Rules for Multiple Pipes

You can combine in, out, and in,out pipe parameters in any combination in a single call but you must process the pipes in a specific order, as shown in the following example:

• Get the data from every input pipe, starting with the first (leftmost) in parameter, and continuing in order, draining each pipe before beginning to process the next.
• After every input pipe has been completely processed, send the data for the output pipes, again starting with the first out parameter, and continuing in order, filling each pipe before beginning to process the next.

//in .IDL file:
void InOutUCharPipe( [in,out] UCHAR_PIPE *uchar_pipe_1, 
                     [out] UCHAR_PIPE * uchar_pipe_2, 
                     [in] UCHAR_PIPE uchar_pipe_3);
 
//remote procedure:
void InOutUCharPipe( UCHAR_PIPE *param1,
                     UCHAR_PIPE *param2,
                     UCHAR_PIPE  param3)
{
while(!END_OF_PIPE1){
  param1->pull (. . .)
. . .
};
while(!END_OF_PIPE3){
  param3.pull (. . .)
. . .
};
while(!END_OF_PIPE1){
  param1->push (. . .)
. . .
};
while(!END_OF_PIPE2){
  param2->push(. . .)
. . .
};
return;
} //end InOutUCharPipe