vb教程之制作透明的任务栏

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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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