达到XML简单的动态配置

今天写的XML相关内容：随着上述眼前的小项目（等级类别）由于地图每个级别。因此，让他动态读取XML内容，这样的变化只能看到XML档。

简单的想法：第一次使用UserDefault类写入文件

UserDefault::getInstance()->setStringForKey("ID","2");
	std::string value = UserDefault::getInstance()->getStringForKey("ID");
	log("UserDefault: ID  = %s",value.c_str());

这种话在 proj.win32Debug.win32以下生成的 UserDefault.xml 文件里的内容是：

以后仅仅要过关就向这个文件里写入下一关的 ID就能够了，而关卡的信息在以下的 config.xml中，   注意相应的ID

config.xml:

 <Root>
		<Stage ID = "1">
			<name>map01.tmx</name>
			<property1 one = "256" two = "168" three = "visSize.width/4" />
			<property2 one = "480" two = "168" three = "visSize.width/17.1" />
			<property3 one = "704" two = "168" three = "visSize.width/4" />
			<property4 one = "144" two = "294" three = "visSize.width/3.5" />
			<property5 one = "480" two = "294" three = "visSize.width/5.5" />
			<property6 one = "816" two = "296" three = "visSize.width/3.4" />
			<property7 one = "320" two = "424" three = "visSize.width/8" />
			<property8 one = "672" two = "424" three = "visSize.width/8" />
		</Stage>
		<Stage ID = "2">
			<name>map02.tmx</name>
			<property1 one = "256" two = "168" three = "visSize.width/4" />
			<property2 one = "480" two = "168" three = "visSize.width/17.1" />
			<property3 one = "704" two = "168" three = "visSize.width/4" />
			<property4 one = "144" two = "294" three = "visSize.width/3.5" />
			<property5 one = "480" two = "294" three = "visSize.width/5.5" />
			<property5 one = "816" two = "296" three = "visSize.width/3.4" />
			<property5 one = "320" two = "424" three = "visSize.width/8" />
			<property5 one = "672" two = "424" three = "visSize.width/8" />
		</Stage>
		<Stage ID = "3">
			<name>map01.tmx</name>
			<property4 one = "144" two = "294" three = "visSize.width/3.5" />
			<property5 one = "480" two = "294" three = "visSize.width/5.5" />
			<property6 one = "816" two = "296" three = "visSize.width/3.4" />
			<property7 one = "320" two = "424" three = "visSize.width/8" />
			<property8 one = "672" two = "424" three = "visSize.width/8" />
		</Stage>
		<Stage ID = "4">
			<name>map02.tmx</name>
			<property1 one = "256" two = "168" three = "visSize.width/4" />
			<property2 one = "480" two = "168" three = "visSize.width/17.1" />
			<property3 one = "704" two = "168" three = "visSize.width/4" />
			
		</Stage>
 </Root>

这些数据就是 每关地图的信息，依据须要自己能够配置。

以下我们就依据 UserDefault.xml 中的 ID 来 找到 config.xml 中相应的 关卡信息。！！

新建 一个场景吧。

。

。

.h文件

#pragma once

#include "cocos2d.h"
#include "tinyxml2/tinyxml2.h"

using namespace cocos2d;
using namespace tinyxml2;


class One:public Scene{
public:
	virtual bool init();
	CREATE_FUNC(One);
	static Scene *createScene();

	XMLElement *Stage;
	std::string ID;

	void addGround(int posX,int posY,int width);
};

.cpp文件：

#include "One.h"
#include "Two.h"

Scene *One::createScene(){
	Scene *scene = Scene::create();
	auto layer = One::create();
	scene->addChild(layer);
	return scene;
}

bool One::init(){
	if (!Scene::initWithPhysics())
	{
		return false;
	}
	//可视区的大小
	 Size visSize = Director::getInstance()->getVisibleSize();
	 //显示边框,凝视了就不显示了
	 this->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);


	UserDefault::getInstance()->setStringForKey("ID","2");//这里运行一次就ok了，生成文件就好了
	std::string value = UserDefault::getInstance()->getStringForKey("ID");
	log("UserDefault: ID  = %s",value.c_str());
	//找到文件
	auto xmlFileName = FileUtils::getInstance()->fullPathForFilename("config.xml");//得到文件的位置  
	log("%s",xmlFileName.c_str());//验证是否正确  
	
	//创建解析器
	tinyxml2::XMLDocument doc;

	doc.LoadFile(xmlFileName.c_str());//将文件盒解析器。
。
 
	//获取根节点
	XMLElement *root = doc.RootElement();
	//
	XMLElement *stage = root->FirstChildElement();

	while (stage!=nullptr){
		auto id = stage->Attribute("ID");
		if (id == value){
			ID = id;
			Stage = stage;
		}
		stage = stage->NextSiblingElement();
	}
	//获取名字节点
	XMLElement *name = Stage->FirstChildElement();
	//获取名字节点的内容
	auto content = name->GetText();
	name = name->NextSiblingElement();
	log("%s",content);
	while (name!=nullptr){
		//获取属性节点(位置)
		auto one = name->Attribute("one");
		auto two = name->Attribute("two");
		auto three = name->Attribute("three");
		log("%s,%s,%s",one,two,three);

		//画线
		float _one = atof(one);
		float _two = atof(two);
		float _three = atof(three);
		addGround(_one,_two,200);  //这里的数据自己填写

		name = name->NextSiblingElement();
	}
	return true;
}

void One::addGround(int posX,int posY,int width){		//加入地板
	//加入地板
	auto ground = Sprite::create();//就是一个精灵
	ground->setPhysicsBody(PhysicsBody::createBox(Size(width,3)));
	ground->setTextureRect(Rect(0,0,width,3));//设置纹理的 宽 高
	ground->setPosition(Vec2(posX,posY));//设置地板的 位置 
	ground->getPhysicsBody()->setDynamic(false);
	this->addChild(ground);
}

这样就好了，仅仅要你想读取哪一个关卡的信息 就直接在 UserDefault.xml中改动 ID即可了。假设想配置关卡的信息。直接 改动 config.xml文件即可了！感觉这样会略微省事一点，假设哪里不正确请吐槽，一起学习进步，谢谢！

执行界面例如以下：

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