VB窗体透明控件不透明代码

    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()

     Me.BackColor = &HFF0000

     Dim rtn As Long

     Dim BorderStyler

     BorderStyler = 0

     rtn = GetWindowLong(hwnd, GWL_EXSTYLE)

     rtn = rtn Or WS_EX_LAYERED

     SetWindowLong hwnd, GWL_EXSTYLE, rtn

     SetLayeredWindowAttributes hwnd, &HFF0000, 0, LWA_COLORKEY

    End Sub