[VB6] How Do I Work With The Registry?
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Thread: [VB6] How Do I Work With The Registry?

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    [VB6] How Do I Work With The Registry?

    Q: How Do I Save A Value In The Default VB 6 Registry Key?

    A: By Using SaveSetting, Your Application Saves Whatever Value Into The HKEY_CURRENT_USER\Software\VB and VBA Program Settings Key :

    Code:
    Private Sub cmdSave_Click()
    
        SaveSetting App.Title, "Form Location", "Left", "250" 'Store Left Value
        SaveSetting App.Title, "Form Location", "Top", "300" 'Store Top Value
        
    End Sub
    Q: How Do I Retrieve A Value From The Above Location?

    A: GetSetting And GetAllSettings Retrieves Values From The HKEY_CURRENT_USER\Software\VB and VBA Program Settings Key?

    Code:
    Private Sub cmdGet_Click()
        Dim strTop As String 'Variable to hold value returned from the Registry
        Dim strLeft As String 'Variable to hold value returned from Registry
    
        strLeft = GetSetting(App.Title, "Form Location", "Left") 'Read Left value stored
        strTop = GetSetting(App.Title, "Form Location", "Top") 'Read Top value stored
    
        frmRegistry.Left = CInt(strLeft) 'Convert the string read from the Registry to an Integer value
        frmRegistry.Top = CInt(strTop)
        
    End Sub
    
    Private Sub cmdGetAll_Click()
    
        Dim arrAllSettings As Variant 'Variable to store 2 dimensional array of values read from Registry
    
        arrAllSettings = GetAllSettings(App.Title, "Form Location") 'Retrieve Registry values stored under Form Location
    
    
        txtGetAllSettings.Text = arrAllSettings(0, 0) & " = " & arrAllSettings(0, 1) & vbCrLf 'Display the first key and first value under Form Location (Left)
        txtGetAllSettings.Text = txtGetAllSettings.Text & arrAllSettings(1, 0) & " = " & arrAllSettings(1, 1) 'Display the second key and second value under Form Location (Top)
    
    End Sub
    Q: What If I Want To Save And Retrieve Registry Values For My Program At Another Place In The Registry?

    A: Use The Registry APIs :

    Code:
       Private Const REG_SZ As Long = 1 'REG_SZ represents a fixed-length text string.
       Private Const REG_DWORD As Long = 4 'REG_DWORD represents data by a number that is 4 bytes long.
    
       Private Const HKEY_CLASSES_ROOT = &H80000000 'The information stored here ensures that the correct program opens when you open a file by using Windows Explorer.
       Private Const HKEY_CURRENT_USER = &H80000001 'Contains the root of the configuration information for the user who is currently logged on.
       Private Const HKEY_LOCAL_MACHINE = &H80000002 'Contains configuration information particular to the computer (for any user).
       Private Const HKEY_USERS = &H80000003 'Contains the root of all user profiles on the computer.
    
       'Return values for all registry functions
       Private Const ERROR_SUCCESS = 0
       Private Const ERROR_NONE = 0
    
       Private Const KEY_QUERY_VALUE = &H1 'Required to query the values of a registry key.
       Private Const KEY_ALL_ACCESS = &H3F 'Combines the STANDARD_RIGHTS_REQUIRED, KEY_QUERY_VALUE, KEY_SET_VALUE, KEY_CREATE_SUB_KEY, KEY_ENUMERATE_SUB_KEYS, KEY_NOTIFY, and KEY_CREATE_LINK access rights.
    
    
    'API Calls for writing to Registry
      'Close Registry Key
       Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
      'Create Registry Key
       Private Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
      'Open Registry Key
       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
      'Query a String Value
       Private Declare Function RegQueryValueExString Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, ByVal lpData As String, lpcbData As Long) As Long
      'Query a Long Value
       Private Declare Function RegQueryValueExLong Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Long, lpcbData As Long) As Long
      'Query a NULL Value
       Private Declare Function RegQueryValueExNULL Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, ByVal lpData As Long, lpcbData As Long) As Long
      'Enumerate Sub Keys
       Private Declare Function RegEnumKey Lib "advapi32.dll" Alias "RegEnumKeyA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpName As String, ByVal cbName As Long) As Long
      'Store a Value
       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
      'Delete Key
       Private Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
    
    Private Sub SaveValue(hKey As Long, strPath As String, strvalue As String, strData As String)
        
       Dim ret
      'Create a new key
       RegCreateKey hKey, strPath, ret
      'Save a string to the key
       RegSetValueEx ret, strvalue, 0, REG_SZ, ByVal strData, Len(strData)
      'close the key
       RegCloseKey ret
        
    End Sub
     
    Private Sub QueryValue(sKeyName As String, sValueName As String)
           
      Dim lRetVal As Long         'result of the API functions
      Dim hKey As Long         'handle of opened key
      Dim vValue As Variant      'setting of queried value
    
      lRetVal = RegOpenKeyEx(HKEY_LOCAL_MACHINE, sKeyName, 0, KEY_QUERY_VALUE, hKey) 'Open Key to Query a value
      lRetVal = QueryValueEx(hKey, sValueName, vValue) 'Query (determine) the value stored
    
      frmRegistry.Caption = vValue 'Set the Form's Caption to whatever text was stored
      RegCloseKey (hKey) 'Close the Key
           
    End Sub
       
    Function QueryValueEx(ByVal lhKey As Long, ByVal szValueName As String, vValue As Variant) As Long
           
           Dim Data As Long
           Dim retval As Long 'Return value of RegQuery functions
           Dim lType As Long 'Determine data type of present data
           Dim lValue As Long 'Long value
           Dim sValue As String 'String value
    
           On Error GoTo QueryValueExError
    
           ' Determine the size and type of data to be read
           retval = RegQueryValueExNULL(lhKey, szValueName, 0&, lType, 0&, Data)
           
           If retval <> ERROR_NONE Then Error 5
    
           Select Case lType
               ' Determine strings
               Case REG_SZ:
                   sValue = String(Data, 0)
    
                   retval = RegQueryValueExString(lhKey, szValueName, 0&, lType, sValue, Data)
                   
                   If retval = ERROR_NONE Then
                       vValue = Left$(sValue, Data - 1)
                   Else
                       vValue = Empty
                   End If
                   
               ' Determine DWORDS
               Case REG_DWORD:
                   retval = RegQueryValueExLong(lhKey, szValueName, 0&, lType, lValue, Data)
                   
                   If retval = ERROR_NONE Then vValue = lValue
               
               Case Else
                   'all other data types not supported
                   retval = -1
           End Select
        
    QueryValueExError:
           QueryValueEx = retval
           Exit Function
    
       End Function
    Private Sub cmdCreateKey_Click()
    
        SaveValue HKEY_LOCAL_MACHINE, "Software\" & App.Title, "Test", "Testing123" 'Call SaveValue Sub to save a value in the Registry
    
    End Sub
    Q: Can I Have An Example Of A Registry Program That Does All Of this?

    A: Have A Look At The Attachment.
    Attached Files Attached Files

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