Re: 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);
}