delphi6直连redis服务（用lua脚本redis模块）

一、创建一个exe程序

创建一个exe程序，引用LuaRedis.pas单元（此单元自己封装的代码，目前主要封装了获取key和设置key/value功能），代码如下：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    btn2: TButton;
    Memo1: TMemo;
    edt1: TEdit;
    edt2: TEdit;
    edt3: TEdit;
    btn3: TButton;
    edt4: TEdit;
    procedure btn2Click(Sender: TObject);
    procedure btn3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
uses
  LuaRedis;
  
{$R *.dfm}

procedure TForm1.btn2Click(Sender: TObject);
var
  sTmp, sErrorMsg: string;
begin
  Memo1.Text := '';
  try
    sTmp := getValue(Trim(edt1.Text), sErrorMsg);    // value111
    Memo1.Text := sTmp + '->' + sErrorMsg;
  except
    on e:Exception do begin
      ShowMessage('【异常】' + e.Message);
      Exit;
    end;
  end;
end;

procedure TForm1.btn3Click(Sender: TObject);
var
  sKey, sValue, sErrorMsg: string;
begin
  Memo1.Text := '';
  try
    sKey := Trim(edt2.Text);
    if setKeyValue(sKey, Trim(edt3.Text), StrToIntDef(Trim(edt4.Text), 0), sErrorMsg) then begin   // key111  value111
      sValue := getValue(Trim(edt2.Text), sErrorMsg);
    end;
    Memo1.Text := sKey + ':' + sValue + '->' + sErrorMsg;
  except
    on e:Exception do begin
      ShowMessage('【异常】' + e.Message);
      Exit;
    end;
  end;
end;

end.

二、封装LuaRedis.pas单元代码

上面说的封装LuaRedis.pas单元（通过registerLuaState()和destroyLuaState()来加载和销毁lua的状态机），同时引用Lua.pas, LuaLib.pas单元，代码如下：

unit LuaRedis;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, Lua, LuaLib;

const
  C_LuaPathFileName = './luaScript/mytest.lua';

function getValue(myKey: string; var sErrorMsg: string): string;

function setKeyValue(myKey, myValue: string; myExpire: Integer; var sErrorMsg: string): Boolean;

var
  LuaObj: TLua;
  L: TLuaState;

implementation

function loadLuaScript(sLuaPathFileName: String; var sErrorMsg: string): Boolean;
var
  nTmp: Integer;
begin
  Result := False;
  try
    sErrorMsg := '默认提示消息（loadLuaScript）！';
    if not FileExists(sLuaPathFileName) then begin
      sErrorMsg := '未查到路径中此Lua脚本文件（' + sLuaPathFileName + '）';
      Exit;
    end;
    nTmp := LuaObj.DoFile(sLuaPathFileName);
    case nTmp of
      LUA_OK : begin
        sErrorMsg := '成功加载路径中此Lua脚本文件！';
        Result := True;
      end;
      LUA_ERRSYNTAX : sErrorMsg := '在预编译Lua文件时发现了语法错误！';
      LUA_ERRMEM : sErrorMsg := '在执行Lua文件时内存分配错误！';
      LUA_ERRRUN : sErrorMsg := '在执行Lua文件中在调用函数时发生了运行时错误！';
      else
      sErrorMsg := '加载失败路径中此Lua脚本文件！';
    end;
  except
    on e:Exception do begin
      Result := False;
      sErrorMsg := '【异常】方法（loadLuaScript）：' + e.Message;
      Exit;
    end;
  end;
end;

function getValue(myKey: string; var sErrorMsg: string): string;
var
  nRet: Integer;
begin
  try
    sErrorMsg := '默认提示消息（getValue）！';
    if not loadLuaScript(C_LuaPathFileName, sErrorMsg) then begin
      Exit;
    end;
    lua_getglobal(L, 'getValue');
    lua_pushstring(L, PAnsiChar(myKey));
    nRet := lua_pcall(L, 1, 1, 0);
    if nRet = 0 then begin
      Result := lua_toString(L, -1);
      sErrorMsg := 'Lua脚本正常执行';
      Exit;
    end else
      sErrorMsg := 'Lua脚本执行失败！';
  except
    on e:Exception do begin
      Result := '';
      sErrorMsg := '【异常】方法（getValue）：' + e.Message;
      Exit;
    end;
  end;
end;

