Windows进程间通信—命名管道

#include "stdafx.h" #include <windows.h> #include <strsafe.h> #define BUFSIZE 4096  DWORD WINAPI 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  0, // 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  InstanceThread, // thread proc  (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; } DWORD WINAPI 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; printf((const char*)chRequest); 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); return 1; } VOID GetAnswerToRequest(LPTSTR chRequest, LPTSTR chReply, LPDWORD pchBytes) { _tprintf( TEXT("%s\n"), chRequest ); StringCchCopy( chReply, BUFSIZE, TEXT("Default answer from server") ); *pchBytes = (lstrlen(chReply)+1)*sizeof(TCHAR); } /* 何问起 hovertree.com */

#include "stdafx.h" #include <windows.h> #include <conio.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; } // 何问起 hovertree.com // 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; }