vb將窗體中的控件或某種顏色透明

Option Explicit
' ******************** 窗體透明 ********************
'***Module.bas
'****
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long

Public Const WS_EX_LAYERED = &H80000
Public Const GWL_EXSTYLE = (-20)
Public Const LWA_ALPHA = &H2
Public Const LWA_COLORKEY = &H1
Public Const WS_EX_TRANSPARENT = &H20&

'**************
'***Form1.frm
'-------------------------------------------------**
Private Sub Form_Load()
    Dim rtn As Long
    rtn = GetWindowLong(hwnd, GWL_EXSTYLE)

    '全窗體  完全透明, 通透         全消失
'    SetWindowLong hwnd, GWL_EXSTYLE, rtn Or WS_EX_LAYERED

    '    '將某個色彩 完全通透           部分消失
'        lbl.BackColor = vbBlue                                      '設置一個色彩
'        Form1.BackColor = vbBlue
'        SetWindowLong hwnd, GWL_EXSTYLE, rtn Or WS_EX_LAYERED
'        SetLayeredWindowAttributes hwnd, vbBlue, 0, LWA_COLORKEY

    '    '通透 ,  半透明
'        SetWindowLong Me.hwnd, GWL_EXSTYLE, rtn Or WS_EX_LAYERED Or WS_EX_TRANSPARENT
'        SetLayeredWindowAttributes Me.hwnd, 0, 128, LWA_ALPHA      ' The level of transparency (0 - 255)

    '不通透,    半透明
    SetWindowLong hwnd, GWL_EXSTYLE, rtn Or WS_EX_LAYERED
    SetLayeredWindowAttributes hwnd, 0, 200, LWA_ALPHA   '(句柄  ,掩碼顏色[RGB]  ,  透明程度[0-255],  )
    'hwnd
    'crKey               為顏色值，// 掩碼的顏色，可以用RGB(r,g,b)來指定
    'bAlpha          是透明度，取值范圍是[0,255]
    'dwFlags     是透明方式，可以取兩個值：
    '                =LWA_ALPHA時，crKey參數無效，bAlpha參數有效；
    '                =LWA_COLORKEY時，窗體中的所有顏色為crKey的地方將變為透明，bAlpha參數無效。
    '
End Sub

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