Re: Determine if function is defined with C API?

["Mauro Iazzi" <mauro.iazzi@...>]

2008/8/1 Jerome Vuarand <jerome.vuarand@gmail.com>:
> 2008/8/1 Joey Mukherjee <joey@swri.edu>:
>> Here's a snippet of my code:
>>
>>        lua_getglobal (LState, "get_number_of_sensors");           //
>> function to be called
>>        if (lua_isfunction (LState, 0) == 1) {
>>            if (lua_pcall (LState, 0, 1, 0) == 0) {
>>
>> This doesn't work.  Is it because I don't have the right index?  I am
>> assuming the lua_getglobal either found the function or if it didn't, how
>> would I know?  How do I find the right index to send to lua_isfunction?
>
> lua_getglobal pushes the global on the top of the stack. The index of
> the top of the stack is either -1 or lua_gettop(L). That is the value
> you should pass to lua_isfunction.
>

and in any case stack indexes start at 1, so using 0 is an error.