C++通过HTTP请求Get或Post方式请求Json数据
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http://www.cnblogs.com/shike8080/p/6549339.html
http://www.cnblogs.com/liaocheng/p/4243731.html
#pragma once#include <iostream>#include <windows.h>#include <wininet.h>using namespace std;//每次读取的字节数#define READ_BUFFER_SIZE 4096enum HttpInterfaceError{ Hir_Success = 0, //成功 Hir_InitErr, //初始化失败 Hir_ConnectErr, //连接HTTP服务器失败 Hir_SendErr, //发送请求失败 Hir_QueryErr, //查询HTTP请求头失败 Hir_404, //页面不存在 Hir_IllegalUrl, //无效的URL Hir_CreateFileErr, //创建文件失败 Hir_DownloadErr, //下载失败 Hir_QueryIPErr, //获取域名对应的地址失败 Hir_SocketErr, //套接字错误 Hir_UserCancel, //用户取消下载 Hir_BufferErr, //文件太大，缓冲区不足 Hir_HeaderErr, //HTTP请求头错误 Hir_ParamErr, //参数错误，空指针，空字符 Hir_UnknowErr,};enum HttpRequest{ Hr_Get, Hr_Post};class CWininetHttp{public: CWininetHttp(void); ~CWininetHttp(void);public: // 通过HTTP请求：Get或Post方式获取JSON信息 [3/14/2017/shike] const std::string RequestJsonInfo( const std::string& strUrl, HttpRequest type = Hr_Get, std::string lpHeader = "", std::string lpPostData = "");protected: // 解析卡口Json数据 [3/14/2017/shike] void ParseJsonInfo(const std::string &strJsonInfo); // 关闭句柄 [3/14/2017/shike] void Release(); // 释放句柄 [3/14/2017/shike] void ReleaseHandle( HINTERNET& hInternet ); // 解析URL地址 [3/14/2017/shike] void ParseURLWeb( std::string strUrl, std::string& strHostName, std::string& strPageName, WORD& sPort); // UTF-8转为GBK2312 [3/14/2017/shike] char* UtfToGbk(const char* utf8);private: HINTERNET m_hSession; HINTERNET m_hConnect; HINTERNET m_hRequest; HttpInterfaceError m_error;};/*************************************************File name : WininetHttp.cppDescription: 通过URL访问HTTP请求方式获取JSONAuthor : shikeVersion : 1.0Date : 2016/10/27Copyright (C) 2016 - All Rights Reserved*************************************************/#include "WininetHttp.h"//#include "Common.h"#include <json/json.h>#include <fstream>#include "common/CVLog.h"#pragma comment(lib, "Wininet.lib")#include <tchar.h>using namespace std;extern CCVLog CVLog;CWininetHttp::CWininetHttp(void):m_hSession(NULL),m_hConnect(NULL),m_hRequest(NULL){}CWininetHttp::~CWininetHttp(void){ Release();}// 通过HTTP请求：Get或Post方式获取JSON信息 [3/14/2017/shike]const std::string CWininetHttp::RequestJsonInfo(const std::string& lpUrl, HttpRequest type/* = Hr_Get*/, std::string strHeader/*=""*/, std::string strPostData/*=""*/){ std::string strRet = ""; try { if ( lpUrl.empty()) { throw Hir_ParamErr; } Release(); m_hSession = InternetOpen(_T("Http-connect"), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, NULL); //局部 if ( NULL == m_hSession ) { throw Hir_InitErr; } INTERNET_PORT port = INTERNET_DEFAULT_HTTP_PORT; std::string strHostName = ""; std::string strPageName = ""; ParseURLWeb(lpUrl, strHostName, strPageName, port); printf("lpUrl:%s,\nstrHostName:%s,\nstrPageName:%s,\nport:%d\n",lpUrl.c_str(),strHostName.c_str(),strPageName.c_str(),(int)port); m_hConnect = InternetConnectA(m_hSession, strHostName.c_str(), port, NULL, NULL, INTERNET_SERVICE_HTTP, NULL, NULL); if ( NULL == m_hConnect ) { throw Hir_ConnectErr; } std::string strRequestType; if ( Hr_Get == type ) { strRequestType = "GET"; } else { strRequestType = "POST"; } m_hRequest = HttpOpenRequestA(m_hConnect,strRequestType.c_str(), strPageName.c_str(),"HTTP/1.1", NULL, NULL, INTERNET_FLAG_RELOAD, NULL); if ( NULL == m_hRequest ) { throw Hir_InitErr; } DWORD dwHeaderSize = (strHeader.empty()) ? 0 : strlen(strHeader.c_str()); BOOL bRet = FALSE; if ( Hr_Get == type ) { bRet = HttpSendRequestA(m_hRequest,strHeader.c_str(),dwHeaderSize,NULL, 0); } else { DWORD dwSize = (strPostData.empty()) ? 