有个窗体透明的函数,不知道你能否改成控件的,供参考: Option Explicit'Transparancy API's Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hWnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long Private Declare Function UpdateLayeredWindow Lib "user32" (ByVal hWnd As Long, ByVal hdcDst As Long, pptDst As Any, psize As Any, ByVal hdcSrc As Long, pptSrc As Any, crKey As Long, ByVal pblend As Long, ByVal dwFlags As Long) 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 LongPrivate Const GWL_EXSTYLE = (-20) Private Const LWA_COLORKEY = &H1 Private Const LWA_ALPHA = &H2 Private Const ULW_COLORKEY = &H1 Private Const ULW_ALPHA = &H2 Private Const ULW_OPAQUE = &H4 Private Const WS_EX_LAYERED = &H80000 Public Function isTransparent(ByVal hWnd As Long) As Boolean On Error Resume Next Dim Msg As Long Msg = GetWindowLong(hWnd, GWL_EXSTYLE) If (Msg And WS_EX_LAYERED) = WS_EX_LAYERED Then isTransparent = True Else isTransparent = False End If If Err Then isTransparent = False End If End FunctionPublic Function MakeTransparent(ByVal hWnd As Long, ByVal Perc As Integer) As Long Dim Msg As Long On Error Resume Next
Perc = 100 If Perc < 0 Or Perc > 255 Then MakeTransparent = 1 Else Msg = GetWindowLong(hWnd, GWL_EXSTYLE) Msg = Msg Or WS_EX_LAYERED SetWindowLong hWnd, GWL_EXSTYLE, Msg SetLayeredWindowAttributes hWnd, 0, Perc, LWA_ALPHA MakeTransparent = 0 End If If Err Then MakeTransparent = 2 End If End FunctionPublic Function MakeOpaque(ByVal hWnd As Long) As Long Dim Msg As Long On Error Resume Next Msg = GetWindowLong(hWnd, GWL_EXSTYLE) Msg = Msg And Not WS_EX_LAYERED SetWindowLong hWnd, GWL_EXSTYLE, Msg SetLayeredWindowAttributes hWnd, 0, 0, LWA_ALPHA MakeOpaque = 0 If Err Then MakeOpaque = 2 End If End FunctionPrivate Sub Form_Load() MakeTransparent Me.hWnd, 20 End Sub
Option Explicit'Transparancy API's
Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hWnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Private Declare Function UpdateLayeredWindow Lib "user32" (ByVal hWnd As Long, ByVal hdcDst As Long, pptDst As Any, psize As Any, ByVal hdcSrc As Long, pptSrc As Any, crKey As Long, ByVal pblend As Long, ByVal dwFlags As Long) 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 LongPrivate Const GWL_EXSTYLE = (-20)
Private Const LWA_COLORKEY = &H1
Private Const LWA_ALPHA = &H2
Private Const ULW_COLORKEY = &H1
Private Const ULW_ALPHA = &H2
Private Const ULW_OPAQUE = &H4
Private Const WS_EX_LAYERED = &H80000
Public Function isTransparent(ByVal hWnd As Long) As Boolean
On Error Resume Next
Dim Msg As Long
Msg = GetWindowLong(hWnd, GWL_EXSTYLE)
If (Msg And WS_EX_LAYERED) = WS_EX_LAYERED Then
isTransparent = True
Else
isTransparent = False
End If
If Err Then
isTransparent = False
End If
End FunctionPublic Function MakeTransparent(ByVal hWnd As Long, ByVal Perc As Integer) As Long
Dim Msg As Long
On Error Resume Next
Perc = 100
If Perc < 0 Or Perc > 255 Then
MakeTransparent = 1
Else
Msg = GetWindowLong(hWnd, GWL_EXSTYLE)
Msg = Msg Or WS_EX_LAYERED
SetWindowLong hWnd, GWL_EXSTYLE, Msg
SetLayeredWindowAttributes hWnd, 0, Perc, LWA_ALPHA
MakeTransparent = 0
End If
If Err Then
MakeTransparent = 2
End If
End FunctionPublic Function MakeOpaque(ByVal hWnd As Long) As Long
Dim Msg As Long
On Error Resume Next
Msg = GetWindowLong(hWnd, GWL_EXSTYLE)
Msg = Msg And Not WS_EX_LAYERED
SetWindowLong hWnd, GWL_EXSTYLE, Msg
SetLayeredWindowAttributes hWnd, 0, 0, LWA_ALPHA
MakeOpaque = 0
If Err Then
MakeOpaque = 2
End If
End FunctionPrivate Sub Form_Load()
MakeTransparent Me.hWnd, 20
End Sub