Sponsored Content
Top Forums Programming Using fread if the buffer size is not known Post 30507 by jlrodz on Wednesday 23rd of October 2002 09:24:40 AM
Old 10-23-2002
Using fread if the buffer size is not known

Hi...

I am trying to read a binary data that have different types of messages of different lengths. I am using fread() but this functions needs the size and count to read the buffer from the file. I think this may cause that the buffer overlaps other messages.

Is there an alternative to read from a binary file without specifying the length?
 

9 More Discussions You Might Find Interesting

1. AIX

Pipe Buffer Size

Hi:- One of our users is getting an error: "There is no process to read data written to a pipe.” I am trying to find out what the pipe buffer size is currently set to. How do I go about this? Thanks, (0 Replies)
Discussion started by: janet
0 Replies

2. Red Hat

buffer cache size

hi everyone, can any one help change the buffer cache size in redhat and suse?? this error i got when i installed oracle 10g and it went well and when i try to mount the database using startup cmd it says too many buffer cache parameters (error code : ora-1034) thnq in advance (0 Replies)
Discussion started by: gsr_kashyap
0 Replies

3. UNIX for Advanced & Expert Users

How to increase the buffer size in Unix

When I checked with top command, I found tht my buffers are always 137M, which means that they are sort of overloaded. My Inactive memory is 520M. Is it possible to increaase the buffer size and what would be the command for that? (0 Replies)
Discussion started by: ziabegg
0 Replies

4. UNIX for Dummies Questions & Answers

How to increase buffer size in Unix

The "top" command shows that my buffer size is always at 137M, which I think has reached to the maximum. However, Ido have lots of Inative memory? Is it possible to increae the buffer size? and what is the command for that? Further, this is the buffer for writing to the hard disk? (3 Replies)
Discussion started by: ziabegg
3 Replies

5. Shell Programming and Scripting

Expect buffer size increase, please help

Hi Group, I am struggling to increase buffer size of expect, sometimes after increasing the buffer size, expect captures all my expected output, sometimes not, :-( I tried match_max 700000 set expect_out(buffer) {} Could anybody guide me for any solution. HTH,... (1 Reply)
Discussion started by: jaduks
1 Replies

6. Programming

erase fread 's internal buffer ?

When fread is used twice, the second time it seems to overwrite the first time's output. Is there any way to clear fread's internal buffer after each use ? char *FILEREAD(const char *FILENAME) { static char READBUFFER = ""; READBUFFER = '\0'; // try to solve the problem but this will not... (2 Replies)
Discussion started by: limmer
2 Replies

7. Shell Programming and Scripting

sftp Invalid buffer size

For the above one I am getting an error like Invalid buffer size ...Could some one help (3 Replies)
Discussion started by: infernalhell
3 Replies

8. UNIX for Dummies Questions & Answers

Decrease buffer size

Hi, I am using the below command to get the output in a file called "Logs.txt" tail -f filename | egrep -i "cpu | hung " >> Logs.txt The problem is the Logs.txt file gets updated only after the buffer is 8Kb, but i want to update the file immediately and not wait for the buffer to get 8kb. Is... (8 Replies)
Discussion started by: @bhi
8 Replies

9. Programming

[c] How to calculate size of the file from size of the buffer?

Hi, Can I find size of the file from size of the buffer written? nbECRITS = fwrite(strstr(data->buffer, ";") + 1, sizeof(char), (data->buffsize) - LEN_NOM_FIC, fic_sortie); Thank You :) (1 Reply)
Discussion started by: ezee
1 Replies
FREAD(3)						     Linux Programmer's Manual							  FREAD(3)

NAME
fread, fwrite - binary stream input/output SYNOPSIS
#include <stdio.h> size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream); size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream); DESCRIPTION
The function fread reads nmemb elements of data, each size bytes long, from the stream pointed to by stream, storing them at the location given by ptr. The function fwrite writes nmemb elements of data, each size bytes long, to the stream pointed to by stream, obtaining them from the loca- tion given by ptr. For non-locking counterparts, see unlocked_stdio(3). RETURN VALUE
fread and fwrite return the number of items successfully read or written (i.e., not the number of characters). If an error occurs, or the end-of-file is reached, the return value is a short item count (or zero). fread does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred. CONFORMING TO
The functions fread and fwrite conform to ANSI X3.159-1989 (``ANSI C''). SEE ALSO
read(2), write(2), feof(3), ferror(3), unlocked_stdio(3) BSD MANPAGE
1996-05-17 FREAD(3)
All times are GMT -4. The time now is 06:47 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy