OnPreSetValueKey event/delegate/callback


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CBFSRegistry     See also    


This callback is called before the request to set a value entry for a key is processed by the system code which deals with the registry.


    property OnPreSetValueKey : TCbRegPreSetValueKeyEvent;
    TCbRegPreSetValueKeyEvent = procedure( Sender : TObject; UserContext: pointer; ValueName: TCBString; ValueData: TCbRegInformation; var Processed: boolean; var CallPostCallback: boolean; var StopFiltering : boolean ) of object;

[C++ (Lib)]
    typedef void (*CbRegPreSetValueKeyEvent)( CBFSRegistry* Sender, LPVOID UserContext, LPCWSTR ValueName, CbRegInformation *ValueData, BOOL * Processed, BOOL * CallPostCallback, BOOL * StopFiltering );

[C++ (VCL)]
    typedef void __fastcall (__closure *TCbRegPreSetValueKeyEvent)( System::TObject* Sender, void *UserContext, TCBString ValueName, TCbRegInformation *ValueData, bool &Processed, bool &CallPostCallback, bool &StopFiltering );

[C++ (.NET)]
    public delegate void CbRegPreSetValueKeyEvent( CBFSRegistry^ Sender, Object^ UserContext, String^ ValueName, CbRegInformation ^ValueData, bool %Processed, bool %CallPostCallback, bool %StopFiltering );

    delegate void CbRegPreSetValueKeyEvent( CBFSRegistry Sender, Object UserContext, String ValueName, CbRegInformation ValueData, ref bool Processed, ref bool CallPostCallback, ref bool StopFiltering );

    Delegate Sub CbRegPreSetValueKeyEvent( ByVal Sender As CBFSRegistry, ByVal UserContext As Object, ByVal ValueName As String, ByVal ValueData As CbRegInformation, ByRef Processed As Boolean, ByRef CallPostCallback As Boolean, ByRef StopFiltering As Boolean )


  • Sender - reference to the class that called the delegate/event handler
  • UserContext - the placeholder for the application-defined data
  • ValueName - the name of the value being queried
  • ValueData - the object that contains information being returned to the system
  • Processed - if it's set to TRUE then the request doesn't go further (to the registry manager). Default value is FALSE.
  • CallPostCallback - if it's set then the post-processing callback will be called. By default it's TRUE. This parameter doesn't matter when StopFiltering or Processed is set or non-successful result is returned.
  • StopFiltering - if StopFiltering is set to true, no other callbacks for the created key handle will be called

Values of KeySetValueClass


This callback/event is called before a request to set a value entry for a key is processed by the registry manager in Windows. The name of the key should be obtained from the user context which must have been set in OnPreOpenKey/OnPreOpenKey callback/event handlers.
Read more about contexts.

Error handling

See Error handling topic for detailed information about how to report errors, which occur in the event handlers, back to CBFSRegistry.

See also

OnPostSetValueKey     OnPreCreateKey     OnPreOpenKey