Thread: fseek high cpu usage?

hi there:

just a quick question.

i have been working on this code which reads a file that contains information about each frame for animation (blm files). my code is controled my a GUI(slider) and then uses fseek() to locate the frame to be read. a bit like a scraching.

my questions is that, does fseek() eats a lot of cpu power? for example, i tried to cahnge the slider value continusly and the cpu power went stright up.


many many thanks

CHUN

my code looks like this:

Code:

static void blinkenlights_goto(t_blinkenlights* x, t_float frame)
{
 //where the frame comes from the GUI range 0->1
// where x->framge_pos[] is any array which remembers the position
// if each frame in the file x->filed
 char *lineread = (char*) getbytes( BL_MAX_LENGTH );
 int current_frame = x->frame_pos[(int)(frame * (x->frame_no-1))];
 int i, n; 
 
 
 if(frame < 0) post("no negtive numbers, please...");
 else
 {

 // this is the line that i think is eatting up my cpu!!!!!!
 fseek(x->x_filed, current_frame, SEEK_SET);
 
 
 for(i=0; ;i++)
 {
  
  fgets(lineread, BL_MAX_LENGTH, x->x_filed );
  if ( (lineread[0] == '\n')) break;
  
  for(n=0; n<(strlen(lineread)-1); n++)
  {
  
   if(lineread[n] == '0')blinkenlights_pixoff( x, n+1, i+1);
    else blinkenlights_pixon( x, n+1, i+1);
    
    //if(lineread[n] == '0')blinkenlights_pixoff( x, n+1, i+1);
    //else blinkenlights_pixon( x, n+1, i+1);
  }
  
 }
 
 //fseek( x->x_filed, 0L, SEEK_SET );
 }
 
 if ( lineread ) freebytes( lineread, BL_MAX_LENGTH );
}

thanks for your reaply, i will look into it and will be back later

cheers

CHUN