Re: simplest way to trap error in lua?
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- Subject: Re: simplest way to trap error in lua?
- From: "Matthew Armstrong" <turkeypotpie@...>
- Date: 2007年1月24日 22:00:25 -0800
Cool, thank you so much.
The response time on this mailing list is insane :P
On 1/24/07, Rici Lake <lua@ricilake.net
> wrote:
On 25-Jan-07, at 12:22 AM, Matthew Armstrong wrote:
> Giving a simple example:
>
> function f1()
> local ohNoImNil = nil
> ohNoImNil()
> end
>
> function f2()
> f1()
> end
>
> f2()
>
> What's the easiest way to trap the nil call and dump the stack?
>
> easiest within lua?
> function f1()
>> local ohNoImNil = nil
>> ohNoImNil()
>> end
>
> function f2()
>> f1()
>> end
>
> ok, err = xpcall(f2, debug.traceback)
> =ok
false
> =err
stdin:3: attempt to call local 'ohNoImNil' (a nil value)
stack traceback:
stdin:3: in function 'f1'
stdin:2: in function <stdin:1>
[C]: in function 'xpcall'
stdin:1: in main chunk
[C]: ?
> easiest within c?
lua_pcall(), having put debug.traceback
on the stack somewhere and
providing it's index as the fourth argument.