如果您只要控制wav播放设备的音量,可以调用API函数waveOutSetVolume。 其第二第三个参数设为&HFFFF时音量最大,设为&H0000时最小即静音。 您可以参考以下链接的样例程序: Q118377 How to Control the Volume of Sound Files from Visual Basic http://support.microsoft.com/support/kb/articles/q118/3/77.asp如果您需要控制系统混音设备的功能,您可以调用API函数mixerSetControlDetails来实现,设置代表音量大小的变量值为&H0000,也能达到静音的效果。 相关函数还有: mixerClose - 关闭指定的混音设备 mixerOpen – 打开指定的混音设备 mixerGetDevCaps – 查询指定混音设备的声音大小范围 mixerGetID – 检索与指定设备句柄相关的混音器的设备ID mixerSetControlDetails – 设置单一音频线的属性 mixerGetControlDetails – 检索单一音频线的详细信息您可以参考以下链接的样例程序: Q178456 SAMPLE: Volume.exe: Set Volume Control Levels Using Visual Basic http://support.microsoft.com/support/kb/articles/q178/4/56.asp mixerSetControlDetails http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcesdkr/htm/_wcesdk_am_mixersetcontroldetails.asp
哈哈,MSDN的内容是能满足各方面需求的,包括抄书。
加个类模块 Option ExplicitPrivate hmem As LongConst MMSYSERR_NOERROR = 0 Const MAXPNAMELEN = 32 Const MIXER_LONG_NAME_CHARS = 64 Const MIXER_SHORT_NAME_CHARS = 16 Const MIXER_GETLINEINFOF_COMPONENTTYPE = &H3& Const MIXER_GETCONTROLDETAILSF_VALUE = &H0& Const MIXER_SETCONTROLDETAILSF_VALUE = &H0& Const MIXER_GETLINECONTROLSF_ONEBYTYPE = &H2& Const MIXERLINE_COMPONENTTYPE_DST_FIRST = &H0& Const MIXERLINE_COMPONENTTYPE_SRC_FIRST = &H1000& Const MIXERLINE_COMPONENTTYPE_DST_SPEAKERS = _ (MIXERLINE_COMPONENTTYPE_DST_FIRST + 4) Const MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE = _ (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 3) Const MIXERLINE_COMPONENTTYPE_SRC_LINE = _ (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 2) Const MIXERCONTROL_CT_CLASS_FADER = &H50000000 Const MIXERCONTROL_CT_UNITS_UNSIGNED = &H30000 Const MIXERCONTROL_CONTROLTYPE_FADER = _ (MIXERCONTROL_CT_CLASS_FADER Or _ MIXERCONTROL_CT_UNITS_UNSIGNED) Const MIXERCONTROL_CONTROLTYPE_VOLUME = _ (MIXERCONTROL_CONTROLTYPE_FADER + 1)Private Type MIXERCONTROLDETAILS cbStruct As Long dwControlID As Long cChannels As Long item As Long cbDetails As Long paDetails As Long End TypePrivate Type MIXERCONTROLDETAILS_UNSIGNED dwValue As Long End TypePrivate Type MIXERCONTROL cbStruct As Long dwControlID As Long dwControlType As Long fdwControl As Long cMultipleItems As Long szShortName As String * MIXER_SHORT_NAME_CHARS szName As String * MIXER_LONG_NAME_CHARS lMinimum As Long lMaximum As Long reserved(10) As Long End TypePrivate Type MIXERLINECONTROLS cbStruct As Long dwLineID As Long dwControl As Long cControls As Long cbmxctrl As Long pamxctrl As Long End TypePrivate Type MIXERLINE cbStruct As Long dwDestination As Long dwSource As Long dwLineID As Long fdwLine As Long dwUser As Long dwComponentType As Long cChannels As Long cConnections As Long cControls As Long szShortName As String * MIXER_SHORT_NAME_CHARS szName As String * MIXER_LONG_NAME_CHARS dwType As Long dwDeviceID As Long wMid As Integer wPid As Integer vDriverVersion As Long szPname As String * MAXPNAMELEN End Type ' 'Allocates the specified number of bytes from the heap. Private Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, _ ByVal dwBytes As Long) As Long ' 'Locks a global memory object and returns a pointer to the ' first byte of the object's memory block. The memory block ' associated with a locked object cannot be moved or discarded. Private Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long ' 'Frees the specified global memory object and invalidates its handle. Private Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long ' Private Declare Sub CopyPtrFromStruct Lib "kernel32" Alias "RtlMoveMemory" _ (ByVal ptr As Long, struct As Any, ByVal cb As Long)Private Declare Sub CopyStructFromPtr Lib "kernel32" Alias "RtlMoveMemory" _ (struct As Any, ByVal ptr As Long, ByVal cb As Long) ' 'Opens a specified mixer device and ensures that the device ' will not be removed until the application closes the handle. Private Declare Function mixerOpen Lib "winmm.dll" _ (phmx As Long, ByVal uMxId As Long, ByVal dwCallback As Long, _ ByVal dwInstance As Long, ByVal fdwOpen As Long) As Long ' 'Sets properties of a single control associated with an audio line. Private Declare Function mixerSetControlDetails Lib "winmm.dll" _ (ByVal hmxobj As Long, pmxcd As MIXERCONTROLDETAILS, _ ByVal fdwDetails As Long) As Long ' 'Retrieves information about a specific line of a mixer device. Private Declare Function mixerGetLineInfo Lib "winmm.dll" _ Alias "mixerGetLineInfoA" (ByVal hmxobj As Long, _ pmxl As MIXERLINE, ByVal fdwInfo As Long) As Long ' 'Retrieves one or more controls associated with an audio line. Private Declare Function mixerGetLineControls Lib "winmm.dll" _ Alias "mixerGetLineControlsA" (ByVal hmxobj As Long, _ pmxlc As MIXERLINECONTROLS, ByVal fdwControls As Long) As LongPrivate hmixer As Long Private volCtrl As MIXERCONTROL ' Waveout volume control. Private micCtrl As MIXERCONTROL ' Microphone volume control. ' 'Local variable to save properties Private mvarprMicVolume As Long 'Local copy Private mvarprMicMaxVolume As Long 'Local copy Private mvarprMicMinVolume As Long 'Local copy Private mvarprSpeakerVolume As Long 'Local copy Private mvarprSpeakerMaxVolume As Long 'Local copy Private mvarprSpeakerMinVolume As Long 'Local copy Private mvarprMixerErr As Long 'Local copy
Private Function fGetVolumeControl(ByVal hmixer As Long, _ ByVal componentType As Long, ByVal ctrlType As Long, _ ByRef mxc As MIXERCONTROL) As Boolean ' ' This function attempts to obtain a mixer control. ' Dim mxlc As MIXERLINECONTROLS Dim mxl As MIXERLINE Dim hmem As Long Dim rc As Longmxl.cbStruct = Len(mxl) mxl.dwComponentType = componentType ' ' Get a line corresponding to the component type. ' rc = mixerGetLineInfo(hmixer, mxl, MIXER_GETLINEINFOF_COMPONENTTYPE) If MMSYSERR_NOERROR = rc Then With mxlc .cbStruct = Len(mxlc) .dwLineID = mxl.dwLineID .dwControl = ctrlType .cControls = 1 .cbmxctrl = Len(mxc) End With ' ' Allocate a buffer for the control. ' hmem = GlobalAlloc(&H40, Len(mxc)) mxlc.pamxctrl = GlobalLock(hmem) mxc.cbStruct = Len(mxc) ' ' Get