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8.0

Objects and Object references

Asked by davelane in Delphi Programming, Delphi Components

Ok, being a relative newcomer to Delph, I am only now getting to grips with the down-and-dirty of the language. My question is about the Object Reference model of Delphi. I understand that an object variable is only a refernce to the object that Delphi automatically derefences when accessed. My question is regarding dangling pointers.

I have a hundred different object references (to the same object) scattered throughout my program and perhaps libraries, for example on the Data properties of ListItems and all Treeview nodes etc. Now say I FreeAndNil one of the object reference and want to update the various lists or treeviews. Is there any way to check that the object that an object reference points to has been freed. I was under the impression that assigned() did this, but now I see that it only checks if the reference is nil.

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20100204-EE-VQP-115

Objects and Object references

Asked by davelane in Delphi Programming, Delphi Components

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