用SWIG实现C++和Lua互相调用实例

男娘i 2022-06-11 00:29 299阅读 0赞

苦于一直在网上找不到关于C++和Lua互相调用的实例代码自己写了一份，比较乱以后有时间整理下。  
主要涉及到  
c++调用Lua函数。传递C++自定义类型  
C++调用Lua函数，返回值是自定义类型  
Lua函数根据传进来的自定义C++数据类型进行进行类成员操作。  
打算有时间在做Lua返回New出来的C++自定义类型对象，实现内存回收方面的问题。  
主要用到SWIG对C++自定义类型进行包装，方便Lua函数调用。  
  
Lua.i文件，在vs里面右键属性页——》自定义生成步骤——》命令行输入swig -c++ -lua Lua\_I.i 编译就可以自定生成后缀是CXX的文件

头文件class.h

#pragma once
    
    
    class  MyClass
    {
    public:
        void    SetValueA(int iVlue);
        void    SetValueB(float fValue);
    
        int     GetValueInt(){ return m_iValueA; };
        float   GetVlaueFloat(){ return m_fValueB; };
    protected:
        
    private:
        int     m_iValueA;
        float   m_fValueB;
    };

源文件class.cpp

#include "stdafx.h"
    #include "class.h"
    
    
    void MyClass::SetValueA(int iVlue)
    {
        m_iValueA = iVlue;
    }
    
    void MyClass::SetValueB(float fVlue)
    {
        m_fValueB = fVlue;
    }

swig生成脚本lua\_i.i

%module Lua_Interface
    %{
        #include "Gobal.h"
    	#include "class.h"
    	#include "MainClass.h"
    	
    	#define  DEF_LuaPush(type)									\
    	void LuaPush(lua_State *L, type *Ptr)						\
    	{															\
    		SWIG_NewPointerObj(L, Ptr, SWIGTYPE_p_##type, 0);		\
    	}
    
    	DEF_LuaPush(MyClass)
    	DEF_LuaPush(ComputeClass)
    	
    	#define DEF_LuaToUserData(type)                             \
    	void LuaToUserData(lua_State *L, int index, type **Ptr)		\
    	{															\
    		SWIG_Lua_ConvertPtr(L, index, (void**)Ptr, SWIGTYPE_p_##type, 0);\
    	}
    	
    	DEF_LuaToUserData(MyClass)
    	DEF_LuaToUserData(ComputeClass)
    %}
    
    class  MyClass
    {
    public:
        void    SetValueA(int iVlue);
        void    SetValueB(float fValue);
    
        int     GetValueInt(){ return m_iValueA; };
        float   GetVlaueFloat(){ return m_fValueB; };
    };
    
    class ComputeClass
    {
    public:
        int ComputeAdd(MyClass& MyClassA, MyClass& MyClassB);
        void ShowResult(int iValue);
        MyClass*    GetMyClassPtr();
    };

测试类文件testclass.h

#pragma once
    #include "class.h"
    //class MyClass;
    
    class ComputeClass
    {
    public:
        ComputeClass();
        int         ComputeAdd(MyClass& MyClassA, MyClass& MyClassB);
        void        ShowResult(int iValue);
        MyClass*    GetMyClassPtr(){ return &m_MyClass; };
        MyClass     m_MyClass;
    };

测试类文件testclass.cpp

#include "stdafx.h"
    #include "MainClass.h"
    #include "class.h"
    #include <iostream>
    
    using namespace std;
    
    ComputeClass::ComputeClass()
    {
        m_MyClass.SetValueA(10101);
        m_MyClass.SetValueB(20202.02);
    }
    
    int ComputeClass::ComputeAdd(MyClass& MyClassA, MyClass& MyClassB)
    {
        return MyClassA.GetValueInt() + MyClassB.GetValueInt();
    }
    
    void ComputeClass::ShowResult(int iValue)
    {
        cout<<"输出结果值："<<iValue<<endl;
    }

main.cpp

// LuaTest.cpp : 定义控制台应用程序的入口点。
    //
    
    #include<stdio.h>
    #include<iostream>
    
    using namespace std;
    #include "I_LuaScript.h"
    #include "Gobal.h"
    #include "class.h"
    #include "MainClass.h"
    
