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 *** 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+='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!'; 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(),&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:
<!-- 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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