Question

How to read struct with numbers from binary file in C

Answer 1

#include <stdio.h>
 
struct rectangle
{
    int x, y;
}; 
 
int main(int argc, char **argv) 
{ 
    FILE *f;
    struct rectangle rec;
 
    f = fopen("d:\\data.bin", "rb");
    if (!f)
    {
        printf("Unable to open d:\\data.bin");
        return 1;
    }
    for (int i = 1; i <= 10; i++)
    {
        fread(&rec, sizeof(struct rectangle), 1, f);
        printf("%d %d\n", rec.x, rec.y);
    }
            
     
    fclose(f);
     
    return(0);
}
 
/*

run:

2 1
4 2
6 3
8 4
10 5
12 6
14 7
16 8
18 9
20 10

*/

 

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