coco2dx c++ HTTP实现

coco2dx c++ HTTP实现 

达到的结果如下面的

iPhone截图

android 日志截图

流程图例如以下

功能主要通过CURL c pthread 实现 我实现的不是多线程断点(假设要实现能够依据我这个进行加入任务序列,可參考 cocos2d-x 中AssetsManager的实现,事实上我的部分也是參考这个写的 为什么写这个呢 原因就是 AssetsManager是不支持断点续传的)

博客地址:http://blog.csdn.net/vpingchangxin/article/details/22309067

详细能够去CURL官网或者找资料科普一下

PS:假设是版本号公布最后设置超时时间20秒左右否则下载会占用很多其它下载实现效率等问题 我是为了測试 设置超时时间为2秒

1.先创建一个界面进行控制进行下载、停止、删除、进度 并绑定事件

2.在进行下载中开一个线程进行下载 (由于牵涉到UI,不开线程UI会卡着阻塞UI线程直到下载完毕)以下是事件中的控制 HelloWorldSecene.cpp中的实现

void HelloWorld::menuCallback(CCObject* pSender) {
    CCMenuItem *item = (CCMenuItem *)pSender;
    switch (item->getTag()) {
        case 1: // down start
            CCDirector::sharedDirector()->getScheduler()->scheduleSelector(schedule_selector(HelloWorld::updateUI), this, 0, false); // HttpClient中參考
            isStop = false;
            this->threadStart();
            break;
        case 2: // down stop
            isStop = true;
            break;
        case 3:
            if (isStop) {
                CCLog("downFilePath:%s",downFilePath.c_str());
                if (access(downFilePath.c_str(), 0) == 0) {
                    remove(downFilePath.c_str());
                    CCMessageBox("删除成功", "温馨提示");
                }else{
                    CCMessageBox("没有找到文件文件夹", "温馨提示");
                }
            }else{
                CCMessageBox("下载中或没有文件下载", "温馨提示");
            }
            
            break;
        default:
            break;
    }
}

3。实现线程类并回调设置

// 启动线程的方法
int HelloWorld::threadStart() {
    pthread_mutex_init(&g_downloadMutex, NULL);
    int errCode=0;
    pthread_t th_curlDown; // 线程初始化
    do {
        pthread_attr_t tAttr;
        errCode=pthread_attr_init(&tAttr);
        CC_BREAK_IF(errCode!=0);
        errCode=pthread_attr_setdetachstate(&tAttr, PTHREAD_CREATE_DETACHED);
        if(errCode!=0) {
            pthread_attr_destroy(&tAttr);
            break;
        }
        errCode=pthread_create(&th_curlDown, &tAttr, thread_funcation, this);
    } while (0);
    return errCode;
}

// 须要线程来完毕的功能都写在这个函数里
void* HelloWorld::thread_funcation(void *arg) {
    CCLOG("thread started...");
    HelloWorld *hw = (HelloWorld*)arg;
    hw->ccc = new CurlDown("http://developer.baidu.com/map/static/doc/output/BaiduMap_AndroidSDK_v2.4.0_All.zip",hw->downFilePath);
    //    ccc->mDownloadUrl = "http://developer.baidu.com/map/static/doc/output/BaiduMap_AndroidSDK_v2.4.0_All.zip";
    //    int leng = ccc->getDownloadFileLenth();
    hw->ccc->setDelegate(hw);
    hw->ccc->downloadControler();
    
    return NULL;
}

4.实现回调进度、成功、错误(里面用到线程锁对数据进度更新UI。本来对线程就不熟悉,问了群里面的大牛,看了不少资料)

void HelloWorld::onError(CurlDown::ErrorCode errorCode){
    CCLog("error");
    
    pthread_mutex_lock(&g_downloadMutex);
    updateStr = "error";
    pthread_mutex_unlock(&g_downloadMutex);
    
    CCDirector::sharedDirector()->getScheduler()->unscheduleSelector(schedule_selector(HelloWorld::updateUI), this);
}
void HelloWorld::onProgress(double percent, void *delegate, string filefullPath){ // 下载进度
    CCLog("donw progress:%.2f%%",percent);
    
    if (isStop) {
        CurlDown * cd = (CurlDown *)delegate;
        //        pthread_mutex_lock(&g_downloadMutex);
        cd->setStopDown();
        //        pthread_mutex_unlock(&g_downloadMutex);
    }
    
    pthread_mutex_lock(&g_downloadMutex);
    const char * per =CCString::createWithFormat("donw progress:%.2f%%",percent)->getCString();
    updateStr = per;
    downFilePath = filefullPath;
    pthread_mutex_unlock(&g_downloadMutex);
}
void HelloWorld::onSuccess(string filefullPath){
    CCLog("success");
    
    pthread_mutex_lock(&g_downloadMutex);
    updateStr = "success";
    downFilePath = filefullPath;
    pthread_mutex_unlock(&g_downloadMutex);
}

