I wrote a little ditty to set Win volume, which will also check for what you
want (attached)
On my system, just running it prints:
C:\projects\sound>PYTHON VOL.PY
cbStruct 24
dwControlID 1
cChannels 1
cMultipleItems 0
cbDetails 4
paDetails c_ulong(32639)
waveOutGetNumDevs= 1
mixerGetNumDevs 1
res: 0
wMid= 131133
wPid= 821793
vDriverVersion= 1852729687
szPname= ov Videum Wave Playback 4Ä ¤
dwFormats= 2162690
wChannels= 4
res 0
l: 0 r: 0
Ray
At 04:51 PM 3/13/2006, Roger Upole wrote:
>Trent Mick wrote:
>> Does anybody know of a way to programmatically check if a particular
>> Windows box has a soundcard installed and configured?
>>
>> Background:
>> I'm running a Windows buildbot for Python and the test suite fails on
>> test_winsound.py because the box doesn't have a sound card setup. (The
>> "Sound" Control Panel items says there are "No Playback Devices" for
>> Sound Playback.)
>
>WMI can list sound devices.
>
>import win32com.client
>wmi=win32com.client.GetObject('winmgmts:')
>scs=wmi.InstancesOf('win32_sounddevice')
>for sc in scs:
> print sc.Properties_('Name'), sc.Properties_('Status')
>
>
>You might also have to check one of the other properties
>to make sure the device is actually operating, I don't
>have a non-functional device to test with.
>
> Roger
>
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>Python-win32 mailing list
>Python-win32@python.org
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#!/usr/bin/env python
#Boa:PyApp:main
modules = {}
import ctypes
mixerSetControlDetails = (
ctypes.windll.winmm.mixerSetControlDetails)
mixerGetControlDetails = (
ctypes.windll.winmm.mixerGetControlDetailsA)
# Some constants
MIXER_OBJECTF_MIXER = 0 # mmsystem.h
VOLUME_CONTROL_ID = 0 # Same on all machines?
SPEAKER_LINE_FADER_ID = 1 # "Identifier <identifier> in OID value does not
resolve to a positive integer"
MINIMUM_VOLUME = 0 # fader control (MSDN Library)
MAXIMUM_VOLUME = 65535 # fader control (MSDN Library)
class MIXERCONTROLDETAILS(ctypes.Structure):
_pack_ = 1
_fields_ = [('cbStruct', ctypes.c_ulong),
('dwControlID', ctypes.c_ulong),
('cChannels', ctypes.c_ulong),
('cMultipleItems', ctypes.c_ulong),
('cbDetails', ctypes.c_ulong),
('paDetails', ctypes.POINTER(ctypes.c_ulong))]
def setVolume(volume):
"""Set the speaker volume on the 'Volume Control' mixer"""
if not (MINIMUM_VOLUME <= volume <= MAXIMUM_VOLUME):
raise ValueError, "Volume out of range"
cd = MIXERCONTROLDETAILS(ctypes.sizeof(MIXERCONTROLDETAILS),
SPEAKER_LINE_FADER_ID,
1, 0,
ctypes.sizeof(ctypes.c_ulong),
ctypes.pointer(ctypes.c_ulong(volume)))
ret = mixerSetControlDetails(VOLUME_CONTROL_ID,
ctypes.byref(cd),
MIXER_OBJECTF_MIXER)
if ret != 0:
print WindowsError, "Error %d while setting volume" % ret
ret = mixerGetControlDetails(VOLUME_CONTROL_ID,
ctypes.byref(cd),
MIXER_OBJECTF_MIXER)
if ret != 0:
print WindowsError, "Error %d while setting volume" % ret
else:
print 'cbStruct', cd.cbStruct
print 'dwControlID', cd.dwControlID
print 'cChannels', cd.cChannels
print 'cMultipleItems', cd.cMultipleItems
print 'cbDetails', cd.cbDetails
print 'paDetails', cd.paDetails.contents
return
setVolume((2**16-1)/2)
from ctypes import *
from struct import *
winmm= windll.winmm
print
print 'waveOutGetNumDevs=',winmm.waveOutGetNumDevs()
print 'mixerGetNumDevs', winmm.mixerGetNumDevs()
wvcps= ' '*52
print 'res:', winmm.waveOutGetDevCapsA(0,wvcps,len(wvcps))
res = unpack('IIL32cLI', wvcps)
wMid=res[0]
wPid=res[1]
vDriverVersion=res[2]
szPname=''.join(res[3:35])
dwFormats=res[35]
wChannels=res[36]
print 'wMid=',wMid
print 'wPid=',wPid
print 'vDriverVersion=',vDriverVersion
print 'szPname=',szPname
print 'dwFormats=',dwFormats
print 'wChannels=',wChannels
vol=c_ulong()
print 'res', winmm.waveOutGetVolume(0, byref(vol))
print 'l:', vol.value & 0xffff, 'r:',vol.value >> 16 # left, right
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