the control. ' rc = mixerGetLineControls(hmixer, mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE) If MMSYSERR_NOERROR = rc Then fGetVolumeControl = True ' ' Copy the control into the destination structure. ' Call CopyStructFromPtr(mxc, mxlc.pamxctrl, Len(mxc)) Else fGetVolumeControl = False End If Call GlobalFree(hmem) Exit Function End If fGetVolumeControl = False End FunctionPrivate Function fSetVolumeControl(ByVal hmixer As Long, _ mxc As MIXERCONTROL, ByVal volume As Long) As Boolean ' ' This function sets the value for a volume control. ' Dim rc As Long Dim mxcd As MIXERCONTROLDETAILS Dim vol As MIXERCONTROLDETAILS_UNSIGNEDWith mxcd .item = 0 .dwControlID = mxc.dwControlID .cbStruct = Len(mxcd) .cbDetails = Len(vol) End With ' ' Allocate a buffer for the control value buffer. ' hmem = GlobalAlloc(&H40, Len(vol)) mxcd.paDetails = GlobalLock(hmem) mxcd.cChannels = 1 vol.dwValue = volume ' ' Copy the data into the control value buffer. ' Call CopyPtrFromStruct(mxcd.paDetails, vol, Len(vol)) ' ' Set the control value. ' rc = mixerSetControlDetails(hmixer, mxcd, MIXER_SETCONTROLDETAILSF_VALUE) Call GlobalFree(hmem)If MMSYSERR_NOERROR = rc Then fSetVolumeControl = True Else fSetVolumeControl = False End If End FunctionPublic Function meOpenMixer() As Long Dim rc As Long Dim bOK As Boolean ' ' Open the mixer with deviceID 0. ' rc = mixerOpen(hmixer, 0, 0, 0, 0) mvarprMixerErr = rc If MMSYSERR_NOERROR <> rc Then MsgBox "Could not open the mixer.", vbCritical, "Volume Control" Exit Function End If ' ' Get the waveout volume control. ' bOK = fGetVolumeControl(hmixer, _ MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, _ MIXERCONTROL_CONTROLTYPE_VOLUME, volCtrl) ' ' If the function successfully gets the volume control, ' the maximum and minimum values are specified by ' lMaximum and lMinimum. ' If bOK Then mvarprSpeakerMaxVolume = volCtrl.lMaximum mvarprSpeakerMinVolume = volCtrl.lMinimum End If ' ' Get the microphone volume control. ' bOK = fGetVolumeControl(hmixer, _ MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE, _ MIXERCONTROL_CONTROLTYPE_VOLUME, micCtrl)If bOK Then mvarprMicMaxVolume = micCtrl.lMaximum mvarprMicMinVolume = micCtrl.lMinimum End If End FunctionPublic Property Get prMixerErr() As Long prMixerErr = mvarprMixerErr End PropertyPublic Property Get prSpeakerMinVolume() As Long prSpeakerMinVolume = mvarprSpeakerMinVolume End PropertyPublic Property Get prSpeakerMaxVolume() As Long prSpeakerMaxVolume = mvarprSpeakerMaxVolume End PropertyPublic Property Let prSpeakerVolume(ByVal vData As Long) mvarprSpeakerVolume = vData Call fSetVolumeControl(hmixer, volCtrl, vData) End PropertyPublic Property Get prSpeakerVolume() As Long prSpeakerVolume = mvarprSpeakerVolume End PropertyPublic Property Get prMicMinVolume() As Long prMicMinVolume = mvarprMicMinVolume End PropertyPublic Property Get prMicMaxVolume() As Long prMicMaxVolume = mvarprMicMaxVolume End PropertyPublic Property Let prMicVolume(ByVal vData As Long) mvarprMicVolume = vData Call fSetVolumeControl(hmixer, micCtrl, vData) End PropertyPublic Property Get prMicVolume() As Long prMicVolume = mvarprMicVolume End Property
