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Module: Registry in Category Windows : Registry from Total Visual SourceBook

Routines for manipulating the registry (add, edit, delete, enumerate, and find registry keys and values) for VBA with support for 32 and 64 bit Windows API calls

Procedure List

Procedure Name

Type

Description

(Declarations) Declarations Declarations and private variables for the modRegistry module
RegistryCreateNewKey Procedure Create a new key in the system registry using RegCreateKeyEx.
RegistryDeleteKey Procedure Delete a key from the system registry using RegDeleteKey. Note that any subkeys must be deleted first. The API documentation for this function is incorrect. The Microsoft Knowledge Base states: "The documentation for RegDeleteKey() points out that the specified key to be deleted must not have subkeys. If the key to be deleted does have subkeys, RegDeleteKey() will fail with access denied. This happens despite the fact that the machine account has delete privileges and the registry handle passed to RegDeleteKey() was opened with delete access. The additional requirement is that the key must have no subkeys."
RegistryDeleteValue Procedure Delete a value from the system registry using RegOpenKeyEx and RegDeleteValue.
RegistryEnumerateSubKeys Procedure Enumerate the subkeys of the specified key using RegQueryInfoKey and RegEnumKey.
RegistryEnumerateNames Procedure Enumerate the names of the values in a specified key using RegQueryInfoKey and RegEnumValue.
RegistryEnumerateValues Procedure Get the names and values of a specified key using RegQueryInfoKey and RegEnumValue.
RegistryGetKeyValue Procedure Get a value from the system registry using commands like RegQueryValueExNULL, RegQueryValueExString, and RegQueryValueExLong.
RegistryGetKeyValueEitherRoot Procedure Get a value from the system registry by looking in one root (Machine or CurrentUser) and if not found, choosing the other one.
RegistrySetKeyValue Procedure Set a registry key value and creates it if it doesn't already exist using RegCreateKeyEx API call.

Example Code for Using Module: Registry

' Example of modRegistry
'
' To use this example, create a new module and paste this code into it.
' Then run the procedures by putting the cursor in the procedure and pressing:
'    F5 to run it, or
'    F8 to step through it line-by-line (see the Debug menu for more options)

Private Sub Example_modRegistry_Read()
  ' Comments: Example of using the modRegistry module to read values from the Windows Registry with support for VBA with 32 and 64-bit API calls
  '           See registry values in the Immediate Window

  Dim strValue As String
  Dim astrKeys() As String
  Dim astrNames() As String
  Dim avarValues() As Variant
  Dim lngCount As Long
  Dim lngCounter As Long
  Dim eRootKeyFound As EnumRegistryRootKeys
  Dim strHive As String

  ' Get the location of the Windows Program Files
  strValue = RegistryGetKeyValue(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion", "ProgramFilesDir")
  MsgBox "Location of Windows Program Files: " & strValue

  ' Search from either root (starting with User) to see if the value exists
  ' This example shows that after not finding it in the USER root, the value is found in the MACHINE root
  strValue = RegistryGetKeyValueEitherRoot(False, "SOFTWARE\Microsoft\Windows\CurrentVersion", "ProgramFilesDir", eRootKeyFound)
  If Len(strValue) > 0 Then
    If eRootKeyFound = HKEY_LOCAL_MACHINE Then
      strHive = "HKEY_LOCAL_MACHINE"
    ElseIf eRootKeyFound = HKEY_CURRENT_USER Then
      strHive = "HKEY_CURRENT_USER"
    End If
    MsgBox "Location of Windows Program Files: " & strValue & vbCrLf & _
           "Found in registry hive: " & strHive
  End If

  ' This example shows that a name that doesn't exist returns a blank value
  strValue = RegistryGetKeyValue(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion", "NonExistent")
  If Len(strValue) = 0 Then
    MsgBox "Value could not be found"
  End If

  ' Enumerate the subkeys by placing their values into an array, then print the values to the Immediate Window
  Call RegistryEnumerateSubKeys(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Office", astrKeys(), lngCount)
  If lngCount > 0 Then
    Debug.Print "Microsoft Office SubKeys:"
    For lngCounter = 0 To lngCount - 1
      Debug.Print astrKeys(lngCounter)
    Next lngCounter
    Debug.Print
  End If

  ' Get the names in a registry key, then print them to the Immediate Window
  Call RegistryEnumerateNames(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion", astrNames(), lngCount)
  If lngCount > 0 Then
    Debug.Print "Microsoft Windows CurrentVersion Registry Names:"
    For lngCounter = 0 To lngCount - 1
      Debug.Print astrNames(lngCounter)
    Next lngCounter
  End If
  Debug.Print

  ' Get the names and values of a registry subkey, then print them to the Immediate Window
  Call RegistryEnumerateValues(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion", astrNames(), avarValues(), lngCount)
  If lngCount > 0 Then
    Debug.Print "Microsoft Windows CurrentVersion Registry Names and Values:"
    For lngCounter = 0 To lngCount - 1
      Debug.Print astrNames(lngCounter), avarValues(lngCounter)
    Next lngCounter
  End If

End Sub

Private Sub Example_modRegistry_Write()
  ' Comments: Example of using the modRegistry module to create, get and delete values from the Windows Registry with support for VBA with 32 and 64-bit API calls
  '           See values in the Immediate Window

  Const cstrRegKey As String = "Software\FMS\TotalVisualSourceBook\Test"
  Const cstrRegValue As String = "TestValue"

  Dim strResult As String

  ' Creates a new key in the user's registry
  If RegistryCreateNewKey(HKEY_CURRENT_USER, cstrRegKey) Then
    MsgBox cstrRegKey & " successfully created", vbInformation

    ' Modify an existing key by assigning it the value of "SampleData"
    If RegistrySetKeyValue(HKEY_CURRENT_USER, cstrRegKey, cstrRegValue, "SampleData", REG_SZ) Then
      MsgBox cstrRegKey & " successfully set", vbInformation

      ' Get the value we just created
      strResult = RegistryGetKeyValue(HKEY_CURRENT_USER, cstrRegKey, cstrRegValue)
      Debug.Print "Key value: " & strResult & vbCrLf & "Retrieved from registry key: " & cstrRegKey

      ' Delete this value back out
      If RegistryDeleteValue(HKEY_CURRENT_USER, cstrRegKey, cstrRegValue) Then
        ' Now remove the key
        If RegistryDeleteKey(HKEY_CURRENT_USER, cstrRegKey) Then
          MsgBox cstrRegKey & " successfully deleted", vbInformation
        Else
          MsgBox cstrRegKey & " could not be deleted", vbCritical
        End If
      End If
    Else
      MsgBox cstrRegKey & " could not be set", vbCritical
    End If
  Else
    MsgBox cstrRegKey & " could not be created", vbCritical
  End If

End Sub

Microsoft Access Module LibraryOverview of Total Visual SourceBook

The source code in Total Visual SourceBook includes modules and classes for Microsoft Access, Visual Basic 6 (VB6), and Visual Basic for Applications (VBA) developers. Easily add this professionally written, tested, and documented royalty-free code into your applications to simplify your application development efforts.

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