CDO Messaging COM Interfaces

[This is preliminary documentation and subject to change.]

The CDO for Exchange COM component defines several COM interfaces that are used to construct and manage messages.

The following list shows :

• IBodyPart Interface Defines methods and properties used to manage a body part of a message.
• IMessage Interface Defines methods and properties used to manage a complete message.
• IBodyParts Interface Defines a collection interface used to manage a collection of body parts.

Each interface extends the IDispatch COM interface, and is marked as dual. This means that both a true COM interface (virtual table) and a dispinterface are available to communicate with objects that expose the above interfaces. Such programming languages as Microsoft® Visual C++®, Microsoft® Visual Basic®, Microsoft® Visual J++®, Microsoft® Visual Basic® Scripting Edition (VBScript), and Microsoft® JScript™ can access objects using CDO interfaces.

Other interfaces listed in the reference section of this documentation are used when constructing SMTP/ Network News Transfer Protocol (NNTP) transport event sinks. For more information on , see SMTP/NNTP Transport Event Sinks with CDO.

The following list shows additional CDO COM interfaces:

• ISMTPOnArrival
• INNTPOnPostEarly
• INNTPOnPost
• INNTPOnPostFinal

Important Note   If you are unfamiliar with the concept of interface, class, and object, you might initially have difficulty understanding this documentation. With CDO for Exchange, the distinction between a COM interface and a COM class is essential to understand, as many objects in CDO expose multiple OLE Automation-compatible interfaces.