其第二第三个参数设为&HFFFF时音量最大,设为&H0000时最小即静音。
您可以参考以下链接的样例程序:
Q118377 How to Control the Volume of Sound Files from Visual Basic
http://support.microsoft.com/support/kb/articles/q118/3/77.asp如果您需要控制系统混音设备的功能,您可以调用API函数mixerSetControlDetails来实现,设置代表音量大小的变量值为&H0000,也能达到静音的效果。
相关函数还有:
mixerClose - 关闭指定的混音设备
mixerOpen – 打开指定的混音设备
mixerGetDevCaps – 查询指定混音设备的声音大小范围
mixerGetID – 检索与指定设备句柄相关的混音器的设备ID
mixerSetControlDetails – 设置单一音频线的属性
mixerGetControlDetails – 检索单一音频线的详细信息您可以参考以下链接的样例程序:
Q178456 SAMPLE: Volume.exe: Set Volume Control Levels Using Visual Basic
http://support.microsoft.com/support/kb/articles/q178/4/56.asp
mixerSetControlDetails
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcesdkr/htm/_wcesdk_am_mixersetcontroldetails.asp
Option ExplicitPrivate hmem As LongConst MMSYSERR_NOERROR = 0
Const MAXPNAMELEN = 32
Const MIXER_LONG_NAME_CHARS = 64
Const MIXER_SHORT_NAME_CHARS = 16
Const MIXER_GETLINEINFOF_COMPONENTTYPE = &H3&
Const MIXER_GETCONTROLDETAILSF_VALUE = &H0&
Const MIXER_SETCONTROLDETAILSF_VALUE = &H0&
Const MIXER_GETLINECONTROLSF_ONEBYTYPE = &H2&
Const MIXERLINE_COMPONENTTYPE_DST_FIRST = &H0&
Const MIXERLINE_COMPONENTTYPE_SRC_FIRST = &H1000&
Const MIXERLINE_COMPONENTTYPE_DST_SPEAKERS = _
(MIXERLINE_COMPONENTTYPE_DST_FIRST + 4)
Const MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE = _
(MIXERLINE_COMPONENTTYPE_SRC_FIRST + 3)
Const MIXERLINE_COMPONENTTYPE_SRC_LINE = _
(MIXERLINE_COMPONENTTYPE_SRC_FIRST + 2)
Const MIXERCONTROL_CT_CLASS_FADER = &H50000000
Const MIXERCONTROL_CT_UNITS_UNSIGNED = &H30000
Const MIXERCONTROL_CONTROLTYPE_FADER = _
(MIXERCONTROL_CT_CLASS_FADER Or _
MIXERCONTROL_CT_UNITS_UNSIGNED)
Const MIXERCONTROL_CONTROLTYPE_VOLUME = _
(MIXERCONTROL_CONTROLTYPE_FADER + 1)Private Type MIXERCONTROLDETAILS
cbStruct As Long
dwControlID As Long
cChannels As Long
item As Long
cbDetails As Long
paDetails As Long
End TypePrivate Type MIXERCONTROLDETAILS_UNSIGNED
dwValue As Long
End TypePrivate Type MIXERCONTROL
cbStruct As Long
dwControlID As Long
dwControlType As Long
fdwControl As Long
cMultipleItems As Long
szShortName As String * MIXER_SHORT_NAME_CHARS
szName As String * MIXER_LONG_NAME_CHARS
lMinimum As Long
lMaximum As Long
reserved(10) As Long
End TypePrivate Type MIXERLINECONTROLS
cbStruct As Long
dwLineID As Long
dwControl As Long
cControls As Long
cbmxctrl As Long
pamxctrl As Long
End TypePrivate Type MIXERLINE
cbStruct As Long
dwDestination As Long
dwSource As Long
dwLineID As Long
fdwLine As Long
dwUser As Long
dwComponentType As Long
cChannels As Long
cConnections As Long
cControls As Long
szShortName As String * MIXER_SHORT_NAME_CHARS
szName As String * MIXER_LONG_NAME_CHARS
dwType As Long
dwDeviceID As Long
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * MAXPNAMELEN
End Type
'
'Allocates the specified number of bytes from the heap.
