This example shows how to make a call to an existing named pipe.

Before running this example, compile and run the example code shown in the DosConnectNPipe, DosCreateNPipe, DosDisConnectNPipe, or DosSetNPipeSem functions.

#define INCL_DOSFILEMGR       /* DOS File Manager values */
#define INCL_DOSNMPIPES       /* DOS Named Pipes values */
#define INCL_DOSSEMAPHORES    /* DOS Semaphore values */
#define INCL_DOSERRORS        /* DOS Error values */
#include <os2.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(VOID) {
   APIRET   rc                     = NO_ERROR;   /* Return code */
   CHAR     outmsg[256]            = "";         /* Output message buffer */
   CHAR     inmsg[256]             = "";         /* Input message buffer */
   HFILE    PipeHandle             = NULLHANDLE; /* Pipe handle */
   PIPEINFO PipeBuffer[4]          = {{0}};
   struct   _AVAILDATA  BytesAvail = {0};
   UCHAR    Buffer[200]            = {0};
   ULONG    bytes                  = 0;
   ULONG    Action                 = 0;
   PIPESEMSTATE infobuf[3]         = {{0}};

   printf("Enter message to send to PIPEHOST: ");

   fflush(NULL);   /* Make above printf show on display */
   gets(outmsg);

   rc = DosCallNPipe("\\PIPE\\EXAMPLE",   /* Name of duplex pipe */
                      outmsg,             /* Output message buffer */
                      strlen(outmsg),     /* Size of output message */
                      inmsg,              /* Input message buffer */
                      sizeof(inmsg),      /* Size of input buffer */
                      &bytes,             /* Number of bytes read */
                      30000L);            /* Wait 30 seconds for pipe */
   if (rc != NO_ERROR) {
      printf("DosCallNPipe error: error code = %u\n", rc);
      return 1;
   } else {
      printf("\nMessage received from PIPEHOST: %s\n\n", inmsg);
   } /* endif */

   return NO_ERROR;
}