Sending a Message (with Attachments) with OLEDB and CDOEX

//Sending a Message (w/Attachments) using OLEDB and CDOEx
#include <stdio.h>
#include <conio.h>
#include <string.h> 
#include <activeds.h> 

#import <msado15.dll> no_namespace rename("EOF","adoEOF")
#import <cdoex.dll> no_namespace

struct StartOle 
{
   StartOle() { CoInitialize(NULL); }
   ~StartOle() { CoUninitialize(); }
} _inst_StartOle;

HRESULT GetDomainName(BSTR* bstrDomainName); 

void main(void)
{

   LPSTR lpUser = "User1"; 
   LPSTR  lpAttachment ="C:\\hello.txt";

   _ConnectionPtr conn(_uuidof(Connection));
   _RecordsetPtr MyInbox(_uuidof(Recordset));

   HRESULT hRes = NULL;
   BSTR bstrDomainDNSName; 

   // Get your Domain Name. 
   hRes = GetDomainName(&bstrDomainDNSName); 

   try
   {
      conn->Provider = "Exoledb.DataSource";
   
      _bstr_t strConnString = "file://./backofficestorage/" + (_bstr_t)bstrDomainDNSName + "/MBX/" + (_bstr_t)lpUser + "/Inbox"; 
      printf(strConnString);
      
      hRes = conn->Open(strConnString,"","",0);
      
      if (conn->State == adStateOpen)
         printf("Connection Opened!\n");
      else
         printf("Connection failed!\n");
      
      _bstr_t  strQ = "select * from scope ('shallow traversal of \""+ strConnString + "\"') " ;
   
      hRes = MyInbox->Open(strQ,conn->ConnectionString,adOpenForwardOnly,adLockReadOnly,0);
      
      IConfigurationPtr iConf( __uuidof(Configuration));

      FieldsPtr Flds = iConf->GetFields();
      FieldPtr Fld = Flds->GetItem("https://schemas.microsoft.com/cdo/configuration/sendusing");
       Fld->Value = "cdoSendUsingExchange";

      printf("Configuration object created\n");
      
      IMessagePtr iMsg(__uuidof(Message));
      
      iMsg->put_Configuration(iConf);
      iMsg->put_From("User1@" + (_bstr_t)bstrDomainDNSName);
      iMsg->put_To("User2@" + (_bstr_t)bstrDomainDNSName);
      iMsg->put_Subject(L"Test Subject");
      iMsg->put_TextBody(L"Test Body");
      iMsg->AddAttachment( lpAttachment,"","");
      iMsg->Send();
      printf("Mail Sent\n");
   }
   catch(...)
   {
      printf("Something failed!\n");
   }
   conn = NULL;
}

/*******************************************
// GetDomainName 
// 
// Params: [out] BSTR * bstrDomainName 
// Output: HRESULT 
// Purpose: Retrieve the Domain DNS name. 
********************************************/
HRESULT GetDomainName(BSTR * bstrDomainName) 
{ 
   HRESULT hr = S_OK; 
   IADsADSystemInfo *pADsys;

   hr = CoCreateInstance(   CLSID_ADSystemInfo, 
                     NULL, 
                     CLSCTX_INPROC_SERVER, 
                     IID_IADsADSystemInfo, 
                     (void**)&pADsys); 
   hr = pADsys->get_DomainDNSName(bstrDomainName); 

   if (pADsys) 
      pADsys->Release(); 
   return hr; 
}