visual basic using a window handle to close a dialog box

Option Explicit
 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As Long
Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, _
ByVal cch As Long) As Long
Private Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hwnd As Long) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
 
'--------------------------------------------------------
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal lhWndP As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal lhWndP As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) 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 Const BM_CLICK = &HF5
Private Const WM_CLOSE = &H10
'------------------------------------------------------------
 
 
Private Const GW_HWNDNEXT = 2
 
Private Sub Command1_Click()
    Dim lhWndP As Long
    Dim hWnd1 As Long
    If GetHandleFromPartialCaption(lhWndP, "Connect to") = True Then
        MsgBox "Found Window Handle: " & lhWndP, vbOKOnly + vbInformation
          hWnd1 = FindWindowEx(lhWndP, 0, "Button", "&Cancel")
         Call PostMessage(lhWndP, BM_CLICK, 0, 0)
         SendMessage lhWndP, WM_CLOSE, 0&, 0&
    Else
        MsgBox "Window ' - connect to window not' not found!", vbOKOnly + vbExclamation
    End If
End Sub
 
Private Function GetHandleFromPartialCaption(ByRef lWnd As Long, ByVal sCaption As String) As Boolean
    Dim lhWndP As Long
    Dim sStr As String
    GetHandleFromPartialCaption = False
    lhWndP = FindWindow(vbNullString, vbNullString) 'PARENT WINDOW
    Do While lhWndP <> 0
        sStr = String(GetWindowTextLength(lhWndP) + 1, Chr$(0))
        GetWindowText lhWndP, sStr, Len(sStr)
        sStr = Left$(sStr, Len(sStr) - 1)
        If InStr(1, sStr, sCaption) > 0 Then
            GetHandleFromPartialCaption = True
            lWnd = lhWndP
            Exit Do
        End If
        lhWndP = GetWindow(lhWndP, GW_HWNDNEXT)
    Loop
End Function

                                  

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