Components TLogMsg and TLogMsgHandler tracks use of SCADA application.

 

TLogMsg, palette SmartSCADA System, unit LogMsg.pas

 

      Component that holds data to which part of application is to be access.

 

PROPERTIES

 

Enabled: boolean

Enables or disables component.

 

IniFile: TIniComponent

Pointer to INI file that holds message text. This means that message text can be change externally, without of source code changing.

 

LogMessage: string

Message text that.

 

LogStatus: TLogStatus

This property determines behavior of component.

 

Value	Description
lsNone	Component is idle
lsStart	Sends message on form (application) start.
lsClose	Sends message on form (application) closing.
lsStartClose	Sends message on form (application) start and closing..

 

METHODS

 

procedure Save; virtual;

this method is called to save message text to  database. To execute this method, it is necessary that application has  LogMsgHandler  component that will handle message.

 

TLogMsgHandler, palette SmartSCADA System, unit LogMsg.pas

 

        Component that handles messages that TLogMsg type components send. Application can has only one object of this type.

Component is inherited from TTable. Additional properties of this component are:

Automatic table creating if it not exists.

Fixed table size

 

PROPERTIES

AppClosed: string

Message that will be written to database when application is closed.

 

AppStarted: string

Message that will be written to database when application is started.

 

EnabledMaxNumRecords: Boolean

Determines if database will have fixed size or not.

 

MaxNumRecords: longint

Defines the size of database (number of records).

 

FillTable: boolean

When change this property in design time, database will be filled to defined size. After that, property is reset to false. This is introduced to escape fragmentation of database.

 

Operator: TOperator

Pointer to TOperator object.