This example handles the client side of a pipe. It opens an existing named pipe, sends a message to the host, reads the host reply, queries and displays the pipe name, and finally closes the pipe.
Before running this example, compile and run the example code shown in the DosConnectNPipe, DosCreateNPipe, DosDisConnectNPipe, or DosSetNPipeSem functions, which handles the host side of the pipe.
#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 message[256] = ""; /* 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}}; int i = 0; rc = DosOpen("\\PIPE\\EXAMPLE", &PipeHandle, &Action, 0, 0, FILE_OPEN, OPEN_ACCESS_READWRITE | OPEN_SHARE_DENYREADWRITE | OPEN_FLAGS_FAIL_ON_ERROR, NULL); if (rc != NO_ERROR) { printf("DosOpen error: error code = %u\n", rc); return 1; } else printf("Connected to Pipe.\n"); printf("Enter message to send to HOST: "); fflush(NULL); /* Force printf to display */ gets(message); rc = DosWrite(PipeHandle, message, strlen(message), &bytes); if (rc != NO_ERROR) { printf("DosWrite error: error code = %u\n", rc); return 1; } rc = DosRead(PipeHandle, message, sizeof(message), &bytes); if (rc != NO_ERROR) { printf("DosRead error: error code = %u\n", rc); return 1; } printf("\nMessage received from PIPEHOST: %s\n\n", message); rc = DosQueryNPipeInfo(PipeHandle, 1L, &PipeBuffer, sizeof(PIPEINFO)*4); if (rc == NO_ERROR) { printf("The pipe's name is %s\n", PipeBuffer[0].szName); } rc = DosClose(PipeHandle); /* Should verify that (rc != NO_ERROR) here... */ printf("...Disconnected\n"); return NO_ERROR; }