    #ifdef __cplusplus
    extern "C" {
    #endif
        int luaopen_Lua_Interface(lua_State* L);
    #ifdef __cplusplus
    }
    #endif
    
    #include "stdafx.h"
    #include "../lua/luaScript.h"
    
    
    #include "LuaPush.h"
    
    int _tmain(int argc, _TCHAR* argv[])
    {
        char Incchar;
        int IncInt = 2;
        CLuaScript::CreateNew();
        //swig初始化
        luaopen_Lua_Interface(LuaScript()->GetHandle());
    
        LuaScript()->LoadFile("ScriptTest.lua");
    
        MyClass my1;
        MyClass my2;
        ComputeClass* pCompute = NULL;
        MyClass* pMyClass = NULL;
    
        my1.SetValueA(666);
        my1.SetValueB(33.22);
    
    
        my2.SetValueA(888);
        my2.SetValueB(22.22);
    
        ComputeClass cmp;
        cmp.m_MyClass.SetValueA(7878);
        cmp.m_MyClass.SetValueB(66.88);
    
        //system("PAUSE");
    
        while (cin>>IncInt && IncInt!= 0)
        {
            if (IncInt == 1)
            {
                if(LuaScript()->HasLuaFunc("ComputeValue"))	
                {
                    CallLuaFunc("ComputeValue",&my1, &my2, &cmp);
                }
            }
            else if (IncInt == 2)
            {
                if(LuaScript()->HasLuaFunc("TestPrintd"))	
                {
                    CallLuaFunc("TestPrintd",&my1, &my2, &cmp);
                }
            }
            else if (IncInt == 888)
            {
                LuaScript()->LoadFile("ScriptTest.lua");
            }
            else if (IncInt == 3)
            {
                if(LuaScript()->HasLuaFunc("ComputePrintd"))	
                {
                    CallLuaFunc("ComputePrintd",&my1, &my2, &cmp);
                }
            }
            else if (IncInt == 4)
            {
                if(LuaScript()->HasLuaFunc("TestPrintdValue"))	
                {
                    CallLuaFunc("TestPrintdValue",IncInt);
                }
            }
            else if (IncInt == 5)
            {
                if(LuaScript()->HasLuaFunc("TestGetPtr"))	
                {
                    CallLuaFunc("TestGetPtr",&cmp);
                }
            }
            else if (IncInt == 6)
            {
                if(LuaScript()->HasLuaFunc("TestReturnPtr"))	
                {
                    CallScriptFunc_1I_Ret1I("TestReturnPtr",&cmp, &pCompute);
                    if (pCompute != NULL)
                    {
                        cout<<"Lua函数返回指针对象输出GetValueInt()："<<pCompute->GetMyClassPtr()->GetValueInt()<<endl;
                    }
                }
            }
            else if (IncInt == 7)
            {
                if(LuaScript()->HasLuaFunc("TestReturnProcessPtr"))	
                {
                    CallScriptFunc_1I_Ret1I("TestReturnProcessPtr",&my1, &pMyClass);
                    if (pMyClass != NULL)
                    {
                        cout<<"Lua函数返回修改过的指针对象输出GetValueInt()："<<pMyClass->GetValueInt()<<endl;
                    }
                }
            }
        }
    
       
        CLuaScript::ReleaseLuaScript();
    
    	return 0;
    }

根据生成的CXX文件函数生命Luapush.h

#pragma once
    
    #include "I_LuaScript.h"
    
    #define  PROTO_LuaPush(type)		class type; void LuaPush(lua_State *L, type *Ptr);
    PROTO_LuaPush(MyClass)
    PROTO_LuaPush(ComputeClass)
    
    
    #define  PROTO_LuaToUserData(type)		class type; void LuaToUserData(lua_State *L, int index, type **Ptr);
    PROTO_LuaToUserData(MyClass)
    PROTO_LuaToUserData(ComputeClass)

未完待续