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

[Provic <pr...@wa...>]

See at the bottom...

Per Westermark wrote:

>Why - aren't we supposted to be clairvoyant and simply "see" the problem
>before us in the air :-)
>
>/Per W
>
>On Mon, 7 Jul 2003, Ioannis Vranos wrote:
>
>  
>
>>>-----Original Message-----
>>>From: dev...@li...
>>>[mailto:dev...@li...] On Behalf Of Provic
>>>Sent: Monday, July 07, 2003 11:59 AM
>>>To: dev...@li...
>>>Subject: [Dev-C++] FILE positionning problem.
>>>
>>>
>>>Hi !
>>>My current problem is a little weird : I read in the man-pages that
>>>fgetc increases automatically the position in a current opened file.
>>>So my program reads each character of this file in a while :
>>>it should
>>>do that, but in fact it doesn't.
>>>I resolved that by repositionning each time by fseek (param :
>>>SEEK_SET)
>>>at the right position ; but a file access monitoring daemon showed me
>>>that my program isn't optimised at all, it performs 2 fseek which are
>>>exactly the sames...
>>>Where is the bug ?
>>>I verified my code, no need to include it : no pb here.
>>>      
>>>
>>I think you had better post your code. :)
>>
>>
>>    
>>
So that is my code (no comments, they were in french)

void func()
{
   FILE *Fcarte;
   long int pos;       //   Position
   char Charou;      //   The character, converted in char
   int ICharou;      //      The original character

   Fcarte=fopen(carte, "r");
   if (Fcarte==NULL)
   {
       printf("Impossible d'ouvrir de fichier bsp.\n");
       return;
   }

while(1)
       {
       pos = ftell(Fcarte);                               //      
_________________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;
                                                                  /*  
[stuff, using Charou...] */

       fseek(Fcarte, pos+1, SEEK_SET);        //      _________________Nb 2
      }

}

before adding Nb1 and Nb2, it worked too buggly (?). thereafter, it 
works too slowly (normal).

Hoping you will help, Thankssssss

Hervé