The OnResult event handler is invoked after the server has
processed a command issued by the client. To implement
an event handler, the application should create a class derived from
the CFtpServer class, and then override this method.
To obtain the complete command line, use the GetCommandLine
method, or use the GetCommandParam method to get the value of
specific command parameters. If the application requires the text
message that was sent to the client along with the result code, use
the GetCommandResult method.