MFC通過Http post數據到web端（項目實戰，親測有效）

1、定義連接對象　（對象定義在.h文件中）

//定義Http請求傳輸對象
    CHttpConnection* m_pConnection;
    CHttpFile* m_pFile;
    CInternetSession sess;//Create session 

2、實現：

參數：

　LPCTSTR strMethod：請求的方式是Post還是Get；

　LPCTSTR strUrl：請求的web地址；

　CString  strPostData：上傳的數據；

   CString &strResponse：獲取返回值；

CString CWebJNDataOcxCtrl::ExecuteRequest( LPCTSTR strMethod, LPCTSTR strUrl, CString  strPostData, CString &strResponse )
{
    
    CString strServer;  
    CString strObject;  
    DWORD dwServiceType;  
    INTERNET_PORT nPort;  
    strResponse = _T("");  
    CString strState = _T("");
     
    
    AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort);  //解析url

    //判斷協議類型是否為http或https
    if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)  
    {  
        //LoggerCio::notice(LoggerCio::LOG_URL,"*** url 非http或https 協議！");//log輸出
        return _T("不是http協議");
    }    
    try  
    {   
        //CHttpConnection *m_pConnection;//定義在頭文件
        //獲取 CHttpConnection*
        m_pConnection = sess.GetHttpConnection(strServer ,nPort);  
        //獲取 CHttpFile*
        m_pFile = m_pConnection->OpenRequest(strMethod, strObject,NULL, 1, NULL, NULL,INTERNET_FLAG_EXISTING_CONNECT);  

        m_pFile -> AddRequestHeaders( _T("Accept:application/json;"));
        m_pFile -> AddRequestHeaders( _T("Content-Type:application/json;charset=utf-8;"));
        m_pFile -> AddRequestHeaders( _T("Content-Type:multipart/form-data;"));     

        USES_CONVERSION;
        char *pData = T2A(strPostData);
        if (NULL == m_pFile)
        {
            //LOG_FUNC_QUIT_DEBUG(LOG_SYS);
            return _T("Open Error！");  
        }
        //發送請求
        
        if(m_pFile->SendRequest(NULL, 0,pData,strlen(pData)))
        {
            char szChars[BUFFER_SIZE + 1] = {0};
            string strRawResponse = "";
            UINT nReaded = 0;  
            CString str = _T("");
            while ((nReaded = m_pFile->Read((void*)szChars, BUFFER_SIZE)) > 0)
            {//接收返回
                szChars[nReaded] = '\0';
                strRawResponse += szChars;
                str = strRawResponse.c_str();
                strResponse = CallBackState(str, strPostData);
                //AfxMessageBox(strResponse, MB_ICONINFORMATION);
                strState = strResponse;
                memset(szChars, 0, BUFFER_SIZE + 1);
            }

            //將多字符轉寬字節存為 CString
            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);  
            CString cs(pUnicode);
            delete []pUnicode;
            pUnicode = NULL;

            strResponse = cs;
            return strState;  //成功
        }
        else{//請求失敗打印錯誤碼
            DWORD dwError = GetLastError();  
            //LoggerCio::notice(LoggerCio::LOG_URL,"*** m_pFile->SendRequest 失敗，GetLastError=%d",dwError);
            return _T("請求失敗");  //錯誤    
        }
    }  
    catch (CInternetException* e)  
    {  //捕獲CInternetException異常 
        DWORD dwErrorCode = e->m_dwError;  
        e->Delete();  
        e = NULL;
        strState = _T("4");
        DWORD dwError = GetLastError();  
        return strState;
    }
}