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HOW CAN I USE "ftell" ????

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Old   November 16, 2009, 05:24
Default HOW CAN I USE "ftell" ????
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Herman
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Hi everybody,
I wanna know the end position of a file. So I write this routine:



#include "udf.h"

DEFINE_ON_DEMAND(example)
{
FILE *fp;
long len;

fp=fopen("moment.txt","rb");
if(fp == NULL)
printf("ERROR!!!!");

len=ftell(fp); /*get position at end (length)*/
fclose(fp);
}




Fluent report:

error: ftell : undeclared variable.




WHY ?!?! CAN ANYBODY HELP ME?!
thanks.
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Old   November 16, 2009, 10:18
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If you add
#include <stdio.h>
does this help?

cheers
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Old   November 16, 2009, 10:31
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I have to read the number in a file .txt; the file is like the following:


12.3
43.2
123.4
122.3



HOW CAN I READ THE NUMBER TILL THE END?

ps. In Fluent you have to include only the file header udf.h : #include "udf.h"
pps. sei italiano?
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Old   November 16, 2009, 11:05
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hi enrico,

as far as i know "udf.h" will include some standard IO-functions, but not the more sophisticated ones. Try to include "std.io" and see what happens.
Sorry i am not Italian, my synonym originates from an Italian girl i once knew, but something went wrong as you may perceive easily.

cheers
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Old   November 25, 2009, 08:27
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Quote:
Originally Posted by enry View Post
I have to read the number in a file .txt; the file is like the following:


12.3
43.2
123.4
122.3



HOW CAN I READ THE NUMBER TILL THE END?

ps. In Fluent you have to include only the file header udf.h : #include "udf.h"
pps. sei italiano?
Hi Enrico,
The following code should do the trick:
Code:
#include "udf.h"

DEFINE_ON_DEMAND(example)
{
#if !PARALLEL
   FILE *fp;
   real bubu;

   fp=fopen("moment.txt","r");
   if(fp == NULL)
      Message("ERROR!!!!\n");

   while(!feof(pf))
   {
      fscanf(pf,"%g",&bubu);
   }

   fclose(fp);
#endif
}
Note: it should be run in serial.
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Old   November 26, 2009, 05:16
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Thanks a lot for your reply.
Do you know how can I read only the last number on a .txt file?
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Old   November 26, 2009, 05:21
Default It reads the last number
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Well, my example this is what actually does: it reads the last number from the file. It reads all of them, but only the last remains after it exits the "while" loop.
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Old   November 26, 2009, 06:01
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Oh yes! of course!!!

I compile the following text on fluent, but it reports an error:



#include "udf.h"

DEFINE_ON_DEMAND(example)
{
#if !PARALLEL
FILE *fp;
double bubu;

fp=fopen("moment.txt","r");
if(fp == NULL)
Message("ERROR!!!!\n");

while(!feof(fp))
{
fscanf(fp,"%lf",&bubu);
}

fclose(fp);
#endif

}


Error: example.c: line 13: feof: undeclared variable

I compile it as INTERPRETED. I try also as COMPILED, but it doesn't work.
Do you know if I have to add some header files when I use FEOF ?
An other question: what's the meaning of #if !PARALLEL ?

Thank in advance.
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Old   November 26, 2009, 06:15
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Hi Enrico,
The function feof() is declared in the header stdio.h, which I think is already included by udf.h, but just in case add it:
Code:
#define "udf.h"
#define<stdio.h>
The compiler directive
Code:
#if !PARALLEL ...#endif
specifies that the code works only serial (not parallel).
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Old   November 26, 2009, 06:46
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Thanks a lot for your quikly replies!
IT WORKS (whitout including stdio.h ), but only as compiled!

Thanks!
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