Private Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, _
ByVal dwBytes As Long) As Long
'
'Locks a global memory object and returns a pointer to the
' first byte of the object's memory block. The memory block
' associated with a locked object cannot be moved or discarded.
Private Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long
'
'Frees the specified global memory object and invalidates its handle.
Private Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long
'
Private Declare Sub CopyPtrFromStruct Lib "kernel32" Alias "RtlMoveMemory" _
(ByVal ptr As Long, struct As Any, ByVal cb As Long)Private Declare Sub CopyStructFromPtr Lib "kernel32" Alias "RtlMoveMemory" _
(struct As Any, ByVal ptr As Long, ByVal cb As Long)
'
'Opens a specified mixer device and ensures that the device
' will not be removed until the application closes the handle.
Private Declare Function mixerOpen Lib "winmm.dll" _
(phmx As Long, ByVal uMxId As Long, ByVal dwCallback As Long, _
ByVal dwInstance As Long, ByVal fdwOpen As Long) As Long
'
'Sets properties of a single control associated with an audio line.
Private Declare Function mixerSetControlDetails Lib "winmm.dll" _
(ByVal hmxobj As Long, pmxcd As MIXERCONTROLDETAILS, _
ByVal fdwDetails As Long) As Long
'
'Retrieves information about a specific line of a mixer device.
Private Declare Function mixerGetLineInfo Lib "winmm.dll" _
Alias "mixerGetLineInfoA" (ByVal hmxobj As Long, _
pmxl As MIXERLINE, ByVal fdwInfo As Long) As Long
'
'Retrieves one or more controls associated with an audio line.
Private Declare Function mixerGetLineControls Lib "winmm.dll" _
Alias "mixerGetLineControlsA" (ByVal hmxobj As Long, _
pmxlc As MIXERLINECONTROLS, ByVal fdwControls As Long) As LongPrivate hmixer As Long
Private volCtrl As MIXERCONTROL ' Waveout volume control.
Private micCtrl As MIXERCONTROL ' Microphone volume control.
'
'Local variable to save properties
Private mvarprMicVolume As Long 'Local copy
Private mvarprMicMaxVolume As Long 'Local copy
Private mvarprMicMinVolume As Long 'Local copy
Private mvarprSpeakerVolume As Long 'Local copy
Private mvarprSpeakerMaxVolume As Long 'Local copy
Private mvarprSpeakerMinVolume As Long 'Local copy
Private mvarprMixerErr As Long 'Local copy
ByVal componentType As Long, ByVal ctrlType As Long, _
ByRef mxc As MIXERCONTROL) As Boolean
'
' This function attempts to obtain a mixer control.
'
Dim mxlc As MIXERLINECONTROLS
Dim mxl As MIXERLINE
Dim hmem As Long
Dim rc As Longmxl.cbStruct = Len(mxl)
mxl.dwComponentType = componentType
'
' Get a line corresponding to the component type.
'
rc = mixerGetLineInfo(hmixer, mxl, MIXER_GETLINEINFOF_COMPONENTTYPE)
If MMSYSERR_NOERROR = rc Then
With mxlc
.cbStruct = Len(mxlc)
.dwLineID = mxl.dwLineID
.dwControl = ctrlType
.cControls = 1
.cbmxctrl = Len(mxc)
End With
'
' Allocate a buffer for the control.
'
hmem = GlobalAlloc(&H40, Len(mxc))
mxlc.pamxctrl = GlobalLock(hmem)
mxc.cbStruct = Len(mxc)
'
' Get the control.
'
rc = mixerGetLineControls(hmixer, mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE)
If MMSYSERR_NOERROR = rc Then
fGetVolumeControl = True
'
' Copy the control into the destination structure.
