Inputbox com máscara de senha no Office

A Inputbox é a função mais prática para se capturar uma entrada do usuário durante a execução do aplicativo. Seu visual pode não ser lá essas coisas, mas em termos de praticidade é imbatível: com uma ou duas linhas de código, sem necessidade de um formulário, a janela com um textbox e dois botões (OK e Cancel) é exibida ao usuário.

No excelente site http://www.xcelfiles.com há uma função personalizada no VBA, com chamada a APIs, que mostra uma Inputbox com máscara de senha (http://www.xcelfiles.com/API_09.html). A autoria é do MVP inglês Daniel Klann.

Para usar, basta colar este código em um módulo padrão e chamar a função InputboxDK:

'////////////////////////////////////////////////////////////////////
'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
'////////////////////////////////////////////////////////////////////

'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