Control registry operations in Windows and .NET applications

OnPostQueryKey event/delegate/callback


Pascal    C++ (Lib)    C++ (VCL)    C++ (.NET)    C#    VB.NET   

CallbackRegistry     See also    


This callback is called after the request for key data has been processed by the system code which deals with the registry.


    property OnPostQueryKey : TCbRegPostQueryKeyEvent;
    TCbRegPostQueryKeyEvent = procedure( Sender : TObject; UserContext: pointer; Result: LongWord; KeyInformationClass: KEY_INFORMATION_CLASS; KeyInformation: TCbRegInformation; var StopFiltering : boolean ) of object;

[C++ (Lib)]
    typedef void (*CbRegPostQueryKeyEvent)( CallbackRegistry* Sender, LPVOID UserContext, DWORD Result, KEY_INFORMATION_CLASS KeyInformationClass, CbRegInformation *KeyInformation, BOOL * StopFiltering );

[C++ (VCL)]
    typedef void __fastcall (__closure *TCbRegPostQueryKeyEvent)( System::TObject* Sender, void *UserContext, unsigned Result, Cbregapi::_KEY_INFORMATION_CLASS KeyInformationClass, TCbRegInformation *KeyInformation, bool &StopFiltering );

[C++ (.NET)]
    public delegate void CbRegPostQueryKeyEvent( CallbackRegistry^ Sender, Object^ UserContext, UInt32 Result, CbReg::KEY_INFORMATION_CLASS KeyInformationClass, CbRegInformation^ KeyInformation, bool %StopFiltering );

    delegate void CbRegPostQueryKeyEvent( CallbackRegistry Sender, Object UserContext, UInt32 Result, CbReg.KEY_INFORMATION_CLASS KeyInformationClass, CbRegInformation KeyInformation, ref bool StopFiltering );

    Delegate Sub CbRegPostQueryKeyEvent( ByVal Sender As CallbackRegistry, ByVal UserContext As Object, ByVal Result As UInt32, ByVal KeyInformationClass As CbReg.KEY_INFORMATION_CLASS, ByVal KeyInformation As CbRegInformation, ByRef StopFiltering As Boolean )


  • Sender - reference to the class that called the delegate/event handler
  • UserContext - the placeholder for the application-defined data
  • Result - win32 error value of the operation. This value is returned to the originator of the request in the case no other result is returned from the callback.
  • KeyInformationClass - the value that indicates the type of information to be returned by the system in the KeyInformation object
  • KeyInformation - the object that contains information being returned to the system
  • StopFiltering - if StopFiltering is set to true, no other callbacks for the created key handle will be called

Values of KeyInformationClass


This callback/event is called after a query for key data 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 CallbackRegistry.

See also

OnPreCreateKey     OnPreOpenKey     OnPreQueryKey    

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