cocos2dx 获取网络图片并创建精灵显示到界面上

参考文章:http://blog.csdn.net/candyforever/article/details/10185855

TestGetPicFromHttp.h

#ifndef __TESTGETPICFROMHTTP_H__
#define __TESTGETPICFROMHTTP_H__

#include "cocos2d.h"
#include "cocos-ext.h"

USING_NS_CC;
USING_NS_CC_EXT;

class TestGetPicFromHttp : public cocos2d::CCLayer
{
private:
TestGetPicFromHttp();
~TestGetPicFromHttp();

public:
virtual bool init();
CREATE_FUNC(TestGetPicFromHttp);

void initHttpInfo(void);
void onGetFinished(CCHttpClient *client, CCHttpResponse *response);
void setGetTextureVisible(void);

static TestGetPicFromHttp* get_instance(void);

private:
static TestGetPicFromHttp* m_instance;
};

#endif // __TESTGETPICFROMHTTP_H__

TestGetPicFromHttp.cpp

#include "TestGetPicFromHttp.h"

#include <vector>
#include <string>
using namespace std;

TestGetPicFromHttp* TestGetPicFromHttp::m_instance = 0;
TestGetPicFromHttp::TestGetPicFromHttp()
{

}

TestGetPicFromHttp::~TestGetPicFromHttp()
{

}

// on "init" you need to initialize your instance
bool TestGetPicFromHttp::init()
{
if ( !CCLayer::init() )
{
return false;
}

initHttpInfo();

return true;
}

void TestGetPicFromHttp::initHttpInfo(void)
{
CCHttpClient* httpClient = CCHttpClient::getInstance();
CCHttpRequest* httpRequest = new CCHttpRequest();
httpRequest->setRequestType(CCHttpRequest::kHttpGet);
httpRequest->setUrl("http://img.my.csdn.net/uploads/201405/12/1399882123_6429.jpg");
httpRequest->setResponseCallback(this, httpresponse_selector(TestGetPicFromHttp::onGetFinished));
httpRequest->setTag("PicGet");
httpClient->setTimeoutForConnect(30); //设置链接超时时间
httpClient->send(httpRequest);
httpRequest->release();
httpRequest = NULL;
}

void TestGetPicFromHttp::onGetFinished(CCHttpClient *client, CCHttpResponse *response)
{
// 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()+"head2.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);

setGetTextureVisible();//保存完毕后 在调用显示贴图函数
}
void TestGetPicFromHttp::setGetTextureVisible(void)
{
unsigned char* pBuffer = NULL;
unsigned long bufferSize = 0;
string path = CCFileUtils::sharedFileUtils()->getWritablePath()+"head2.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！
CCSprite* m_get_sprite = CCSprite::createWithTexture(texture);
CCSprite* sprite = CCSprite::createWithTexture(m_get_sprite->getTexture());
if (sprite)
{
this->addChild(sprite);
CCSize winSize = CCDirector::sharedDirector()->getWinSize();
this->setPosition(ccp(winSize.width/2, winSize.height/2));
}
texture->release();
}

TestGetPicFromHttp* TestGetPicFromHttp::get_instance(void)
{
if (m_instance == NULL) {
m_instance = TestGetPicFromHttp::create();
}
return m_instance;
}

使用方式：在HelloWorldScene.cpp 中调用

TestGetPicFromHttp* httpLayer = TestGetPicFromHttp::get_instance();
this->addChild(httpLayer);
httpLayer->init();

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>