5.CurlDown.h CurlDown.cpp类实现 (能够直接抽取出来用于不论什么地方,没有牵涉到cocos2d-x部分。cocos2d-x 部分能够删除没关系)

1)对类初始化

static pthread_mutex_t g_downloadMutex_1;

CurlDown::~CurlDown(){
    mFileLenth = 0;
}
CurlDown::CurlDown():isStop(false),mDownloadUrl(""),timeout(2){ // test timeout 2 seconds. if release timeout 20 seconds
    mFileLenth = 0;
    mFilePath = "";
    pthread_mutex_init(&g_downloadMutex_1, NULL);
}
CurlDown::CurlDown(string downUrl,string filePath):mFileLenth(0),isStop(false),mDownloadUrl(downUrl),timeout(2),mFilePath(filePath){  // test timeout 2 seconds. if release timeout 20 seconds
    mDownloadUrl = downUrl;
    pthread_mutex_init(&g_downloadMutex_1, NULL);
}

void CurlDown::setDelegate(CurlDownDelegate * delegate) {
    mDelegate = delegate;
}

2)控制下载方法

void CurlDown::downloadControler() {
    CCLog("--1-");
    mFileLenth = getDownloadFileLenth(); // 获取远程文件大小
    if (mFileLenth <= 0) {
        cout << "download file fail..." << endl;
        mDelegate->onError(kNetwork);
        return;
    }
    vector<string> searchPaths = CCFileUtils::sharedFileUtils()->getSearchPaths();
    vector<string>::iterator iter = searchPaths.begin();
    searchPaths.insert(iter, mFilePath);
    CCFileUtils::sharedFileUtils()->setSearchPaths(searchPaths);
    
    CCLog("--2-mFileLenth:%f",mFileLenth);
	mFileName = mDownloadUrl.substr(mDownloadUrl.rfind('/') + 1);
    CCLog("--3-");
    CCLog("mFileName:%s;",mFileName.c_str());
//    mFilePath = CCFileUtils::sharedFileUtils()->getWritablePath();
//    CCLog("--5-");
    mFilePath = mFilePath + mFileName;
    CCLog("mFilePath:%s",mFilePath.c_str());
    CCLog("--6-");
    bool ret = false;
    while (true){ // 循环下载 每30秒进行下载 避免断网情况
        ret = download(); //直接下载 进行阻塞线程
        CCLog("----stop---%s------",isStop?

"true":"false"); if (isStop) { // 假设进行停止 break CCLog("----stop---------"); break; } if (ret ){ //下载完毕 break; } sleep(0.5); //每次下载中间间隔0.5秒 } if (ret) { CCLog("download ok"); mDelegate->onSuccess(mFilePath); } else { CCLog("download fail"); mDelegate->onError(kUncompress); } }


3)核心下载

#pragma mark 进行下载
bool CurlDown::download() {
    FILE *fp = NULL;
    if(access(mFilePath.c_str(), 0)==0) { // 以二进制形式追加
        fp = fopen(mFilePath.c_str(), "ab+");
    } else { // 二进制写
        fp = fopen(mFilePath.c_str(), "wb");
    }
    
    if (fp == NULL) {// 假设文件初始化失败进行返回
        return false;
    }
    
    // 读取本地文件下载大小
    long localFileLenth = getLocalFileLength(); //已经下载的大小
    CCLog("filePath:%s。leng:%ld",mFilePath.c_str() , localFileLenth ); //4397779 //3377875
    
    CURL *handle = curl_easy_init();
    std::string packageUrl = mDownloadUrl; //下载地址+下载文件名称
    curl_easy_setopt(handle, CURLOPT_URL, packageUrl.c_str()); // http://curl.haxx.se/libcurl/c/fopen.html
    curl_easy_setopt(handle, CURLOPT_TIMEOUT, timeout);
    curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, my_write_func);   //写文件回调方法
    curl_easy_setopt(handle, CURLOPT_WRITEDATA, fp); // 写入文件对象
    curl_easy_setopt(handle, CURLOPT_RESUME_FROM, localFileLenth);  // 从本地大小位置进行请求数据
    //    curl_easy_setopt(handle, CURLOPT_RESUME_FROM_LARGE, localFileLenth); // 坑
    curl_easy_setopt(handle, CURLOPT_NOPROGRESS, 0L);
    curl_easy_setopt(handle, CURLOPT_PROGRESSFUNCTION, my_progress_func ); //下载进度回调方法
    curl_easy_setopt(handle, CURLOPT_PROGRESSDATA, this); // 传入本类对象
    
    CURLcode res = curl_easy_perform(handle);
    fclose(fp);
    return res == CURLE_OK;
}

以下大家要问道的就是求源代码(^..^)源代码已经上传github https://github.com/pingchangxin/BPDownload cesd 下载位置:http://download.csdn.net/detail/vpingchangxin/7108649

我就不再这里mac她跑到隔壁 windows在没有运行(至win繁琐的头痛的结构)

原文地址:https://www.cnblogs.com/yxwkf/p/4568154.html