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制作透明的任务栏

(加入日期: 2002-03-26 )

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Option Explicit

Private Const GWL_EXSTYLE = (-20)
Private Const WS_EX_LAYERED = &H80000
Private Const WS_EX_TRANSPARENT = &H20&
Private Const LWA_ALPHA = &H2&

Private Declare Function FindWindow Lib "User32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetWindowLong Lib "User32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "User32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SetLayeredWindowAttributes Lib "User32" (ByVal hwnd As Long, ByVal crey As Byte, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long

Private Const ERROR_SUCCESS = 0&
Private Const REG_OPTION_NON_VOLATILE = 0    ' Key is preserved when system is rebooted

Private Const SYNCHRONIZE = &H100000
Private Const STANDARD_RIGHTS_ALL = &H1F0000
Private Const KEY_QUERY_value = &H1
Private Const KEY_SET_value = &H2
Private Const KEY_CREATE_SUB_KEY = &H4
Private Const KEY_ENUMERATE_SUB_KEYS = &H8
Private Const KEY_NOTIFY = &H10
Private Const KEY_CREATE_LINK = &H20
Private Const KEY_ALL_ACCESS = ((STANDARD_RIGHTS_ALL Or KEY_QUERY_value Or _
  KEY_SET_value Or KEY_CREATE_SUB_KEY Or KEY_ENUMERATE_SUB_KEYS Or _
  KEY_NOTIFY Or KEY_CREATE_LINK) And (Not SYNCHRONIZE))

Private Declare Function RegCreateKeyEx Lib "advapi32.dll" Alias "RegCreateKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal lpClass As String, ByVal dwOptions As Long, ByVal samDesired As Long, lpSecurityAttributes As Any, phkResult As Long, lpdwDisposition As Long) As Long
Private Declare Function RegSetvalueEx Lib "advapi32.dll" Alias "RegSetvalueExA" (ByVal hKey As Long, ByVal lpvalueName As String, ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, ByVal cbData As Long) As Long     ' Note that if you declare the lpData parameter as String, you must pass it By value.
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long

Private Function prvGetLevel() As Byte
  Dim LnLevel As Byte
  Dim LsCommand As String
  Dim LnToken As Integer
  Dim LsKey As String
  Dim LsInput As String
  
  LsCommand = Command()
  LsKey = "/translevel:"
  LnToken = InStr(1, LsCommand, LsKey, vbTextCompare)
  If (LnToken = 0) Then
    LsInput = InputBox("Enter transparency level for task bar" & vbCrLf & "1 to 255", , 100)
  Else
    Dim LnEnd As Integer
    
    LnToken = (LnToken + Len(LsKey))
    LsInput = Mid$(LsCommand, LnToken, 3)
  End If
  If (Trim$(LsInput) = 0) Then
    LnLevel = 100
  Else
    LnLevel = Val(Left$(LsInput, 3))
  End If
  If (LnLevel > 255) Then LnLevel = 255
  If (LnLevel < 50) Then LnLevel = 50
  prvGetLevel = LnLevel
End Function

Private Sub prvMakeTransparent(LhWnd As Long, bLevel As Byte)
  Dim lOldStyle As Long
  lOldStyle = GetWindowLong(LhWnd, GWL_EXSTYLE)
  SetWindowLong LhWnd, GWL_EXSTYLE, lOldStyle Or WS_EX_LAYERED
  SetLayeredWindowAttributes LhWnd, 0, bLevel, LWA_ALPHA
End Sub

Public Sub Main()
  Dim LhWnd As Long
  Dim LnLevel As Byte

  LnLevel = prvGetLevel
  If (InStr(1, Command(), "/silent", vbTextCompare) = 0) Then
  '  If SetAutoStart(LnLevel) Then
  '    MsgBox "TransTaskBar will be loaded when OS starts.", vbOKOnly Or vbInFORMation
  '  End If
  Else
  End If
  LhWnd = FindWindow("Shell_TrayWnd", vbNullString)
  If (LhWnd <> 0) Then
    prvMakeTransparent LhWnd, LnLevel
  End If
End Sub

Public Function SetAutoStart(nLevel As Byte) As Boolean
  Dim nRet As Long
  Dim hKey As Long
  Dim nResult As Long
  Dim LsFullPath As String
 
  With App
    LsFullPath = App.Path & "\" & App.EXEName & ".exe"
  End With
  If (InStr(1, LsFullPath, " ") > 0) Then
    LsFullPath = """" & LsFullPath & """"
  End If
  LsFullPath = LsFullPath & " /silent /TransLevel:" & CStr(nLevel)
  ' Open (or create and open) key
  nRet = RegCreateKeyEx(&H80000001, "Software\Microsoft\Windows\CurrentVersion\Run", 0&, vbNullString, _
    REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, ByVal 0&, hKey, nResult)
  If nRet = ERROR_SUCCESS Then
  ' Write new value to registry
    nRet = RegSetvalueEx(hKey, App.EXEName, 0&, 1&, ByVal LsFullPath, Len(LsFullPath))
    Call RegCloseKey(hKey)
  End If
  SetAutoStart = (nRet = ERROR_SUCCESS)
End Function

  
资料来源:Leontti A. Ramos M. 

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