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• Make Form Transparent.

Make Form Transparent.

Makes a Form Trans Parent

Side Effects
No Controls are Visible on the Form

API Declarations
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


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Public Sub MakeTransparent(frm As Form)
'This code was takin from a AOL Visual Basic
'Message Board. It was submited by: SOOPRcow
  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
  rctFrame.Left = lpTL.x
  rctFrame.Top = lpTL.Y
  rctFrame.Right = lpBR.x
  rctFrame.Bottom = lpBR.Y
  rctClient.Left = Abs(rctFrame.Left)
  rctClient.Top = Abs(rctFrame.Top)
  rctClient.Right = rctClient.Right + Abs(rctFrame.Left)
  rctClient.Bottom = rctClient.Bottom + Abs(rctFrame.Top)
  rctFrame.Right = rctFrame.Right + Abs(rctFrame.Left)
  rctFrame.Bottom = rctFrame.Bottom + Abs(rctFrame.Top)
  rctFrame.Top = 0
  rctFrame.Left = 0
  '// 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
  '// Now lock the window's area to this created region
  SetWindowRgn frm.hWnd, hFrame, True
End Sub