Использование GetDlgItemText для получения текста из контрола - VB

Формулировка задачи:

Пытаюсь получить текст из блокнота. GetDlgItemText ничего не передает в буфер. Код ошибки - 0. Помогите разобраться.

                    Листинг программы
                
 
                            
                        
Option Explicit
 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) 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 GetDlgItem Lib "user32" (ByVal hDlg As Long, ByVal nIDDlgItem As Long) As Long
Private Declare Function GetDlgItemText Lib "user32" Alias "GetDlgItemTextA" (ByVal hDlg As Long, ByVal nIDDlgItem As Long, lpString As String, ByVal nMaxCount As Long) As Long
 
Sub main()
    Dim H_Parent As Long, H_Control As Long, H_Item As Long
    Dim lngIndex As Long
    Dim strText As String
    Dim lngTextLength As Long
    
    H_Parent = FindWindow("notepad", vbNullString) 'Try with FindWindow
    
        If H_Parent <> 0 Then
            H_Control = FindWindowEx(H_Parent, 0, "edit", vbNullString)
            If H_Control <> 0 Then
                For lngIndex = 0 To 1000000
                    H_Item = GetDlgItem(H_Parent, lngIndex)
                    If H_Item = H_Control Then
                        strText = Space(255)
                        lngTextLength = GetDlgItemText(H_Parent, lngIndex, strText, len(strText))
                        Debug.Print Err.LastDllError
                        If lngTextLength <> 0 Then
                            Debug.Print lngIndex, H_Item, lngTextLength, strText
                        End If
                    End If
                Next
            End If
        End If
End Sub

GetDlgItem - http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx GetDlgItemText - http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

Решение задачи: «Использование GetDlgItemText для получения текста из контрола»

textual
                            Листинг программы 
                        
 
                            
                        
Option Explicit
 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) 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 SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
 
Private Const WM_GETTEXT = &HD
Private Const WM_GETTEXTLENGTH = &HE
 
Private Sub Form_Load()
    Dim H_Parent As Long, H_Control As Long
    Dim strText As String
    Dim lngTextLength As Long
    
    H_Parent = FindWindow("notepad", vbNullString) 'Try with FindWindow
    
    If H_Parent <> 0 Then
        H_Control = FindWindowEx(H_Parent, 0, "edit", vbNullString)
        If H_Control <> 0 Then
            lngTextLength = SendMessage(H_Control, WM_GETTEXTLENGTH, 0, ByVal 0&)
            strText = Space(lngTextLength + 1)
            SendMessage H_Control, WM_GETTEXT, lngTextLength + 1, ByVal strText
            strText = Left(strText, lngTextLength)
        End If
    End If
End Sub