On 2008-07-03, andrewb <aj*****@deloitte.co.ukwrote:
Thanks for the help guys - appreciate it
I am using Visual Studio 2005, still unable to get a string through -
here is my code, hopefully you can spot my error(s) :
Server code
=========
Dim pipeName As String = "\\.\pipe\MServerPipe"
Dim hPipe As Integer
Dim openMode, pipeMode As Integer
Dim stringIn As String
Dim dataIn(256) As Byte
Dim res, nChars As Integer
openMode = PIPE_ACCESS_DUPLEX Or FILE_FLAG_WRITE_THROUGH
pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSAGE Or
PIPE_READMODE_MESSAGE
hPipe = CreateNamedPipe(pipeName, openMode, pipeMode, 10,
10000, 2000, 10000, IntPtr.Zero)
res = ConnectNamedPipe(hPipe, 0)
res = ReadFile(hPipe, dataIn, 256, nChars, 0)
stringIn = System.Text.Encoding.ASCII.GetString(dataIn)
CloseHandle(hPipe)
Client code
========
Dim pipeName As String = "\\.\pipe\MServerPipe"
Dim res, cbRead, numBytes As Integer
Dim stringOut As String
Dim dataOut(256), dataIn(256) As Byte
stringOut = "This is a test"
dataOut = System.Text.Encoding.ASCII.GetBytes(stringOut)
res = CallNamedPipe(pipeName, dataOut, stringOut.Length,
dataIn, numBytes, cbRead, 30000)
API declarations
============
Public Declare Function CallNamedPipe Lib "kernel32" Alias
"CallNamedPipeA" _
(ByVal lpNamedPipeName As String, _
ByRef lpInBuffer() As Byte, _
ByVal nInBufferSize As Integer, _
ByRef lpOutBuffer() As Byte, _
ByVal nOutBufferSize As Integer, _
ByRef lpBytesRead As Integer, ByVal nTimeOut As Integer) As
Integer
Declare Function WriteFile Lib "kernel32" _
(ByVal hFile As Integer, ByRef lpBuffer() As Byte, _
ByVal nNumberOfBytesToWrite As Integer, ByRef
lpNumberOfBytesWritten As Integer, _
ByVal lpOverlapped As Integer _
) As Integer
Declare Function ReadFile Lib "kernel32" _
(ByVal hFile As Integer, ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesToRead As Integer, ByRef
lpNumberOfBytesRead As Integer, _
ByVal lpOverlapped As Integer _
) As Integer
Ok... I looked at their sample, and here is what I have:
' client
Option Strict On
Option Explicit On
Imports System.Text
Module Module1
Sub Main()
Dim outBuffer() As Byte = Encoding.ASCII.GetBytes("Hi, Server!")
Dim inBuffer(BUFFSIZE) As Byte
Dim bytesRead As Integer
'Call the CallNamedPipe function to do the transactions
CallNamedPipe(pipeName, outBuffer, outBuffer.Length, inBuffer, inBuffer.Length, bytesRead, 30000)
Console.WriteLine(Encoding.ASCII.GetString(inBuffe r, 0, bytesRead))
End Sub
Private Const pipeName As String = "\\.\pipe\MyPipe"
Private Const BUFFSIZE As Integer = 10000
Private hpipe As IntPtr
Public ReadOnly INVALID_HANDLE_VALUE As IntPtr = New IntPtr(-1)
Public Declare Auto Function CallNamedPipe Lib "kernel32" ( _
ByVal lpNamedPipeName As String, _
ByVal lpInBuffer() As Byte, _
ByVal nInBufferSize As Integer, _
ByVal lpOutBuffer() As Byte, _
ByVal nOutBufferSize As Integer, _
ByRef lpBytesRead As Integer, _
ByVal nTimeOut As Integer) As Boolean
End Module
' server
Option Strict On
Option Explicit On
Imports System.Text
Module Module1
Private Const pipeName As String = "\\.\pipe\MyPipe"
Private Const BUFFSIZE As Short = 10000
Private hPipe As IntPtr
Sub Main()
Dim openMode As Integer
Dim pipeMode As Integer
'Create the named pipe
openMode = PIPE_ACCESS_DUPLEX Or FILE_FLAG_WRITE_THROUGH
pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSAGE Or PIPE_READMODE_MESSAGE
hPipe = CreateNamedPipe(pipeName, openMode, pipeMode, 10, 10000, 2000, 10000, IntPtr.Zero)
If hPipe <INVALID_HANDLE_VALUE Then
Console.WriteLine("Created the named pipe and waiting for the clients.")
