从Objective-C转战C++ Android平台开发实践，C++/Java

#define CCX_BREAK_IF(cond) if(cond) break;

#define CCX_SAFE_DELETE(p) if(p) {delete (p); (p) = NULL;}

// declaration

classCCar

{

public:

CCar();

boolinit();

virtual~CCar();

protected:

CEngine* m_pEngine;

boolm_bStarted;

boolm_bLocked;

};

// 1st-phase construction

// only set the default value & alloc memory

CCar::CCar()

:m_pEngine(newCEngine)

,m_bStarted(false)

,m_bLocked(true)

{

printf("CCar constructor\n");

}

// 2st-phase construction

// do logical initialization

boolCCar::init()

{

boolbRet =false;

do

{

m_bLocked =false;

CCX_BREAK_IF( !m_pEngine );// defensive

CCX_BREAK_IF( !m_pEngine->start() );// logic

// success

bRet =true;

}while(0);

printf("CCar init\n");

returnbRet;

}

// destruction

CCar::~CCar()

{

if(m_pEngine)

{

deletem_pEngine;

m_pEngine = NULL;

}

printf("CCar destructor\n");

}

// invoker

int_tmain(intargc, _TCHAR* argv[])

{

// in heap

CCar* pCar =newCCar;

if(!pCar->init())

{

CCX_SAFE_DELETE(pCar);

}

// in stack

CCar car;

if(!car.init())

{

// do sth.

}

return0;

}

/** CCX_PROPERTY_READONLY is used to declare a protected variable.

We can use get method to read the variable.

@param varType : the type of variable.

@param varName : variable name.

@param funName : "get + funName" is the name of the get method.

@warning : The get method is a public virtual function, you should override it first.

The variables and methods declared after CCX_PROPERTY_READONLY are all public.

If you need protected or private, please declare.

*/

#define CCX_PROPERTY_READONLY(varType, varName, funName)\

protected: varType varName;\

public:virtualvarType get##funName(void);

/** CCX_PROPERTY is used to declare a protected variable.

We can use get method to read the variable, and use the set method to change the variable.

@param varType : the type of variable.

@param varName : variable name.

@param funName : "get + funName" is the name of the get method.

"set + funName" is the name of the set method.

@warning : The get and set methods are public virtual functions, you should override them first.

The variables and methods declared after CCX_PROPERTY are all public.

If you need protected or private, please declare.

*/

#define CCX_PROPERTY(varType, varName, funName)\

protected: varType varName;\

public:virtualvarType get##funName(void);\

public:virtualvoidset##funName(varType var);

/** CCX_SYNTHESIZE_READONLY is used to declare a protected variable.

We can use get method to read the variable.

@param varType : the type of variable.

@param varName : variable name.

@param funName : "get + funName" is the name of the get method.

@warning : The get method is a public inline function.

The variables and methods declared after CCX_SYNTHESIZE_READONLY are all public.

If you need protected or private, please declare.

*/

#define CCX_SYNTHESIZE_READONLY(varType, varName, funName)\

protected: varType varName;\

public:inlinevarType get##funName(void){returnvarName; }

/** CCX_SYNTHESIZE is used to declare a protected variable.

We can use get method to read the variable, and use the set method to change the variable.

@param varType : the type of variable.

@param varName : variable name.

@param funName : "get + funName" is the name of the get method.

"set + funName" is the name of the set method.

@warning : The get and set methods are public inline functions.

The variables and methods declared after CCX_SYNTHESIZE are all public.

If you need protected or private, please declare.

*/

#define CCX_SYNTHESIZE(varType, varName, funName)\

protected: varType varName;\

public:inlinevarType get##funName(void){returnvarName; }\

public:inlinevoidset##funName(varType var){ varName = var; }

@interface CTest

-(id) foo();

classCTest

{

boolfoo();

}

#include "NDKHelper.h"

// The button click method of Cocos2dx

voidHelloWorld::menuCloseCallback(CCObject* pSender)

{

// Register a selector in a global space

// So that when our native environment will call the method with the string

// It can respond to the selector

// Note : Group name is there for ease of removing the selectors

NDKHelper::AddSelector("HelloWorldSelectors",

"SampleSelector",

callfuncND_selector(HelloWorld::SampleSelector),

this);

// Making parameters for message to be passed to native language

// For the ease of use, i am sending the method to be called name from C++

CCDictionary* prms = CCDictionary::create();

prms->setObject(CCString::create("SampleSelector"),"to_be_called");

// Finally call the native method in current environment

SendMessageWithParams(string("SampleSelector"), prms);

}

// A selector that will respond to us, when native language will call it

voidHelloWorld::SampleSelector(CCNode *sender,void*data)

{

CCLog("Called from native environment");

}

// Destructor to remove all the selectors which are grouped as HelloWorldSelectors

HelloWorld::~HelloWorld()

{

// Remove the associated selector group from the global space,

// Because we are destroying this instance

NDKHelper::RemoveSelectorsInGroup("HelloWorldSelectors");

}

/** Called when the activity is first created. */

publicvoidonCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

// In the main Activity, assigning that activity as a receiver for C++ messages

AndroidNDKHelper.SetNDKReciever(this);

}

// Implement the method to be called for a message from C++

// Be sure to name the method to be of the same string as you will pass from C++

// Like we passed "SampleSelector" from C++, that is why created this method

publicvoidSampleSelector(JSONObject prms)

{

Log.v("SampleSelector","purchase something called");

Log.v("SampleSelector","Passed params are : "+ prms.toString());

String CPPFunctionToBeCalled = null;

try

{

CPPFunctionToBeCalled = prms.getString("to_be_called");

}

catch(JSONException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

AlertDialog.Builder builder =newAlertDialog.Builder(this);

builder.setMessage("This is a sample popup on Android").

setTitle("Hello World!").

setNeutralButton("OK", null).show();

// Send C++ a message with paramerts

// C++ will recieve this message, only if the selector list will have a method

// with the string we are passing

AndroidNDKHelper.SendMessageWithParameters(CPPFunctionToBeCalled, null);

}