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本文转载于：http://www.cnblogs.com/zisou/p/cocos2dxWLTP.html
经过自己简单封装了一下，实现了获取网络图片，按照比例展示出来，实现方法是cocos2dx - http的异步方法，相信有很多地方都会使用
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；
效果图：
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原文地址：http://www.cnblogs.com/guangyun/p/4670178.html
