Cocos2d-x 读取网络图片创建精灵

来源：互联网发布：ps mac 破解版编辑：程序博客网时间：2024/04/30 03:36

Cocos2d-x 2.1.4 里面已经为我们提供了HttpRequest ，HttpClient，CCHttpResponse用于处理网络相关操作

下面简单利用这些封装好的类，来读取网络图片并创建精灵

1.在工程里面导入HttpRequest.h，HttpClient.h

#include "HelloWorldScene.h"#include "SimpleAudioEngine.h"#include "HttpRequest.h"#include "HttpClient.h"USING_NS_CC;USING_NS_CC_EXT;using namespace std;CCScene* HelloWorld::scene(){    CCScene *scene = CCScene::create();    HelloWorld *layer = HelloWorld::create();    scene->addChild(layer);    return scene;}// on "init" you need to initialize your instancebool HelloWorld::init(){    if ( !CCLayer::init() )    {        return false;    }    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(                                        "CloseNormal.png",                                        "CloseSelected.png",                                        this,                                        menu_selector(HelloWorld::menuCloseCallback) );    pCloseItem->setPosition( ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20) );    CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);    pMenu->setPosition( CCPointZero );    this->addChild(pMenu, 1);//  这是个静态方法，得到一个httpClient实例    CCHttpClient* httpClient = CCHttpClient::getInstance();//    创建一个CCHttpRequest对象    CCHttpRequest* httpReq =new CCHttpRequest();//    设置请求类型    httpReq->setRequestType(CCHttpRequest::kHttpGet);//  设置请求Url(可以更具需要从json 或xml,甚至html里解析获得到这个图片url)    httpReq->setUrl("http://avatar.csdn.net/A/6/5/1_qqxj2012.jpg");//    请求完成后回调    httpReq->setResponseCallback(this,callfuncND_selector(HelloWorld::onGetFinished));//   为请求设置标签,后面可以根据这个标签来获取我们要的数据    httpReq->setTag("PicGet");//    设置连接超时时间    httpClient->setTimeoutForConnect(30);    httpClient->send(httpReq);    httpReq->release();    httpReq=NULL;    return true;}void HelloWorld::onGetFinished(CCNode* node,CCObject* obj){    CCHttpResponse* response = (CCHttpResponse*)obj;//    判断是否响应成功    if (!response->isSucceed())    {        CCLog("Receive Error! %s\n",response->getErrorBuffer());        return ;    }        const char* tag = response->getHttpRequest()->getTag();    if (0 == strcmp("PicGet",tag))    {        vector<char> *data = response->getResponseData();        int data_length = data->size();        string res;        for (int i = 0;i<data_length;++i)        {            res+=(*data)[i];        }        res+='\0';        CCLog("%s",res.c_str());    }        // 数据转存    unsigned char* pBuffer = NULL;    unsigned long bufferSize = 0;    vector<char> *buffer = response->getResponseData();    string path = CCFileUtils::sharedFileUtils()->getWritablePath()+"test.png";    pBuffer = CCFileUtils::sharedFileUtils()->getFileData(path.c_str(), "r", &bufferSize);    string buff(buffer->begin(),buffer->end());        //保存到本地文件    CCLOG("path: %s",path.c_str());    FILE *fp = fopen(path.c_str(), "wb+");    fwrite(buff.c_str(), 1,buffer->size(),  fp);    fclose(fp);    }void HelloWorld::menuCloseCallback(CCObject* pSender){    unsigned char* pBuffer = NULL;    unsigned long bufferSize = 0;    string path = CCFileUtils::sharedFileUtils()->getWritablePath()+"test.png";    pBuffer = CCFileUtils::sharedFileUtils()->getFileData(path.c_str(), "r", &bufferSize);    if (!pBuffer)    {        return ;    }    CCImage* img = new CCImage;    img->initWithImageData(pBuffer,bufferSize);    free(pBuffer);    CCTexture2D* texture = new cocos2d::CCTexture2D();    bool isImg = texture->initWithImage(img);    img->release();    if (!isImg)    {        delete texture;        return ;    }    //这里建议使用成员变量来保存精灵，不然有可能导致显示白色块，出现异常！    sp =CCSprite::createWithTexture(texture);    CCSprite* sprite = CCSprite::createWithTexture(sp->getTexture());    sprite->setPosition(ccp(240,160));    this->addChild(sprite,10);    texture->release();    }

IOS运行截图：

Android 运行截图：

最后说明：

1.Android 运行前，记得在AndroidManifest.xml 开启网络，读取SD卡等权限，不然不会显示！

<!-- 访问internet权限 --><uses-permission android:name="android.permission.INTERNET"/><!-- 在SDCard中创建与删除文件权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- 往SDCard写入数据权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.REORDER_TASKS"/><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>  <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>

2.这里只是简单实现，并没有实现图片异步加载，后续逐渐完善！

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