js call c++
0.声明
TT命名空间 类名test
1.创建一个 2dx 的 js 项目。
2.新创建一个 jsbRegister.cpp 文件，jsbRegister.h文件中声明一个全局方法。
#include <iostream>
#include "jsapi.h"
#include "jsfriendapi.h"
#include "ScriptingCore.h"
#include "test.h"
void register_jsb(JSContext* cx,JSObject* obj);
3. 2dx 的 AppDelegate.cpp 中引进头文件，jsbRegister.h
ScriptingCore* sc = ScriptingCore::getInstance();
sc->addRegisterCallback(register_jsb);
sc->start();
4. jsbRegister.cpp 去实现这个方法
#include "jsbRegister.h"
#include "cocos2d.h"
#include "cocos2d_specifics.hpp"
JSClass* jsb_class;//全局变量
JSObject* jsb_prototype;
void register_jsb(JSContext* cx, JSObject* obj)//注册：全局函数
{
jsval nsval;
JSObject* ns;
JS_GetProperty(cx, obj, "TT", &nsval);//c++ 命名空间绑定
if (nsval == JSVAL_VOID)
{
ns = JS_NewObject(cx, NULL, NULL, NULL);
nsval = OBJECT_TO_JSVAL(ns);
JS_SetProperty(cx, obj, "TT", &nsval);//命名空间绑定
}else
{
JS_ValueToObject(cx, nsval, &ns);
}
obj = ns;
js_register(cx, obj); //调用：绑定类的方法
//JS_DefineFunction：调用全局方法
JS_DefineFunction(cx, jsb_prototype, "retain", JSB_cocos2dx_retain, 0, JSPROP_READONLY | JSPROP_PERMANENT);
JS_DefineFunction(cx, jsb_prototype, "release", JSB_cocos2dx_release, 0, JSPROP_READONLY | JSPROP_PERMANENT);
}
js_register(cx, obj); 全局方法，创建 c++ 类的对象。
JS_DefineFunction(cx, jsb_prototype,"retain", JSB_cocos2dx_retain,0, JSPROP_READONLY |JSPROP_PERMANENT);
通过 js 对象调用 retain 方法可以执行 c++ 全局方法 JSB_cocos2dx_retain
var testJSB = new TT.test();//创建 js 绑定的 c++对象
testJSB.retain();
testJSB.release();//retain时候调用
JSBool JSB_cocos2dx_retain(JSContext* cx, uint32_t argc, jsval *vp)
{
CCLog("JSB_cocos2dx_retain ---------- JSB_cocos2dx_retain");
JSObject* thisObj = JS_THIS_OBJECT(cx, vp);
if (thisObj)
{
js_proxy_t* proxy = jsb_get_js_proxy(thisObj);//2dx
if (proxy)
{
((CCObject* )proxy->ptr)->retain();
CCLog("Retain succeed!");
return JS_TRUE;
}
}
JS_ReportError(cx, "Invaild native object");
return JS_FALSE;
}
//释放内存调用
JSBool JSB_cocos2dx_release(JSContext* cx, uint32_t argc, jsval *vp)
{
CCLog("JSB_cocos2dx_release ---------- JSB_cocos2dx_release");
JSObject* thisObj = JS_THIS_OBJECT(cx, vp);
if (thisObj)
{
js_proxy_t* proxy = jsb_get_js_proxy(thisObj);
if (proxy)
{
((CCObject* )proxy->ptr)->release();
CCLog("Release succeed!");
return JS_TRUE;
}
}
JS_ReportError(cx, "Invaild native object");
return JS_FALSE;
}
5.jsbRegister.cpp js绑定c++对象方法
//注册 一些可能被调用的函数
void js_register(JSContext* cx, JSObject* global)
{
CCLog("js_register ---------- js_register");
jsb_class = (JSClass *)calloc(1, sizeof(JSClass));
jsb_class->name = "test";//类名
jsb_class->addProperty = JS_PropertyStub;
jsb_class->delProperty = JS_PropertyStub;
jsb_class->getProperty = JS_PropertyStub;
jsb_class->setProperty = JS_StrictPropertyStub;
jsb_class->enumerate = JS_EnumerateStub;
jsb_class->resolve = JS_ResolveStub;
jsb_class->convert = JS_ConvertStub;
jsb_class->finalize = js_finalize;//类型析构函数绑定
jsb_class->flags = JSCLASS_HAS_RESERVED_SLOTS(2);
/*
等呆研究
*/
static JSPropertySpec properties[] =
{
{0, 0, 0, JSOP_NULLWRAPPER, JSOP_NULLWRAPPER}
};
/*
js 调用 functionTest 方法触发 js_functionTest
*/
static JSFunctionSpec funcs[] =
{
JS_FN("functionTest", js_functionTest, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE),
JS_FS_END
};
/*
js 调用 create 方法触发 js_create
*/
static JSFunctionSpec st_funcs[] =
{
JS_FN("create", js_create, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE),
JS_FS_END
};
/*
JS_InitClass：调用对象方法
1：js_constructor 创建类对象注册到 js
2：funcs 注册 js 调用的对象方法
3：st_funcs 注册 js 调用的静态方法
4：properties (可能是注册属性 猜测)
*/
jsb_prototype = JS_InitClass(cx, global, NULL, jsb_class, js_constructor, 0, properties, funcs, NULL, st_funcs);
