制造出透明的窗体(Form)

答案：
制造出透明的窗体(Form)
注释：form上有Command1, command2两个Button并事先设定form之BorderStyle = 0
    
  Option Explicit
    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
    Const GWL_EXSTYLE = (-20)
    Const WS_EX_TRANSPARENT = &H20&
    Private PreValue As Long
    
  Private Sub Command2_Click() 注释：还原变成不透明
    Call SetWindowLong(Me.hwnd, GWL_EXSTYLE, PreValue)
    Me.Hide
  Me.Show
  End Sub
    
  Private Sub Form_Load()
    Dim i As Long
    
  i = GetWindowLong(Me.hwnd, GWL_EXSTYLE)
    注释：变成透明的Form
  PreValue = SetWindowLong(Me.hwnd, GWL_EXSTYLE, i Or WS_EX_TRANSPARENT)
    Me.Show
  DoEvents
  Command1.Refresh 注释：令Command1可见
    Command2.Refresh 注释：令Command2可见
    End Sub
  

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