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?<将简单C++类导出到lua> ??? 利用tolua++导出类到lua中简单方便，你可以导出静态成员函数、普通成员函数、静态成员变量、普通成员变量，你也可以指定类的哪些方法被导出。你可以将具有单继承的派生类导出，派生类可以很自然地访问基类的方法。更多的细节，请参考
tolua++的在线文档。 ??? 首先生成实际的c++头文件，定义我们要导出的类。tclass.h内容如下：
#ifndef?_TESTCLASS_H
#define
?_TESTCLASS_H
#include?
<
string
.h
>
class
?CNumber
...
{?//tolua_export
public:
????tolua_begin????CNumber():m_nNum(0) 
????...{
????}
????CNumber(int?num):m_nNum(num) 
????...{
????}
????
????~CNumber() 
????...
????void?SetNumber(?num) 
????...{
????????m_nNum?=?num;
????}?GetNumber() 
????...{
????????return?m_nNum;
????}?Add(?num) 
????...+=?num;
????????tolua_end????protected?m_nNum;
}
;
//
tolua_export
tolua_begin
?CMessage 
...
{
tolua_end????CMessage() 
????...{
????????strcpy(m_szMessage,?"initial?message);
????}
????CMessage(char?*initmsg) 
????...if(initmsg)
????????????strncpy(m_szMessage,?initmsg,0);">256CMessage() 
????...?SetMessage(msg) 
????...(msg) 
????????...{
????????????strncpy(m_szMessage,?msg,0);">);
????????}
????}GetMessage() 
????...?m_szMessage;
????}?ShowMessage() 
????...{
????????printf(this?message?is?printed?in?c++?code?when?lua?call?ShowMessage:%s ,?m_szMessage);
????}?m_szMessage[];
}
tolua_export
#endif
??? 为了方便，我把实现也放在了头文件中。 ??? 接下来定义pkg文件，tclass.pkg。
$#include?
"
tclass.h
...
????CNumber();
????CNumber(?num);
????CNumber();
?????GetNumber(
}
?CMessage 
...
????CMessage();
????CMessage(?initmsg);
????CMessage(msg);
????GetMessage();
?????ShowMessage();
????tolua_export
????tolua
++
.exe?
-
n?tclass?
o?tclass.cpp?tclass.pkg
??? 把tclass.h和tclass.cpp加入到工程中。编写驱动代码，调用lua脚本文件。这部分如下：
#include?
lua.hpp
#include?
int
?tolua_tclass_open(lua_State?
*
);
?_tmain(
?argc,?_TCHAR
?argv[]) 
...
{
????lua_State?L??luaL_newstate();
????luaopen_base(L);
????tolua_tclass_open(L);
????luaL_dofile(L,0);">../scripts/classtest.lua);
????lua_close(L);
????;
}
print(
now?in?classtest.lua!
)
--
new
?a?CNumber?Object
print(
now?allocate?a?CNumber?Object:
)
num
=
CNumber:
()
num2
(
222
)
print(
init,?num:?
..num:GetNumber())
print(
..num2:GetNumber())
print(
now?call?SetNumber(6)
)
num:SetNumber(
6
now?the?num:
..num:GetNumber());
num:delete()
print(
num?is?deleted,?access?GetNumber?is?invalid!
invalid?call,?result:?
..num:GetNumber())
?a?CMessage?Object
msg
CMessage:
()
print(
init?msg:?
..msg:GetMessage())
print(
now?change?the?msg?by?call?msg:SetMessage('changed?message')
)
msg:SetMessage(
changed?message
now?msg:?
..msg:GetMessage())
msg:ShowMessage()
msg:delete()
print(
msg?is?deleted,?access?GetMessage?is?invalid!
inivalid?call,0);">..msg:GetMessage())
（编辑：李大同）
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