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deleting a table after attaching an arrow to it (Read 4587 times)

sbailey Junior Member Offline Posts: 61 Location: MD Joined: Apr 24^th, 2009	deleting a table after attaching an arrow to it Jul 15^th, 2009 at 12:39pm	Print Post
	I'm experiencing crashes when deleting tables with DeleteItem( ... ) once they've had arrows attached to them. Even calling BreakRelation doesn't prevent the crash. Is there any cleanup step I might be missing?

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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: deleting a table after attaching an arrow to i Reply #1 - Jul 15^th, 2009 at 12:54pm	Print Post
	Are you handling the TableDeleted and ArrowDeleted events?


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sbailey Junior Member Offline Posts: 61 Location: MD Joined: Apr 24^th, 2009	Re: deleting a table after attaching an arrow to i Reply #2 - Jul 15^th, 2009 at 1:04pm	Print Post
	No -- is there something I should be doing in them? I'm experiencing other strange issues with arrows, though, such as the fact that my table becomes unstable once I've attached an arrow going from it to itself, but not when I've attached an arrow going from it to another table (until I try to delete the table), which means there might be something odd going on in my code, such as reference counts changing and objects being unexpected released...

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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: deleting a table after attaching an arrow to i Reply #3 - Jul 15^th, 2009 at 1:22pm	Print Post
	Are you calling ->Release() on the deleted items after calling DeleteItem? The control is not consistent with COM in this case, and directly deletes the C++ object disregarding the reference count, so you should not call any of the item's members after DeleteItem.


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sbailey Junior Member Offline Posts: 61 Location: MD Joined: Apr 24^th, 2009	Re: deleting a table after attaching an arrow to i Reply #4 - Jul 15^th, 2009 at 1:45pm	Print Post
	No, I'm not doing that, though I can't claim to understand completely what's going on behind the scenes as far as adding and removing references. I'm sure that's where the problem is. It's always the destination table that blows up.

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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: deleting a table after attaching an arrow to i Reply #5 - Jul 15^th, 2009 at 2:59pm	Print Post
	What happens if you save your flowchart to a file, load it in the fcdemo example, and delete a table from the context menu there?


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sbailey Junior Member Offline Posts: 61 Location: MD Joined: Apr 24^th, 2009	Re: deleting a table after attaching an arrow to i Reply #6 - Jul 15^th, 2009 at 3:08pm	Print Post
	That works fine, as does creating the arrow outside of an event handler. What was breaking things was that I was manually setting the arrow's destination inside RequestCreateArrow (dragging over a box = dragging over a certain child table) when I probably should be doing that inside CreateArrow instead or during a post-event cleanup routine. I think I'm okay now.

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