Loading Message from within ADO Stream Objects

To load a serialized message into a CDO Message object from within 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
' ..
Function LoadMessageFromFile(Path As String) As Message
    Dim Stm As New Stream
    Stm.Open
    Stm.LoadFromFile Path
    Dim iMsg As New CDO.Message
    Dim iDsrc As IDataSource
    Set iDsrc = iMsg
    iDsrc.OpenObject Stm, "_Stream"
    Set LoadMessageFromFile = iMsg
End Function

[C++,IDL]

#import "c:\program files\common files\system\ado\msado15.dll" no_namespace
#import "c:\exchsrvr\cdoex.dll" no_namespace
// ...
IMessagePtr Load_Message_from_File(_bstr_t path)
{
      /*
      ** This example shows a common use of the ADO Stream
      ** object with CDO, namely, opening a serialized
      ** message from a file on disk and loading it into
      ** a CDO Message object.
      **/

      _StreamPtr  pStm(__uuidof(Stream));
      _variant_t varOptional(DISP_E_PARAMNOTFOUND,VT_ERROR);
      try {
            pStm->raw_Open(varOptional, adModeUnknown, adOpenStreamUnspecified,NULL,NULL);
            pStm->LoadFromFile(path);
      }
      catch(_com_error e)
      {
            throw e;
      }

      IMessagePtr iMsg(__uuidof(Message));
      IDataSourcePtr iDsrc;
      iDsrc = iMsg;

      try {
            iDsrc->OpenObject(pStm,_bstr_t("_Stream"));
      }
      catch(_com_error e)
      {
            throw e;
      }


      // ....

      return iMsg;
}

[VBScript]

Function LoadMessageFromFile(Path) As Message
    Dim Stm
    Set Stm = CreateObject("ADODB.Stream")
    Stm.Open
    Stm.LoadFromFile Path
    Dim iMsg
    Set iMsg = CreateObject("CDO.Message")
    Dim iDsrc
    Set iDsrc = iMsg
    iDsrc.OpenObject Stm, "_Stream"
    Set LoadMessageFromFile = iMsg
End Function

Loading Messages from within ADO Stream Objects