[AccessD] Just for fun! Playing With Regions!

Okay, here's a little code I whipped up for a friend.

Just put this into a module (watch for word wrap):

Option Compare Database
Private Declare Function SetWindowRgn Lib "user32" (ByVal hwnd As Long,
ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As
Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long,
lpRect As RECT) As Long
Private Declare Function CreateEllipticRgn Lib "gdi32" (ByVal X1 As Long,
ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long,
ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long)
As Long
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal
Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type
Private Const RGN_XOR = 3
Function HoleOutForm(ByVal intHwnd As Long)
Dim X As Long
Dim rt As RECT
Dim rtCircle As RECT
Dim dwReturn As Long
Dim InitialRegion As Long
Dim i As Long
Dim intMax As Long
dwReturn = GetWindowRect(intHwnd, rt)
rt.Bottom = rt.Bottom - rt.Top
rt.Top = 0
rt.Right = rt.Right - rt.Left
rt.Left = 0
InitialRegion = CreateRectRgn(rt.Left, rt.Top, rt.Right, rt.Bottom)
rtCircle.Bottom = ((rt.Bottom - rt.Top) / 2) + rt.Top + 1
rtCircle.Top = ((rt.Bottom - rt.Top) / 2) + rt.Top - 1
rtCircle.Right = ((rt.Right - rt.Left) / 2) + rt.Left + 1
rtCircle.Left = ((rt.Right - rt.Left) / 2) + rt.Left - 1
If rt.Bottom > rt.Right Then
    intMax = rt.Bottom
Else
    intMax = rt.Right
End If
For i = 1 To intMax
    X = CreateEllipticRgn(rtCircle.Left, rtCircle.Top, rtCircle.Right,
rtCircle.Bottom)
    InitialRegion = CreateRectRgn(rt.Left, rt.Top, rt.Right, rt.Bottom)
    dwReturn = CombineRgn(InitialRegion, InitialRegion, X, RGN_XOR)
    SetMainWindowRegion InitialRegion, intHwnd
    rtCircle.Bottom = rtCircle.Bottom + 1
    rtCircle.Top = rtCircle.Top - 1
    rtCircle.Left = rtCircle.Left - 1
    rtCircle.Right = rtCircle.Right + 1
    DeleteObject X
    DeleteObject InitialRegion
Next i
DeleteObject X
DeleteObject InitialRegion
End Function
Private Function SetMainWindowRegion(cRgn As Long, intHwnd As Long)
Dim dwReturn As Long
dwReturn = SetWindowRgn(intHwnd, cRgn, True)
End Function


Now, create a form, and put the following behind a command button:

HoleOutForm Me.Hwnd
DoCmd.Close acForm, Me.Name

Then put a second button on the form, and put this code behind it:

HoleOutForm Application.hWndAccessApplication
DoCmd.Quit

Save the form, and try out the buttons.

Enjoy!

Drew