function setKeyValue(myKey, myValue: string; myExpire: Integer; var sErrorMsg: string): Boolean;
var
  nRet: Integer;
begin
  Result := False;
  try
    sErrorMsg := '默认提示消息（setKeyValue）！';
    if not loadLuaScript(C_LuaPathFileName, sErrorMsg) then begin
      Exit;
    end;
   
    lua_getglobal(L, 'setKeyValue');
    lua_pushstring(L, PAnsiChar(myKey));
    lua_pushstring(L, PAnsiChar(myValue));
    lua_pushinteger(L, myExpire);
    nRet := lua_pcall(L, 3, 1, 0);
    if nRet = 0 then begin
      Result := (lua_toInteger(L, -1) = 1);
      sErrorMsg := 'Lua脚本正常执行';
      Exit;
    end else
      sErrorMsg := 'Lua脚本执行失败！';
  except
    on e:Exception do begin
      Result := False;
      sErrorMsg := '【异常】方法（setKeyValue）：' + e.Message;
      Exit;
    end;
  end;
end;

procedure registerLuaState();
begin
  if LuaObj = nil then begin
    LuaObj := TLua.Create;
    if L = nil then begin
      L := LuaObj.LuaInstance;
    end;
    // luaL_openlibs 是一个由 luaL（Lua 实用程序库）提供的函数，它用于打开一组标准的Lua库。
    // 这些库通常包括基础库（base）、字符串处理库（string）、表操作库（table）、数学函数库（math）、I/O库（io）、操作系统库（os）等。
    // 这个函数通常在你的C/C++程序中与Lua交互时使用，以提供完整的Lua标准库功能。
    luaL_openlibs(L);
  end;
end;

procedure destroyLuaState();
begin
  if LuaObj <> nil then begin
    if L <> nil then begin
      L := nil;
    end;
    LuaObj.Free;
  end;
end;

initialization
  registerLuaState();

finalization
  destroyLuaState();

end.

三、封装的Lua, LuaLib单元

封装的Lua, LuaLib单元，代码如下：

{ 
/** 
 * @package     Delphi Lua 
 * @copyright   Copyright (c) 2009 Dennis D. Spreen (http://www.spreendigital.de/blog) 
 * @license     http://opensource.org/licenses/gpl-license.php GNU Public License 
 * @author      Dennis D. Spreen <dennis@spreendigital.de> 
 * @version     1.3 
 * @revision    $Id: Lua.pas 102 2009-09-30 11:39:41Z dennis.spreen $ 
 */ 
 
History 
1.3     DS      Improved Callback, now uses pointer instead of object index 
                Modified RegisterFunctions to allow methods from other class 
                to be registered, moved object table into TLua class 
1.2 DS  Added example on how to extend lua with a delphi dll 
1.1     DS      Improved global object table, this optimizes the delphi 
                function calls 
1.0     DS      Initial Release 
 
Copyright 2009  Dennis D. Spreen (email : dennis@spreendigital.de) 
 
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version. 
 
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
GNU General Public License for more details. 
 
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA 
}  
  
unit Lua;  
  
interface  
  
uses  
  Classes,  
  LuaLib;  
  
type  
  TLuaState = Lua_State;  
  
  TLua = class(TObject)  
  private  
    fAutoRegister: Boolean;  
    CallbackList: TList;  // internal callback list  
  public  
    LuaInstance: TLuaState;  // Lua instance  
    constructor Create(AutoRegister: Boolean = True); overload; virtual;  
    destructor Destroy; override;  
    function DoFile(Filename: String): Integer; virtual;// load file and execute  
    procedure RegisterFunction(FuncName: AnsiString; MethodName: AnsiString = ''; Obj: TObject = NIL); virtual; //register function  
    procedure AutoRegisterFunctions(Obj: TObject);  // register all published functions  
    procedure UnregisterFunctions(Obj: TObject); // unregister all object functions  
  end;  
  
implementation  
  
type  
  TProc = function(L: TLuaState): Integer of object; // Lua Function  
  
  TCallback = class  
    Routine: TMethod;  // Code and Data for the method  
    Exec: TProc;       // Resulting execution function  
  end;  
  
