Saving Messages into ADO Stream Objects

To save a serialized message from a CDO Message object to an ADO Stream object, perform the following steps:

[Visual Basic]

' Reference to Microsoft ActiveX Data Objects 2.5 Library
' Reference to Microsoft CDO for Exchange 2000 Server Library
' ..
Sub SaveMessageToFile(iMsg As CDO.Message, Filepath As String)
    Dim Stm As New Stream
    Stm.Open
    Stm.Type = adTypeText
    Stm.Charset = "US-ASCII"
    
    Dim iDsrc As IDataSource
    Set iDsrc = iMsg
    iDsrc.SaveToObject Stm, "_Stream"
    
    Stm.SaveToFile Filepath, adSaveCreateOverWrite
    
End Sub

[C++,IDL]

#import "c:\program files\common files\system\ado\msado15.dll" no_namespace
#import "c:\exchsrvr\cdoex.dll" no_namespace
// ...
void Save_Message_to_File(IMessagePtr iMsg, bstr_t filename)
{
      /*
      ** This example shows a common use of the ADO Stream
      ** object with CDO, namely, saving a serialized
      ** message to disk using an ADO Stream object.
      **/
      _StreamPtr  pStm(__uuidof(Stream));
      IDataSourcePtr iDsrc;
      iDsrc = iMsg;

      _variant_t varOptional(DISP_E_PARAMNOTFOUND,VT_ERROR);
      pStm->raw_Open(varOptional, adModeUnknown, adOpenStreamUnspecified,NULL,NULL);
      pStm->Type = adTypeText;
      pStm->Charset = "US-ASCII"; // apparently, we need this!
      try 
      {      
            iDsrc->SaveToObject(pStm,_bstr_t("_Stream"));
      }
      catch(_com_error error)
      {
            throw error;
      }

      try {
            pStm->SaveToFile(filename,adSaveCreateOverWrite);
      }
      catch(_com_error e)
      {
            throw e;
      }
}

[VBScript]

Sub SaveMessageToFile(iMsg, Filepath)
    Dim Stm
    Set Stm = CreateObject("ADODB.Stream")
    Stm.Open
    Stm.Type = adTypeText ' 2
    Stm.Charset = "US-ASCII"
    
    Dim iDsrc
    Set iDsrc = iMsg.DataSource
    iDsrc.SaveToObject Stm, "_Stream"
    
    Stm.SaveToFile Filepath, adSaveCreateOverWrite
    
End Sub