cocos2dx——lua自己主动和手动绑定
2024-08-31 17:30:04
【自己主动绑定】
參考:http://my.oschina.net/skyhacker2/blog/298397
主要是通过引擎自带的tools/tolua,主要过程例如以下:
1.编写好要导出的c++类。假设是libcocos2d里加入,须要加入导出标记:class CC_DLL Test
2.到tolua文件夹依据README.mdown配置好环境:
* Make sure that you have installed `android-ndk-r9b`.
* Download python2.7.3 (32bit) from (http://www.python.org/ftp/python/2.7.3/python-2.7.3.msi).
* Add the installed path of python (e.g. C:\Python27) to windows environment variable named 'PATH'.
* Download pyyaml from http://pyyaml.org/download/pyyaml/PyYAML-3.10.win32-py2.7.exe and install it.
* Download pyCheetah from https://raw.github.com/dumganhar/my_old_cocos2d-x_backup/download/downloads/Cheetah.zip, unzip it to "C:\Python27\Lib\site-packages"
* Set environment variables (`NDK_ROOT`)
* Go to "cocos2d-x/tools/tolua" folder, and run "genbindings.py". The generated codes will be under "cocos\scripting\auto-generated\js-bindings".
3.创建一个ini文件,比方cocos2dx_custom.ini,參照其它的ini自己做一些改动:
# the prefix to be added to the generated functions. You might or might not use this in your own
# templates
prefix = cocos2dx_custom # create a target namespace (in javascript, this would create some code like the equiv. to `ns = ns || {}`)
# all classes will be embedded in that namespace
target_namespace = cc # what headers to parse
headers = %(cocosdir)s/cocos/for_lua/Test.h # what classes to produce code for. You can use regular expressions here. When testing the regular
# expression, it will be enclosed in "^$", like this: "^Menu*$".
classes = Test.* skip = # classes for which there will be no "parent" lookup
classes_have_no_parents = Test abstract_classes =
4.拷贝一份genbindings_custom.py。改动cmd_args:
cmd_args = {'cocos2dx_custom.ini' : ('cocos2dx_custom', 'lua_cocos2dx_custom_auto'),\
}
5.执行genbindings_custom.py会生成xx_auto.h/cpp到cocos\scripting\lua-bindings\auto文件夹,然后你加入到引擎的libluacocos2dproject去
6.要在lua中使用,还在启动时注冊。如今3.7的版本号里AppDelegate::applicationDidFinishLaunching会调用lua_module_register,所以:
#include "lua_cocos2dx_custom_auto.hpp"
#include "fun.h" int lua_module_register(lua_State* L)
{
register_cocosdenshion_module(L);
register_all_cocos2dx_custom(L); register_foo(L); return 1;
}
7.然后你就能够在lua里使用了:
-- test custom
local msg = cc.Test:helloMsg()
print(msg)
【手动绑定】
參考:http://www.tairan.com/archives/5493
1.创建c++类(fun.h):
#pragma once #include <iostream>
#include <sstream> extern "C"
{
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
} class Foo
{
public:
Foo(const std::string & name) : name(name)
{
std::cout << "Foo is born" << std::endl;
} std::string Add(int a, int b)
{
std::stringstream ss;
ss << name << ": " << a << " + " << b << " = " << (a + b);
return ss.str();
} ~Foo()
{
std::cout << "Foo is gone" << std::endl;
} private:
std::string name;
}; void register_foo(lua_State *L);
2.导出到lua(fun.cpp):
#include "fun.h" int l_Foo_constructor(lua_State *L) {
const char *name = luaL_checkstring(L, 1);
Foo **udata = (Foo**)lua_newuserdata(L, sizeof(Foo*));
*udata = new Foo(name); luaL_getmetatable(L, "luaL_Foo");
// stack:
// -1 metatable "luaL_Foo"
// -2 userdata
// -3 string param
lua_setmetatable(L, -2); return 1;
} Foo* l_CheckFoo(lua_State *L, int n) {
return *(Foo**)luaL_checkudata(L, n, "luaL_Foo");
} int l_Foo_Add(lua_State *L) {
Foo *foo = l_CheckFoo(L, 1);
int a = luaL_checknumber(L, 2);
int b = luaL_checknumber(L, 3); std::string s = foo->Add(a, b);
lua_pushstring(L, s.c_str()); // stack:
// -1 result string
// -2 metatable "luaL_Foo"
// -3 userdata
// -4 string param return 1;
} int l_Foo_destructor(lua_State *L) {
Foo *foo = l_CheckFoo(L, 1);
delete foo; return 0;
} void register_foo(lua_State *L) {
luaL_Reg sFooRefs[] = {
{ "new", l_Foo_constructor },
{ "add", l_Foo_Add },
{ "__gc", l_Foo_destructor },
{ NULL, NULL }
}; luaL_newmetatable(L, "luaL_Foo");
luaL_register(L, NULL, sFooRefs);
lua_pushvalue(L, -1); // stack:
// -1: metatable "luaL_Foo"
// -2: metatable "luaL_Foo" // this pops the stack
lua_setfield(L, -1, "__index"); lua_setglobal(L, "Foo");
}
3.启动时注冊
4.在lua中使用:
function Foo:speak()
print("hello, i am a Foo")
end local foo = Foo.new("adfan")
local m = foo:add(3, 4)
print(m) foo:speak() Foo.add_ = Foo.add
function Foo:add(a, b)
return "magic: " .. self:add_(a, b)
end m = foo:add(9, 8)
print(m)
说明:手动绑定的话。參照引擎导出的那些manual.cpp就可以,用tolua的那些接口非常方便。用上面的这样的方式主要是展示这个流程
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