'
Call CopyStructFromPtr(mxc, mxlc.pamxctrl, Len(mxc))
Else
fGetVolumeControl = False
End If
Call GlobalFree(hmem)
Exit Function
End If
fGetVolumeControl = False
End FunctionPrivate Function fSetVolumeControl(ByVal hmixer As Long, _
mxc As MIXERCONTROL, ByVal volume As Long) As Boolean
'
' This function sets the value for a volume control.
'
Dim rc As Long
Dim mxcd As MIXERCONTROLDETAILS
Dim vol As MIXERCONTROLDETAILS_UNSIGNEDWith mxcd
.item = 0
.dwControlID = mxc.dwControlID
.cbStruct = Len(mxcd)
.cbDetails = Len(vol)
End With
'
' Allocate a buffer for the control value buffer.
'
hmem = GlobalAlloc(&H40, Len(vol))
mxcd.paDetails = GlobalLock(hmem)
mxcd.cChannels = 1
vol.dwValue = volume
'
' Copy the data into the control value buffer.
'
Call CopyPtrFromStruct(mxcd.paDetails, vol, Len(vol))
'
' Set the control value.
'
rc = mixerSetControlDetails(hmixer, mxcd, MIXER_SETCONTROLDETAILSF_VALUE)
Call GlobalFree(hmem)If MMSYSERR_NOERROR = rc Then
fSetVolumeControl = True
Else
fSetVolumeControl = False
End If
End FunctionPublic Function meOpenMixer() As Long
Dim rc As Long
Dim bOK As Boolean
'
' Open the mixer with deviceID 0.
'
rc = mixerOpen(hmixer, 0, 0, 0, 0)
mvarprMixerErr = rc
If MMSYSERR_NOERROR <> rc Then
MsgBox "Could not open the mixer.", vbCritical, "Volume Control"
Exit Function
End If
'
' Get the waveout volume control.
'
bOK = fGetVolumeControl(hmixer, _
MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, _
MIXERCONTROL_CONTROLTYPE_VOLUME, volCtrl)
'
' If the function successfully gets the volume control,
' the maximum and minimum values are specified by
' lMaximum and lMinimum.
'
If bOK Then
mvarprSpeakerMaxVolume = volCtrl.lMaximum
mvarprSpeakerMinVolume = volCtrl.lMinimum
End If
'
' Get the microphone volume control.
'
bOK = fGetVolumeControl(hmixer, _
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE, _
MIXERCONTROL_CONTROLTYPE_VOLUME, micCtrl)If bOK Then
mvarprMicMaxVolume = micCtrl.lMaximum
mvarprMicMinVolume = micCtrl.lMinimum
End If
End FunctionPublic Property Get prMixerErr() As Long
prMixerErr = mvarprMixerErr
End PropertyPublic Property Get prSpeakerMinVolume() As Long
prSpeakerMinVolume = mvarprSpeakerMinVolume
End PropertyPublic Property Get prSpeakerMaxVolume() As Long
prSpeakerMaxVolume = mvarprSpeakerMaxVolume
End PropertyPublic Property Let prSpeakerVolume(ByVal vData As Long)
mvarprSpeakerVolume = vData
Call fSetVolumeControl(hmixer, volCtrl, vData)
End PropertyPublic Property Get prSpeakerVolume() As Long
prSpeakerVolume = mvarprSpeakerVolume
End PropertyPublic Property Get prMicMinVolume() As Long
prMicMinVolume = mvarprMicMinVolume
End PropertyPublic Property Get prMicMaxVolume() As Long
prMicMaxVolume = mvarprMicMaxVolume
End PropertyPublic Property Let prMicVolume(ByVal vData As Long)
mvarprMicVolume = vData
Call fSetVolumeControl(hmixer, micCtrl, vData)
End PropertyPublic Property Get prMicVolume() As Long
prMicVolume = mvarprMicVolume
End Property