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C++实现对lua访问的封装
这是一个几年前写的对lua的访问封装,当时的项目仅提供了最基本的lua访问接口:调用lua函数,向lua注册标准格式的C++函数.
本来我想引进luabind,但luabind相对又过于复杂,并不是所有功能都是我需要的,并且还要为此引入庞大boost.最终还是决定
按需求编写一个简单的封装库.
首先简单列一下我的需求:
1)可以注册任意类型的C++函数到lua中
2)可以方便的调用lua函数,方便的访问lua中的表
3)可以访问lua中创建的对象,调用lua对象提供的方法
4)注册C++类型到lua,使lua可以访问C++对象的字段,和函数
下面介绍一下提供的一些API:
1)call_luaFunction,用于方便的调用lua函数,使用格式如下:
int ret = call_luaFunction<int>("funname",L);
2)register_function,用于向lua注册任意类型的C++函数,例如有如下函数:
static int showmsg(const char *msg)
{
printf("%s\n",msg);
return 0;
}
3)register_class,register_property,register_member_function用于向lua注册一个C++类型
4)luaObject,代表lua中的对象,可以通过成员函数CallMemberFunction,SetMemberValue,GetMemberValue
访问lua对象的方法和成员变量
5)luatable,代表lua中的表
6)Interger64用以支持在lua中实现64位整型运算
这里说明一下,我不想C++对象在lua中被创建,而只能在C++中创建再传递给lua(Interger64是个例外,因为它主要是在lua中被使用的类型),所以register_class
并没有提供构造函数的注册.
测试代码:
1 #include "luaWrapper.h" 2 #include <stdio.h> 3 4 static int userdata(lua_State *L) 5 { 6 int *a = (int*)lua_touserdata(L,-1); 7 printf("a = %d\n",*a); 8 return 0; 9 } 10 static int showmsg(const char *msg) 11 { 12 printf("%s\n",msg); 13 return 0; 14 } 15 16 class testa 17 { 18 public: 19 int vala; 20 int valb[10]; 21 }; 22 23 class testd 24 { 25 public: 26 virtual void testdf(){} 27 int vald; 28 }; 29 30 class testb : virtual public testa,virtual public testd 31 { 32 public: 33 34 virtual void function() 35 { 36 printf("this is function\n"); 37 } 38 39 int64_t valb; 40 double vald; 41 }; 42 43 class testc : public testb 44 { 45 public: 46 void function() 47 { 48 printf("this is testc\n"); 49 } 50 51 void functionc() 52 { 53 printf("functionc\n"); 54 } 55 }; 56 57 int main() 58 { 59 luaWrapper lw; 60 lw.init(); 61 lw.load("start.lua"); 62 lua_State *L = *(&lw); 63 //测试注册任意C++函数 64 register_function(L,"show",showmsg); 65 66 //测试向lua注册C++类 67 register_class<testb>(L,"testb"); 68 register_property("valb",&testb::valb); 69 register_property("vald",&testb::vald); 70 register_member_function("func",&testb::function); 71 72 register_class<testc,testb>(L,"testc"); 73 register_member_function("funcc",&testc::functionc); 74 75 testc tc; 76 tc.valb = 1000000000000000002; 77 tc.vald = 10.0f; 78 testb tb; 79 tb.valb = 1000; 80 call_luaFunction<void>("test1",L,&tc,(int64_t)1000000000000000001); 81 printf("%lld\n",tc.valb); 82 printf("%f\n",tc.vald); 83 84 luatable ret = call_luaFunction<luatable>("test2",L); 85 int i=0; 86 printf("{"); 87 for(;i<ret.size();++i) 88 { 89 printf("%d,",any_cast<int>(ret[i])); 90 } 91 printf("}\n"); 92 93 lua_results<5> ret1 = call_luaFunction<lua_results<5>>("test4",L); 94 printf("{"); 95 for(i=0;i<ret1._rets.size();++i) 96 { 97 printf("%d,",any_cast<int>(ret1._rets[i])); 98 } 99 printf("}\n"); 100 101 luaObject ac = call_luaFunction<luaObject>("test3",L);102 ac.CallMemberFunction<void>("show");103 printf("balance:%d\n",ac.GetMemberValue<int>("balance"));104 ac.SetMemberValue<int>("balance",1000);105 printf("balance:%d\n",ac.GetMemberValue<int>("balance"));106 luatable lt_in;107 for(int i = 0; i < 5;++i)108 lt_in.push_back(i);109 call_luaFunction<void>("test5",L,lt_in);110 111 call_luaFunction<void>("test6",L,"this is string"); 112 113 lt_in.clear();114 lt_in.push_back((const char*)"hello1");115 lt_in.push_back((const char*)"hello2");116 lt_in.push_back((const char*)"hello3");117 lt_in.push_back((const char*)"hello4");118 lt_in.push_back((const char*)"hello5");119 call_luaFunction<void>("test5",L,lt_in);120 getchar();121 return 0;122 }
1 Account = { 2 balance = 10, 3 names=0, 4 } 5 6 7 function Account:withdraw (v) 8 self.balance = self.balance - v 9 end10 11 function Account:new (o)12 o = o or {} 13 setmetatable(o, self)14 self.__index = self15 return o16 end17 18 function Account:show()19 print("this is account show")20 end21 22 function Account:getBalance()23 return self.balance24 end25 26 function Account:setBalance(val)27 self.balance = val28 end29 30 function t(tb)31 tb:func()32 end33 34 function test1(tb,i)35 t(tb)36 show("hello world")37 print(tb.valb)38 tb.valb = i64:new(10000003) 39 tb.vald = 1000.240 print(i)41 end42 43 function test2()44 return {1,2,3,4,5}45 end46 47 function test3()48 account = Account:new();49 account.balance = 10050 account.name = "sniperHW"51 return account52 end53 54 function test4()55 return 1,2,3,4,556 end57 58 function test5(lt)59 print(lt[1])60 print(lt[2])61 print(lt[3])62 print(lt[4])63 print(lt[5])64 end65 66 function test6(str)67 print(str)68 end
C++实现对lua访问的封装