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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Apr 8, 2000

SetRegistryValue - Write a value in the Registry

Private Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" _
    (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, _
    ByVal samDesired As Long, phkResult As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As _
    Long
Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias _
    "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, _
    ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, _
    ByVal cbData As Long) As Long

Const KEY_WRITE = &H20006  '((STANDARD_RIGHTS_WRITE Or KEY_SET_VALUE Or 
                           ' KEY_CREATE_SUB_KEY) And (Not SYNCHRONIZE))
Const REG_SZ = 1
Const REG_BINARY = 3
Const REG_DWORD = 4

' Write or Create a Registry value
' returns True if successful
'
' Use KeyName = "" for the default value
'
' Value can be an integer value (REG_DWORD), a string (REG_SZ)
' or an array of binary (REG_BINARY). Raises an error otherwise.

Function SetRegistryValue(ByVal hKey As Long, ByVal KeyName As String, _
    ByVal ValueName As String, value As Variant) As Boolean
    Dim handle As Long
    Dim lngValue As Long
    Dim strValue As String
    Dim binValue() As Byte
    Dim length As Long
    Dim retVal As Long
    
    ' Open the key, exit if not found
    If RegOpenKeyEx(hKey, KeyName, 0, KEY_WRITE, handle) Then
        Exit Function
    End If

    ' three cases, according to the data type in Value    
    Select Case VarType(value)
        Case vbInteger, vbLong
            lngValue = value
            retVal = RegSetValueEx(handle, ValueName, 0, REG_DWORD, lngValue, 4)
        Case vbString
            strValue = value
            retVal = RegSetValueEx(handle, ValueName, 0, REG_SZ, ByVal strValue, _
                Len(strValue))
        Case vbArray + vbByte
            binValue = value
            length = UBound(binValue) - LBound(binValue) + 1
            retVal = RegSetValueEx(handle, ValueName, 0, REG_BINARY, _
                binValue(LBound(binValue)), length)
        Case Else
            RegCloseKey handle
            Err.Raise 1001, , "Unsupported value type"
    End Select
    
    ' Close the key and signal success
    RegCloseKey handle
    ' signal success if the value was written correctly
    SetRegistryValue = (retVal = 0)
End Function
Francesco Balena
 
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