c++使用http协议上传文件到七牛云服务器

使用c++ http协议上传文件到七牛服务器时，比较搞的一点就是header的设置：

"Content-Type:multipart/form-data;boundary=xxx"

////////////// HttpUpload.h ////////////
#include "cocos2d.h"

#include "network/HttpClient.h"
using namespace cocos2d;
using namespace std;

class uploadFile
{
public:
	static uploadFile *m_inst;
	static uploadFile *GetInst();

	void UpLoadFile(string photoPath,string key,string token);

	void onHttpRequestCompleted(network::HttpClient* client, network::HttpResponse* response);

//	static size_t write_data(uint8_t *dataBack, size_t size, size_t nmemb, void *userp);
};

/////////////////////////  HttpUpload.cpp   ////////////////////
#include "HttpUpload.h"    

uploadFile* uploadFile::m_inst = NULL;

uploadFile* uploadFile::GetInst()
{
	if (!m_inst)
	{
		m_inst = new uploadFile();
		return m_inst;
	}
	return NULL;
}

void uploadFile::onHttpRequestCompleted(network::HttpClient* client, network::HttpResponse* response)
{
    int result = 0;
	if (!response->isSucceed())
	{

		CCLOG("error");
		CCLOG("error buffer: %s", response->getErrorBuffer());
		CCLOG("error code: %d", (int)response->getResponseCode());

		//CCLOG("resp: %s", response->getResponseData());

		std::vector<char> *buffer = response->getResponseData();
		std::string errMsg = "";
		for (vector<char>::iterator iter = buffer->begin(); iter != buffer->end(); ++iter)
		{
			errMsg += *iter;
		}
		CCLOG("errMsg: %s",errMsg.c_str());
	}
    else
    {
        result = 1;
        CCLOG("upload success");
//        std::vector<char>* buffer = response->getResponseData();
//        std::vector<char>* header = response->getResponseHeader();
//        auto data = std::string(buffer->begin(), buffer->end());
//        auto headerData = std::string(header->begin(), header->end());
//        CCLOG("responseData %s", data.c_str());
//        CCLOG("responseHeader %s", headerData.c_str());
    }
    EventCustom event("upload_result");
    event.setUserData(&result);
    Director::getInstance()->getEventDispatcher()->dispatchEvent(&event);

};

void uploadFile::UpLoadFile(string photoPath,string key,string token)
{
	network::HttpClient* http = network::HttpClient::getInstance();
	network::HttpRequest* req = new network::HttpRequest;
	req->setRequestType(network::HttpRequest::Type::POST);
	req->setUrl("http://up.qiniu.com");
	req->setResponseCallback(CC_CALLBACK_2(uploadFile::onHttpRequestCompleted, this));
    std::string pathKey = photoPath;

	Data imgdata = FileUtils::getInstance()->getDataFromFile(pathKey);
//	long buff = 0;
//	unsigned char * pBuffer = FileUtils::sharedFileUtils()->getFileData(pathKey.c_str(), "rb", &buff);
//	const char* fileBinary = (const char*)pBuffer;
//	std::string strBin = std::string(fileBinary, buff);

    cocos2d:Data fileData = FileUtils::getInstance()->getDataFromFile(pathKey);
    std::string strBin = std::string((const char*)fileData.getBytes(), fileData.getSize());

	std::string boundary = "----------------WebKitFormBou3123ndaryEm5WNw6hGiQUBpng";
	std::vector<std::string> headers;
	headers.push_back("Content-Type:multipart/form-data;boundary=" + boundary);
	req->setHeaders(headers);

	std::string str = "";

	// token
	str += "\r\n";
	str += "--" + boundary;
	str += "\r\n";
	str += "Content-Disposition:form-data; name=\"token\"";
	str += "\r\n\r\n";
    str += token;
	str += "\r\n";

	// key
	str += "--" + boundary;
	str += "\r\n";
	str += "Content-Disposition:form-data; name=\"key\"";
	str += "\r\n\r\n";
	str += key;

	std::string strdata = strBin;
	str += "\r\n--" + boundary + "\r\n";
	str = str + "Content-Disposition:form-data; name=\"file\"; filename=\"" + key + "\"\r\n";
	str = str + "Content-Type:application/octet-stream\r\n";
	str = str + "Content-Transfer-Encoding: binary\r\n\r\n";
	str = str + strBin;
	str = str + "\r\n--" + boundary + "--\r\n";

	req->setRequestData(str.data(), str.size());

	CCLOG("req data:%s", req->getRequestData());
	CCLOG("str data = %s \n str .size = %lu \n", str.data(), str.size());

	http->send(req);

	req->release();

}

//size_t uploadFile::write_data(uint8_t *dataBack, size_t size, size_t nmemb, void *user_p)
//{
//	string szData = string((char*)dataBack);
//
//	return 0;
//}