How call member function in non member function in Own Class?

cocos2d-x C++
1

Hello everyone i want to call member function in non member function in Own class without object in C++?
for example in HelloWorldScene.cpp

 void non_MemberFunc()
{
 MemberFunc();
 //How Run MemberFunc without object?
 }

  void  HelloWorldScene::MemberFunc()
  {
     //do somthing
  }
    bool HelloWorldScene::init()
   {
         //code
   }
2

You can define your function as static…
e.g.: in your HelloWorldScene.h you define:

static void non_MemberFunc();

Obviously you have to implement the function in HelloWorldScene.cpp:

void HelloWorld::non_MemberFunc() {
    CCLOG("i am a fancy static function");
}

bool HelloWorldScene::init() {
    HelloWorld::non_MemberFunc();
}

Hope this helps :wink:

3

He wants to do the opposite.

You can’t do that, as a member function always needs an object.

1 Like
4

Oh, sorry - I misread what he wanted.

@iQD you are right, this isn’t possible.

5

I don’t even get, why creating an object would be a problem for @maleking.
Why you don’t want/are able to create an object?

6

Thank you for responding
I use socket programming with JNI in my multiplayer game
in my game ,Server send a string to clients and in Java side clients get string and call C++ non static function but My problem is that in non static function i can’t Update UI
for example i have Deck class for create multiple card but when i create object in non-static function and Java Side call this function the sprite getting Black (i dont know why this happens)
is there any solution for my problem?

7

I think the problem is that your JNI is calling your method from another thread, try running it in cocos main thread instead.

8

Whats your mean about "JNI calling your method from another thread "?
Can you tell me more detail ?

9

I meant the method you are calling in Java, on what thread is it called ? is it on main thread ?

10

i search for this but still i have no idea that what is Main Thread in cocos2d-x and How i call this ?
HelloWorldScene.cpp

JNIEXPORT void JNICALL Java_org_cocos2dx_cpp_AppActivity_Receive(JNIEnv* env,
		jobject thiz, jstring jstr) {
const char* str = env->GetStringUTFChars(jstr, NULL);//get String from Server
    if(str=="play")//if Server send "play" string run a CCaction  on sprite 
  {
 Deck *deck=new Deck(thisclass_layer);
 deck->play();
   }
 }

  void  HelloWorldScene::MemberFunc()
  {
     //do somthing
  }
    bool HelloWorldScene::init()
   {
         //code
   }

Deck.h

    Deck::Deck(cocos2d::Layer *layer) {
    
    	Size visibleSize = Director::getInstance()->getVisibleSize();
    	Vec2 origin = Director::getInstance()->getVisibleOrigin();
    	centerX = visibleSize.width / 2;
    	centerY = visibleSize.height / 2;
    	height = visibleSize.height + origin.y;
    	width = visibleSize.width;
    
    	p0 = Vec2(centerX, 10);
    	p1 = Vec2(10, centerY);
    	p2 = Vec2(centerX, height);
    	p3 = Vec2(width, centerY);
    
    
    
    	std::string str;
    	cocos2d::Sprite* mySprite;
    	auto spritecache = SpriteFrameCache::getInstance();
    
    	spritecache->addSpriteFramesWithFile("asset.plist");
    	for (int i = 0; i < 52; i++) {
    		str = to_string(i) + ".png";
    		mySprite = Sprite::createWithSpriteFrameName(str);
    		mySprite->setPosition(Vec2(150,150));
    
    		mySprite->setTag(cards[i]);
    		if (i % 4 == 0)
    			mySprite->setName("p0");
    
    		if (i % 4 == 1)
    
    			mySprite->setName("p1");
    
    		if (i % 4 == 2)
    
    			mySprite->setName("p2");
    
    		if (i % 4 == 3)
    
    			mySprite->setName("p3");
    
    		mySprite->setAnchorPoint(Vec2(0.5, 0.5));
    		_mySprites.insert(i, mySprite);
    		layer->addChild(mySprite,52-i);
    
    	}
    
    
    }
void Deck::Play() {
	actionFinished();

}
void Deck::Next() {
	if (counter < 52)
		counter += 1;

	switch (counter%4) {
	case 0:
		curPos = p0;
		curRotate=0;
		break;
	case 1:
		curPos = p1;
		curRotate=270;
		break;
	case 2:
		curPos = p2;
		curRotate=180;
		break;
	case 3:
		curPos = p3;
		curRotate=90;
		break;
	default:
		// Code
		break;
	}
}
void Deck::actionFinished() {
	if(counter==51)
			return;
	auto jump = JumpBy::create(0.5, Vec2(0, 0), 100, 1);

	RotateTo * rotate = RotateTo::create(0.2f, curRotate);
	auto moveBy = MoveTo::create(0.5, curPos);

	auto callbackJump = CallFunc::create([]() {
		log("Jumped!");
	});

	auto callbackRotate = CallFunc::create([]() {

		log("Rotated!");
	});
	CCCallFunc* startNext = CCCallFunc::create(this,
			callfunc_selector(Deck::actionFinished));


	auto actCallback = CallFunc::create(this,
			callfunc_selector(Deck::actionFinished));
	auto nextCallback = CallFunc::create(this, callfunc_selector(Deck::Next));

	auto seq = Sequence::create(jump, moveBy, rotate, nextCallback, actCallback,
			nullptr);

	_mySprites.at(counter)->runAction(seq);

	CCLOG("action completed!");

}