midware_ws/NetLib/DingDing/HttpClient.h

#pragma once

#include <string>
#include <codecvt>
// curl 
#define USE_OPENSSL
#define CURL_STATICLIB
#include <curl/curl.h>
#pragma comment(lib, "ws2_32.lib")  
#pragma comment(lib, "wldap32.lib")  
#pragma comment(lib, "libcurl.lib") 
#pragma comment(lib,"Crypt32.lib")

//#include <json/json.h>
//#pragma comment(lib,"jsoncpp_static.lib")

class CHttpClient
{
public:

	CURLcode curl_post_req(const char* url, const char* postParams, std::string &response);

	static CHttpClient* GetInStance() { return &sp; }
private:
	CHttpClient() {};
	CHttpClient(const CHttpClient&);
	CHttpClient& operator = (const CHttpClient&) = delete;
	~CHttpClient() {};

	static size_t  req_reply(void * ptr, size_t size, size_t nmemb, void * stream);

	static std::wstring string_to_wstring(const std::string &s)
	{
		using default_convert = std::codecvt<wchar_t, char, std::mbstate_t>;
		static std::wstring_convert<default_convert>conv(new(std::nothrow) default_convert("CHS"));
		return conv.from_bytes(s);
	}

	static std::string ansi_to_utf8(const std::string &s)
	{
		static std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;
		return conv.to_bytes(string_to_wstring(s));
	}
	static std::string wstring_to_string(const std::wstring &s)
	{
		using default_convert = std::codecvt<wchar_t, char, std::mbstate_t>;
		static std::wstring_convert<default_convert>conv(new(std::nothrow) default_convert("CHS"));
		return conv.to_bytes(s);
	}
	static std::string utf8_to_ansi(const std::string& s)
	{
		static std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;
		return wstring_to_string(conv.from_bytes(s));
	}

	static CHttpClient sp;
};