Passing string array to C

[Andre Pany via Digitalmars-d-learn]

Hi,

I have this coding. Function `sample` will later be called from C
and should provide access to a string array.

I tried to read the string values after the function call
and I can access the first string, but for the second string,
there is an access violation.

Why does it crash?

Kind regards
André

```
import std;

void main()
{
        size_t* i;
        const(wchar)* r;
        sample(&r, &i);

        // Try to read the 2 string values
        const(wchar) ** r2;
        r2 = &r;
        auto arr = r2[0..*i];
        writeln(to!string(arr[0])); // Works
        writeln(to!string(arr[1])); // Fails
}

extern(C) export void sample(const(wchar)** r, size_t** c)
{
        string[] arr = ["fooä", "bar"];
        auto z = new const(wchar)*[arr.length];
        foreach(i, ref p; z)
        {
                p = toUTF16z(arr[i]);
        }
        
        *r = z[0];
        
        *c = new size_t();
        **c = arr.length;
}
```