TestInt64.cs

    using UnityEngine;
    using System.Collections;
    using System;
    using LuaInterface;
    using System.Collections.Generic;


    public class TestInt64 : MonoBehaviour
    {
        private string tips = "";

        string script =
            @"            
                function TestInt64(x)                
                    x = x + 789        
                    assert(tostring(x) == '9223372036854775807')        
                    local low, high = int64.tonum2(x)                
                    print('x value is: '..tostring(x)..' low is: '.. low .. ' high is: '..high.. ' type is: '.. tolua.typename(x))           
                    local y = int64.new(1,2)                
                    local z = int64.new(1,2)

                    if y == z then
                        print('int64 equals is ok, value: '..int64.tostring(y))
                    end

                    x = int64.new(123)                   

                    if int64.equals(x, 123) then
                        print('int64 equals to number ok')
                    else
                        print('int64 equals to number failed')
                    end

                    x = int64.new('78962871035984074')
                    print('int64 is: '..tostring(x))

                    local str = tostring(int64.new(3605690779, 30459971))                
                    local n2 = int64.new(str)
                    local l, h = int64.tonum2(n2)                        
                    print(str..':'..tostring(n2)..' low:'..l..' high:'..h)                  

                    print('----------------------------uint64-----------------------------')
                    x = uint64.new('18446744073709551615')                                
                    print('uint64 max is: '..tostring(x))
                    l, h = uint64.tonum2(x)      
                    str = tostring(uint64.new(l, h))
                    print(str..':'..tostring(x)..' low:'..l..' high:'..h)     

                    return y
                end
            ";


        void Start()
        {
    #if UNITY_5        
            Application.logMessageReceived += ShowTips;
    #else
            Application.RegisterLogCallback(ShowTips);
    #endif        
            new LuaResLoader();
            LuaState lua = new LuaState();
            lua.Start();
            lua.DoString(script, "TestInt64.cs");                

            LuaFunction func = lua.GetFunction("TestInt64");
            func.BeginPCall();
            func.Push(9223372036854775807 - 789);
            func.PCall();
            long n64 = func.CheckLong();        
            Debugger.Log("int64 return from lua is: {0}", n64);
            func.EndPCall();
            func.Dispose();
            func = null;

            lua.CheckTop();
            lua.Dispose();
            lua = null;              
        }

        void ShowTips(string msg, string stackTrace, LogType type)
        {
            tips += msg;
            tips += "\r\n";
        }

        void OnDestroy()
        {
    #if UNITY_5        
            Application.logMessageReceived -= ShowTips;
    #else
            Application.RegisterLogCallback(null);
    #endif
        }

        void OnGUI()
        {        
            GUI.Label(new Rect(Screen.width / 2 - 200, Screen.height / 2 - 150, 400, 300), tips);        
        }
    }

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