Re: NSGraphicsContext restore crashes my xtension
Re: NSGraphicsContext restore crashes my xtension
- Subject: Re: NSGraphicsContext restore crashes my xtension
- From: "Ken Ferry" <email@hidden>
- Date: Sun, 27 Jul 2008 23:42:22 -0700
Graham's suggestion is also better because -[NSGraphicsContext
setCurrentContext:] just releases the context that was previously
current, as opposed to autoreleasing it.
So this has a bug:
NSGraphicsContext *originalContext = [NSGraphicsContext currentContext];
[NSGraphicsContext setCurrentContext:newContext]; // bad!
originalContext may get deallocated here
// do stuff
[NSGraphicsContext setCurrentContext:originalContext];
-Ken
On Sun, Jul 27, 2008 at 9:02 PM, Graham Cox <email@hidden> wrote:
>
> On 28 Jul 2008, at 11:05 am, Ken Tozier wrote:
>>
>> Saving/restoring the context with
>>
>> *oldContext = [NSGraphicsContext currentContext];
>>
>> [NSGraphicsContext setCurrentContext: oldContext];
>>
>> Did the trick. No more crashes.
>
>
> Since this is such a common thing to need to do, it's usually more
> convenient to just put:
>
> [NSGraphicContext saveGraphicsState];
>
> at the top of your code and
>
> [NSGraphicsContext restoreGraphicsState];
>
> at the bottom.
>
>
>
> Graham
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