Vb6怎么能实现 将设备管理器的一个音频设备禁用，再启用

在VB6中实现禁用和启用设备管理器中的音频设备并不直接支持，需要使用Windows API调用来完成。你可以利用设备管理器的接口进行操作，比如通过 SetupDi 系列API函数和 CM 系列API函数实现。

以下是一个示例代码，用于禁用和启用音频设备：

1. 声明API函数和常量：

' Module: Module1
Option Explicit

Private Const DIGCF_PRESENT = &H2
Private Const DIGCF_DEVICEINTERFACE = &H10
Private Const DICS_DISABLE = &H1
Private Const DICS_ENABLE = &H2
Private Const DIREG_DEV = &H1
Private Const DICS_FLAG_GLOBAL = &H1
Private Const DICS_FLAG_CONFIGSPECIFIC = &H2

Private Type SP_DEVINFO_DATA
    cbSize As Long
    ClassGuid As GUID
    DevInst As Long
    Reserved As Long
End Type

Private Type GUID
    Data1 As Long
    Data2 As Integer
    Data3 As Integer
    Data4(7) As Byte
End Type

Private Declare Function SetupDiGetClassDevs Lib "setupapi.dll" Alias "SetupDiGetClassDevsA" (ByRef ClassGuid As GUID, ByVal Enumerator As Long, ByVal hwndParent As Long, ByVal Flags As Long) As Long
Private Declare Function SetupDiEnumDeviceInfo Lib "setupapi.dll" (ByVal DeviceInfoSet As Long, ByVal MemberIndex As Long, ByRef DeviceInfoData As SP_DEVINFO_DATA) As Long
Private Declare Function CM_Disable_DevNode Lib "cfgmgr32.dll" (ByVal dnDevInst As Long, ByVal ulFlags As Long) As Long
Private Declare Function CM_Enable_DevNode Lib "cfgmgr32.dll" (ByVal dnDevInst As Long, ByVal ulFlags As Long) As Long
Private Declare Function SetupDiDestroyDeviceInfoList Lib "setupapi.dll" (ByVal DeviceInfoSet As Long) As Long

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)

' GUID of audio devices class
Private Const AUDIO_CLASS_GUID As String = "{4d36e96c-e325-11ce-bfc1-08002be10318}"

2. 转换GUID字符串到GUID类型：

Private Function StringToGUID(guidString As String) As GUID
    Dim p(0 To 15) As Byte
    Dim guid As GUID
    Dim i As Long

    p(0) = CByte("&H" & Mid$(guidString, 2, 2))
    p(1) = CByte("&H" & Mid$(guidString, 4, 2))
    p(2) = CByte("&H" & Mid$(guidString, 6, 2))
    p(3) = CByte("&H" & Mid$(guidString, 8, 2))

    p(4) = CByte("&H" & Mid$(guidString, 11, 2))
    p(5) = CByte("&H" & Mid$(guidString, 13, 2))

    p(6) = CByte("&H" & Mid$(guidString, 16, 2))
    p(7) = CByte("&H" & Mid$(guidString, 18, 2))

    For i = 0 To 7
        p(8 + i) = CByte("&H" & Mid$(guidString, 21 + 2 * i, 2))
    Next i

    CopyMemory guid, p(0), 16
    StringToGUID = guid
End Function

3. 设备禁用和启用函数：

Private Function EnableDevice(enable As Boolean) As Boolean
    Dim hDevInfo As Long
    Dim DevInfoData As SP_DEVINFO_DATA
    Dim guid As GUID
    Dim memberIndex As Long
    Dim success As Long

    guid = StringToGUID(AUDIO_CLASS_GUID)

    hDevInfo = SetupDiGetClassDevs(guid, 0, 0, DIGCF_PRESENT Or DIGCF_DEVICEINTERFACE)
    If hDevInfo = 0 Then
        MsgBox "Error getting device information set."
        Exit Function
    End If

    DevInfoData.cbSize = Len(DevInfoData)
    memberIndex = 0
    Do While SetupDiEnumDeviceInfo(hDevInfo, memberIndex, DevInfoData)
        If enable Then
            success = CM_Enable_DevNode(DevInfoData.DevInst, 0)
        Else
            success = CM_Disable_DevNode(DevInfoData.DevInst, 0)
        End If

        If success <> 0 Then
            MsgBox "Error " & IIf(enable, "enabling", "disabling") & " device."
        Else
            MsgBox "Device " & IIf(enable, "enabled", "disabled") & " successfully."
        End If

        memberIndex = memberIndex + 1
    Loop

    SetupDiDestroyDeviceInfoList hDevInfo
End Function

4. 调用禁用和启用函数：

Private Sub DisableAudioDevice()
    Call EnableDevice(False)
End Sub

Private Sub EnableAudioDevice()
    Call EnableDevice(True)
End Sub

注意：这些操作需要管理员权限，并且直接操作设备管理器中的设备可能会影响系统稳定性，请在测试环境中使用，并确保有备份计划。

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