ADVAPI32: Implement GetServiceDisplayNameW

[Alexandre Julliard]

"Rolf Kalbermatter" <r.kalbermatter at hccnet.nl> writes:

> +    size = *lpcchBuffer * sizeof(WCHAR);
> +    ret = RegGetValueW(hscm->hkey, lpServiceName, szDisplayName, RRF_RT_REG_SZ, &type, NULL, &size);
> +    switch (ret)
> +    {
> +        case ERROR_SUCCESS:
> +            ret = RegGetValueW(hscm->hkey, lpServiceName, szDisplayName, RRF_RT_REG_SZ, &type, lpDisplayName, &size);
> +            *lpcchBuffer = (size / sizeof(WCHAR)) - 1;
> +            break;

It would be better to put the data into the buffer right away, so that
you don't need two registry queries in the common case of the buffer
being large enough.

-- 
Alexandre Julliard
julliard at winehq.org