How can I serialize a struct into a file in the style of C?

[Mike Parker via Digitalmars-d-learn]

On Saturday, 22 July 2017 at 01:45:29 UTC, solidstate1991 wrote:
> Due to it's convenience, I was thinking on reading and writing 
> file headers by creating structs mirroring the layouts of 
> actual headers I would need. I've seen many examples of this in 
> C, however I' struggling using the same methods through the use 
> of code.stdc.stdio, especially as I can't really trace bugs 
> from fread.

struct Data {
     int x;
     float y;
     ubyte z;
}

void main() {
     import core.stdc.stdio;

     Data od = Data(10, 3.0f, 5);

     FILE* fp = fopen("data.dat", "wb");
     size_t ret = fwrite(&od, od.sizeof, 1, fp);
     fclose(fp);

     assert(ret == 1);

     Data id;
     fp = fopen("data.dat", "rb");
     ret = fread(&id, id.sizeof, 1, fp);
     fclose(fp);

     assert(ret == 1);

     assert(id.x == 10);
     assert(id.y == 3.0f);
     assert(id.z == 5);
}