获取默认的音频设备属性getDefaultDevice

使用COREAPI获取默认音频属性

wstring DeviceAPOInfo::getDefaultDevice(bool input, int role)
{
    wstring result;

    IMMDeviceEnumerator* enumerator = NULL;
    HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator), (void**)&enumerator);
    if (SUCCEEDED(hr))
    {
        IMMDevice* endPoint = NULL;
        hr = enumerator->GetDefaultAudioEndpoint(input ? eCapture : eRender, (ERole)role, &endPoint);
        if (SUCCEEDED(hr))
        {
            IPropertyStore* propertyStore = NULL;
            hr = endPoint->OpenPropertyStore(STGM_READ, &propertyStore);
            if (SUCCEEDED(hr))
            {
                PROPVARIANT variant;
                PropVariantInit(&variant);
                hr = propertyStore->GetValue(guidPropertyKey, &variant);
                if (SUCCEEDED(hr))
                {
                    result = variant.pwszVal;
                    PropVariantClear(&variant);
                }
                propertyStore->Release();
            }
            endPoint->Release();
        }
        enumerator->Release();
    }

    return result;
}