[Haskell-cafe] Error Calling Lua Function

[aditya siram]

That worked. Thank you!
-deech

On Sat, Oct 23, 2010 at 1:49 PM, Claude Heiland-Allen <
claudiusmaximus at goto10.org> wrote:

> Hi Aditya,
>
> The problem is not that the file was not loaded, but that in Lua, loading a
> file only loads it and does not execute it; Lua is a "dynamic" language, by
> which I mean that definitions are created through execution.
>
> Attached is a simple example, note that there is no proper error checking -
> you probably want to check the results rather than pattern matching against
> constants.
>
> Thanks,
>
>
> Claude
>
>
> On 23/10/10 03:21, aditya siram wrote:
>
>> Hi all,
>> I'm having some issues calling Lua functions from Haskell. I have the
>> following in "Haskell2Lua.lua":
>> function hello ()
>>    return "hello world"
>> end
>>
>> And my Haskell file "Haskell2Lua.hs" looks like this:
>> import qualified Scripting.Lua as
>> Lua
>>
>> main =
>> do
>>
>>     l<-
>> Lua.newstate
>>
>>     Lua.openlibs
>> l
>>
>>     succ<- Lua.loadfile l
>> "/Haskell2Lua.lua"
>>
>>     print succ
>>
>>
>>     Lua.callproc l "hello"
>> ""
>>
>>     Lua.close l
>>
>> When I compile and run this file I get:
>> 0
>> Haskell2Lua: user error (attempt to call a nil value)
>>
>> I have tried some variations on calling the function including:
>> Lua.callproc l "hello"
>> Lua.callfunc l "hello"
>> Lua.callfunc l "hello" ""
>>
>> I know the Lua bridge is working because the following works:
>>
>> Lua.callproc l "print" "Hello from Lua"
>>
>> Any help is appreciated!
>> -deech
>>
>
>
> --
> http://claudiusmaximus.goto10.org
>
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