Access Violation on C function exposed to Lua

[Rick]

I've exposed C functions inside DLL's just fine to lua, but now I'm trying to expose C functions from the LE exe to lua and getting an access violation error when I call lua_pushcfunction(). I can call the C function just fine in the same place so not sure why the access violation is happening.

 

bool App::Start()
{
   // calling the function I"m trying to register works so the function is valid
   UpdateStat(Interpreter::L);

   // register lua to c++ functions
   lua_pushcfunction(Interpreter::L, UpdateStat);   // this fails with access violation error
   lua_setglobal(Interpreter::L, "UpdateStat");
}



static int UpdateStat(lua_State* L)
{
   return 0;
}

[Rick]

Bah nvm. Forgot to call GetStackSize() before doing this.

[miko93]

Rather than creating a new topic, I feel free to jump in here with a related question.

Anyone got objects (Vec3, in my case) passed between lua and C?

 

For e.g. int types, I would do like (calling from lua into C)

lua_register(Interpreter::L, "CalledFromLua", CalledFromLua);

extern "C" int CalledFromLua(lua_State* L)
{
  int i = lua_tointeger(Leadwerks::Interpreter::L,1)
  CallMyFunc(i);
  return 0;
}

 

and (calling from C into lua)

void CalledFromC(int i)
{
  lua_getglobal(Leadwerks::Interpreter::L, "AFunction");
  if (!lua_isfunction(Leadwerks::Interpreter::L, -1)) { lua_pop(Leadwerks::Interpreter::L, 1); return; }

  lua_pushinteger(Leadwerks::Interpreter::L, i);
  if (lua_pcall(Leadwerks::Interpreter::L, 1, 0, 0) != 0)
  { printf("Callback_ClientPosRot ERROR: %s\n", lua_tostring(Leadwerks::Interpreter::L, -1)); return; }
}

 

But with e.g. Vec3, this seems to be a bit more complicated. Like, using 'userdata' or such things.

Any hints?