[WIN3232] 프로세스 간 통신 ( named Pip 사용 )

[클라이언트]

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

#define BUFSIZE 512
 
int _tmain(int argc, TCHAR *argv[]) 
{ 
   HANDLE hPipe; 
   LPTSTR lpvMessage=TEXT("Default message from client"); 
   TCHAR chBuf[BUFSIZE]; 
   BOOL fSuccess; 
   DWORD cbRead, cbWritten, dwMode; 
   LPTSTR lpszPipename = TEXT("\\\\.\\pipe\\mynamedpipe"); 

   if( argc > 1 )
      lpvMessage = argv[1];
 
// Try to open a named pipe; wait for it, if necessary. 
 
   while (1) 
   { 
      hPipe = CreateFile( 
         lpszPipename,   // pipe name 
         GENERIC_READ |  // read and write access 
         GENERIC_WRITE, 
         0,              // no sharing 
         NULL,           // default security attributes
         OPEN_EXISTING,  // opens existing pipe 
         0,              // default attributes 
         NULL);          // no template file 
 
   // Break if the pipe handle is valid. 
 
      if (hPipe != INVALID_HANDLE_VALUE) 
         break; 
 
      // Exit if an error other than ERROR_PIPE_BUSY occurs. 
 
      if (GetLastError() != ERROR_PIPE_BUSY) 
      {
         printf("Could not open pipe"); 
         return 0;
      }
 
      // All pipe instances are busy, so wait for 20 seconds. 
 
      if (!WaitNamedPipe(lpszPipename, 20000)) 
      { 
         printf("Could not open pipe"); 
         return 0;
      } 
   } 
 
// The pipe connected; change to message-read mode. 
 
   dwMode = PIPE_READMODE_MESSAGE; 
   fSuccess = SetNamedPipeHandleState( 
      hPipe,    // pipe handle 
      &dwMode,  // new pipe mode 
      NULL,     // don't set maximum bytes 
      NULL);    // don't set maximum time 
   if (!fSuccess) 
   {
      printf("SetNamedPipeHandleState failed"); 
      return 0;
   }
 
// Send a message to the pipe server. 
 
   fSuccess = WriteFile( 
      hPipe,                  // pipe handle 
      lpvMessage,             // message 
      (lstrlen(lpvMessage)+1)*sizeof(TCHAR), // message length 
      &cbWritten,             // bytes written 
      NULL);                  // not overlapped 
   if (!fSuccess) 
   {
      printf("WriteFile failed"); 
      return 0;
   }
 
   do 
   { 
   // Read from the pipe. 
 
      fSuccess = ReadFile( 
         hPipe,    // pipe handle 
         chBuf,    // buffer to receive reply 
         BUFSIZE*sizeof(TCHAR),  // size of buffer 
         &cbRead,  // number of bytes read 
         NULL);    // not overlapped 
 
      if (! fSuccess && GetLastError() != ERROR_MORE_DATA) 
         break; 
 
      _tprintf( TEXT("%s\n"), chBuf ); 
   } while (!fSuccess);  // repeat loop if ERROR_MORE_DATA 

   getch();
 
   CloseHandle(hPipe); 
 
   return 0; 
}

[서버]

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

#define BUFSIZE 4096
 
VOID InstanceThread(LPVOID); 
VOID GetAnswerToRequest(LPTSTR, LPTSTR, LPDWORD); 
 
int _tmain(VOID) 
{ 
   BOOL fConnected; 
   DWORD dwThreadId; 
   HANDLE hPipe, hThread; 
   LPTSTR lpszPipename = TEXT("\\\\.\\pipe\\mynamedpipe"); 
 
// The main loop creates an instance of the named pipe and 
// then waits for a client to connect to it. When the client 
// connects, a thread is created to handle communications 
// with that client, and the loop is repeated. 
 
   for (;;) 
   { 
      hPipe = CreateNamedPipe( 
          lpszPipename,             // pipe name 
          PIPE_ACCESS_DUPLEX,       // read/write access 
          PIPE_TYPE_MESSAGE |       // message type pipe 
          PIPE_READMODE_MESSAGE |   // message-read mode 
          PIPE_WAIT,                // blocking mode 
          PIPE_UNLIMITED_INSTANCES, // max. instances  
          BUFSIZE,                  // output buffer size 
          BUFSIZE,                  // input buffer size 
          NMPWAIT_USE_DEFAULT_WAIT, // client time-out 
          NULL);                    // default security attribute 

      if (hPipe == INVALID_HANDLE_VALUE) 
      {
          printf("CreatePipe failed"); 
          return 0;
      }
 
      // Wait for the client to connect; if it succeeds, 
      // the function returns a nonzero value. If the function
      // returns zero, GetLastError returns ERROR_PIPE_CONNECTED. 
 
      fConnected = ConnectNamedPipe(hPipe, NULL) ? 
         TRUE : (GetLastError() == ERROR_PIPE_CONNECTED); 
 
      if (fConnected) 
      { 
      // Create a thread for this client. 
         hThread = CreateThread( 
            NULL,              // no security attribute 
            0,                 // default stack size 
            (LPTHREAD_START_ROUTINE) InstanceThread, 
            (LPVOID) hPipe,    // thread parameter 
            0,                 // not suspended 
            &dwThreadId);      // returns thread ID 

         if (hThread == NULL) 
         {
            printf("CreateThread failed"); 
            return 0;
         }
         else CloseHandle(hThread); 
       } 
      else 
        // The client could not connect, so close the pipe. 
         CloseHandle(hPipe); 
   } 
   return 1; 
} 
 
VOID InstanceThread(LPVOID lpvParam) 
{ 
   TCHAR chRequest[BUFSIZE]; 
   TCHAR chReply[BUFSIZE]; 
   DWORD cbBytesRead, cbReplyBytes, cbWritten; 
   BOOL fSuccess; 
   HANDLE hPipe; 
 
// The thread's parameter is a handle to a pipe instance. 
 
   hPipe = (HANDLE) lpvParam; 
 
   while (1) 
   { 
   // Read client requests from the pipe. 
      fSuccess = ReadFile( 
         hPipe,        // handle to pipe 
         chRequest,    // buffer to receive data 
         BUFSIZE*sizeof(TCHAR), // size of buffer 
         &cbBytesRead, // number of bytes read 
         NULL);        // not overlapped I/O 

      if (! fSuccess || cbBytesRead == 0) 
         break; 
      GetAnswerToRequest(chRequest, chReply, &cbReplyBytes); 
 
   // Write the reply to the pipe. 
      fSuccess = WriteFile( 
         hPipe,        // handle to pipe 
         chReply,      // buffer to write from 
         cbReplyBytes, // number of bytes to write 
         &cbWritten,   // number of bytes written 
         NULL);        // not overlapped I/O 

      if (! fSuccess || cbReplyBytes != cbWritten) break; 
  } 
 
// Flush the pipe to allow the client to read the pipe's contents 
// before disconnecting. Then disconnect the pipe, and close the 
// handle to this pipe instance. 
 
   FlushFileBuffers(hPipe); 
   DisconnectNamedPipe(hPipe); 
   CloseHandle(hPipe); 
}

VOID GetAnswerToRequest(LPTSTR chRequest, 
   LPTSTR chReply, LPDWORD pchBytes)
{
   _tprintf( TEXT("%s\n"), chRequest );
   lstrcpy( chReply, TEXT("Default answer from server") );
   *pchBytes = (lstrlen(chReply)+1)*sizeof(TCHAR);
}

MSDN에서 긁어옴.ㅎ