【VB技巧】VB半透明窗口效果实现代码

VB半透明窗口效果实现代码：

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 crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags 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 Sub Form_Load()
    Dim Rtn As Long
    Rtn = GetWindowLong(hwnd, GWL_EXSTYLE)
    Rtn = Rtn Or WS_EX_LAYERED
    SetWindowLong hwnd, GWL_EXSTYLE, Rtn
    SetLayeredWindowAttributes hwnd, 0, 200, LWA_ALPHA
End Sub

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