cocos2dx Http网络编程

转自：http://blog.csdn.net/wangbin_jxust/article/details/9632771，http://blog.csdn.net/wangbin_jxust/article/details/9707873

联网游戏开发中，经常遇到http编程，接下来就分三次对cocos2dx的网络编程进阶。

本博文中先介绍建立基本的http通信并得到返回信息。

1.创建cocos2dx工程。

2.项目引用外部库。

如果要使用cocos2dx的CCHttpClient来进行网络访问，则需要引入cocos2dx的相关库，详细步骤如下:

右键单击项目->属性->c/c++->常规，在右边的附件包含目录中添加cocos2dx的extensions目录对应的路径。

然后,右键单击项目->属性->链接器->输入，在右边的附件依赖项中添加libcurl_imp.lib和libExtensions.lib两个库，用分号隔开。

如果不引入extensions文件夹，会出现找不到CCHttpClient的错误；

如果不引入libcurl_imp.lib和libExtensions.lib两个库，编译项目时也会出现报错。

另外注意引入头文件:

#include "cocos-ext.h"  

3.添加下载按钮和回调函数。

添加下载按钮:

CCMenuItemImage *pDownloadItem = CCMenuItemImage::create(
            "bt_blue_light.png",
            "bt_blue_light.png",
            this,
            menu_selector(HelloWorld::menuDownloadCallback)
        );
        CC_BREAK_IF(!pDownloadItem);
        CCSize pWinSize = CCDirector::sharedDirector()->getWinSize();
    
        CCMenu* pDownloadMenu = CCMenu::create(pDownloadItem, NULL);
        pDownloadMenu->setPosition(ccp(50  ,50));
        CC_BREAK_IF(! pDownloadMenu);
        this->addChild(pDownloadMenu, 1);

添加按钮的回调函数:

void HelloWorld::menuDownloadCallback(CCObject* pSender)
{
    cocos2d::extension::CCHttpRequest* request = new cocos2d::extension::CCHttpRequest();
    request->setUrl("http://www.oschina.net/action/api/news_list");
    request->setRequestType(cocos2d::extension::CCHttpRequest::kHttpPost);
    std::vector<std::string> headers;
    headers.push_back("Content-Type: application/json; charset=utf-8");
    request->setHeaders(headers);
    const char* postData = "catalog=2&pageIndex=1&pageSize=5";
    request->setRequestData(postData ,strlen(postData));
    request->setResponseCallback(this, callfuncND_selector(HelloWorld::onHttpRequestCompleted));
    request->setTag("Post_My_Data");
    cocos2d::extension::CCHttpClient::getInstance()->send(request);
    request->release();
}

按钮的回调函数里向服务器发起http请求了，request->setResponseCallback(this, callfuncND_selector(HelloWorld::onHttpRequestCompleted))一行代码，向请求结束时添加了onHttpRequestCompleted回调函数

4.为http request 结束增加回调函数并读取网络数据

void HelloWorld::onHttpRequestCompleted(cocos2d::CCNode *sender ,void *data)
{
    AllocConsole();
    freopen("CONIN$", "r", stdin);
    freopen("CONOUT$", "w", stdout);
    freopen("CONOUT$", "w", stderr);
    cocos2d::extension::CCHttpResponse *response = (cocos2d::extension::CCHttpResponse*)data;  
     if (!response)  
    {
        return;  
    } 
     if (0 != strlen(response->getHttpRequest()->getTag())) 
    {
        CCLog("%s completed", response->getHttpRequest()->getTag());
    }
     int statusCode = response->getResponseCode();
     char statusString[64] = {};
     sprintf(statusString ,"Http status code:%d ,tag = %s" ,statusCode ,response->getHttpRequest()->getTag());
     CCLog("response code:%d" ,statusCode);
     if (!response->isSucceed())
     {
         CCLog("response failed");
         CCLog("error buffer:%s" ,response->getErrorBuffer());
     }
     std::vector<char> *buffer = response->getResponseData();
     printf("Http response,dump data:");
     std::string result = "";
     for (unsigned int i = 0; i < buffer->size(); i ++)
     {
        printf("%c" ,(*buffer)[i]);
     }
}

 debug时就能看到reponse中服务器返回的数据了。

打印到窗体中:

转自：http://blog.csdn.net/sakana87320/article/details/8595242

概述

使用CCHttpClient一般有6步：

1. 创建CCHttpRequest实例。
2. 设置Url和请求类型。
3. 使用CCHttpClient向Url发出请求(连接Url)。
4. 读取响应。
5. 释放连接。
6. 响应处理。

如何使用

获取CCHttpRequest实例

使用一个无参构造方法创建一个CCHttpRequest的实例。CCHttpRequest无参构造方法可以获取一个默认设置的CCHttpRequest实例，该实例可以满足大多数需求。

cocos2d::extension::CCHttpRequest* request = new cocos2d::extension::CCHttpRequest();

设置Url

request->setUrl("blog.csdn.net/sakana87320/article/details/8595242");

设置GET请求

//设置为GET请求：kHttpGet
request->setRequestType(cocos2d::extension::CCHttpRequest::kHttpGet);
//设置处理响应回调函数
request->setResponseCallback(this, callfuncND_selector(HttpClientTest::onHttpRequestCompleted));
request->setTag("GET test");

设置POST请求

//设置为POST请求：kHttpPost
request->setRequestType(cocos2d::extension::CCHttpRequest::kHttpPost);
//设置处理响应回调函数
request->setResponseCallback(this, callfuncND_selector(HttpClientTest::onHttpRequestCompleted));
request->setTag("POST test");

发送请求

cocos2d::extension::CCHttpClient::getInstance()->send(request);

处理返回数据(响应回调函数）

void HttpClientTest::onHttpRequestCompleted(cocos2d::CCNode *sender, void *data)
{
    CCHttpResponse *response = (CCHttpResponse*)data;
    if (!response)
    {
        return;
    }
    // 你可以使用: response->request->reqType获取请求类型
    if (0 != strlen(response->getHttpRequest()->getTag()))
    {
        CCLog("%s completed", response->getHttpRequest()->getTag());
    }
    //获取状态码
    int statusCode = response->getResponseCode();
    char statusString[64] = {};
    sprintf(statusString, "HTTP Status Code: %d, tag = %s", statusCode, response->getHttpRequest()->getTag());
    m_labelStatusCode->setString(statusString);
    CCLog("response code: %d", statusCode);
    if (!response->isSucceed())
    {
    //访问失败获取错误信息
        CCLog("response failed");
        CCLog("error buffer: %s", response->getErrorBuffer());
        return;
    }
    // 获取返回数据。
    std::vector<char> *buffer = response->getResponseData();
    printf("Http Test, dump data: ");
    for (unsigned int i = 0; i < buffer->size(); i++)
    {
        printf("%c", (*buffer)[i]);
    }
    printf("
");
}

释放连接

request->release();

注意

Android平台下不要忘了添加访问网络的权限。