0 : strlen(strPostData.c_str()); bRet = HttpSendRequestA(m_hRequest,strHeader.c_str(),dwHeaderSize,(LPVOID)strPostData.c_str(), dwSize); } if ( !bRet ) { throw Hir_SendErr; } char szBuffer[READ_BUFFER_SIZE + 1] = {0}; DWORD dwReadSize = READ_BUFFER_SIZE; if ( !HttpQueryInfoA(m_hRequest, HTTP_QUERY_RAW_HEADERS, szBuffer, &dwReadSize, NULL) ) { throw Hir_QueryErr; } if ( NULL != strstr(szBuffer, "404") ) { throw Hir_404; } while( true ) { bRet = InternetReadFile(m_hRequest, szBuffer, READ_BUFFER_SIZE, &dwReadSize); if ( !bRet || (0 == dwReadSize) ) { break; } szBuffer[dwReadSize]='\0'; strRet.append(szBuffer); } } catch(HttpInterfaceError error) { m_error = error; } return std::move(strRet);}// 解析Json数据 [11/8/2016/shike]void CWininetHttp::ParseJsonInfo(const std::string &strJsonInfo){ Json::Reader reader; //解析json用Json::Reader Json::Value value; //可以代表任意类型 if (!reader.parse(strJsonInfo, value)) { CVLog.LogMessage(LOG_LEVEL_ERROR,"[CXLDbDataMgr::GetVideoGisData] Video Gis parse data error..."); } if (!value["result"].isNull()) { int nSize = value["result"].size(); for(int nPos = 0; nPos < nSize; ++nPos) //对数据数组进行遍历 { //PGCARDDEVDATA stru ; //stru.strCardName = value["result"][nPos]["tollgateName"].asString(); //stru.strCardCode = value["result"][nPos]["tollgateCode"].asString(); //std::string strCDNum = value["result"][nPos]["laneNumber"].asString(); //增加:车道总数 //stru.nLaneNum = atoi(strCDNum.c_str()); //std::string strLaneDir = value["result"][nPos]["laneDir"].asString(); //增加:车道方向,进行规则转换 //stru.strLaneDir = TransformLaneDir(strLaneDir); //stru.dWgs84_x = value["result"][nPos]["wgs84_x"].asDouble(); //stru.dWgs84_y = value["result"][nPos]["wgs84_y"].asDouble(); //stru.dMars_x = value["result"][nPos]["mars_x"].asDouble(); //stru.dMars_y = value["result"][nPos]["mars_y"].asDouble(); //lstCardDevData.emplace_back(stru); } }}// 解析URL地址 [3/14/2017/shike]void CWininetHttp::ParseURLWeb( std::string strUrl, std::string& strHostName, std::string& strPageName, WORD& sPort){ sPort = 80; string strTemp(strUrl); std::size_t nPos = strTemp.find("http://"); if (nPos != std::string::npos) { strTemp = strTemp.substr(nPos + 7, strTemp.size() - nPos - 7); } nPos = strTemp.find('/'); if ( nPos == std::string::npos ) //没有找到 { strHostName = strTemp; } else { strHostName = strTemp.substr(0, nPos); } std::size_t nPos1 = strHostName.find(':'); if ( nPos1 != std::string::npos ) { std::string strPort = strTemp.substr(nPos1 + 1, strHostName.size() - nPos1 - 1); strHostName = strHostName.substr(0, nPos1); sPort = (WORD)atoi(strPort.c_str()); } if ( nPos == std::string::npos ) { return ; } strPageName = strTemp.substr(nPos, strTemp.size() - nPos);}// 关闭句柄 [3/14/2017/shike]void CWininetHttp::Release(){ ReleaseHandle(m_hRequest); ReleaseHandle(m_hConnect); ReleaseHandle(m_hSession);}// 释放句柄 [3/14/2017/shike]void CWininetHttp::ReleaseHandle( HINTERNET& hInternet ){ if (hInternet) { InternetCloseHandle(hInternet); hInternet = NULL; }}// UTF-8转为GBK2312 [3/14/2017/shike]char* CWininetHttp::UtfToGbk(const char* utf8){ int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0); wchar_t* wstr = new wchar_t[len+1]; memset(wstr, 0, len+1); MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len); len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL); char* str = new char[len+1]; memset(str, 0, len+1); WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL); if(wstr) delete[] wstr; return str;}WinInet实现的HTTP接口/WinHttp实现的HTTP接口/Socket实现的HTTP接口/下载文件，使用回调接口获取下载进度，这些代码可以在开源中获取到；
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