Re: [PATCH 1/2] mmdevapi: allow GetPropValue function in audio drivers

[Nikolay Sivov]

On 18.11.2014 20:59, Mark Harmstone wrote:
> - if (SUCCEEDED(hr))
> - {
> -
>    MMDevice_SetPropValue(id, flow, prop, &pv);
> -
> -
>    if (pv.vt == VT_LPWSTR)
> -
>        HeapFree(GetProcessHeap(), 0, pv.u.pwszVal);
> - }
> -
>            out->vt = VT_LPWSTR;
> -
>            out->u.pwszVal = HeapAlloc(GetProcessHeap(), 0, 256 * sizeof(WCHAR));

This is a wrong way dealing with PROPVARIANT, you need to use 
PropVariantClear() and InitPropVariantFromString() - PROPVARIANT implies 
CoTaskMemAlloc/CoTaskMemFree memory management.