an entire file into an array.

// Load file; each line is an string followed by whitespace , another
//string followed by whitespace and a int.

auto a = slurp!(string, string, int)(data.dat, %s %s %s);

Now you can go on an play a bit with the new range stuff. (std.range)

Enjoy, Björn


Unfortunately, that will not work. DMD fails with a Stack Overflow 
whenever upon encountering any of the string types (dstring, string, 
char[], wstring, etc...) being passed to this template. Works fine or 
other types as far as I can tell (including arrays).



import std.file;

void main()
{
auto a = slurp!(string)(, %s);
}

results in Stack Overflow during compilation.