cocos2d-x CCHttpRequest获取网络图片并显示

//图片结构
class imgstruct : public CCObject
{
public:
imgstruct(const char* iName, const char* idStr, CCLayer* _layer, bool mask)
{
imageName = string(iName);
observerId = string(idStr);
layer = _layer;
useMask = mask;
}
~imgstruct()
{
}

string          imageName;
string          observerId;
CCLayer*        layer; //父layer
bool            useMask;
};

//图片监听，下载完成触发
class CCImageNotificationCenter : public CCNotificationCenter
{
public:
DECLARE_SINGLETON_CLASS(CCImageNotificationCenter);
CCImageNotificationCenter();
~CCImageNotificationCenter();

CCString addObserver(const char *imageName,CCLayer* layer,bool useMask);
void imageLoaded();
void removeObserver(const char *name);

void postNotification(const char *name, CCObject *object);

void imageLoaded(CCObject *obj);
static CCSprite* getSpriteFromWriteablePath(const char* name);

private:
CCNotificationCenter        m_notificationCenter;
int                         m_observerID;
};

CCString CCImageNotificationCenter::addObserver(const char *imageName, CCLayer* layer, bool useMask)
{
CCString* observerIDstr =  CCString::createWithFormat("%d",m_observerID);

m_notificationCenter.addObserver(this, callfuncO_selector(CCImageNotificationCenter::imageLoaded), observerIDstr->getCString(), new imgstruct(imageName, observerIDstr->getCString(), layer, useMask));

m_observerID++;
return observerIDstr->getCString();
}

void CCImageNotificationCenter::removeObserver(const char *name)
{
m_notificationCenter.removeObserver(this, name);
}

void CCImageNotificationCenter::postNotification(const char *name, CCObject *object)
{
m_notificationCenter.postNotification(name, object);
}

void CCImageNotificationCenter::imageLoaded(CCObject *obj)
{
imgstruct* img = (imgstruct*)obj;
CCLOG("imageLoaded success,imageName:%s",img->imageName.c_str());
CCSprite* sprite = CCImageNotificationCenter::getSpriteFromWriteablePath(img->imageName.c_str());
CCLOG("got sprite 0x%X", sprite);
if (img->useMask)
{
img->layer->addChild(CCImageNotificationCenter::createMaskedSprite(sprite,"mask.png"));
}
else
{
float scale_ = (float) img->layer->getContentSize().width  / (float)sprite->getContentSize().width;
sprite->setAnchorPoint(ccp(0,0));
sprite->setScale( scale_ );
img->layer->addChild(sprite);
}
this->removeObserver(img->observerId.c_str());
img->release();
}

CCSprite* CCImageNotificationCenter::getSpriteFromWriteablePath(const char* name)
{
std::string path = CCFileUtils::sharedFileUtils()->getWriteablePath();
path += name;
FILE* fp = fopen(path.c_str(),"rb");
if (!fp)
{
return NULL;
}
fseek(fp,0,SEEK_END);
int len = ftell(fp);
fseek(fp,0,SEEK_SET);
char* buf = (char*)malloc(len);
fread(buf,len,1,fp);
fclose(fp);
CCImage* img = new CCImage;
img->initWithImageData(buf,len);
free(buf);
cocos2d::CCTexture2D* texture = new cocos2d::CCTexture2D();
bool isImg = texture->initWithImage(img);
img->release();
if (!isImg)
{
delete texture;
return CCSprite::create("default.png");//加载资源并非图片时返回的默认图
}
CCSprite* sprite = CCSprite::createWithTexture(texture);
texture->release();
return sprite;
}

class ImageDownloader : public cocos2d::CCObject
{
DECLARE_SINGLETON_CLASS(ImageDownloader);
public:
ImageDownloader();
~ImageDownloader();

void CreateLuaFunc();

void SendHttpRequest(const char* url, CCLayer* layer, const char* filename);
void HttpRequestComplete(CCHttpClient *sender, CCHttpResponse *response);

CCString    observerID;
CCLayer*    container;
bool        useMask;
};

void ImageDownloader::SendHttpRequest(const char* url, CCLayer* layer, const char* filename)
{
CCHttpRequest* request = new CCHttpRequest();
this->container = layer;
if (this->container)
{
CCImageNotificationCenter::CreateInstance();
this->observerID = CCImageNotificationCenter::GetInstance()->addObserver(filename,container,useMask);
}
request->setUrl(url);
//    request->setUrl("http://neoimaging.beareyes.com.cn/png2/ni_png_2_1518.png");
request->setRequestType(CCHttpRequest::kHttpGet);
request->setResponseCallback(this, httpresponse_selector(ImageDownloader::HttpRequestComplete));
request->setTag("GET IMAGE");
CCHttpClient::getInstance()->send(request);
request->release();
}

void ImageDownloader::HttpRequestComplete(CCHttpClient *sender, CCHttpResponse *response)
{
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());
}

int statusCode = response->getResponseCode();
char statusString[64] = {};
sprintf(statusString, "HTTP Status Code: %d, tag = %s", statusCode, response->getHttpRequest()->getTag());
CCLog("response code: %d", statusCode);

if (!response->isSucceed())
{
CCLog("response failed");
CCLog("error buffer: %s", response->getErrorBuffer());
return;
}

// dump data
std::vector<char> *buffer = response->getResponseData();
std::string path = CCFileUtils::sharedFileUtils()->getWriteablePath();
std::string bufffff(buffer->begin(),buffer->end());

//保存到本地文件
path += "dl.png";
CCLOG("path: %s",path.c_str());
FILE *fp = fopen(path.c_str(), "wb+");
fwrite(bufffff.c_str(), 1,buffer->size(), fp);
fclose(fp);

//传入container的下载请求会添加侦听，待下载完毕自动添加到container上
if (this->container)
{
// container 是一个CCLayer ，用来显示动态加载的资源
CCImageNotificationCenter::GetInstance()->cocos2d::CCNotificationCenter::postNotification(this->observerID.getCString());
}
}