MFC通过Http post数据到web端（项目实战，亲测有效）

1、定义连接对象　（对象定义在.h文件中）

//定义Http请求传输对象
    CHttpConnection* m_pConnection;
    CHttpFile* m_pFile;
    CInternetSession sess;//Create session 

2、实现：

参数：

　LPCTSTR strMethod：请求的方式是Post还是Get；

　LPCTSTR strUrl：请求的web地址；

　CString  strPostData：上传的数据；

   CString &strResponse：获取返回值；

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

    //判断协议类型是否为http或https
    if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)  
    {  
        //LoggerCio::notice(LoggerCio::LOG_URL,"*** url 非http或https 协议！");//log输出
        return _T("不是http协议");
    }    
    try  
    {   
        //CHttpConnection *m_pConnection;//定义在头文件
        //获取 CHttpConnection*
        m_pConnection = sess.GetHttpConnection(strServer ,nPort);  
        //获取 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！");  
        }
        //发送请求
        
        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);
            }

            //将多字符转宽字节存为 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{//请求失败打印错误码
            DWORD dwError = GetLastError();  
            //LoggerCio::notice(LoggerCio::LOG_URL,"*** m_pFile->SendRequest 失败，GetLastError=%d",dwError);
            return _T("请求失败");  //错误    
        }
    }  
    catch (CInternetException* e)  
    {  //捕获CInternetException异常 
        DWORD dwErrorCode = e->m_dwError;  
        e->Delete();  
        e = NULL;
        strState = _T("4");
        DWORD dwError = GetLastError();  
        return strState;
    }
}