DBBaseContext :: doBeforeModify - Modify handler
The before modify handler is called, when a property or instance data has been modified (DBP_Modify event). Since modify events on the instance level are fired, whenever an attribute changes, it is usually not suggested to handle modify events in a type context. This can be handled in a better way in the TypeContext::doBeforeStore() handler.
When updating an instance directly without using property handle assignments, you should call the modify() function to signal the modify events.
Return value: Execution error ( int32 )
The value is usually returned from context functions or actions in order to report the result of execution. The variable may contain following values:
- -1: function/action not executed
- 0: function executed normally
- 1-9: Function executed with errors. Error codes depend on the function/action called.
Implementation details
int32
DBBaseContext :: doBeforeModify ( )
The handler can be overloaded in specialized type context class implemented in an application.