notify attribute

The [notify] attribute instructs the MIDL compiler to generate a call to a [notify] procedure on the server side of the application.

[notify] procedure-name();



The name of the remote procedure with which the notify procedure will be associated.


The [notify] procedure called as a result of the [notify] attribute is associated with a particular remote procedure on the server. It is similar in concept to a callback function. The stub calls the [notify] procedure after all the output arguments of the remote procedure with which it is associated have been marshaled and any memory associated with the parameters is freed. The [notify] routine is called if a call fails before the server routine executes. For example, if a server fails during unmarshaling due to receipt of bad data from the client, the [notify] routine is called.

The [notify] attribute is useful to develop applications acquiring resources in remote procedures. These resources are then freed in the [notify] procedure after the output parameters of the remote procedure are fully marshaled.

The [notify] procedure name is the name of the remote procedure suffixed by _notify. The _notify procedure does not require any parameters and does not return a result. A prototype of this procedure is also generated in the header file. For example, if the IDL file contains the following:

MyProcedure([in] short S);

Specify the following in the ACF for MIDL to generate the _notify call:

[notify] MyProcedure();

The MIDL compiler will generate server stub code which contains the following call to the _notify procedure:


The header file will contain a prototype:

void MyProcedure_notify(void);


[notify] MyProcedure();

See also

Application Configuration File (ACF)



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