• Sam Hu <samhudotsamhu gmail.com> May 20 2009
• BLS <windevguy hotmail.de> May 20 2009
• "Tyro[a.c.edwards]" <nospam home.com> May 20 2009

Sam Hu <samhudotsamhu gmail.com> writes:

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");
inData>>name;
inData>>gender;
inData>>age;

cout<<"Info:"<<endl
       <<"Name:"<<name<<endl
       <<"Gender:"<<gender<<endl
       <<"Age:"<<age<<endl;

BLS <windevguy hotmail.de> writes:

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");
 inData>>name;
 inData>>gender;
 inData>>age;
 
 cout<<"Info:"<<endl
        <<"Name:"<<name<<endl
        <<"Gender:"<<gender<<endl
        <<"Age:"<<age<<endl;
 
 
 


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

"Tyro[a.c.edwards]" <nospam home.com> writes:

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");
 inData>>name;
 inData>>gender;
 inData>>age;

 cout<<"Info:"<<endl
 <<"Name:"<<name<<endl
 <<"Gender:"<<gender<<endl
 <<"Age:"<<age<<endl;


 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.