试图索引数值。 C ++和Lua

Question

I'm trying to write a kind of engine that uses Lua as a script language. It gives me the error in the title.

#define el Engine::lua
int vecCreate(lua_State* vm) {
    int argc = el.argc();
    el.createTable();
    if (argc == 0) {
        el.tableAddd("x", 0.0);
        el.tableAddd("y", 0.0);
    } else if (argc == 2) {
        el.tableAddd("x", el.argd());
        el.tableAddd("y", el.argd());
    }
    return 1;
}
void Lua::createTable() {
    lua_createtable(vm, 2, 0);
    }
void Lua::tableAddd(string key, double val) {
    lua_pushstring(vm, key.c_str());
    lua_pushnumber(vm, val);
    lua_settable(vm, -3);
}
double Lua::argd() {
    double res = lua_tonumber(vm, 1);
    lua_pop(vm, 1);
    return res;
}

Am I doing it wrong? The whole script is

function draw()
    drawColor(100, 100, 100)
    drawPoly(vecNew(10, 10), vecNew(10, 100), vecNew(100, 100), vecNew(100, 10))
end

Yes, I'm sure that the problem is in the draw function

Answer 1

没关系，我在获取参数之前只是在vecCreate的堆栈上推了一个表