Lua C Api Requirement
Lua C Api Requirements
Lua C Api Requirements
Lua C Api Requires
Lua C Api Require
Lua C Api Required

The lua source can be found at the lua website here. We'll be using the latest version, 5.2.3 (though other recent versions of Lua will behave similarly).

Once you have the latest lua source, it's time to build it. (Yes, you could just download header files and the .dll, but what's the fun in that? When available, it's always better to have the source, that way you can see how things are really working -- and you can debug more easily). Using visual studio:

Open up Visual Studio, and create a new project

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In the Project Creation wizard, check the 'static library' radio button to build as a static library.

Add the lua source to the project. Just dragging the files directly from their folders into the project works well for this.
There are two source files that you don't need: lua.c and luac.c. These files contain the main program for the command line interpreter and the bytecode compiler, respectively. You can remove this files from the project if you wish. If you are building as a static library, having more than one main won't be a problem. However, if you are building as an executable, then you will need to exclude one of these files from the project. Right-click on them in the project explorer and select 'Exclude from Project'

You now have a project that you can add to any solution that needs lua. Once you have added the lua project to your game, you need to do a few more steps:

Further complicating things is that with every major version of Lua, the method of calling Lua from C changes. Much documentation on the Internet is specific to Lua 5.0, and won't work on 5.1. Likewise, this documentation is specific to 5.1, and when 5.2 comes out (it's alpha right now), the documentation on this page won't work on the new version.

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A Lua 5.3 library for accessing Lua's C-API. About This is a Lua 5.3 library for accessing and managing individual Lua states as if by the C-API, but within Lua itself.

In the properties for the project that is using lua, be sure that the directory that contains the lua .h files is included in the set of include paths. If at all possible, make these paths relative, and not absolute
Your project will need to get at the .lib files for the lua. There are a few ways to do this:
- Add a reference from your project to the lua project. Right-click on your project in the project explorer, and select References:
  Add a new reference:
  Select the lua project:
- Or, add Lua.lib to 'Additional Dependencies' (in the Librarian/Genrerl tab of the Project Property Pages) and add the directory where Lua.lib lives to 'Additional Library Directories' (also in the Librarian/Genrerl tab of the Project Property Pages).

Once we have build Lua, and set up our project dependencies correctly, we are ready to use in on our application,

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First off, we need to include the proper header files. Since Lua is ANSI C, if we are coding in C++, we will need to enclose the #includes in extern 'C':

Everything that we need to mantain the current state of the interprer (all global tables, etc) is stored in a variable of type lua_State. The first thing we need to do is create an initial state (essentially, an instantiation of the lua interpreter), which is done by the call:

Every time we want to access the interpreter, we need to pass in this state variable. We can actually have as many instances of Lua state variables as we like (for instance, if we wanted to run separate instances of the interpreter on separate processors, or we wanted different scripts to have different global namespaces), though typically people just use one instance of the interpreter that all scripts use. The global tables in this state variable contain all 'core' functions, but none of the libraries. The libraries contain a bunch of important functions -- including everything in math, and i/o functions like print -- so we'd like to load them. We can load libraries with the call:

So, now we have the skeleton of a main function:

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We are ready to start using lua!

We will start with the simplest way to use lua -- have the interpreter execute a file. This is functionally equivalent to the dofile command from within lua (and unsurprisingly, has the same name!). To execute the file 'test.lua', we can use the call:

Note that if we are using relative paths other than absolute paths under windows, then the system will look in the current working directory -- which is the directory that the executable file is in (if you double-click on the executable), or the directory that the project is in (if you run from within Visual Studio) You can, of course, change the working directory that the debugger uses under the project settings in Visual Studio.

So, if we use the following myFile.lua:

Lua C Api Requirement

when the command luaL_dofile(L, 'myFile.lua') is executed, the following will be printed out

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Note that the dofile command not only computes these values and prints them out, it also adds the fib function to the global namespace of our lua enviornment (stored in the C variable L).

We can also call lua functions directly from C/C++, and get back the return values to use in our C/C++ code. To call a lua function we:

Push the function on the top of the lua stack, using a call to

lua_getGlobal(lua_state *L, char *globalName)

Push the arguments to the function on the lua stack, using the functions:

lua_pushnumber(lua_state *L, float number)
lua_pushstring(lua_state *L, char *str)
lua_pushboolean(lua_state *L, bool)
lua_pushuserdata(lua_state *L, void *userdata)
lua_pushnil(lua_state *L)

Call the function, using the function:

lua_call(lua_state *L, int numArguments, int numReturnValues)
We need to pass in both the number of arguments that we are passing in, and the number of arguments that we expect in return. Lua is very loose about the number of arguments and return value, but C/C++ is less so -- hence we need to be explicit when calling lua from C/C++.

Extract the return values, using the functions:

int lua_tointeger(lua_state *L, int stackLocation)
Grab an integer value off the lua stack. The first return value is at index -1, the second return value is at index -2, and so on.
double lua_tonumber(lua_state *L, int stackLocation)
Grab a double value off the lua stack. The first return value is at index -1, the second return value is at index -2, and so on.
const char *lua_tolstring(lua_state *L,