解除excel單元格保護

出處見代碼原作者注釋部分。

圖解

很久(2018年左右)之前做的圖了，講究看吧。

代碼

Public Sub AllInternalPasswords()
  ' Breaks worksheet and workbook structure passwords. Bob McCormick
  ' probably originator of base code algorithm modified for coverage
  ' of workbook structure / windows passwords and for multiple passwords
  '
  ' Norman Harker and JE McGimpsey 27-Dec-2002 (Version 1.1)
  ' Modified 2003-Apr-04 by JEM: All msgs to constants, and
  '  eliminate one Exit Sub (Version 1.1.1)
  ' Reveals hashed passwords NOT original passwords
  Const DBLSPACE As String = vbNewLine & vbNewLine
  Const AUTHORS As String = DBLSPACE & vbNewLine & _
      "Adapted from Bob McCormick base code by " & _
      "Norman Harker and JE McGimpsey"
  Const HEADER As String = "AllInternalPasswords User Message"
  Const VERSION As String = DBLSPACE & "Version 1.1.1 2003-Apr-04"
  Const REPBACK As String = DBLSPACE & "Please report failure " & _
      "to the microsoft.public.excel.programming newsgroup."
  Const ALLCLEAR As String = DBLSPACE & "The workbook should " & _
      "now be free of all password protection, so make sure you:" & _
      DBLSPACE & "SAVE IT NOW!" & DBLSPACE & "and also" & _
      DBLSPACE & "BACKUP!, BACKUP!!, BACKUP!!!" & _
      DBLSPACE & "Also, remember that the password was " & _
      "put there for a reason. Don't stuff up crucial formulas " & _
      "or data." & DBLSPACE & "Access and use of some data " & _
      "may be an offense. If in doubt, don't."
  Const MSGNOPWORDS1 As String = "There were no passwords on " & _
      "sheets, or workbook structure or windows." & AUTHORS & VERSION
  Const MSGNOPWORDS2 As String = "There was no protection to " & _
      "workbook structure or windows." & DBLSPACE & _
      "Proceeding to unprotect sheets." & AUTHORS & VERSION
  Const MSGTAKETIME As String = "After pressing OK button this " & _
      "will take some time." & DBLSPACE & "Amount of time " & _
      "depends on how many different passwords, the " & _
      "passwords, and your computer's specification." & DBLSPACE & _
      "Just be patient! Make me a coffee!" & AUTHORS & VERSION
  Const MSGPWORDFOUND1 As String = "You had a Worksheet " & _
      "Structure or Windows Password set." & DBLSPACE & _
      "The password found was: " & DBLSPACE & "$$" & DBLSPACE & _
      "Note it down for potential future use in other workbooks by " & _
      "the same person who set this password." & DBLSPACE & _
      "Now to check and clear other passwords." & AUTHORS & VERSION
  Const MSGPWORDFOUND2 As String = "You had a Worksheet " & _
      "password set." & DBLSPACE & "The password found was: " & _
      DBLSPACE & "$$" & DBLSPACE & "Note it down for potential " & _
      "future use in other workbooks by same person who " & _
      "set this password." & DBLSPACE & "Now to check and clear " & _
      "other passwords." & AUTHORS & VERSION
  Const MSGONLYONE As String = "Only structure / windows " & _
       "protected with the password that was just found." & _
       ALLCLEAR & AUTHORS & VERSION & REPBACK
  Dim w1 As Worksheet, w2 As Worksheet
  Dim i As Integer, j As Integer, k As Integer, l As Integer
  Dim m As Integer, n As Integer, i1 As Integer, i2 As Integer
  Dim i3 As Integer, i4 As Integer, i5 As Integer, i6 As Integer
  Dim PWord1 As String
  Dim ShTag As Boolean, WinTag As Boolean
  
  Application.ScreenUpdating = False
  With ActiveWorkbook
    WinTag = .ProtectStructure Or .ProtectWindows
  End With
  ShTag = False
  For Each w1 In Worksheets
      ShTag = ShTag Or w1.ProtectContents
  Next w1
  If Not ShTag And Not WinTag Then
    MsgBox MSGNOPWORDS1, vbInformation, HEADER
    Exit Sub
  End If
  MsgBox MSGTAKETIME, vbInformation, HEADER
  If Not WinTag Then
    MsgBox MSGNOPWORDS2, vbInformation, HEADER
  Else
   On Error Resume Next
   Do   'dummy do loop
    For i = 65 To 66: For j = 65 To 66: For k = 65 To 66
    For l = 65 To 66: For m = 65 To 66: For i1 = 65 To 66
    For i2 = 65 To 66: For i3 = 65 To 66: For i4 = 65 To 66
    For i5 = 65 To 66: For i6 = 65 To 66: For n = 32 To 126
    With ActiveWorkbook
     .Unprotect Chr(i) & Chr(j) & Chr(k) & _
       Chr(l) & Chr(m) & Chr(i1) & Chr(i2) & _
       Chr(i3) & Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
     If .ProtectStructure = False And _
     .ProtectWindows = False Then
       PWord1 = Chr(i) & Chr(j) & Chr(k) & Chr(l) & _
        Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & _
        Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
       MsgBox Application.Substitute(MSGPWORDFOUND1, _
          "$$", PWord1), vbInformation, HEADER
       Exit Do 'Bypass all for...nexts
     End If
    End With
    Next: Next: Next: Next: Next: Next
    Next: Next: Next: Next: Next: Next
   Loop Until True
   On Error GoTo 0
  End If
  If WinTag And Not ShTag Then
   MsgBox MSGONLYONE, vbInformation, HEADER
   Exit Sub
  End If
  On Error Resume Next
  For Each w1 In Worksheets
   'Attempt clearance with PWord1
   w1.Unprotect PWord1
  Next w1
  On Error GoTo 0
  ShTag = False
  For Each w1 In Worksheets
   'Checks for all clear ShTag triggered to 1 if not.
   ShTag = ShTag Or w1.ProtectContents
  Next w1
  If ShTag Then
    For Each w1 In Worksheets
     With w1
      If .ProtectContents Then
       On Error Resume Next
       Do   'Dummy do loop
        For i = 65 To 66: For j = 65 To 66: For k = 65 To 66
        For l = 65 To 66: For m = 65 To 66: For i1 = 65 To 66
        For i2 = 65 To 66: For i3 = 65 To 66: For i4 = 65 To 66
        For i5 = 65 To 66: For i6 = 65 To 66: For n = 32 To 126
        .Unprotect Chr(i) & Chr(j) & Chr(k) & _
         Chr(l) & Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & _
         Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
        If Not .ProtectContents Then
         PWord1 = Chr(i) & Chr(j) & Chr(k) & Chr(l) & _
          Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & _
          Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
         MsgBox Application.Substitute(MSGPWORDFOUND2, _
            "$$", PWord1), vbInformation, HEADER
         'leverage finding Pword by trying on other sheets
         For Each w2 In Worksheets
          w2.Unprotect PWord1
         Next w2
         Exit Do 'Bypass all for...nexts
        End If
        Next: Next: Next: Next: Next: Next
        Next: Next: Next: Next: Next: Next
       Loop Until True
       On Error GoTo 0
      End If
     End With
    Next w1
  End If
  MsgBox ALLCLEAR & AUTHORS & VERSION & REPBACK, vbInformation, HEADER
End Sub