怎样在播放视频画上显示半透明窗体

[wangqun168]

以下这些可以实现半透明窗体，但是遇到播放VCD时画面还是看不到播放VCD的画面
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