开发游戏中用到从http 服务器下载文件的操作，所以要有个界面显示下载进度，同时联网采用curl库，因为下载是同步的操作，所以用了多线程
啥也不说，直接贴代码。我是采用ccbi做的页面，你也可以做一个标准的CCLayer，然后添加一个进度条的CCSprite。
////////////////////////////DownLoadScene.h/////////////////////////
#include "cocos2d.h"
#include "cocos-ext.h"
#include "jsoncpp.h"
#include "curl.h"
#include "pthread.h"
USING_NS_CC;
USING_NS_CC_EXT;
class DownLoadScene :publicCCLayer, publicCCBSelectorResolver, publicCCBMemberVariableAssigner,publicCCNodeLoaderListener
{
public:
CREATE_FUNC(DownLoadScene);
public:
virtual bool init();
virtual void onEnter();
virtual void onExit();
virtual ~DownLoadScene()
{
CC_SAFE_RELEASE_NULL(m_pSprite);
}
//CCBSelectorResolver
virtual SEL_MenuHandler onResolveCCBCCMenuItemSelector(CCObject * pTarget, const char* pSelectorName);
virtual SEL_CallFuncN onResolveCCBCCCallFuncSelector(CCObject * pTarget, const char* pSelectorName) { return NULL; };
virtual SEL_CCControlHandler onResolveCCBCCControlSelector(CCObject * pTarget, const char* pSelectorName);
//CCBMemberVariableAssigner
virtual bool onAssignCCBMemberVariable(CCObject* pTarget, const char* pMemberVariableName, CCNode* pNode);
virtual bool onAssignCCBCustomProperty(CCObject* pTarget, const char* pMemberVariableName, CCBValue* pCCBValue) { return false; };
void onNodeLoaded(cocos2d::CCNode *pNode, cocos2d::extension::CCNodeLoader *pNodeLoader);
void onHttpReqFinished(CCHttpClient* client, CCHttpResponse* response);
private:
CCSprite *m_pSprite;//进度条的CCSprite,注意锚点要设置为0,0.5，方便我们做进度显示
void onTimer(float t);//进度条刷新函数
pthread_t pid;//由于curl下载是同步操作，无法更新，所以要加一个线程来显示
static void* updateInfo(void *r);//线程函数
};
class DownLoadSceneLoader : public CCLayerLoader{
public:
CCB_STATIC_NEW_AUTORELEASE_OBJECT_METHOD( DownLoadSceneLoader, loader );
CCB_VIRTUAL_NEW_AUTORELEASE_CREATECCNODE_METHOD( DownLoadScene);
};
////////////////////////////DownLoadScene.cpp/////////////////////////
//
// DownLoadScene.cpp
//
// Created by Leo on 13-9-12.
//
//
#include "DownLoadScene.h"
FILE *s_pfileWrite;//下载时写文件的指针
CURL *s_pCurl;//curl库
int s_iFileSize;//总文件大小
int s_iCurrentFileSize;//当前下载大小
CCSprite *s_pSpriteLoading;//进度条的CCSprite的外部指针
int s_iSpriteWidth;//进度条的宽度保存
boolDownLoadScene::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
returnfalse;
}
returntrue;
}
voidDownLoadScene::onEnter()
{
CCLayer::onEnter();
}
voidDownLoadScene::onExit()
{
CCLayer::onExit();
}
SEL_MenuHandler DownLoadScene::onResolveCCBCCMenuItemSelector(CCObject * pTarget, const char* pSelectorName)
{
returnNULL;
}
SEL_CCControlHandler DownLoadScene::onResolveCCBCCControlSelector(CCObject * pTarget, const char* pSelectorName)
{
returnNULL;
}
bool DownLoadScene::onAssignCCBMemberVariable(CCObject* pTarget, const char* pMemberVariableName, CCNode* pNode)
{
//这里是CCB的处理，如果没有用cocosbuilder做的界面可以忽略
CCB_MEMBERVARIABLEASSIGNER_GLUE(this, "progress", CCSprite*, m_pSprite);
returnfalse;
}
//处理头信息，注意curl是一条一条的头信息发过来的，我们只关心里面的Content-Length获取总文件大小并保存到s_iFileSize中
size_t DownLoadHeadCallBack( char *ptr, size_t size,size_t nmemb, void *stream)
{
char buff[512] = {0};
string pketword = "Content-Length: ";
