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carrayslualua-tablelua-api

Lua table of string values as parameter in C function

I want to make a C function that takes a lua table with strings as parameter, and the lua table does not have any keys, just values. How can I do this? I cannot figure it out. I did not find anything when I searched in google.

Solution

  • The "default" keys in a table are consecutive integers starting from 1. This:

    {"hello", "world"}

    is the same as:

    {[1] = "hello", [2] = "world"}

    You cannot access these entries with lua_getfield, because that takes a string key. You can do it the "manual" way, with lua_pushnumber and lua_gettable. If L is your lua_State*, t is the index of the table on the stack and and k is the key, then:

    lua_pushnumber(L, k);
lua_gettable(L, t);

    should do the same thing as:

    lua_getfield(L, t, k);

    does for string keys. Note that if t is a relative index (a negative number), then because you're pushing another item onto the stack, you'll need to adjust it by 1.