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You can apply these attributes to data types in a typedef statement to further define the usage or effect of the data type.
| Attribute | Usage |
|---|---|
| context_handle | Identifies a binding handle that maintains state (context) information on a particular server between remote procedure calls from a particular client. Not valid for object interface functions. |
| handle | Specifies a custom handle type specific to the application. |
| ms_union | Controls the NDR alignment of nonencapsulated unions. Use on typedefs for backward compatibility with interfaces built with MIDL 1.0 or 2.0. |
| pipe | Allows transmission of an open-ended stream of typed data across a remote procedure call. An in pipe parameter allows the server to pull the data stream from the client during a remote procedure call. An out pipe parameter allows the server to push the data stream back to the client. |
| transmit_as | Specifies how a data type will be transmitted over a network, used for custom marshaling. |
| v1_enum | Directs that the specified enumerated type be transmitted as a 32-bit entity, rather than the 16-bit default. |
| wire_marshal | Similar to transmit_as but you implement the routines to size, marshal, unmarshal, and free the data. |