RE: [Dev-C++] FILE positionning problem.

[Ioannis V. <iv...@em...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf Of Provic
> Sent: Monday, July 07, 2003 5:31 PM
> To: dev...@li...
> Subject: Re: [Dev-C++] FILE positionning problem.
>
> void func()

I assume you play in C, so make th above void func(void)



void func() and void func(void) are not the same thing in C. In C empty
parenthesis means to not make any argument checking.


For example if you do func(7); and func(NULL); you will get no error
messages.




> {
>    FILE *Fcarte;
>    long int pos;       //   Position
>    char Charou;      //   The character, converted in char
>    int ICharou;      //      The original character
> 
>    Fcarte=fopen(carte, "r");


What is carte. It should be "carte".



>    if (Fcarte==NULL)
>    {
>        printf("Impossible d'ouvrir de fichier bsp.\n");
>        return;
>    }
> 
> while(1)
>        {
>        pos = ftell(Fcarte);   


Useless.

                            //      
> _________________Nb 1
>        ICharou=fgetc(Fcarte);
>            /*         if (ICharou==EOF)               // Here 
> were there 
> an EOF test : I removed it, it did bug a lot (?)
>                        break;            */
> 
>        Charou=(char) ICharou;



There is no need for casting here.



>                                                                   /*  
> [stuff, using Charou...] */
> 
>        fseek(Fcarte, pos+1, SEEK_SET);      


Useless (in theory, but you said you had problems?).




> _________________Nb 2
>       }
> 
> }
> 
> before adding Nb1 and Nb2, it worked too buggly (?). thereafter, it 
> works too slowly (normal).
> 
> Hoping you will help, Thankssssss



Assuming you have the file named "carte" (without any extension) run the
following code:


#include <stdio.h>
#include <stdlib.h>


int main(void)
{
 FILE *Fcarte=fopen("carte" ,"r");
 
 char c;
 
 int input;

 if(Fcarte==NULL)
 {
 	fprintf(stderr, "\nMen the lifeboats. Women and children
first!\n\n");

 	return EXIT_FAILURE;
 }
 
 while((input=fgetc(Fcarte))!=EOF)
 {
 	c=input;

 	/* Do whatever you want with c */

 	printf("File pos: %ld\n", ftell(Fcarte));

 }


 printf("\n\nIn theory the file pointer was advancing 1 long at a time\n");
 
 return 0;
}
 
 

The results in my system:


C:\c>copy con carte
I have a mission to my life
^Z
        1 file(s) copied.

C:\c>temp
File pos: 1
File pos: 2
File pos: 3
File pos: 4
File pos: 5
File pos: 6
File pos: 7
File pos: 8
File pos: 9
File pos: 10
File pos: 11
File pos: 12
File pos: 13
File pos: 14
File pos: 15
File pos: 16
File pos: 17
File pos: 18
File pos: 19
File pos: 20
File pos: 21
File pos: 22
File pos: 23
File pos: 24
File pos: 25
File pos: 26
File pos: 27
File pos: 29


In theory the file pointer was advancing 1 long at a time

C:\c>



Ioannis Vranos
 
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