cocos2d-x 制作资源下载页面

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

}

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