Getting data from text in C/C++
Author
How can I read and get the data that I want from a text file in C/C++.
For example I have a text file contains the following text.
OBJECT_NAME: “F-16”;
VERTEX_COUNT: 9;
FACE_COUNT: 3;
DAMAGE: 0.0;
COLLIDE: FALSE;
How can I get the “F-16” and put it in: char *Object_Name;
The VERTEX_COUNT: 9 in: int Vertex_Count;
the DAMAGE: 0.0 in: float Damage;
and the COLLIDE: FALSE in: BOOL Collide;
Help me please!!!
I’ll be grateful for your help.
Here's the basic procedure using the Standard C++ Library.
1 - Read in a line
2 - Parse the string using a simple string tokenizer for example.
3 - Now use the data as you wish
Now just loop though the entire file and add in the code to handle all the cases. This is just one way of doing this.
1 - Read in a line
ifstream IF("file.txt");std::string tempStr;std::getline( IF, tempStr );// tempStr == OBJECT_NAME: “F-16”;2 - Parse the string using a simple string tokenizer for example.
std::vector<std::string> tokens = tokenize(tempStr, ": ;\"");// tokens[0] == OBJECT_NAME// tokens[1] == F-163 - Now use the data as you wish
if( tokens[0] == "OBJECT_NAME" ) objects[current]->name = tokens[1]; else if( tokens[0] == "COLLIDE" ) ) { if( tokens[1] == "FALSE") objects[current]->collide = 0; } ...Now just loop though the entire file and add in the code to handle all the cases. This is just one way of doing this.
I used a similar approach, except that I ignore lines that start with "/"...
so...
//Speed
125
//Size
10
and so on...
then I read the stuff using what the above poster said (kind of).
so...
//Speed
125
//Size
10
and so on...
then I read the stuff using what the above poster said (kind of).
Author
I believe that people here are really awesome although I haven’t tried yet so far.
Thank for your helpful responses!
Thank for your helpful responses!
I tried to do the same, but my compiler doesnt recognise :resToken = tokenize(tempStr, "\t");
I inculed these lines at the top:
#include "stdafx.h"
#include <vector>
using namespace std;
#include <string>
My code is like this:
ifstream IF("file.txt");
std::string tempStr;
std::getline( IF, tempStr );
std::vector<std::string>
resToken = tokenize(tempStr, "\t");
I get this error:
test.cpp(111) : error C2065: 'tokenize' : undeclared identifier
I inculed these lines at the top:
#include "stdafx.h"
#include <vector>
using namespace std;
#include <string>
My code is like this:
ifstream IF("file.txt");
std::string tempStr;
std::getline( IF, tempStr );
std::vector<std::string>
resToken = tokenize(tempStr, "\t");
I get this error:
test.cpp(111) : error C2065: 'tokenize' : undeclared identifier
A really simple way, if all your data is in that format, is GetPrivateProfileString(), for reading ini files.
MUST BE:
object_name = f-16
One function call.
I think you can try standard_io functions.
My codes is :
//
// I assume that you have a txt file in c:/test.txt ;
// Also I assume in that "test.txt" you type "name:f-16;" .
//
#include "stdio.h"
main()
{
// open the file
FILE* pf=fopen( "c:/test.txt","r" ) ;
char result[20] ;
fscanf( pf,"name:%s;",result) ;
fclose( pf ) ;
printf("the name is:%s \n",result) ;
return 0;
}
I hope you would try this codes.And I also hope the codes have some suggestion.
If the codes do not work ,please tell me.(Email:jfwf@yeah.net).
Good Luck!
[Edited by - jf_wangfeng on August 26, 2005 10:56:54 PM]
My codes is :
//
// I assume that you have a txt file in c:/test.txt ;
// Also I assume in that "test.txt" you type "name:f-16;" .
//
#include "stdio.h"
main()
{
// open the file
FILE* pf=fopen( "c:/test.txt","r" ) ;
char result[20] ;
fscanf( pf,"name:%s;",result) ;
fclose( pf ) ;
printf("the name is:%s \n",result) ;
return 0;
}
I hope you would try this codes.And I also hope the codes have some suggestion.
If the codes do not work ,please tell me.(Email:jfwf@yeah.net).
Good Luck!
[Edited by - jf_wangfeng on August 26, 2005 10:56:54 PM]
This topic is closed to new replies.
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