1. Lua Scripting in C#

2. How to Set Things Up Download LuaInterface Unzip
Source code is available to recompile if needed
51Net4 available from 3103 site (ready for .NET 4)
Unzip
lua51.dll and LuaInterface.dll
Place these DLL files in your project
Add them as Reference
Add “using LuaInterface;” atop code

3. Adding the DLL references

4. The LuaInterface Object
LuaInterface l = new Lua(); // executing a single command l.DoString("a=4"); //reading a variable Console.WriteLine(l["a"]); // finishing off l.Close();

5. Simple Lua Example

6. (internal runtime data)
What’s Happening
C# Code
Main l
Heap (Memory)
LuaInterface
Instance
(internal runtime data) a 4

7. LuaInterface (LI) is Persistent
Edit variables in script space
Executing commands
Writing to variables directly
Note the value remains (i.e., think of them as properties within LI)

8. Running a Script In File
C# Code
Main l
Heap (Memory)
Script File (on Disk)
LuaInterface
Instance
(internal runtime data) a
Lua Code
a = 4 4
LuaInterface.Lua l = new Lua();
l.Close();

9. Errors…
Must Change Property…

10. More Errors…

11. Solution: File Formatting

12. Lua and NET Interaction
Heap (Memory)
C# Code
Main
Worker w
LuaInterface
Instance
(internal runtime data)
MainProgram a
Worker
LuaInterface l
string Data
DisplaySomething()
{ … } 4
Script File (on Disk)
Lua Code
a = 4
MainProgram.Data = “Hello World”
MainProgram:DisplaySomething()

13. Accessing CLR/NET Objects
In Lua, we can access attributes using the dot (.) operator
MainProgram.Data = "Hello World"
We can also invoke methods using the colon (:) operator
MainProgram:DisplaySomething()

14. Handling Events In C#, you can define new events
public delegate void SimpleEventHandler();
public event EventHandler SimpleEvent;
Then you can raise the event
SimpleEvent(this, null);
Subscribing to the event enables handling
SimpleEvent += new SimpleEventHandler(DoFunction);

15. Handling Events in Lua
function handle_event() a = a + 1 MainProgram:DisplayState() end function handle_event_different() a = a + 10 MainProgram.SimpleEvent:Add(handle_event) MainProgram.SimpleEvent:Add(handle_event_different) a = 0

16. Testing the Event Handler
l = new Lua(); l["MainProgram"] = this; Timer t = new Timer(new TimerCallback(TimerFired), null, 0, 1000); Console.ReadLine(); l.Close(); private void TimerFired(Object state) { SimpleEvent(this, null); }
function handle_event()
a = a + 1
MainProgram:DisplayState()
end
function handle_event_different()
a = a + 10
MainProgram.SimpleEvent:Add(handle_event)
MainProgram.SimpleEvent:Add(handle_event_different)
a = 0

17. Further Reading http://luaforge.net/projects/luainterface/