【VB】窗体透明三：窗体、控件变透明

最新推荐文章于 2021-01-31 00:50:55 发布

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本文介绍了一种使用VBA实现窗体半透明的方法，通过调用Windows API函数`SetWindowLong`、`SetLayeredWindowAttributes`等来设置窗体的透明度和颜色键。这种方法适用于希望为应用程序增加视觉效果的开发者。

Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Const WS_EX_LAYERED = &H80000
Private Const GWL_EXSTYLE = (-20)
Private Const LWA_ALPHA = &H2
Private Const LWA_COLORKEY = &H1
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
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 Sub SetFormTranslucency(hwnd As Long, crKey As Long, bAlpha As Byte, dwFlags As Long)'实现半透明窗体
Dim rtn As Long
    rtn = GetWindowLong(hwnd, GWL_EXSTYLE)
    rtn = rtn Or WS_EX_LAYERED
    SetWindowLong hwnd, GWL_EXSTYLE, rtn
    SetLayeredWindowAttributes hwnd, crKey, bAlpha, dwFlags
   
End Sub
Private Sub Form_Load()
    Call SetFormTranslucency(Me.hwnd, 0, 200, 2) '窗体半透明，200为透明值
End Sub

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