problem with Multiple input and one output Named Pipe

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C

Windows

Hi all,

I have a IPC architecture where in i am using Named pipes,
which has N-input (senders) 1 output(receiver), but the problem is i am able to receive only 1 input data on the output side.

Server side only one receiver:

hPipe = CreateNamedPipe( 
          g_szPipeName,             // pipe name 
          PIPE_ACCESS_DUPLEX,       // 
          PIPE_TYPE_BYTE |       // message type pipe 
          PIPE_READMODE_BYTE |   // message-read mode 
          PIPE_NOWAIT,                // blocking mode 
          PIPE_UNLIMITED_INSTANCES, // max. instances  
          BUFFER_SIZE,              // output buffer size 
          BUFFER_SIZE,              // input buffer size 
          NMPWAIT_USE_DEFAULT_WAIT, // client time-out 
          &sa);                    // default security attribute 

////// Error Handling

//Read client message
     BOOL bResult = ReadFile( 
          hPipe,                // handle to pipe 
          szBuffer,             // buffer to receive data 
          sizeof(szBuffer),     // size of buffer 
          &cbBytes,             // number of bytes read 
          NULL);                // not overlapped I/O 

///////Error Handlimg

Client Side more than 1 Client:

SECURITY_ATTRIBUTES sa;
sa.lpSecurityDescriptor = (PSECURITY_DESCRIPTOR)malloc(SECURITY_DESCRIPTOR_MIN_LENGTH);

InitializeSecurityDescriptor(sa.lpSecurityDescriptor,SECURITY_DESCRIPTOR_REVISION);

// ACL is set as NULL in order to allow all access to the object.
SetSecurityDescriptorDacl(sa.lpSecurityDescriptor, TRUE, NULL, FALSE);

sa.nLength = sizeof(sa);

sa.bInheritHandle = FALSE;

hPipe = CreateFile( 
	g_szPipeName,   // pipe name 
	GENERIC_WRITE, // read and write access 
	0,              // no sharing 
	&sa,           // default security attributes
	OPEN_EXISTING,  // opens existing pipe 
	0,              // default attributes 
	NULL);          // no template file 




DWORD cbBytes;
WriteFile( 
	hPipe,                // handle to pipe 
	pf32InputFrames,
	ppInputConnections[0],
	&cbBytes,             // number of bytes written 
	NULL);                // not overlapped I/O 

By the way this is in VISTA.