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Full Discussion: writing binary/struct data to file
Top Forums Programming writing binary/struct data to file Post 302318825 by jim mcnamara on Friday 22nd of May 2009 10:40:32 AM
Old 05-22-2009
You are not writing tinner to the file - just a pointer which means nothing when you try to read the file try:
Code:
#include <stdlib.h>
#include <stdio.h>

struct tinner {
  int j;
  int k[3];
};

struct touter {
  int i;
  struct tinner inner;
};

int main() {
        struct touter data;
        data.i = 10;

       
        data.inner.j = 5;
        data.inner.k[0] = 1, data.inner.k[1] = 2, data.inner.k[2] = 3;
        

        printf("sizeof(data)=%d\n", sizeof(data) );

        FILE *fp = fopen("test.dat", "w+b");
        fwrite((const void *) &data, sizeof(data), 1, fp);
        fflush(fp);
        fclose(fp);
        return 0;
}

 

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LEARN ABOUT BSD

fread

FREAD(3S)																 FREAD(3S)

NAME

       fread, fwrite - buffered binary input/output

SYNOPSIS

       #include <stdio.h>

       fread(ptr, sizeof(*ptr), nitems, stream)
       FILE *stream;

       fwrite(ptr, sizeof(*ptr), nitems, stream)
       FILE *stream;

DESCRIPTION

       Fread reads, into a block beginning at ptr, nitems of data of the type of *ptr from the named input stream.  It returns the number of items
       actually read.

       If stream is stdin and the standard output is line buffered, then any partial output line will be flushed before any  call  to  read(2)	to
       satisfy the fread.

       Fwrite  appends	at  most  nitems  of data of the type of *ptr beginning at ptr to the named output stream.  It returns the number of items
       actually written.

SEE ALSO

       read(2), write(2), fopen(3S), getc(3S), putc(3S), gets(3S), puts(3S), printf(3S), scanf(3S)

DIAGNOSTICS

       Fread and fwrite return 0 upon end of file or error.

4th Berkeley Distribution					   May 15, 1985 							 FREAD(3S)
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