Re: Odd Crash when adding table columns manually
Re: Odd Crash when adding table columns manually
- Subject: Re: Odd Crash when adding table columns manually
- From: Keary Suska <email@hidden>
- Date: Wed, 12 Jan 2011 07:52:36 -0700
On Jan 11, 2011, at 5:49 PM, Eric Gorr wrote:
> I do release them after adding them to the table. It will still crash...
I cannot reproduce the crash with your test project. Have you verified, using zombies, that in fact it is a table column crashing? It might have to do with an invalid data source object...
> On Jan 11, 2011, at 7:29 PM, Peter Lübke <email@hidden> wrote:
>
>> Table columns are retained by the table view they are added to.
>>
>> So you can safely release or autorelease the table column right after invoking -addTableColumn: .
>> The table view owns its columns and will release them when it itself is released.
>>
>> This is the normal behaviour when adding subviews to an NSView or its subclasses.
>>
>> Peter
>>
>>
>> Am 11.01.2011 um 18:06 schrieb Eric Gorr:
>>
>>> I've got a sample test project at:
>>>
>>> http://ericgorr.net/cocoadev/TableColumnTest.zip
>>>
>>> which reproduces the strange crash.
>>>
>>> I have a NSTableView to which I need to add NSTableColumns manually using the addTableColumn: method. The problem is that for some reason when I release the window and everything is being deallocated, someone has an extra retain on the table column and it sticks around. This causes a crash because the OS tries to redraw the table which really isn't there.
>>>
>>> Note: With the code as written, it will only cause a crash sometimes...if you comment back in the call to the EventAvail function in WindowTestAppDelegate.m, it will crash every time...this is how I ended up finding the odd behavior to begin with - I am working with a cocoa/carbon app and EventAvail is still being called.
>>>
>>> I can avoid the crash if, in my TableController class, I manually remove the table column from the table first. Is this what I am expected to do if I manually add the column? I would not have thought so, but perhaps I am wrong...?
>>>
>>> In TableController.m, I have the function GetNewColumn which creates a new table column. After I alloc and init the column, I can log the retain count of the column and see that it is 1. After I call setWidth: on the table column, I can see that the retain count is 2.
>>>
>>> Can anyone shed some light on what might be going on here and why it is crashing?
>>>
>>> (if it matters, I am still running on 10.6.5)
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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