//  
// This function is called by Lua, it extracts the object by  
// pointer to the objects method by name, which is then called.  
//  
// @param       Lua_State   L   Pointer to Lua instance  
// @return      Integer         Number of result arguments on stack  
//  
function LuaCallBack(L: Lua_State): Integer; cdecl;  
var  
  CallBack: TCallBack;       // The Object stored in the Object Table  
begin  
  // Retrieve first Closure Value (=Object Pointer)  
  CallBack := lua_topointer(L, lua_upvalueindex(1));  
  
  // Execute only if Object is valid  
  if (assigned(CallBack) and assigned(CallBack.Exec)) then  
    Result := CallBack.Exec(L)  
  else  
    Result := 0;  
end;  
  
{ TLua }  
  
//  
// Create a new Lua instance and optionally create Lua functions  
//  
// @param       Boolean      AutoRegister       (optional)  
// @return      TLua                            Lua Instance  
//  
constructor TLua.Create(AutoRegister: Boolean = True);
begin  
  inherited Create;  
  // Load Lua Lib if not already done  
  if (not LuaLibLoaded) then  
    LoadLuaLib();  
  
  // Open Library  
  LuaInstance := Lua_Open();  
  luaopen_base(LuaInstance);  
  
  fAutoRegister := AutoRegister;  
  
  // Create Object List on initialization  
  CallBackList := TList.Create;  
  
  // if set then register published functions  
  if (AutoRegister) then  
    AutoRegisterFunctions(self);  
end;  
  
//  
// Dispose Lua instance  
//  
destructor TLua.Destroy;  
begin  
  // Unregister all functions if previously autoregistered  
  if (fAutoRegister) then  
    UnregisterFunctions(Self);  
  
  // dispose Object List on finalization  
  CallBackList.Free;  
  
  // Close instance  
  Lua_Close(LuaInstance);  
  inherited;  
end;  
  
//  
// Wrapper for Lua File load and Execution  
//  
// @param       String  Filename        Lua Script file name  
// @return      Integer  
//  
function TLua.DoFile(Filename: String): Integer;  
begin  
  Result := lual_dofile(LuaInstance, PAnsiChar(AnsiString(Filename)));  
end;  
  
//  
// Register a new Lua Function and map it to the Objects method name  
//  
// @param       AnsiString      FuncName        Lua Function Name  
// @param       AnsiString      MethodName      (optional) Objects Method name  
//  
procedure TLua.RegisterFunction(FuncName: AnsiString; MethodName: AnsiString = ''; Obj: TObject = NIL);  
var  
  CallBack: TCallBack; // Callback Object  
begin  
  // if method name not specified use Lua function name  
  if (MethodName = '') then  
    MethodName := FuncName;  
  
  // if not object specified use this object  
  if (Obj = NIL) then  
    Obj := Self;  
  
  // Add Callback Object to the Object Index  
  CallBack := TCallBack.Create;  
  CallBack.Routine.Data := Obj;  
  CallBack.Routine.Code := Obj.MethodAddress(String(MethodName));  
  CallBack.Exec := TProc(CallBack.Routine);  
  CallbackList.Add(CallBack);  
  
  // prepare Closure value (Method Name)  
  lua_pushstring(LuaInstance, PAnsiChar(FuncName));  
  
  // prepare Closure value (CallBack Object Pointer)  
  lua_pushlightuserdata(LuaInstance, CallBack);  
  
  // set new Lua function with Closure value  
  lua_pushcclosure(LuaInstance, LuaCallBack, 1);  
  lua_settable(LuaInstance, LUA_GLOBALSINDEX);  
end;  
  
//  
// UnRegister all new Lua Function  
//  
// @param       TObject     Object      Object with prev registered lua functions  
//  
procedure TLua.UnregisterFunctions(Obj: TObject);  
var  
  I: Integer;  
  CallBack: TCallBack;  
begin  
  // remove obj from object list  
  for I := CallBackList.Count downto 1 do  
  begin  
    CallBack := CallBackList[I-1];  
    if (assigned(CallBack)) and (CallBack.Routine.Data = Obj) then  
    begin  
      CallBack.Free;  
      CallBackList.Items[I-1] := NIL;  
      CallBackList.Delete(I-1);  
    end;  
  end;  
end;  
  
//  
// Registe