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     こんにちは。 
 
右端の座標を拾ってくる関数などは特に無いですね。 
ht tp://www.moug.net/faq/viewtopic.php?t=60244&highlight=SendInput 
上記URLのAbyssさんのコードをお借りしています。 
 
シート右側のスクロールバーの位置を拾ってきて、そこにMouseを操作して 
図形を作成。そのLeftを取得し、作成した図形を削除。 
 
Private Type RECT 
   Left As Long 
   Top As Long 
   Right As Long 
   Bottom As Long 
End Type 
 
Private Declare Function SetCursorPos Lib "user32" ( _ 
   ByVal x As Long, _ 
   ByVal y As Long) As Long 
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" ( _ 
   ByVal hWnd1 As Long, _ 
   ByVal hWnd2 As Long, _ 
   ByVal lpsz1 As String, _ 
   ByVal lpsz2 As String) As Long 
Private Declare Function GetWindowRect Lib "user32" ( _ 
   ByVal hWnd As Long, _ 
   lpRect As RECT) As Long 
Private Declare Sub mouse_event Lib "user32" ( _ 
   ByVal dwFlags As Long, _ 
   ByVal dx As Long, _ 
   ByVal dy As Long, _ 
   ByVal cButtons As Long, _ 
   ByVal dwExtraInfo As Long) 
Private Const MOUSEEVENTF_LEFTDOWN = &H2 ' left button down 
Private Const MOUSEEVENTF_LEFTUP = &H4 ' left button up 
 
Function GetRWindowPoint(ByRef sngLeft As Single) As Boolean 
 Dim Rc As RECT 
 Dim hWnd As Long 
  
 hWnd = Application.hWnd 'hWnd = FindWindowEx(0, 0, "XLMAIN", Application.Caption) 
 hWnd = FindWindowEx(hWnd, 0, "XLDESK", vbNullString) 
 hWnd = FindWindowEx(hWnd, 0, "EXCEL7", vbNullString) 
 hWnd = FindWindowEx(hWnd, 0, "ScrollBar", vbNullString) 
 If hWnd = 0 Then Exit Function 
  
 GetWindowRect hWnd, Rc 
 AppActivate Application.Caption 
 Application.CommandBars.FindControl(ID:=1111).accDoDefaultAction 
  
 SetCursorPos Rc.Left - 1, (Rc.Top + Rc.Bottom) \ 2 
 mouse_event MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0 
 mouse_event MOUSEEVENTF_LEFTUP, 0, 0, 0, 0 
 
 DoEvents 
 If TypeName(Selection) = "Range" Then Exit Function 
  
 With Selection 
  sngLeft = .Left 
  .Delete 
 End With 
 GetRWindowPoint = True 
End Function 
 
Sub Sample001() 
 Dim l As Single 
 'ActiveSheetに図形が一つ以上あるとして。 
 With ActiveSheet.Shapes(1) 
  If GetRWindowPoint(l) Then 
   .Left = l - .Width 
  End If 
 End With 
End Sub 
 
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