The following example IDL defines a typical pipe structure, and an asynchronous RPC function with pipes.
//file: Xasyncpipe.idl:
//
interface IMyAsyncPipe
{
//define the pipe type
typedef pipe int aysnc_intpipe ;
//then use it as a parameter
int MyAsyncPipe(handle_t hBinding,
[in] a,
[in] ASYNC_INTPIPE *inpipe,
[out] ASYNC_INTPIPE *outpipe,
[out] int *b) ;
};
//other function declarations
} ;
//other interface definitions
//end Xasyncpipe.idl
//file:Xasyncpipe.acf:
//file: Xasyncpipe.acf:
interface IMyAsyncPipe
{
[async] MyAsyncPipe () ;
} ;
//
//end Xasyncpipe.acf
This is a typical pipe structure definition, containing pointers to push and pull procedures, a buffer to hold the pipe data and a state variable to coordinate the procedures:
//
typedef struct ASYNC_MYPIPE
{
RPC_STATUS (__RPC_FAR * pull) (char __RPC_FAR * state,
small __RPC_FAR * buf,
unsigned long esize,
unsigned long __RPC_FAR * ecount );
RPC_STATUS (__RPC_FAR * push) (char __RPC_FAR * state,
small __RPC_FAR * buf,
unsigned long ecount );
void *Reserved;
char __RPC_FAR * state;
} ASYNC_INTPIPE;