How To Use CDO 1.x/VC++ to Get Properties on Received Messages

MORE INFORMATION

The following code opens the first message it finds in the Inbox then retrieves the Senders Name and Message Body. These fields are selected merely for demonstration; they are not the only fields that you can retrieve.

NOTE: This code references Cdo.dll, which is CDO 1.2x. If you are using CDO 1.1, you need to change the #import as follows:

   #import "olemsg32.dll" no_namespace
				

Sample Code

   // Import the lib to generate the SmartPointers.
   #import "cdo.dll" no_namespace

   #include <stdio.h>
   #include <tchar.h>

   // Setup Error Handling.
   void dump_com_error(_com_error &e)
   {
      _tprintf(_T("Oops - hit an error!\n"));
      _tprintf(_T("\a\tCode = %08lx\n"), e.Error());
      _tprintf(_T("\a\tCode meaning = %s\n"), e.ErrorMessage());
      _bstr_t bstrSource(e.Source());
      _bstr_t bstrDescription(e.Description());
      _tprintf(_T("\a\tSource = %s\n"), (LPCTSTR) bstrSource);
      _tprintf(_T("\a\tDescription = %s\n"), (LPCTSTR) bstrDescription);
   }

   // Initialize COM.
   // If this is placed in the scope of the smart pointers, they must be
   // explicitly Release(d) before CoUninitialize() is called.  If any
   // reference count is non-zero, a protection fault occurs.
   struct StartOle {
      StartOle() { CoInitialize(NULL); }
      ~StartOle() { CoUninitialize(); }
   } _inst_StartOle;

   void main(int argc, char *argv[])
   {
      try
      {
         // Create a Session and Logon.
         _SessionPtr pSession("MAPI.Session");
         pSession->Logon();

         // Get a Message.
         FolderPtr     pFolder = pSession->Inbox;
         MessagesPtr   pMessages = pFolder->Messages;
         MessagePtr    pMessage = pMessages->GetFirst();

         if (pMessage!=NULL)
         {
            char              rgch[256];
            AddressEntryPtr   pAESender = pMessage->Sender;
            // Convert UNICODE return from multi to single byte value.
            WideCharToMultiByte(CP_ACP,
                                0,
                                pAESender->Name.bstrVal,
                                -1,
                                rgch,
                                sizeof(rgch),
                                NULL,
                                NULL);
            // Display the Senders Name.
            MessageBox(NULL, rgch, "Sent By", MB_OK);

            // Display message text.
            try
            {
               // Wrap the following code into a try/catch because...
               // If the PR_BODY field is not present in the underlying
               // MAPI Message, the WideCharToMultiByte function
               // yields a MAPI_E_NOT_FOUND when trying to access the CDO
               // Message->Text property. You will generally want to
               // follow this approach for each property accessed.
               // 
               char   strMessageText[1024];
               // Convert UNICODE return from multi to single byte value.
               WideCharToMultiByte(CP_ACP,
                                   0,
                                   pMessage->Text.bstrVal,
                                   -1,
                                   strMessageText,
                                   sizeof(strMessageText),
                                   NULL,
                                   NULL);


               // Display the Message Body.
               MessageBox(NULL, strMessageText, "Body", MB_OK);
            }
            catch (_com_error &e)
            {
               // Put appropriate error condition code here.
            }
         }
         else
            MessageBox(NULL, "No messages found", "Inbox", MB_OK);

         // Logoff the Active Messaging MAPI Session.
         pSession->Logoff();
      }
      catch (_com_error &e)
      {
        dump_com_error(e);
      }
   }