Script_SetSendMailMoney Help

[oldmanofmen]

Hello, for the bot I'm working on getting it to send mail. For this I need to use this function to get the gold sent from the botted character to a bot banker character.

The function's rebased address is: 0x560FF4
This function takes 1 argument which I am assuming is the gold value.

I am trying to call it like this:

push eax
mov eax, Base + 0x560FF4
call eax
retn

Since there are no examples of this function being called within the client does anyone have any idea how this function is called correctly?

[l0l1dk]

It's a Lua C function. The argument is the Lua state. The function retrieves its arguments from Lua's stack when it's called.

The easiest way to call it is to use FrameScript::ExecuteBuffer or a similar function to run a Lua string which calls it.

[Master674]

You could call it like that:

lua_getglobal(L, "SetSendMailMoney"); // pushes SetSendMailMoney onto the stack (@ -2)
lua_pushinteger(L, amount); // push argument (stack @ -1)
lua_pcall(L, 1, 0, 0);// calls the function just below the number of argument (1) from the top of the stack (= -2)

[SKU]

You could call it like that:

lua_getglobal(L, "SetSendMailMoney"); // pushes SetSendMailMoney onto the stack (@ -2)
lua_pushinteger(L, amount); // push argument (stack @ -1)
lua_pcall(L, 1, 0, 0);// calls the function just below the number of argument (1) from the top of the stack (= -2)

If it fails (unlikely, seeing as the parameter is correct), you might want to pop the error message off the stack.

// Version: 5.3.0 17128 Jun 26 2013
// Not rebased / assumes base 0x00400000.

// Lua.
enum
{
	klua_gettop = 0x004D50FF,
	klua_settop = 0x004D5110,

	klua_insert = 0x004D51FD,
	klua_remove = 0x004D5163,

	klua_isnumber = 0x004D54FF,
	klua_isstring = 0x004D552D,

	klua_pushvalue = 0x004D541D,

	klua_type = 0x004D54A0,
	klua_typename = 0x004D54BF,

	klua_tonumber = 0x004D55C6,
	klua_tointeger = 0x004D55F5,
	klua_toboolean = 0x004D5657,
	klua_tolstring = 0x004D567F,

	klua_pushnil = 0x004D57A8,
	klua_pushnumber = 0x004D57C4,
	klua_pushinteger = 0x004D57E8,
	klua_pushlstring = 0x004D580C,
	klua_pushstring = 0x004D5851,

	klua_pushcclosure = 0x004D58D5,
	klua_pushboolean = 0x004D59B5,

	klua_gettable = 0x004D5A30,
	klua_getfield = 0x004D5A56,
	klua_rawget = 0x004D5AAA,
	klua_rawgeti = 0x004D5B3A,
	klua_createtable = 0x004D5BC9,

	klua_settable = 0x004D5DF9,
	klua_setfield = 0x004D5E26,
	klua_rawset = 0x004D5E7E,
	klua_rawseti = 0x004D5F3F,

	klua_call = 0x004D6128,
	klua_pcall = 0x004D6177,
	klua_load = 0x004D61DD,

	klua_next = 0x004D63B0,
};

L = [0x00F23D50]

[Corthezz]

Hey,
as this thread is about executing Lua functions in a different way I would like to ask one question.
Does using this method have any advantage or significant differences over using DoString or ExecuteBuffer to call WoW API functions?

[Jadd]

Why bother to mess with Lua? The function is really quite simple:

signed int __cdecl Script_SetSendMailMoney(lua_state *L)
{
  signed int result; // eax@2
  unsigned __int64 amount; // [sp+Ch] [bp-8h]@3

  if ( lua_isnumber(L, 1) && CGGameUI::GetWOWMONEYFromLua(L, 1, &amount) )
  {
    if ( CGMailInfo::SetSendMoney(amount) )
      lua_pushnumber(L, 1.0);
    else
      lua_pushnil(L);
    result = 1;
  }
  else
  {
    luaL_error(L, "Usage: SetSendMailMoney(amount)");
    result = 0;
  }
  return result;
}

You can simply use the SetSendMoney function:

signed int __cdecl CGMailInfo::SetSendMoney(unsigned __int64 amount)

[oldmanofmen]

Thanks all and sorry for the poorly written question, I'm surprised any of you actually understood what I meant. It was early in the morning when I wrote the question. This has been immensely helpful and I have managed to get it working and doing exactly what I wanted it to do. Thanks again.

[Bananenbrot]

Hey,
as this thread is about executing Lua functions in a different way I would like to ask one question.
Does using this method have any advantage or significant differences over using DoString or ExecuteBuffer to call WoW API functions?

Using the lua API is
1. more generic, as it enables you to start your own, seperated lua state (unlikely to be of benefit)
2. less suspicious, since you don't use FrameScript_Execute as everyone else
3. letting you realize how lua works and appropriate stack cleanup

It's a matter of taste, but using the lua API is certainly not worse (aesthetically) than using FrameScript_Execute. In my eyes, using FrameScript_Execute is like cnping one of those ugly MSDN samples directly into your code: It works as far as you can tell, but you don't know its side effects or how changes affect its functionality.
So as long as you can easily execute functions from the main thread, I would go for the lua API.