Cocos2d-x 读取网络图片创建精灵

Cocos2d-x 2.1.4 里面已经为我们提供了HttpRequest ，HttpClient，CCHttpResponse用于处理网络相关操作

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 instance
bool 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+='\0';
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(), "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();

}

IOS运行截图：



Android 运行截图：



最后说明：
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！

<!-- 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！