C++使用CHttpFile实现Http请求

文章来源：http://blog.csdn.net/thanklife/article/details/72473217

C++实现http请求的代码，参照网上的修改了下在mfc中使用

1、HttpClient.h

 //////////////////////////////////// HttpClient.h
 #ifndef HTTPCLIENT_H
 #define HTTPCLIENT_H

 #include
 #include
 using namespace std;

 #define  IE_AGENT  _T("Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)")

 // 操作成功
 #define SUCCESS        0
 // 操作失败
 #define FAILURE        1
 // 操作超时 www.it165.net
 #define OUTTIME        2

 class CHttpClient
 {
 public:
     CHttpClient(LPCTSTR strAgent = IE_AGENT);
     virtual ~CHttpClient(void);

     int HttpGet(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);
     int HttpPost(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);
     int HttpPut(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);

 private:
     int ExecuteRequest(int strMethod, LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);
     void Clear();


 private:
     CInternetSession *m_pSession;
     CHttpConnection *m_pConnection;
     CHttpFile *m_pFile;
 };

 #endif // HTTPCLIENT_H

2、HttpClient.cpp

 ////////////////////////////////// HttpClient.cpp
 #include "stdafx.h"
 #include "HttpClient.h"

 #define  BUFFER_SIZE       1024

 #define  NORMAL_CONNECT             INTERNET_FLAG_KEEP_CONNECTION
 #define  SECURE_CONNECT                NORMAL_CONNECT | INTERNET_FLAG_SECURE
 #define  NORMAL_REQUEST             INTERNET_FLAG_RELOAD | INTERNET_FLAG_DONT_CACHE
 #define  SECURE_REQUEST             NORMAL_REQUEST | INTERNET_FLAG_SECURE | INTERNET_FLAG_IGNORE_CERT_CN_INVALID

 CHttpClient::CHttpClient(LPCTSTR strAgent)
 {
     m_pSession = new CInternetSession(strAgent);
     m_pConnection = NULL;
     m_pFile = NULL;
 }


 CHttpClient::~CHttpClient(void)
 {
     Clear();
     if (NULL != m_pSession)
     {
         m_pSession->Close();
         delete m_pSession;
         m_pSession = NULL;
     }
 }

 void CHttpClient::Clear()
 {
     if (NULL != m_pFile)
     {
         m_pFile->Close();
         delete m_pFile;
         m_pFile = NULL;
     }

     if (NULL != m_pConnection)
     {
         m_pConnection->Close();
         delete m_pConnection;
         m_pConnection = NULL;
     }
 }

 int CHttpClient::ExecuteRequest(int strMethod, LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
 {
     int result =FAILURE ;
     //WCHAR* wPostData = strPostData.GetBuffer();
     CString strServer;
     CString strObject;
     DWORD dwServiceType;
     INTERNET_PORT nPort;


     AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort);
     if (AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)
     {
         return FAILURE;
     }

     try
     {
         m_pConnection = m_pSession->GetHttpConnection(strServer,
             dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_CONNECT : SECURE_CONNECT,
             nPort);
         m_pFile = m_pConnection->OpenRequest(strMethod, strObject,
             NULL, 1, NULL, NULL,
             (dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_REQUEST : SECURE_REQUEST));

         /*设置请求相关参数*/
         m_pFile->AddRequestHeaders(L"Accept: */*,application/json");//accept请求报头域，表示客户端接受哪些类型的信息
         m_pFile->AddRequestHeaders(L"Accept-Charset:UTF8");
         m_pFile->AddRequestHeaders(L"Accept-Language: zh-cn;q=0.8,en;q=0.6,ja;q=0.4");
         m_pFile->AddRequestHeaders(L"Content-Type:application/json");//content为实体报头域，格式及编码

         //m_pFile->SendRequest(NULL, 0, (LPVOID)(LPCTSTR)strPostData, strPostData == NULL ? 0 : _tcslen(strPostData));

         /*请求body内容先转为UTF-8编码，与服务端保持一致,cword为要发送内容*/
         char*cword; //ANSI指针
         if (strPostData != NULL){
             DWORD  num = WideCharToMultiByte(CP_UTF8, 0, strPostData, -1, NULL, 0, NULL, NULL);//計算這個UNICODE实际由几个UTF-8字組成
             cword = (char*)calloc(num, sizeof(char));   //申请空间
             if (cword == NULL)                          //是否申请
             {
                 free(cword);
             }
             memset(cword, 0, num*sizeof(char));     //初始化
             WideCharToMultiByte(CP_UTF8, 0, strPostData, -1, cword, num, NULL, NULL);
             printf("content长度为%d\n", strlen(cword));
             m_pFile->SendRequest(NULL, 0, cword, strlen(cword));//发送请求
         }
         else{
             m_pFile->SendRequest(NULL, 0, NULL, 0);//发送请求
         }


         DWORD dwRet;
         m_pFile->QueryInfoStatusCode(dwRet);//查询执行状态
         printf("HTTP_STATUS_code:%d\n", dwRet);
         if (dwRet == HTTP_STATUS_OK){//http请求执行失败
             result = SUCCESS;
         }

         /*保存http响应*/
         char szChars[BUFFER_SIZE + 1] = { 0 };
         string strRawResponse = "";
         UINT nReaded = 0;
         while ((nReaded = m_pFile->Read((void*)szChars, BUFFER_SIZE)) > 0)
         {
             szChars[nReaded] = '\0';
             strRawResponse += szChars;
             memset(szChars, 0, BUFFER_SIZE + 1);
         }

         /*utf8转unicode*/
         int unicodeLen = MultiByteToWideChar(CP_UTF8, 0, strRawResponse.c_str(), -1, NULL, 0);
         WCHAR *pUnicode = new WCHAR[unicodeLen + 1];
         memset(pUnicode, 0, (unicodeLen + 1)*sizeof(wchar_t));
         MultiByteToWideChar(CP_UTF8, 0, strRawResponse.c_str(), -1, pUnicode, unicodeLen);
         strResponse = pUnicode;//最终响应结果
         //TRACE(strResponse + L"");
         delete[]pUnicode;
         pUnicode = NULL;

         Clear();
     }
     catch (CInternetException* e)
     {
         Clear();
         DWORD dwErrorCode = e->m_dwError;
         e->Delete();

         DWORD dwError = GetLastError();

         printf("dwError = %d", dwError, 0);

         strResponse = L"CInternetException\n";

         if (ERROR_INTERNET_TIMEOUT == dwErrorCode)
         {
             return OUTTIME;
         }
         else
         {
             return FAILURE;
         }
     }
     return result;
 }

 int CHttpClient::HttpGet(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
 {
     return ExecuteRequest(CHttpConnection::HTTP_VERB_GET, strUrl, NULL, strResponse);
 }

 int CHttpClient::HttpPost(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
 {
     return ExecuteRequest(CHttpConnection::HTTP_VERB_POST, strUrl, strPostData, strResponse);
 }
 int CHttpClient::HttpPut(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
 {
     return ExecuteRequest(CHttpConnection::HTTP_VERB_PUT, strUrl, strPostData, strResponse);
 }