Dim byteCount As Integer
Dim i As Integer
Dim cbnCount As Integer
Dim outBuffer() As Byte = Encoding.ASCII.GetBytes("Hello from the server")
Dim inputBuffer(BUFFSIZE) As Byte
'Wait for a connection, block until a client connects
Console.WriteLine("Waiting for client connections")
Do
ConnectNamedPipe(hPipe, IntPtr.Zero)
''Read the data sent by the client over the pipe
cbnCount = BUFFSIZE
ReadFile(hPipe, inputBuffer, inputBuffer.Length, cbnCount, IntPtr.Zero)
Console.WriteLine("Client Says {0}", Encoding.ASCII.GetString(inputBuffer, 0, cbnCount))
WriteFile(hPipe, outBuffer, outBuffer.Length, cbnCount, IntPtr.Zero)
'res = FlushFileBuffers(hPipe)
''Disconnect the named pipe.
DisconnectNamedPipe(hPipe)
'Loop until the client makes no more requests for data.
Loop Until byteCount = 0
Console.WriteLine("Read or Write completed")
'Close the pipe handle when the client makes no requests
CloseHandle(hPipe)
Console.WriteLine("Disconnected the named pipe")
Else
Console.WriteLine("Pipe creation failed")
End If
End Sub
Public Const FILE_ATTRIBUTE_NORMAL As Short = &H80S
Public Const FILE_FLAG_NO_BUFFERING As Integer = &H20000000
Public Const FILE_FLAG_WRITE_THROUGH As Integer = &H80000000
Public Const PIPE_ACCESS_DUPLEX As Short = &H3S
Public Const PIPE_READMODE_MESSAGE As Short = &H2S
Public Const PIPE_TYPE_MESSAGE As Short = &H4S
Public Const PIPE_WAIT As Short = &H0S
Public ReadOnly INVALID_HANDLE_VALUE As IntPtr = New IntPtr(-1)
Declare Auto Function CreateNamedPipe Lib "kernel32" ( _
ByVal lpName As String, _
ByVal dwOpenMode As Integer, _
ByVal dwPipeMode As Integer, _
ByVal nMaxInstances As Integer, _
ByVal nOutBufferSize As Integer, _
ByVal nInBufferSize As Integer, _
ByVal nDefaultTimeOut As Integer, _
ByVal lpSecurityAttributes As IntPtr _
) As IntPtr
Declare Function ConnectNamedPipe Lib "kernel32" ( _
ByVal hNamedPipe As IntPtr, _
ByVal lpOverlapped As IntPtr _
) As Boolean
Declare Function DisconnectNamedPipe Lib "kernel32" ( _
ByVal hNamedPipe As IntPtr _
) As Boolean
Declare Function WriteFile Lib "kernel32" ( _
ByVal hFile As IntPtr, _
ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesToWrite As Integer, _
ByRef lpNumberOfBytesWritten As Integer, _
ByVal lpOverlapped As IntPtr _
) As Integer
Declare Function ReadFile Lib "kernel32" ( _
ByVal hFile As IntPtr, _
ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesToRead As Integer, _
ByRef lpNumberOfBytesRead As Integer, _
ByVal lpOverlapped As IntPtr _
) As Integer
Declare Function FlushFileBuffers Lib "kernel32" _
(ByVal hFile As IntPtr) As Integer
Declare Function CloseHandle Lib "kernel32" _
(ByVal hObject As IntPtr) As Integer
End Module
They made a lot of strange choices for their declares :) Anyway - hope this
helps.
--
Tom Shelton
