Hi, I'm new to comtypes (and com in general) I'm trying to convert some code to Python from: https://github.com/DanStevens/AudioEndPointController/blob/master/EndPointController/EndPointController.cpp The code is for enumeration and getting information about audio devices in Windows Vista+.
I found partial example code that gives me most of what I needed here: http://stackoverflow.com/questions/32149809/read-and-or-change-windows-8-master-volume-in-python I was able to add some missing stuff. But I'm stuck figuring out how to add "OpenPropertyStore": https://msdn.microsoft.com/en-us/library/windows/desktop/dd371412%28v=vs.85%29.aspx It's used to get the "Friendly" name of the audio device. In the comtypes documentation there is a command GetModule(), that's supposed to get the definition about com objects. But I can't figure out how to use it with the methods I need to use? My current code at the end of the message. Also this code I need to convert it's used to set the default audio device: > HRESULT SetDefaultAudioPlaybackDevice(LPCWSTR devID) > { > IPolicyConfigVista *pPolicyConfig; > ERole reserved = eConsole; > HRESULT hr = CoCreateInstance(__uuidof(CPolicyConfigVistaClient), > NULL, CLSCTX_ALL, __uuidof(IPolicyConfigVista), (LPVOID > *)&pPolicyConfig); > if (SUCCEEDED(hr)) > { > hr = pPolicyConfig->SetDefaultEndpoint(devID, reserved); > pPolicyConfig->Release(); > } > return hr; > } I converted it to the below it seems to work but it don't actully change the audio device but I get no exception/errors. > pPolicyConfig = comtypes.CoCreateInstance( > CLSID_CPolicyConfigVistaClient, > IPolicyConfigVista, > comtypes.CLSCTX_ALL) > > pPolicyConfig.SetDefaultEndpoint('{0.0.0.00000000}.{1797e540-0196-47fd-9a36-9e34916bfc5f}', > 0) Any ide whats wrong? Thanks in advance. My current code: import ctypes import comtypes from ctypes import ( POINTER as _POINTER, HRESULT as _HRESULT, c_float as _c_float, ) from ctypes.wintypes import ( BOOL as _BOOL, DWORD as _DWORD, UINT as _UINT, LPWSTR as _LPWSTR, c_wchar_p as _PCWSTR, ) from comtypes import ( GUID as _GUID, COMMETHOD as _COMMETHOD, STDMETHOD as _STDMETHOD, ) MMDeviceApiLib = _GUID( '{2FDAAFA3-7523-4F66-9957-9D5E7FE698F6}') IID_IPropertyStore = _GUID( '{886d8eeb-8cf2-4446-8d02-cdba1dbdcf99}') IID_IAudioEndpointVolume = _GUID( '{5CDF2C82-841E-4546-9722-0CF74078229A}') IID_IMMDevice = _GUID( '{D666063F-1587-4E43-81F1-B948E807363F}') IID_IMMDeviceCollection = _GUID( '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}') IID_IMMDeviceEnumerator = _GUID( '{A95664D2-9614-4F35-A746-DE8DB63617E6}') CLSID_MMDeviceEnumerator = _GUID( '{BCDE0395-E52F-467C-8E3D-C4579291692E}') IID_IPolicyConfigVista = _GUID( '{568b9108-44bf-40b4-9006-86afe5b5a620}') CLSID_CPolicyConfigVistaClient = _GUID( '{294935CE-F637-4E7C-A41B-AB255460B862}') STGM_READ = 0x00000000 STGM_WRITE = 0x00000001 STGM_READWRITE = 0x00000002 class IMMDevice(comtypes.IUnknown): _iid_ = IID_IMMDevice _methods_ = ( _STDMETHOD(_HRESULT, 'Activate', []), _STDMETHOD(_HRESULT, 'OpenPropertyStore', []), _COMMETHOD([], _HRESULT, 'GetId', (['out','retval'], _POINTER(_LPWSTR), 'ppstrId')), _STDMETHOD(_HRESULT, 'GetState', [])) #_COMMETHOD([], _HRESULT, # 'OpenPropertyStore', # (['in'], _DWORD, 'stgmAccess'), # (['out','retval'], # _POINTER(_POINTER(IPropertyStore)), 'ppProperties')), class IMMDeviceCollection(comtypes.IUnknown): _iid_ = IID_IMMDeviceCollection _methods_ = ( _COMMETHOD([], _HRESULT, 'GetCount', (['out','retval'], _POINTER(_UINT), 'pcDevices')), _COMMETHOD([], _HRESULT, 'Item', (['in'], _UINT, 'nDevice'), (['out','retval'], _POINTER(_POINTER(IMMDevice)), 'ppDevice')), ) class IMMDeviceEnumerator(comtypes.IUnknown): _iid_ = IID_IMMDeviceEnumerator _methods_ = ( _COMMETHOD([], _HRESULT, 'EnumAudioEndpoints', (['in'], _DWORD, 'dataFlow'), (['in'], _DWORD, 'dwStateMask'), (['out','retval'], _POINTER(_POINTER(IMMDeviceCollection)), 'ppDevices')), _COMMETHOD([], _HRESULT, 'GetDefaultAudioEndpoint', (['in'], _DWORD, 'dataFlow'), (['in'], _DWORD, 'role'), (['out','retval'], _POINTER(_POINTER(IMMDevice)), 'ppDevices')) ) class IPolicyConfigVista(comtypes.IUnknown): _iid_ = IID_IPolicyConfigVista _methods_ = ( _COMMETHOD([], _HRESULT, 'SetDefaultEndpoint', (['in'], _PCWSTR, 'wszDeviceId'), (['in'], _DWORD, 'eRole')), ) if __name__ == '__main__': DEVICE_STATE_ACTIVE = 0x00000001 enumerator = comtypes.CoCreateInstance( CLSID_MMDeviceEnumerator, IMMDeviceEnumerator, comtypes.CLSCTX_INPROC_SERVER) pDevices = enumerator.EnumAudioEndpoints(0, DEVICE_STATE_ACTIVE) print pDevices.GetCount() pDefaultDevice = enumerator.GetDefaultAudioEndpoint(0, 1) print pDefaultDevice.GetId() for i in range(pDevices.GetCount()): pCurrentDevice = pDevices.Item(i) print pCurrentDevice.GetId() pPolicyConfig = comtypes.CoCreateInstance( CLSID_CPolicyConfigVistaClient, IPolicyConfigVista, comtypes.CLSCTX_ALL) pPolicyConfig.SetDefaultEndpoint('{0.0.0.00000000}.{1797e540-0196-47fd-9a36-9e34916bfc5f}', 0) ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. 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