Excel – Error-1004 in Excel VBA- Unable to set the visible property of the worksheet class

excelvba

With the help of Excel forum, I have created a user login form where I have 5 users. Each user can have access to the sheets assigned to him/her only. This is working fine. But now I have protected the "workbook structure" so as to avoid users' adding/deleting sheets. Then I login again, and instead of displaying the login form, the error message pops up in Excel VBA:

Error-1004 Unable to set the visible property of the worksheet class

When I debug the error is highlighted in the following codes where the visible property of the worksheet is set as "True", "False" or "xlSheetVeryHidden".

Private Sub Workbook_Open()
    Dim wsSht As Worksheet

    Worksheets("Splash").Visible = True
    Worksheets("Users").Visible = False
    For Each wsSht In Worksheets
        If Not wsSht.Name = "Splash" Then wsSht.Visible = xlSheetVeryHidden
    Next wsSht
    With Worksheets("Splash")
        .Visible = True
        .Activate
    End With
    frmLogin.Show
    bBkIsClose = False

End Sub

Is there a way to correct this so as I can access the login form as I did prior to password protecting the "workbook structure"?

Best Answer

Here is another concern about this.

You can NOT hide ALL of the worksheets in a workbook. As such if you know you are going to have at least 1 sheet that will ALWAYS be visible, exclude it from the hiding process.

How it works

I will try my best to explain how it works - please excuse my English.

The VBE will call a system function to create the password dialog box.
If user enters the right password and click OK, this function returns 1. If user enters the wrong password or click Cancel, this function returns 0.
After the dialog box is closed, the VBE checks the returned value of the system function
if this value is 1, the VBE will "think" that the password is right, hence the locked VBA project will be opened.
The code below swaps the memory of the original function used to display the password dialog with a user defined function that will always return 1 when being called.

Using the code

Please backup your files first!

Open the file(s) that contain your locked VBA Projects

Create a new xlsm file and store this code in Module1

code credited to Siwtom (nick name), a Vietnamese developer

Option Explicit

Private Const PAGE_EXECUTE_READWRITE = &H40

Private Declare Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" _
        (Destination As Long, Source As Long, ByVal Length As Long)

Private Declare Function VirtualProtect Lib "kernel32" (lpAddress As Long, _
        ByVal dwSize As Long, ByVal flNewProtect As Long, lpflOldProtect As Long) As Long

Private Declare Function GetModuleHandleA Lib "kernel32" (ByVal lpModuleName As String) As Long

Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long, _
        ByVal lpProcName As String) As Long

Private Declare Function DialogBoxParam Lib "user32" Alias "DialogBoxParamA" (ByVal hInstance As Long, _
        ByVal pTemplateName As Long, ByVal hWndParent As Long, _
        ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Integer

Dim HookBytes(0 To 5) As Byte
Dim OriginBytes(0 To 5) As Byte
Dim pFunc As Long
Dim Flag As Boolean

Private Function GetPtr(ByVal Value As Long) As Long
    GetPtr = Value
End Function

Public Sub RecoverBytes()
    If Flag Then MoveMemory ByVal pFunc, ByVal VarPtr(OriginBytes(0)), 6
End Sub

Public Function Hook() As Boolean
    Dim TmpBytes(0 To 5) As Byte
    Dim p As Long
    Dim OriginProtect As Long

    Hook = False

    pFunc = GetProcAddress(GetModuleHandleA("user32.dll"), "DialogBoxParamA")


    If VirtualProtect(ByVal pFunc, 6, PAGE_EXECUTE_READWRITE, OriginProtect) <> 0 Then

        MoveMemory ByVal VarPtr(TmpBytes(0)), ByVal pFunc, 6
        If TmpBytes(0) <> &H68 Then

            MoveMemory ByVal VarPtr(OriginBytes(0)), ByVal pFunc, 6

            p = GetPtr(AddressOf MyDialogBoxParam)

            HookBytes(0) = &H68
            MoveMemory ByVal VarPtr(HookBytes(1)), ByVal VarPtr(p), 4
            HookBytes(5) = &HC3

            MoveMemory ByVal pFunc, ByVal VarPtr(HookBytes(0)), 6
            Flag = True
            Hook = True
        End If
    End If
End Function

Private Function MyDialogBoxParam(ByVal hInstance As Long, _
        ByVal pTemplateName As Long, ByVal hWndParent As Long, _
        ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Integer
    If pTemplateName = 4070 Then
        MyDialogBoxParam = 1
    Else
        RecoverBytes
        MyDialogBoxParam = DialogBoxParam(hInstance, pTemplateName, _
                           hWndParent, lpDialogFunc, dwInitParam)
        Hook
    End If
End Function

Paste this code under the above code in Module1 and run it

Sub unprotected()
    If Hook Then
        MsgBox "VBA Project is unprotected!", vbInformation, "*****"
    End If
End Sub

Come back to your VBA Projects and enjoy.

Excel – Select worksheet in Excel add-in to run VBA macro

I just realized that I had to use "ThisWorkbook" in the add-in VBA code.

Set ws1 = ThisWorkbook.Sheets ("Sheet1")

VBA code within a workbook should use "ThisWorkbook" to reference to sheets or ranges inside the add-in.

Best Answer

Related Solutions

Excel – way to crack the password on an Excel VBA Project

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Excel – Select worksheet in Excel add-in to run VBA macro

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