Lua will then know that top 2 values in the stack are the returned values. The stack we’ve described is not global. Each function has its own stack. Let’s put all this together into main.c. Main function illustrates how to run lua code from C.
Calling LUA functions from C/C. With LUA it is also possible to call LUA functions from C/C. This technique can for example be used to allow execution of events by user-defined scripts. Doing it is pretty simple and requires you only to get the function name and to push the values on the stack.

FungusLua is an easy way to add Lua scripting to any Unity project. It's based on the MoonSharp project, and works great with the Fungus story telling tool f. One Way to Call a Lua Function from C. Now that we have the Lua code to draw mazes, let’s see how to write a C program that can run the Lua file. As examples of why this is useful, you could run a Lua script from Objective-C in an iOS app, or run a cross-platform Lua script from platform-specific C or C code. https://strategicclever.amebaownd.com/posts/20586755.

Lua is a light-weight scripting language designed to extend existing C and C++ programs. Lua was created in 1993 by Roberto Ierusalimschy. More than an extensible language, Lua is a glue language. In Lua we can create an application by gluing together existing high-level components(like C or C++). Many people use Lua embedded in an application program, such as CGILua (for building dynamic Web pages) or a game.

Here I am trying to demonstrate a simple example for calling C functions from Lua. For that I am using version 5.1 of Lua. There are some pretty major differences in each version of Lua. I have a C program called avltree.c and I am calling a C function from avl_input.lua. Here we are telling the Lua Interpreter about the C function and we call it from Lua.

Defining the function:

The first step is to define the function.

typedef int (*lua_CFunction) (lua_State *L);

The functions must have a Lua interpreter as the only argument and return only an integer. Since a Lua interpreter is used for the argument, the function can actually take any number of arguments that are read from the stack.

The C avl_input() function given below will demonstrate accepting multiple arguments and returning an integer value.

The lua_gettop() function returns the index of the top of the stack.
Error handiling is done by lua_error() function.
The arguments are pushed to the stack.
After inserting the elements to AVL tree from the stack, we will find the balance factor and push back the result(balance factor) to the stack by using lua_pushnumber() function.
Here the return represents teh number of results to the avl_input.lua

Following is the avl_input function:

static int avl_input(lua_State *L)
{
int bf, i;
/* get number of arguments */
int n = lua_gettop(L);
int arr[10];
struct node*h1 = 0;

/* loop through each argument */
for (i = 1; i <= n; i++)
{
if (!lua_isnumber(L, i))
{
lua_pushstring(L, 'Incorrect argument to 'avl_input');
lua_error(L);
}
/* total the arguments */
arr[i] = lua_tonumber(L, i);
}
/*insert elements to the avltree from avl_input.lua*/
for (i = 1; i <= n; i++)
{
h1 = insert(h1, new(arr[i]));
}

print_inorder(h1);
printf('n—–Balance Factor——n');
bf = balance_factor(h1);
lua_pushnumber(L, bf);

return 1;
}

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The main function will have the following code:

int main()
{
/* initialize Lua */
L = lua_open();

/* load Lua base libraries */
luaL_openlibs(L);

/* register our function */
lua_register(L, 'avl_input', avl_input);

/* run the script */
luaL_dofile(L, 'avl_input.lua');

/* cleanup Lua */
lua_close(L);

return 0;
}

The following is a simple Lua script which calls C function avl_input with the given number of argument and prints the return value. Save this as avl_input.lua.

a = avl_input(3,2,1,4,5,6,7,16,15,14)
print (a)

Running the program:

Compile the program by typing this command:

#gcc -Wall avltree.c -o AVL -llua -lm -ldl

#./AVL

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

Create a win 32 console application
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:

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,

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:

Fungus How To Call C In Luang

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

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 syste