怎样在VB中添加一个按钮控制声音!!

ghosted 2003-05-19 06:07:10
我想在VB中添加一个"音量"的按钮,点击后可以显示系统栏的音量控制。我记得只要添加一句话调用就可以实现,请问一下具体是什么语句
谢谢!!!
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道素 2003-05-20
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Option Explicit

Const MMSYSERR_NOERROR = 0
Const SND_ASYNC = &H1
Const SND_NODEFAULT = &H2
Const SND_PURGE = &H40
Const SND_FILENAME = &H20000
Dim MyVolume As clsVolume
'
'Play a wave file.
Private Declare Function PlaySound Lib "winmm.dll" _
Alias "PlaySoundA" (ByVal lpszName As String, _
ByVal hModule As Long, ByVal dwFlags As Long) As Long

Private Sub Form_Load()

Set MyVolume = New clsVolume

MyVolume.meOpenMixer

If MyVolume.prMixerErr = MMSYSERR_NOERROR Then
With vsVolume
.Max = MyVolume.prSpeakerMinVolume
.Min = MyVolume.prSpeakerMaxVolume \ 2
.SmallChange = 1000
.LargeChange = 1000
End With
With vsMic
.Max = MyVolume.prMicMinVolume
.Min = MyVolume.prMicMaxVolume \ 2
.SmallChange = 1000
.LargeChange = 1000
.Enabled = True
End With
End If
End Sub

Private Sub Form_Unload(Cancel As Integer)
Set MyVolume = Nothing
Set frmVolume = Nothing
End Sub


Private Sub LblQuit_Click()
Unload Me
End Sub

Private Sub lblPlay_Click()
Dim l As Long
Dim lFlags As Long
Dim sSoundName As String
'
'Open a wavefile and initialize the form.
'
On Error GoTo lblPlayError
With CommonDialog1
.FileName = "*.wav"
.DefaultExt = "wav"
.Filter = "Wav (*.wav)"
.FilterIndex = 1
.Flags = cdlOFNPathMustExist Or cdlOFNFileMustExist
.DialogTitle = "Select a Wave File"
.CancelError = True
.ShowOpen
sSoundName = .FileName
End With

lFlags = SND_ASYNC Or SND_NODEFAULT Or SND_FILENAME
l = PlaySound(sSoundName, 0, lFlags)

lblPlayError:
End Sub

Private Sub lblStop_Click()
'dss
'Dim l As Long
'
'l = PlaySound("", 0, SND_PURGE)

Dim l As Long
Dim lFlags As Long

lFlags = SND_ASYNC Or SND_NODEFAULT Or SND_FILENAME
l = PlaySound("", 0, lFlags)
End Sub

Private Sub vsMic_Change()
Dim lVol As Long

lVol = CLng(vsMic.Value) * 2
MyVolume.prMicVolume = lVol
'Call fSetVolumeControl(hmixer, micCtrl, lVol)
End Sub
Private Sub vsMic_Scroll()
Dim lVol As Long

lVol = CLng(vsMic.Value) * 2
MyVolume.prMicVolume = lVol
'Call fSetVolumeControl(hmixer, micCtrl, lVol)
End Sub
Private Sub vsVolume_Change()
Dim lVol As Long

lVol = CLng(vsVolume.Value) * 2
MyVolume.prSpeakerVolume = lVol
'Call fSetVolumeControl(hmixer, volCtrl, lVol)
End Sub
Private Sub vsVolume_Scroll()
Dim lVol As Long

lVol = CLng(vsVolume.Value) * 2
MyVolume.prSpeakerVolume = lVol
'Call fSetVolumeControl(hmixer, volCtrl, lVol)
End Sub


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道素 2003-05-20
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

回复
道素 2003-05-20
自己控制
模块声明

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

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

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VB基础类
创建于2007-09-28

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