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Public Sub HoleInForm(Rectangular As Boolean, HoleWidth As Single, HoleHeight As Single, HoleLeft As Single, HoleTop As Single, Frm As Form)
'This will put a hole in the form (you can see through the form with that hole)
On Error GoTo error
Const RGN_DIFF = 4
Dim outer_rgn As Long
Dim inner_rgn As Long
Dim combined_rgn As Long
Dim wid As Single
Dim hgt As Single
Dim border_width As Single
Dim title_height As Single
If Frm.WindowState = vbMinimized Then Exit Sub
wid = ScaleX(Frm.width, vbTwips, vbPixels)
hgt = ScaleY(Frm.height, vbTwips, vbPixels)
outer_rgn = CreateRectRgn(0, 0, wid, hgt)
border_width = (wid - ScaleWidth) / 2
title_height = hgt - border_width - ScaleHeight
If Rectangular = True Then
inner_rgn = CreateRectRgn(HoleLeft, HoleTop, HoleWidth, HoleHeight)
Else
inner_rgn = CreateEllipticRgn(HoleLeft, HoleTop, HoleWidth, HoleHeight)
End If
combined_rgn = CreateRectRgn(0, 0, 0, 0)
CombineRgn combined_rgn, outer_rgn, inner_rgn, RGN_DIFF
SetWindowRgn Frm.hWnd, combined_rgn, True
Exit Sub
error: MsgBox Err.Description, vbExclamation, "Error"
End Sub
 Hole in the form

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