Private Declare Function FindWindowX Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, _
ByVal hWnd2 As Long, ByVal lpsz1 As Long, ByVal lpsz2 As Long) As Long

Private Declare Function ShowWindow Lib "user32" (ByVal hWnd As Long, ByVal nCmdShow As Long) As Long

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function BringWindowToTop Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hWnd 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 hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Integer) As Long
Private Const WM_PASTE = &H302
Private Const WM_KEYDOWN = &H100
Private Const WM_KEYUP = &H101

Sub Three()

    hWind = FindWindow(vbNullString, "Calculadora")
    cWind = FindWindowX(hWind, 0, 0, 0)
    Debug.Print PostMessage(cWind, WM_KEYDOWN, vbKey1, 0)
    Debug.Print PostMessage(cWind, WM_KEYDOWN, vbKey2, 0)
    Debug.Print PostMessage(cWind, WM_KEYDOWN, vbKey3, 0)

End Sub


Private Sub Command1_Click()
    Three
End Sub


Sub Three2()

    hWind = FindWindow(vbNullString, "Calculadora")
    cWind = FindWindowX(hWind, 0, 0, 0)
    Debug.Print PostMessage(cWind, WM_KEYDOWN, vbKey1, 0)
    Debug.Print PostMessage(cWind, WM_KEYDOWN, vbKey2, 0)
    Debug.Print PostMessage(cWind, WM_KEYDOWN, vbKey3, 0)
End Sub


Private Sub Command2_Click()
    Three2
End Sub

Private Sub Command3_Click()
    lnghwnd = FindWindow(vbNullString, "Calculadora") 
    Debug.Print lnghwnd
    BringWindowToTop lnghwnd
    ShowWindow lnghwnd, 1
    'strProv = "Esta es una prueba"
    
    'For i = 1 To Len(strProv)
    'keybd_event Asc(Mid(strProv, i, 1)), 0, 0, 0
    'keybd_event Asc(Mid(strProv, i, 1)), 0, KEYEVENTF_KEYUP, 0
    'Next i
    
    'keybd_event 13, 0, 0, 0
    'keybd_event 13, 0, KEYEVENTF_KEYUP, 0
    
    If lnghwnd <> 0 Then
    
        SendKeys ("123")
        SendKeys ("{+}")
        SendKeys ("456")
        SendKeys ("{enter}")
        'Timer2.Enabled = True
        'Me.WindowState = 1
        Exit Sub
    End If
End Sub

Private Function FromClip(hWnd As Long)
    SendMessage hWnd, WM_PASTE, 0, 0
End Function

Private Sub Command4_Click()
    lnghwnd = FindWindow(vbNullString, "Calculadora") 
    Debug.Print lnghwnd
    BringWindowToTop lnghwnd
    ShowWindow lnghwnd, 1
    'strProv = "Esta es una prueba"
    
    'For i = 1 To Len(strProv)
    'keybd_event Asc(Mid(strProv, i, 1)), 0, 0, 0
    'keybd_event Asc(Mid(strProv, i, 1)), 0, KEYEVENTF_KEYUP, 0
    'Next i
    
    'keybd_event 13, 0, 0, 0
    'keybd_event 13, 0, KEYEVENTF_KEYUP, 0
    
    If lnghwnd <> 0 Then
        FromClip (lnghwnd)
        'SendKeys ("123")
        'SendKeys ("{+}")
        'SendKeys ("456")
        'SendKeys ("{enter}")
        'Timer2.Enabled = True
        'Me.WindowState = 1
        Exit Sub
    End If
End Sub