fwrite in Linux and UNIX


 
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Old 08-13-2008
See, the int is stored as 00 00 00 0a on 'Pux and 00 0a 00 00 on Linux. Similarly, the floats have their byte pairs the other way around. The byte order of the architectures differ. So what you can do is store the data in a format which is independent of the machine's native byte order. Google for "network byte order" if you really don't think a textual format would be better (and when you eventually realize it would have been better after all, come back here so we can say "told you so", smirk).
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fwrite(3C)						   Standard C Library Functions 						fwrite(3C)

NAME
fwrite - binary output SYNOPSIS
#include <stdio.h> size_t fwrite(const void *ptr, size_t size, size_t nitems, FILE *stream); DESCRIPTION
The fwrite() function writes, from the array pointed to by ptr, up to nitems elements whose size is specified by size, to the stream pointed to by stream. For each object, size calls are made to the fputc(3C) function, taking the values (in order) from an array of unsigned char exactly overlaying the object. The file-position indicator for the stream (if defined) is advanced by the number of bytes successfully written. If an error occurs, the resulting value of the file-position indicator for the stream is unspecified. The st_ctime and st_mtime fields of the file will be marked for update between the successful execution of fwrite() and the next successful completion of a call to fflush(3C) or fclose(3C) on the same stream or a call to exit(2) or abort(3C). RETURN VALUES
The fwrite() function returns the number of elements successfully written, which might be less than nitems if a write error is encountered. If size or nitems is 0, fwrite() returns 0 and the state of the stream remains unchanged. Otherwise, if a write error occurs, the error indicator for the stream is set and errno is set to indicate the error. ERRORS
Refer to fputc(3C). USAGE
Because of possible differences in element length and byte ordering, files written using fwrite() are application-dependent, and possibly cannot be read using fread(3C) by a different application or by the same application on a different processor. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
write(2), fclose(3C), ferror(3C), fopen(3C), fread(3C), getc(3C), gets(3C), printf(3C), putc(3C), puts(3C), attributes(5), standards(5) SunOS 5.10 24 Jul 2002 fwrite(3C)