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Full Discussion: fwrite in Linux and UNIX
Top Forums Programming fwrite in Linux and UNIX Post 302224091 by rkraj on Tuesday 12th of August 2008 08:02:25 AM
Old 08-12-2008
Here is my program

#include<stdio.h>
#include<string.h>
struct cross_output_entry
{
char stub_descr[80];
int sort_stub_route;
double arr[20];
};
struct cross_output_type
{
union
{
char rec[8088];
struct cross_output_entry rec2;
};
};

struct cross_output_type cross;
int main()
{
int i;
FILE* fptr;
fptr=fopen("temp.text","wb");
for(i=0;i<5;i++)
{

strcpy(cross.rec2.stub_descr,"122");
cross.rec2.arr[0]=1.0;
cross.rec2.arr[1]=343.1019;
cross.rec2.arr[2]=1000.199;
cross.rec2.arr[3]=0.0;
fwrite( &cross.rec2,
sizeof(struct cross_output_type),
1,
fptr);
}
fclose(fptr);
}


The file temp.text produced in UNIX and LInux has different checksums.
Please help me to get the same check sum as i am involving myself to port application from UNIX to Linux.

Regards
rkraj
 

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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)
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