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I want to do something like this:

I Lua file:


function KeyFunc(key)



SetKeyFunction is a C function. It must to get the address of the 
function and store it in a variable.
Then, when the user press a key, I must call this func (KeyFunc) with 
a parameter (the key pressed).

I have 2 problems: 
1 - how to get and store a Lua function address in a C variable and
2 - how to call it with a parameter from C code.

Any tip?

Thanks in advance