JSBool found;
JS_SetPropertyAttributes(cx, global, "TT", JSPROP_ENUMERATE | JSPROP_READONLY, &found);//命名空间
TypeTest<TT::test> t;//对象
js_type_class_t* p;
uint32_t typeId = t.s_id();//次类对象的唯一标示符
HASH_FIND_INT(_js_global_type_ht, &typeId, p);
if (!p)//绑定对象和方法到 js 上
{
p = (js_type_class_t* )malloc(sizeof(_js_global_type_ht));
p->type = typeId;
p->jsclass = jsb_class;
p->proto = jsb_prototype;
p->parentProto = NULL;
HASH_ADD_INT(_js_global_type_ht, type, p);
}
}
void js_finalize(JSFreeOp* fop,JSObject* obj)//一直没有被成功调用过 ？？？
{
CCLog("js_finalize ---------- js_finalize");
CCLOGINFO("JSBindings: finallizing JS object %p JSB", obj);
}
JS_InitClass(cx, global, NULL,jsb_class, js_constructor, 0, properties, funcs, NULL, st_funcs);
var testJSB = new TT.test(); new 时候调用 js_constructor 全局方法
var testJSB = TT.test.create(); 调用 js_create
testJSB.functionTest();调用 js_functionTest
6.jsbRegister 两张在 js绑定中创建 c++ 对象
//new创建类对象，并绑定到js
JSBool js_constructor(JSContext* cx, uint32_t argc, jsval* vp)
{
cocos2d::CCLog("JS Constructor...");
if (argc == 0)
{
TT::test* cobj = new TT::test();//创建注册到 js中 类的对象
cocos2d::CCObject* ccobj = dynamic_cast<cocos2d::CCObject*>(cobj);
if (ccobj) ccobj->autorelease();//2dx 创建对象以后就直接 autorelease
TypeTest<TT::test> t;
js_type_class_t* typeClass;
uint32_t typeId = t.s_id();
HASH_FIND_INT(_js_global_type_ht, &typeId, typeClass);
assert(typeClass);
JSObject* obj = JS_NewObject(cx, typeClass->jsclass, typeClass->proto, typeClass->parentProto);
JS_SET_RVAL(cx, vp, OBJECT_TO_JSVAL(obj));
js_proxy_t* p = jsb_new_proxy(cobj, obj);//2dx
JS_AddNamedObjectRoot(cx, &p->obj, "TT::test");//
return JS_TRUE;
}
JS_ReportError(cx, "Wrong number of arguments: %d, was expecting: %d", argc, 0);
return JS_FALSE;
}
//create创建对象时候调用
JSBool js_create(JSContext* cx, uint32_t argc, jsval* vp)
{
cocos2d::CCLog("js is creating...");
if (argc == 0)
{
TT::test* ret = TT::test::create();
jsval jsret;
do
{
if (ret)
{
js_proxy_t* proxy = js_get_or_create_proxy<TT::test>(cx, ret);
jsret = OBJECT_TO_JSVAL(proxy->obj);
}else
{
jsret = JSVAL_NULL;
}
} while(0);
JS_SET_RVAL(cx, vp, jsret);
return JS_FALSE;
}
JS_ReportError(cx, "Wrong number of arguments");
return JS_FALSE;
}
7. js 通过 jsb 调用 c++的对象方法
通过前面的注册，可以用 js 去调用 c++ 的全局方法，js_functionTest 在前面 js_register 被注册过了。
var testJSB = new TT.test();
testJSB.functionTest(); 先调用 jsb方法 functionTest 在通过前面的注册调用c++方法
//调用JSBinding 里的 functionTest 方法
JSBool js_functionTest(JSContext* cx, uint32_t argc, jsval* vp)
{
CCLog("js_functionTest --- js_functionTest");
JSBool ok = JS_TRUE;
JSObject* obj = NULL;
TT::test* cobj = NULL;
obj = JS_THIS_OBJECT(cx, vp);
js_proxy_t* proxy = jsb_get_js_proxy(obj);//2dx
cobj = (TT::test* )(proxy ? proxy->ptr : NULL);//通过代理得到自己创建的那个类的对象
JSB_PRECONDITION2(cobj, cx, JS_FALSE, "Invalid Native Object");
if (argc == 0)
{
cobj->functionTest();//调用 TT::test 类对象方法
JS_SET_RVAL(cx, vp, JSVAL_VOID);
return ok;
}
JS_ReportError(cx, "Wrong number of arguments");
return JS_FALSE;
}
8.自己的 c++类
test.h
#ifndef __myJSB__test__
#define __myJSB__test__
#include <iostream>
#include "cocos2d.h"
#include "ScriptingCore.h"
namespace TT
{
class test: public cocos2d::CCObject
{
public:
static cocos2d::CCScene* scene();
test();
~test();
virtual bool init();
CREATE_FUNC(test);
void functionTest();
};
}
#endif
test.cpp
#include "test.h"
bool TT::test::init()
{
bool bRef = false;
do
{
cocos2d::CCLog("TT::test init...");
bRef = true;
} while (0);
return bRef;
}
void TT::test::functionTest()
{
cocos2d::CCLog("TT::test test...");
}
TT::test::test(){}
TT::test::~test()// js执行对象 release方法时候调用
{
CCLog("~test");
}