coco2d-x 下载网络图片

<img src="http://img.blog.csdn.net/20150130143712925?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvb3FxUXVaaTEyMzQ1Njc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

#include "HttpRequest.h"
#include "HttpClient.h"
USING_NS_CC;
USING_NS_CC_EXT;
using namespace std;

class StartScene : public cocos2d::CCLayer{
public:
    bool init();
    void onEnter();

    void onGetFinished(cocos2d::extension::CCHttpClient *target,CCObject *obj);
    void menuCloseCallback(CCObject* pSender);
    cocos2d::CCSprite *sp;
    
private:

};

void StartScene::onEnter(){
    CCLayer::onEnter();    
    
    
    //    这是个静态方法 得到一个httpClient实例
    CCHttpClient *httpClient = CCHttpClient::getInstance();
    //    创建一个httpRequest对象
    CCHttpRequest *httprequest = new  CCHttpRequest();
    //    设置请求类型
    httprequest->setRequestType(CCHttpRequest::kHttpGet);
    //    设置请求URL
    httprequest->setUrl("http://113.106.90.141:2020/Upload/2015/1/28/464d4345-7675-4d49-9c5c-ee16483eae46_640_300.png");
    //    设置回调
    httprequest->setResponseCallback(this, httpresponse_selector(StartScene::onGetFinished));
    // 设置标签
    httprequest->setTag("get image");
    //    设置连接超时时间
    httpClient->setTimeoutForConnect(30);
    //    发送请求
    httpClient->send(httprequest);
    //    释放httprequest
    httprequest->release();
    httprequest=NULL;

}

void StartScene::onGetFinished(CCHttpClient *target,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;
    }
    
    //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);
   // vector<char> 转 string
    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);
}

void StartScene::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();
    
    return;
}