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Get Ready to Unleash the Power of UCanCode .NET

Call Lua Script in Visual C++ / MFC Sample

*Lua script (below) to customize preferences and content of UI (above).

1

This article shows a way to integrate Lua in your application.

2

Lua is an extension programming language designed to support general procedural programming with data description facilities. It also offers good support for object-oriented programming, functional programming, and data-driven programming. Lua is intended to be used as a powerful, light-weight configuration language for any program that needs one. Lua is implemented as a library, written in clean C (that is, a common subset of ANSI C and C++).

Sample of Lua Syntax (FOR loop):

for i=1,10 do
    -- the first program in every language
    io.write("Hello world, from ",_VERSION,"!\n")
end
  • For full description see: About.

3

This sample is a WTL application (simple HTML help systems), that integrates Lua scripts to customize preferences and content.

It defines the Lua function:

-- # MessageBox
--------------------------------------------------------
-- int MessageBox(
-- string msg, |= Message to display
-- string capition |= Capition of Box
-- );
-- Return Value:
-- if 1 the user click in OK or user close the box


-- # ShowContentPainel
-----------------------------------------------------------------
-- void ShowContentPainel(
-- bool bShow |= If true, the painel start opened, if false not.
-- );

-- # SetWindowStartSize
-----------------------------------------------------------------
-- void SetWindowStartSize(
-- number w, |= Start W size of window
-- number h, |= Start H size of window
-- );
-- Remarks:
-- if this function is not called, the default size is 800 x 600

-- # SetMinWindowSize
-----------------------------------------------------------------
-- void SetMinWindowSize(
-- number w, |= Minimum W size of window
-- number h, |= Minimum H size of window
-- );

-- # SetTitle
-----------------------------------------------------------------
-- void SetTitle(
-- string title |= Text that be title of window.
-- );

-- # Navigate
-----------------------------------------------------------------
-- void Navigate(
-- string url |= Url
-- );

-- # InsertItemInPainel
-----------------------------------------------------------------
-- void InsertItemInPainel(
-- string title, |= Text displayed in tree
-- string url, |= Url
-- number icon, |= Icon of item, the possible values 
                           ---are: 0 = BOOK, 1 = FILE, 2 = NETFILE
-- number id, |= Id of item, this has to be unique and start in 1
-- number idp |= Parent item, this is a ID of a item that is 
                                ---the parent or '0' for root item.
-- );
-- sample:
-- ICON BOOK / ID 1 / In ROOT
-- InsertItemInPainel("Trinity Systems", 
            "http://www.novaamerica.net/trinitysystems/", 0, 1, 0); 
-- ICON NETFILE / ID 2 / In ID1 (Trinity Systems)
-- InsertItemInPainel("Orion", 
       "http://www.novaamerica.net/trinitysystems/Orion", 2, 2, 1); 

-- # ExpandItemInPainel
------------------------------------------------------------------
-- void ExpandItemInPainel(
-- string id |= Id of item
-- );
-- Remarks:
-- This function need to be called after InsertItemInPainel's

...and now I'll show you how to create these functions in Lua/C++.

4

  1. The first thing to do is to build the DLL that contains Lua. (download Lua DLL demo project)
  2. Link this in your project:
    //
    // For sample:
    //
    //---------------------------------------------
    // Library Linkage
    //---------------------------------------------
    //-
    #if defined (_DEBUG)
    #pragma comment( lib, "lua.lib" ) // Lua Support
    #else
    #pragma comment( lib, "lua.lib" ) // Lua Support
    #endif
    //-

    Remember: To change your Project Property -> linker -> general -> additional library directory: lua lib directory.

  3. Add Lua include files:
    extern "C" 
    {
    #include <span class="code-string">"lua.h"
    </span>
    }

    Remember: To change your Project Property -> C/C++ -> general -> additional include directories: lua include directory.

    Notice that all the files in lua lib need to stay with "c" extension, because Lua was written to be ANSI C compliant.

  4. Now we need to start Lua VM as follows:
    LRESULT OnCreate(UINT 
    /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& 
    /*bHandled*/)
    {
    //...
    // Lua
    //
    lua_State *luaVM = lua_open(); /* 
    Open Lua */
    //
    luaopen_base(luaVM );     /* opens the 
    basic library */
    luaopen_table(luaVM );    /* opens the table 
    library */
    luaopen_io(luaVM );       /* opens 
    the I/O library */
    luaopen_string(luaVM );   /* opens the string 
    lib. */
    luaopen_math(luaVM );     /* opens the math lib. 
    */
    if (NULL == 
    luaVM)
    {
             
    MessageBox("Error Initializing lua\n");
    }
    //...
    // Do things with lua 
    code.
    // see below
    //...
    lua_close(luaVM); /* Close Lua */
    //
    // 
    End
    //...
    }
  5. Now we make a glue function of Lua and C/C++.

    The Lua API function to do this is:

    lua_register(s, n, g)

    where

    • s: is the lua_State to register the function.
    • n: is the name of the function exposed to Lua.
    • g: the C/C++ glue function.

    See the sample:

    //...
    // Do things with 
    lua code.
    lua_register( luaVM, "SetHome", l_SetHome );
    //...
    // 
    -------------------------------------------
    // 
    #Lua Functions
    // 
    ------------------------------------------
    //
    static 
    int l_SetTitle( lua_State* 
    luaVM)
    {
             const char* 
    title = luaL_checkstring(luaVM, 
    1);
             
    theMainFrame->SetWindowText(title);
             
    return 0;
    }
  6. Now we need the load and execute Lua scripts:
    //...
    // Do things with lua 
    code.
    lua_register( luaVM, "SetHome", l_SetHome );
    //more glue 
    functions
    lua_dofile(luaVM, "hrconf.lua");
    //...

    The Lua API function to do this is:

    lua_dofile(s, p)

    where

    • s: is the lua_State to register the function.
    • p: path for Lua script file.

    See the demo script.

For a complete understanding of the Lua API, see: Lua 5.0 Reference Manual.

4

Lua_Lib.zip

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