控制音量，可以说下思路 也可以给出代码 谢谢

[love200510]

可以说下思路 也可以给出代码

[mndsoft]

http://www.mndsoft.com
输入 “音量”搜索

[love200510]

我公司的机子不太好
速度慢的没法说了
我开始就去了 你的网站
可是没法 下载 网速慢

[michael_zy]

这个不难，网上有现成的代码和例子的~~~~

[VBDN]

把下边的代码放到一个类文件中，类起名clsVolume。
Option Explicit

Private hmem As Long

Const 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 Type

Private Type MIXERCONTROLDETAILS_UNSIGNED
dwValue As Long
End Type

Private 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 Type

Private Type MIXERLINECONTROLS
cbStruct As Long
dwLineID As Long
dwControl As Long
cControls As Long
cbmxctrl As Long
pamxctrl As Long
End Type

Private 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 Long

Private 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

[VBDN]

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 Long

mxl.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 Function

Private 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_UNSIGNED

With 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 Function

Public 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 Function

Public Property Get prMixerErr() As Long
prMixerErr = mvarprMixerErr
End Property

Public Property Get prSpeakerMinVolume() As Long
prSpeakerMinVolume = mvarprSpeakerMinVolume
End Property

Public Property Get prSpeakerMaxVolume() As Long
prSpeakerMaxVolume = mvarprSpeakerMaxVolume
End Property

Public Property Let prSpeakerVolume(ByVal vData As Long)
mvarprSpeakerVolume = vData
Call fSetVolumeControl(hmixer, volCtrl, vData)
End Property

Public Property Get prSpeakerVolume() As Long
prSpeakerVolume = mvarprSpeakerVolume
End Property

Public Property Get prMicMinVolume() As Long
prMicMinVolume = mvarprMicMinVolume
End Property

Public Property Get prMicMaxVolume() As Long
prMicMaxVolume = mvarprMicMaxVolume
End Property

Public Property Let prMicVolume(ByVal vData As Long)
mvarprMicVolume = vData
Call fSetVolumeControl(hmixer, micCtrl, vData)
End Property

Public Property Get prMicVolume() As Long
prMicVolume = mvarprMicVolume
End Property

=============================
使用举例：
Dim MyVolume As New clsVolume
MyVolume.prMicVolume = lVol