获取网络图片缓存并展示

到着这个需求；比如获取玩家的头像。

我就直接贴代码了，只需一个类就可以搞定；

HttpGetImg.h

#ifndef __HttpGetImg__#define __HttpGetImg__#include "cocos2d.h"#include "HttpRequest.h"#include "HttpClient.h"USING_NS_CC_EXT;using namespace std;USING_NS_CC;class HttpGetImg : public cocos2d::CCLayer{public:        HttpGetImg();    ~HttpGetImg();    //获取网络图片，需要地址    static void GetHttpImg(CCObject* obj, string imgurl,int number);        void onHttpRequestRptImg(cocos2d::extension::CCHttpClient *sender, cocos2d::extension::CCHttpResponse *response);    //按原来默认头像比例设置新图片大小    static void setImgSize(int oldhead_w,int oldhead_h,CCSprite* sprite);        //创建图片覆盖原有图片    static void CreateImg(CCSprite* tagSprite,CCSprite* oldSprite,CCTexture2D* texture,int newTag);private:    };#endif /* HttpGetImg */

HttpGetImg.cpp

#include "HttpGetImg.h"#include "../DataModel/GlobalInfo.h"#include "../GameConfig.h"#include "../Commen/PublicDoFunc.h"HttpGetImg::HttpGetImg(void){    }void HttpGetImg::GetHttpImg(CCObject* obj, string imgurl,int number){    CCHttpRequest* request = new CCHttpRequest();    // required fields    request->setUrl(imgurl.c_str());    request->setRequestType(CCHttpRequest::kHttpGet);    request->setResponseCallback(obj, httpresponse_selector(HttpGetImg::onHttpRequestRptImg));    // optional fields    char thisnumber[10] = "";    sprintf(thisnumber, "%d",number);    request->setTag(thisnumber);    CCHttpClient::getInstance()->send(request);    request->release();}void HttpGetImg::onHttpRequestRptImg(CCHttpClient *sender, CCHttpResponse *response){        char c_tag[20]= "";    sprintf(c_tag, "%s",response->getHttpRequest()->getTag());    //    CCLog("%s completed", response->getHttpRequest()->getTag());    string str_tag = c_tag;    if (!response)    {        return;    }    // You can get original request type from: response->request->reqType    if (0 != strlen(response->getHttpRequest()->getTag()))    {        //        CCLog("%s completed", response->getHttpRequest()->getTag());    }        if (!response->isSucceed())    {        CCLog("response failed");        CCLog("error buffer: %s", response->getErrorBuffer());        return;    }        vector<char> *buffer = response->getResponseData();        //create image    CCImage* img = new CCImage;    img->initWithImageData((unsigned char*)buffer->data(),buffer->size());        //create texture    CCTexture2D* texture = new CCTexture2D();    bool isImg = texture->initWithImage(img);    img->release();    　　 //将texture存下来    texture    //已下是自己封装的PublicDoFunc异步调用主线程执行换图操作的部分，可以自己去封装    //SEL_CallFuncN pfnCallback =callfuncN_selector(View_Room::upPlayerHead);    //CCNode* nd = CCNode::create();    //buffer->clear();    //nd->setTag(CCString::create(str_tag)->intValue());    //PublicDoFunc::toDoFuncN(LAYER_ROOM, pfnCallback,nd);}void HttpGetImg::setImgSize(int oldhead_w,int oldhead_h,CCSprite* sprite){    float s_X=oldhead_w/sprite->getContentSize().width;    float s_Y=oldhead_h/sprite->getContentSize().height;    sprite->setScaleX(s_X);    sprite->setScaleY(s_Y);}void HttpGetImg::CreateImg(CCSprite* tagSprite,CCSprite* oldSprite,CCTexture2D* texture,int newTag){    int oldw =oldSprite->getContentSize().width;    int oldh =oldSprite->getContentSize().height;    if(texture!=NULL)    {        CCSprite* sprite = CCSprite::createWithTexture(texture);        //按原比例设置        setImgSize(oldw,oldh,sprite);        sprite->setPosition(oldSprite->getPosition());        tagSprite->addChild(sprite,1,newTag);        texture->release();    }}HttpGetImg::~HttpGetImg(void){    }

 

代码非常简洁简单，先通过：

GetHttpImg(CCObject* obj, string imgurl,int number);

获取到texture，然后把texture存起来，在自己要展示的页面去调用：

CreateImg(CCSprite* tagSprite,CCSprite* oldSprite,CCTexture2D* texture,int newTag)

第一个参数是要展示的父级sprite,第二个是默认头像图片（如果没有下载成功网络图片，显示替代图片）,第三个是缓存的texture；