cocos2d-x中使用Http

一、如何使用

//发送接口
void CmdHelper::postRequest(const char* cmdTag, const char* url, const char* postData, size_t postDataLengt)
{
    CCHttpRequest* request = new CCHttpRequest();
    request->setTag(cmdTag);
    request->setUrl(url);
    request->setResponseCallback(this, httpresponse_selector(CmdHelper::onRequestRsp));

    //set request type:    get/post/put/delete
    request->setRequestType(CCHttpRequest::kHttpPost);

    //set header
    std::vector<std::string> headers;
    headers.push_back("Content-Type: application/json; charset=utf-8");
    request->setHeaders(headers);

    //set body data, POST only
    request->setRequestData(postData, postDataLengt);

    //set time out
    CCHttpClient::getInstance()->setTimeoutForConnect(TIMEOUT_CONNECT);
    CCHttpClient::getInstance()->setTimeoutForRead(TIMEOUT_READ);
    CCHttpClient::getInstance()->send(request);
    // don't forget to release it, pair to new
    request->release();
}

#define CMD_DOWNLOAD "CMD_DOWNLOAD"
#define URL_DOWNLOAD "http://192.168.2.122:9001/star/downsolution"
std::string data = "";
//发送post请求时，调用如下接口即可
postRequest(CMD_DOWNLOAD, URL_DOWNLOAD, data.c_str(), data.length());

//接收回调
void CmdHelper::onRequestRsp(CCHttpClient* client, CCHttpResponse* response)
{
    if (!response)
    {
        CCLOG("ERROR: %s ---> null response", __FUNCTION__);
        return;
    }

    std::string tag = response->getHttpRequest()->getTag();
    int statusCode = response->getResponseCode();
    CCLOG("%s ---> response code: %d, tag = %s", __FUNCTION__, statusCode, tag.c_str());

    std::string dataBody;
    if (!response->isSucceed())
    {
        CCLOG("response failed");
        CCLOG("error buffer: %s", response->getErrorBuffer());
        //this->setLastNetworkError(response->getErrorBuffer());
    }
    else
    {
        // dump data
        std::vector<char> *buffer = response->getResponseData();
        dataBody.assign(buffer->begin(), buffer->end());
        //CCLOG("%s", dataBody.c_str());
    }

    //dispatch
    if (CMD_DOWNLOAD == tag)
    {
        this->onDownloadTaskSolutionRsp(dataBody.c_str(), dataBody.size());
    }
    else
    {
        CCLOG("%s ---> error branch, cmd tag = %d", __FUNCTION__, tag.c_str());
    }
}

二、遇到的坑

1. 注意传输的编码格式
如上示例中，我们使用的utf-8编码，但是在http传输二进制数据的时候，服务器收到的数据变大了，所以要么改传输的编码格式，要么把本地要传输的二进制数据转码（比如我们用的base64）。