Reading from a file
Author
I'm working on a text-based RPG game and I want all data to be stored in .txt files, so I can edit and test easily. I want it to look something like this in the .txt file:
//Monster ID,lvl,hp,.......
1,54,324,......
I suppose reading these values in an array would be the best, but how do I do? I've read a few tutorials about IO and solved this by first reading the first values with fin.get(char, 100, ','), where fin is the object I created with ifstream. Then fin.eof(); Then ignore until I come to another , and use fin.get again.
This felt like a very bad solution so I guess there must be a better way. I'd really appreciate any help, thanks.
In case you didn't understood my explanation of what I did, just skip it and please tell me a solution to read in these values in an array instead. =)
-Niklas
Here is a cheap and easy way of doing it, I suggest you tinker with it a bit though to get your desired effect
In the text file :
And then in C++
In the text file :
31 54 324And then in C++
std::ifstream in("source.txt");int inInt;in >> inInt;int* attribs = new int[inInt];for(int i=0;i<inInt;i++) in >> attribs;
Personally, I'd go with the overkill approach and use the Boost Spirit Library.
Simple example:
The Boost Spirit library is EXTREMELY flexible, and not too hard to use for simple cases either :-). This example would parse a file like:
Etc...
Simple example:
#include <boost/spirit.hpp>using namespace boost::spirit;#include <fstream>#include <string>#include <vector>using namespace std;struct monster{ string name; unsigned int id; unsigned int level; unsigned int hp;};void load_some_rpg_data( void ){ ifstream file( "data.txt" ); vector< monster > monsters; while ( file ) { string line; getline( file , line ); if ( line.empty() ) continue ; //ignore blank lines monster m; parse( line.begin() , line.end() , (+( anychar_p - ',' )) //read 1 or more (+) characters that arn't commas... [ assign_a( m.name ) ] //...and assign the whole shebang to m.name >> "," >> uint_p[ assign_a( m.id ) ] //read a comma, then an unsigned integer, and assign it to m.id >> "," >> uint_p[ assign_a( m.level ) ] //read a comma, then an unsigned integer, and assign it to m.level >> "," >> uint_p[ assign_a( m.hp ) ] //read a comma, then an unsigned integer, and assign it to m.hp ); monsters.push_back( m ); }}The Boost Spirit library is EXTREMELY flexible, and not too hard to use for simple cases either :-). This example would parse a file like:
Ogart the Ugly,1,1,10Your mom,2,10000,10000Knight of the Pie,3,14159,26535Etc...
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