int i = 0;
if(NULL == ptr)
{
printf("packet read error! \r\n");
return size * nmemb;
}
while((ptr[i] == pketword[i])&&(ptr[i] != ' '))
{
i++;
}
if(ptr[i] == pketword[i])
{
//sscanf( (char*)ptr, "%*s%[^\r]", buff );//%s遇空格停止，加*则是忽略第一个读到的字符串
sscanf((char*)ptr, "%*[^ ] %[^\r\n]", buff);//第一段到空格结束前的内容都忽略掉，第二段从空格开始换行结束
CCLog("Size=%s\r\n",buff);
s_iFileSize = atoi(buff);
return size * nmemb;
}
else
{
return size * nmemb;
}
}
//写入文件操作，同时记录当前写的大小
size_t DownLoadWriteCallBack(void *ptr, size_t size, size_t nmemb, void *stream)
{
int written = fwrite(ptr, size, nmemb, (FILE *)s_pfileWrite);
CCLog("size download=%ld",size*nmemb);
s_iCurrentFileSize+=size*nmemb;
CCLog("test = %d %f",s_iSpriteWidth,(float)((float)s_iCurrentFileSize/(float)s_iFileSize));
s_pSpriteLoading->setTextureRect(CCRectMake(0, 0, s_iSpriteWidth*(float)((float)s_iCurrentFileSize/(float)s_iFileSize), s_pSpriteLoading->getContentSize().height));
return written;
}
//刷新进度条，这里用切割Texture的方式做的进度显示
void DownLoadScene::onTimer(float t)
{
CCLog("size download=%d",s_iCurrentFileSize);
CCLog("test = %d %f",s_iSpriteWidth,(float)((float)s_iCurrentFileSize/(float)s_iFileSize));
s_pSpriteLoading->setTextureRect(CCRectMake(0, 0, s_iSpriteWidth*(float)((float)s_iCurrentFileSize/(float)s_iFileSize), s_pSpriteLoading->getContentSize().height));
}
//线程函数，联网下载文件，用http的post方式请求
void* DownLoadScene::updateInfo(void* args){
s_pCurl = curl_easy_init();
if (!s_pCurl)
return NULL;
Json::Value root;
Json::FastWriter writer;
root["bv"]=true;
//设置文件下载路径
std::string pszPath = CCFileUtils::sharedFileUtils()->getWritablePath()+"data.zip";
if((s_pfileWrite=fopen(pszPath.c_str(),"w+"))==NULL)
{
curl_easy_cleanup(s_pCurl);
exit(1);
}
std::string rUrl = URL_PARSE;
rUrl+="/v/dup";//设置url
curl_easy_setopt(s_pCurl, CURLOPT_TIMEOUT, 10);//设置超时时间
curl_easy_setopt(s_pCurl, CURLOPT_POSTFIELDS, writer.write(root).c_str());//设置post数据
curl_easy_setopt(s_pCurl, CURLOPT_URL, rUrl.c_str());//设置URL
curl_easy_setopt(s_pCurl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);//设置URL的版本
curl_easy_setopt(s_pCurl, CURLOPT_WRITEDATA, &s_pfileWrite);//设置写数据的文件指针
curl_easy_setopt(s_pCurl, CURLOPT_WRITEHEADER,NULL);//设置写头文件的指针，这里要设置为NULL，否则有问题
curl_easy_setopt(s_pCurl, CURLOPT_WRITEFUNCTION, DownLoadWriteCallBack);//设置数据写回调
curl_easy_setopt(s_pCurl, CURLOPT_HEADERFUNCTION, DownLoadHeadCallBack);//设置头数据写回调
curl_easy_setopt(s_pCurl, CURLOPT_VERBOSE, true);//打开联网log，发布的时候可以关闭
curl_easy_perform(s_pCurl);//联网请求，会停留在这里直到完成
curl_easy_cleanup(s_pCurl);//关闭CURL
fclose(s_pfileWrite);//关闭文件句柄
curl_global_cleanup();//清除curl
returnNULL;
}
voidDownLoadScene::onNodeLoaded(cocos2d::CCNode *pNode, cocos2d::extension::CCNodeLoader *pNodeLoader)
{
s_iCurrentFileSize =0;
s_iFileSize=1;
s_pSpriteLoading = m_pSprite;
s_iSpriteWidth = s_pSpriteLoading->getContentSize().width;
schedule(schedule_selector(DownLoadScene::onTimer), 1);
m_pSprite->setTextureRect(CCRectMake(0, 0, m_pSprite->getContentSize().width*(s_iCurrentFileSize/s_iFileSize), m_pSprite->getContentSize().height));
pthread_create(&pid,NULL,updateInfo,NULL); //开启新线程
}