Option Explicit
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Declare Function EnumChildWindows Lib "user32" (ByVal hWndParent As Long, ByVal lpEnumFunc As Long, ByVal lParam As Long) As Long
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hWnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hWnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Public Const WM_GETTEXT = &HD
Public Const WM_GETTEXTLENGTH = &HE
Type LV_TEXT
    sItemText As String * 80
End Type
Public CajaTexto As Long
Public Function Procesos(ByVal hWnd2 As Long, lParam As String) As Boolean
Dim Nombre As String * 255, nombreClase As String * 255
Dim Nombre2 As String, nombreClase2 As String, texto As LV_TEXT ' * 255
Dim X As Long, Y As Long, nCount As Long, jaja As Long
X = GetWindowText(hWnd2, Nombre, 255)
Y = GetClassName(hWnd2, nombreClase, 255)

Nombre = Left(Nombre, X)
nombreClase = Left(nombreClase, Y)
Nombre2 = Trim(Nombre)
nombreClase2 = Trim(nombreClase)
If nombreClase2 = "ThunderRT6TextBox" And Nombre2 = "Text1" Then
   MsgBox "Bien"
   CajaTexto = hWnd2
   nCount = SendMessage(hWnd2, WM_GETTEXTLENGTH, 0, 0&)
   MsgBox "Bien2 " & nCount
   If nCount = 0 Then Exit Function
   jaja = SendMessage(hWnd2, WM_GETTEXT, nCount + 1, texto)
   MsgBox "Bien3 " & jaja
   MsgBox "Bien4 " & texto.sItemText
   Exit Function
End If
If Nombre2 = "" And nombreClase2 = "" Then
 Procesos = False
Else
 Procesos = True
End If
End Function

=====EN UN FORM=======
Dim hWnd1 As Long

Private Sub Command1_Click()
hWnd1 = 0
If Ventana = True Then
    EnumChildWindows hWnd1, AddressOf Procesos, 1 'lParam
Else
    hWnd1 = 0
    CajaTexto = 0
End If
Timer1.Enabled = True
End Sub

Private Sub Timer1_Timer()
If hWnd1 <> 0 Then
    Label1.Caption = "Encontrada"
    Call Procesos(CajaTexto, 0)
    EnumChildWindows hWnd1, AddressOf Procesos, 1 'lParam
Else
    Label1.Caption = "PAILAS"
    hWnd1 = 0
    CajaTexto = 0
    Timer1.Enabled = False
    Call Command1_Click
End If
End Sub

Private Function Ventana() As Boolean
hWnd1 = FindWindow(vbNullString, "Form1")
If hWnd1 > 0 Then Ventana = True
End Function

Type LV_TEXT
    sItemText As String * 80
End Type