Как сделать форму прозрачной - VB

Option Explicit
 
Declare Function GetWindowRect Lib 'user32' (ByVal hwnd As Long, lpRect As RECT) As Long
Declare Function GetClientRect Lib 'user32' (ByVal hwnd As Long, lpRect As RECT) As Long
Declare Function CombineRgn Lib 'gdi32' (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Declare Function CreateRectRgn Lib 'gdi32' _
(ByVal X1 As Long, ByVal Y1 As Long, _
ByVal X2 As Long, ByVal Y2 As Long) As Long
 
Declare Function ScreenToClient Lib 'user32' _
(ByVal hwnd As Long, lpPoint As POINTAPI) As Long
 
Declare Function SetWindowRgn Lib 'user32' _
(ByVal hwnd As Long, ByVal hRgn As Long, _
ByVal bRedraw As Boolean) As Long
 
Public Const RGN_AND = 1
Public Const RGN_COPY = 5
Public Const RGN_DIFF = 4
Public Const RGN_OR = 2
Public Const RGN_XOR = 3
 
Type POINTAPI
    X As Long
    Y As Long
End Type
 
Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type
 
Public Sub MakeTransparent(frm As Form)
    
    Dim rctClient As RECT, rctFrame As RECT
    Dim hClient As Long, hFrame As Long
 
    '// Grab client area and frame area
    GetWindowRect frm.hwnd, rctFrame
    GetClientRect frm.hwnd, rctClient
 
    '// Convert client coordinates to screen coordinates
    Dim lpTL As POINTAPI, lpBR As POINTAPI
 
    lpTL.X = rctFrame.Left
    lpTL.Y = rctFrame.Top
    lpBR.X = rctFrame.Right
    lpBR.Y = rctFrame.Bottom
    
    ScreenToClient frm.hwnd, lpTL
    ScreenToClient frm.hwnd, lpBR
 
    With rctFrame
        .Left = lpTL.X
        .Top = lpTL.Y
        .Right = lpBR.X
        .Bottom = lpBR.Y
    End With
    
    With rctClient
        .Left = Abs(rctFrame.Left)
        .Top = Abs(rctFrame.Top)
        .Right = rctClient.Right + Abs(rctFrame.Left)
        .Bottom = rctClient.Bottom + Abs(rctFrame.Top)
    End With
    
    With rctFrame
        .Right = rctFrame.Right + Abs(rctFrame.Left)
        .Bottom = rctFrame.Bottom + Abs(rctFrame.Top)
        .Top = 0
        .Left = 0
    End With
    
    '// Convert RECT structures to region handles
    hClient = CreateRectRgn(rctClient.Left, rctClient.Top, rctClient.Right, rctClient.Bottom)
    hFrame = CreateRectRgn(rctFrame.Left, rctFrame.Top, rctFrame.Right, rctFrame.Bottom)
 
    '// Create the new 'Transparent' region
    CombineRgn hFrame, hClient, hFrame, RGN_XOR
 
    '// Combine the regions of the controls
    '// on the form with the 'transparent' region.
    Dim C As Control, rctControl As RECT, hControl As Long
    For Each C In frm
        On Error Resume Next
       '// Get the control's area
        GetWindowRect C.hwnd, rctControl
        
        '// Convert to client coordinates
        lpTL.X = rctControl.Left
        lpTL.Y = rctControl.Top
        lpBR.X = rctControl.Right
        lpBR.Y = rctControl.Bottom
        
        ScreenToClient frm.hwnd, lpTL
        ScreenToClient frm.hwnd, lpBR
        
        With rctControl
            .Left = lpTL.X + rctClient.Left
            .Top = lpTL.Y + rctClient.Top
            .Right = lpBR.X + rctClient.Left
            .Bottom = lpBR.Y + rctClient.Top
        End With
 
        hControl = CreateRectRgn(rctControl.Left, rctControl.Top, rctControl.Right, rctControl.Bottom)
        CombineRgn hFrame, hControl, hFrame, RGN_OR
    Next C
 
    '// Now lock the window's area to this created region
    SetWindowRgn frm.hwnd, hFrame,