Re: converting D's string to use with C API with unicode

[tsbockman via Digitalmars-d-learn]

On Saturday, 5 December 2020 at 21:55:13 UTC, Jack wrote:
my code now look like this, still there's a memory corrupt. 
Could anyone help point out where is it?

...

foreach(i; 0..output.length) {
    wstring ws;
    transcode(output[i], ws);
    auto s = malloc(ws.length + 1);
    if(!s) {
        onOutOfMemoryError();
    }
    memcpy(s, ws.ptr, ws.length);

`ws.length` is the length in `wchar`s, but `memcpy` expects the 
size in bytes. (This is because it takes `void*` pointers as 
inputs, and so does not know the element type or its size.)

Also, I think you need to manually zero-terminate `s`. You 
allocate space to do so, but don't actually use it. (I believe 
that transcode will only zero-terminate the destination if the 
source argument is already zero-terminated.)

    r.output[i] = cast(wchar*)s;
}