【Cocos2d-x】可以显示在线图片的CCSprite，cocos2d-xccsprite
可以显示在线图片的CCSprite，使用HttpClient异步请求图片数据，当请求成功时，保存图片数据到本地，然后更新CCSprite的纹理，下载中时显示默认图片（可以设置默认图片）。
OnlineImageSprite.h
#ifndef __ONLINEIMAGESPRITE_H__
#define __ONLINEIMAGESPRITE_H__
#include "cocos2d.h"
USING_NS_CC;
#include "cocos-ext.h"
USING_NS_CC_EXT;
// 可以显示在线图片的CCSprite
class OnlineImageSprite:public CCSprite{
public:
/*
创建一个显示在线图片的Sprite
* defaultImagePath默认图片路径（当图片加载中时显示）
* url图片url
*/
static OnlineImageSprite* create(const char* defaultImagePath, const char* url);
bool init(const char* defaultImagePath, const char* url);
void onDownloadCompleted(CCHttpClient *sender, CCHttpResponse *response);
protected:
// 下载图片
void downloadImage(const char* url);
// 获取图片路径
std::string getImagePath(const char* url);
// 图片是否存在
bool isExist(const char* url);
// 保存图片
std::string saveImage(const std::string& data);
private:
const char* m_url;
};
#endif
OnlineImageSprite.cpp
#include "OnlineImageSprite.h"
#include <string>
using namespace std;
string&replace_all(string&str,conststring&old_value,conststring&new_value)
{
while(true){
string::size_typepos(0);
if((pos=str.find(old_value))!=string::npos)
str.replace(pos,old_value.length(),new_value);
elsebreak;
}
returnstr;
}
string&replace_all_distinct(string&str,conststring&old_value,conststring&new_value)
{
for(string::size_typepos(0);pos!=string::npos;pos+=new_value.length()){
if((pos=str.find(old_value,pos))!=string::npos)
str.replace(pos,old_value.length(),new_value);
elsebreak;
}
returnstr;
}
OnlineImageSprite* OnlineImageSprite::create(const char* defaultImagePath, const char* url){
OnlineImageSprite* pSprite = new OnlineImageSprite();
if (pSprite && pSprite->init(defaultImagePath,url))
{
pSprite->autorelease();
return pSprite;
}
CC_SAFE_DELETE(pSprite);
return NULL;
}
bool OnlineImageSprite::init(const char* defaultImagePath, const char* url){
m_url = url;
CCTexture2D* pTexture = NULL;
// 图片是否存在，如果不存在使用默认纹理并下载图片
if (isExist(url))
{
const char* path = getImagePath(url).c_str();
pTexture = CCTextureCache::sharedTextureCache()->addImage(path);
}else{
pTexture = CCTextureCache::sharedTextureCache()->addImage(defaultImagePath);
// 下载图片
downloadImage(url);
}
// 初始化
if (CCSprite::initWithTexture(pTexture))
{
return true;
}
return false;
}
//判断图片是否已经存在
bool OnlineImageSprite::isExist(const char* url){
std::string path = getImagePath(url);
return CCFileUtils::sharedFileUtils()->isFileExist(path);
}
//获取图片全路径
std::string OnlineImageSprite::getImagePath(const char* url){
std::string urlStr = url;
replace_all(urlStr,"/","");
replace_all(urlStr,"\\","");
replace_all(urlStr,":","");
replace_all(urlStr,".","");
return CCFileUtils::sharedFileUtils()->getWritablePath().append("/").append(urlStr);
}
// 下载图片
void OnlineImageSprite::downloadImage(const char* url){
// 发起http请求，下载图片
CCHttpRequest* request = new CCHttpRequest();
request->setUrl(url);
request->setRequestType(CCHttpRequest::kHttpGet);
request->setResponseCallback(this, httpresponse_selector(OnlineImageSprite::onDownloadCompleted));
CCHttpClient::getInstance()->send(request);
request->release();
}
// 请求回调
void OnlineImageSprite::onDownloadCompleted(CCHttpClient *sender, CCHttpResponse *response){
if (!response)
{
return;
}
// 返回码
int statusCode = response->getResponseCode();
char statusString[64] = {};
sprintf(statusString, "HTTP Status Code: %d", statusCode);
CCLog("response code: %d", statusCode);
// 请求失败
if (!response->isSucceed())
{
CCLog("response failed");
CCLog("error buffer: %s", response->getErrorBuffer());
return;
}
// dump data
std::vector<char> *buffer = response->getResponseData();
std::string data (buffer->begin(),buffer->end());
std::string path =saveImage(data);
//如果保存图片成功，更新纹理
if (path != "")
{
CCTexture2D* pTexture = CCTextureCache::sharedTextureCache()->addImage(path.c_str());
if (pTexture)
{
setTexture(pTexture);
}
}
}
// 保存图片
std::string OnlineImageSprite::saveImage(const std::string& data){
std::string path = this->getImagePath(m_url);
FILE* file = fopen(path.c_str(), "wb");
if (file)
{
// 1.buff
// 2.每次写的字节数
// 3.写多少次结束
// 4.文件句柄
fwrite(data.c_str(), 1,data.length(), file);
fclose(file);
return path;
}
return "";
}
使用示例：//创建OnlineImageSpirte，参数：1.默认图片路径 2.在线图片的url
CCSprite* pSprite = OnlineImageSprite::create("HelloWorld.png","http://cc.cocimg.com/cocos2dx/image/logo.png");
//设置位置
pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
//添加到Layer
this->addChild(pSprite, 0);
项目地址：https://coding.net/u/linchaolong/p/OnlineImageSprite/git
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