12-07-2004
I asked some mates, they said that the reason maybe because of the different byte-order between UNIX and Linux. But I don't know how to handle such problem.
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FREAD(3) BSD Library Functions Manual FREAD(3)
NAME
fread, fwrite -- binary stream input/output
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
size_t
fread(void * restrict ptr, size_t size, size_t nmemb, FILE * restrict stream);
size_t
fwrite(const void * restrict ptr, size_t size, size_t nmemb, FILE * restrict stream);
DESCRIPTION
The function fread() reads nmemb objects, each size bytes long, from the stream pointed to by stream, storing them at the location given by
ptr.
The function fwrite() writes nmemb objects, each size bytes long, to the stream pointed to by stream, obtaining them from the location given
by ptr.
Mixing fread() and fwrite() calls without setting the file position explicitly using fsetpos(3) between read and write or write and read
operations will lead to unexpected results because of buffering the file pointer not being set to the expected position after each operation
completes. This behavior is allowed by ANSI C for efficiency and it will not be changed.
RETURN VALUES
The functions fread() and fwrite() advance the file position indicator for the stream by the number of bytes read or written. They return
the number of objects read or written. If size or nmemb is 0, the functions return 0 and the state of stream remains unchanged. If an error
occurs, or the end-of-file is reached, the return value is a short object count (or zero).
The function fread() does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which
occurred. The function fwrite() returns a value less than nmemb only if a write error has occurred.
SEE ALSO
read(2), write(2)
STANDARDS
The functions fread() and fwrite() conform to ANSI X3.159-1989 (``ANSI C89'').
BSD
September 11, 2011 BSD