WinAPI / IPC 메일슬롯 단방향 통신 예제

/*

 * http://sosal.kr/

 * made by so_Sal

 */

Windows 08. IPC 프로세스간 통신
예제소스 입니다.
잘 이해가 안되는 부분이 있다면
아래 링크를 참조하세요.
LINK_

======================= Receiver =======================

#include<stdio.h>
#include<tchar.h>
#include<windows.h>

#define SLOT_NAME _T("\\\\.\\mailslot\\Mail")

int _tmain(int argc,TCHAR *argv[]){

 HANDLE hMailSlot;
 TCHAR messageBox[BUFSIZ];
 DWORD bytesRead;

 hMailSlot = CreateMailslot(     //우체통 생성!!
  SLOT_NAME, 0,
  MAILSLOT_WAIT_FOREVER,
  NULL );

 if(hMailSlot == INVALID_HANDLE_VALUE){
  _fputts( _T("Unable to create MailSlot ! \n"), stdout);
  return 1;
 }

 _fputts( _T("=========== Message =========== \n"),stdout);

 while(1){
  if(!ReadFile(hMailSlot, messageBox, BUFSIZ, &bytesRead,NULL)){
   _fputts( _T("Unable to read 1 \n"), stdout);    // 글이 들어올때까지 기다리고
   CloseHandle(hMailSlot);                              // 들어오면 읽어버림
   return 1;
  }

  if(!_tcsncmp(messageBox, _T("EXIT"), 4)){
   _fputts(_T("Good bye ! \n"), stdout);
   break;
  }

  messageBox[bytesRead/sizeof(TCHAR)] = NULL;
  _fputts(_T("Sender :: "),stdout);
  _fputts(messageBox,stdout);            // 읽어버린거 출력!
 }

 CloseHandle(hMailSlot);
 return 0;
}

======================= Sender =======================

#include<stdio.h>
#include<tchar.h>
#include<windows.h>

#define SLOT_NAME _T("\\\\.\\mailslot\\Mail")

int _tmain(int argc,TCHAR *argv[]){

 HANDLE hMailSlot;
 TCHAR message[BUFSIZ];
 DWORD bytesWritten;

 hMailSlot = CreateFile(       // 우체통에 글쓰려구 파일처럼 취급
  SLOT_NAME,GENERIC_WRITE,
  FILE_SHARE_READ,
  NULL,
  OPEN_EXISTING,
  FILE_ATTRIBUTE_NORMAL,
  NULL
 );

 if(hMailSlot == INVALID_HANDLE_VALUE){
  _fputts( _T("Unable to create mailslot ! \n"), stdout);
  return 1;
 }

 while(1){
  _fputts(_T("shell) "), stdout);
  _fgetts(message,sizeof(message)/sizeof(TCHAR), stdin);

  if(!WriteFile(hMailSlot,message,          //우체통에 글을 써버림.
   _tcslen(message)*sizeof(TCHAR), &bytesWritten, NULL)){
    _fputts( _T("Unable to write ! "), stdout);
    CloseHandle(hMailSlot);
    return 1;
  }

  if(!_tcscmp(message, _T("EXIT"))){    //입력문자열이 EXIT 면 끝!
   _fputts(_T("Good Bye!"), stdout);
   break;
  }
 }
 CloseHandle(hMailSlot);
 return 0;
}