recuperación - Entrada de contraseña de VBA con función de cancelar

sacar contraseña vba

Question

He estado utilizando el cuadro de texto de contraseña estándar escrito por Daniel Klann ( http://www.ozgrid.com/forum/showthread.php?t=72794 ) para ocultar las entradas de contraseña.

El principal problema es que el InputBox estándar devuelve campos vacíos y cancela de la misma manera. Application.InputBox sin embargo, es capaz de devolver un False al cancelar.

Actualizar el script de Daniel Klann para que funcione con Application.InputBox me supera. ¿Cómo se haría esto?

Aquí está el código de Daniel:

Option Explicit
''////////////////////////////////////////////////////////////////////
''Password masked inputbox
''Allows you to hide characters entered in a VBA Inputbox.
''
''Code written by Daniel Klann
''http://www.danielklann.com/
''March 2003
''// Kindly permitted to be amended
''// Amended by Ivan F Moala
''// http://www.xcelfiles.com
''// April 2003
''// Works for Xl2000+ due the AddressOf Operator
''////////////////////////////////////////////////////////////////////
''******************** CALL FROM FORM *********************************
'' Dim pwd As String
''
'' pwd = InputBoxDK("Please Enter Password Below!", "Database Administration Security Form.")
''
'' ''If no password was entered.
'' If pwd = "" Then
'' MsgBox "You didn''t enter a password! You must enter password to ''enter the Administration Screen!" _
'' , vbInformation, "Security Warning"
'' End If
''**************************************
''API functions to be used
Private Declare Function CallNextHookEx _
Lib "user32" ( _
ByVal hHook As Long, _
ByVal ncode As Long, _
ByVal wParam As Long, _
lParam As Any) _
As Long
Private Declare Function GetModuleHandle _
Lib "kernel32" _
Alias "GetModuleHandleA" ( _
ByVal lpModuleName As String) _
As Long
Private Declare Function SetWindowsHookEx _
Lib "user32" _
Alias "SetWindowsHookExA" ( _
ByVal idHook As Long, _
ByVal lpfn As Long, _
ByVal hmod As Long, _
ByVal dwThreadId As Long) _
As Long
Private Declare Function UnhookWindowsHookEx _
Lib "user32" ( _
ByVal hHook As Long) _
As Long
Private Declare Function SendDlgItemMessage _
Lib "user32" Alias "SendDlgItemMessageA" ( _
ByVal hDlg As Long, _
ByVal nIDDlgItem As Long, _
ByVal wMsg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) _
As Long
Private Declare Function GetClassName _
Lib "user32" _
Alias "GetClassNameA" ( _
ByVal hWnd As Long, _
ByVal lpClassName As String, _
ByVal nMaxCount As Long) _
As Long
Private Declare Function GetCurrentThreadId _
Lib "kernel32" () _
As Long
''Constants to be used in our API functions
Private Const EM_SETPASSWORDCHAR = &HCC
Private Const WH_CBT = 5
Private Const HCBT_ACTIVATE = 5
Private Const HC_ACTION = 0
Private hHook As Long
Public Function NewProc(ByVal lngCode As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
Dim RetVal
Dim strClassName As String, lngBuffer As Long
If lngCode < HC_ACTION Then
NewProc = CallNextHookEx(hHook, lngCode, wParam, lParam)
Exit Function
End If
strClassName = String$(256, " ")
lngBuffer = 255
If lngCode = HCBT_ACTIVATE Then ''A window has been activated
RetVal = GetClassName(wParam, strClassName, lngBuffer)
If Left$(strClassName, RetVal) = "#32770" Then ''Class name of the Inputbox
''This changes the edit control so that it display the password character *.
''You can change the Asc("*") as you please.
SendDlgItemMessage wParam, &H1324, EM_SETPASSWORDCHAR, Asc("*"), &H0
End If
End If
''This line will ensure that any other hooks that may be in place are
''called correctly.
CallNextHookEx hHook, lngCode, wParam, lParam
End Function
''// Make it public = avail to ALL Modules
''// Lets simulate the VBA Input Function
Public Function InputBoxDK(Prompt As String, Optional Title As String, _
Optional Default As String, _
Optional Xpos As Long, _
Optional Ypos As Long, _
Optional Helpfile As String, _
Optional Context As Long) As String
Dim lngModHwnd As Long, lngThreadID As Long
''// Lets handle any Errors JIC! due to HookProc> App hang!
On Error Goto ExitProperly
lngThreadID = GetCurrentThreadId
lngModHwnd = GetModuleHandle(vbNullString)
hHook = SetWindowsHookEx(WH_CBT, AddressOf NewProc, lngModHwnd, lngThreadID)
If Xpos Then
InputBoxDK = InputBox(Prompt, Title, Default, Xpos, Ypos, Helpfile, Context)
Else
InputBoxDK = InputBox(Prompt, Title, Default, , , Helpfile, Context)
End If
ExitProperly:
UnhookWindowsHookEx hHook
End Function 

Answer 1

el InputBox estándar devuelve campos vacíos y cancela de la misma manera

No, no lo hace. Devuelve un puntero nulo en cancelar y una cadena vacía para la entrada vacía.

Dim s As String
s = InputBox("Test")
If StrPtr(s) = 0 Then
''Cancel pressed
Else
''Ok pressed
End If

Debido a que InputBoxDK devuelve el InputBox del InputBox sin cambios, se aplica la misma lógica.