topic Re: Trying to read modifing item in ObjectARX Forum

Trying to read modifing item

Anonymous — Mon, 18 Jan 2016 13:06:29 GMT

Hi, let's say that I select all the entities in the drawing (CTRL + A). And then move them to new position. I, of course, get objectModified reactor, and now my question starts.

I get in objectModified a line. And now, I have to check some data from other entity. But I cannot open the other entity, because I get "eWasOpenedForWrite" error.

So, how should I do this properly?

Re: Trying to read modifing item

wispoxy — Mon, 18 Jan 2016 14:12:18 GMT

Remove all reactors with (vlr-remove-all)

Re: Trying to read modifing item

Anonymous — Mon, 18 Jan 2016 14:49:28 GMT

How should that help? I need those reactors.

Re: Trying to read modifing item

wispoxy — Mon, 18 Jan 2016 14:55:41 GMT

If you want them, never mind then. 😐

Re: Trying to read modifing item

dgorsman — Mon, 18 Jan 2016 22:07:55 GMT

You need to be careful with assumptions during event handling. Just because one event is being handled, doesn't mean other object are finished being modified.

There's a short list of guidelines in the ARX development guide. In short:

Do not rely on the sequence of notification firing
Do not rely on the sequence of operations (function calls) between notifications.
Do not use any user interaction functions in your notification callback function

Re: Trying to read modifing item

Anonymous — Tue, 19 Jan 2016 10:26:23 GMT

OK, so how should I do it properly? When an item is under modification (objectModified is fired) I need to know some data from some other item, that can be modified to. So how should I do it properly?

Re: Trying to read modifing item

tbrammer — Tue, 19 Jan 2016 11:03:06 GMT

Could it be that this other entity (that ist open for write) was opened by yourself?

In that case you should check whether it is required to have it open for write. Maybe you can close it before you modify the other entity.

Or if you have access to the entity-pointer you could also use it directly.

Another approach is just to store the ObjectId of the modified object somewhere in your docdata and perform your action later - i.e. in commandEnded() or whatever makes sense to you.