# System::initialize failed in DSOUND output type **URL:** \ **Category:** FMOD Studio\ **Created:** [November 6, 2013, 8:02am UTC](https://qa.fmod.com/t/system-initialize-failed-in-dsound-output-type/11208 "2013-11-06T08:02:07Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![gdkid1412](https://avatars.discourse-cdn.com/v4/letter/g/898d66/32.png) [@gdkid1412](https://qa.fmod.com/u/gdkid1412)\ **Post date:** [November 6, 2013, 8:02am UTC](https://qa.fmod.com/t/system-initialize-failed-in-dsound-output-type/11208/1 "2013-11-06T08:02:07Z")
When FMOD\_OUTPUTTYPE is FMOD\_OUTPUTTYPE\_DSOUND and the value of extradriverdata is 0 System::initialize returns FMOD\_OK. But if I pass the address of CWnd::m\_hWnd to extradriverdata(my app based on a MFC application),the return value of System::initialize is FMOD\_ERR\_OUTPUT\_DRIVER\_CALL. How to solve this? ---
**Author:** ![gdkid1412](https://avatars.discourse-cdn.com/v4/letter/g/898d66/32.png) [@gdkid1412](https://qa.fmod.com/u/gdkid1412)\ **Post date:** [November 6, 2013, 8:11am UTC](https://qa.fmod.com/t/system-initialize-failed-in-dsound-output-type/11208/2 "2013-11-06T08:11:37Z")
The reason why I want to pass &m\_hWnd to extradriverdata is the sound still playing after I minimize the window (I called SetMute when minimize is triggered). And it stuttered for a while after I close the window. There problem didn’t happen in other output type such as WASAPI. So I guess it could be solved if I pass the &m\_hWnd to extradrivardata. But failed. ---
**Author:** ![gdkid1412](https://avatars.discourse-cdn.com/v4/letter/g/898d66/32.png) [@gdkid1412](https://qa.fmod.com/u/gdkid1412)\ **Post date:** [November 7, 2013, 1:09am UTC](https://qa.fmod.com/t/system-initialize-failed-in-dsound-output-type/11208/3 "2013-11-07T01:09:35Z")
When creating a IDirectSound we need to call SetCooperativeLevel method which need a HWND parameter. So how can it initialize successful if extradriverdata is set to 0,but failed with &m\_hWnd? Thanks in advance if someone can explain about this to we.I’m a little puzzled. ---
**Author:** ![brett](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/brett/32/261_2.png) [@brett](https://qa.fmod.com/u/brett)\ **Post date:** [November 12, 2013, 3:40am UTC](https://qa.fmod.com/t/system-initialize-failed-in-dsound-output-type/11208/4 "2013-11-12T03:40:15Z")
I think the issue is that you are using &m\_hwnd instead of just passing the m\_hwnd directly. The documentation does say pointer to, so i’ll update that to say cast to instead, apologies for the hassle.