Hi all,
Having some trouble using named pipes and Visual Basic .NET and would
appreciate and help you could offer.
Essentially I am trying to develop a simple client/server application
that exchanges text messages using named pipes. The internet resources
seem a bit scarce and the only Microsoft resource I can find is http://support.microsoft.com/kb/871044.
I have managed to get the above KB example working but I am struggling
to convert it to just use string data between the client & server.
Anyone done this already using Visual Basic .NET?
Cheers. 7  7653 
On Jul 3, 1:39*pm, andrewb <ajba...@deloit te.co.ukwrote:
Hi all,
Having some trouble using named pipes and Visual Basic .NET and would
appreciate and help you could offer.
Essentially I am trying to develop a simple client/server application
that exchanges text messages using named pipes. The internet resources
seem a bit scarce and the only Microsoft resource I can find ishttp://support.microso ft.com/kb/871044.
I have managed to get the above KB example working but I am struggling
to convert it to just use string data between the client & server.
Anyone done this already using Visual Basic .NET?
Cheers.
Hi,
I hope that provides better info for sending strings using pipes: http://msdn.microsoft.com/en-us/libr...verstream.aspx
or: http://msdn.microsoft.com/en-us/libr....io.pipes.aspx
However you can also consider using System.Net.Sock ets.
HTH,
Onur Güzel
On 2008-07-03, andrewb <aj*****@deloit te.co.ukwrote:
Hi all,
Having some trouble using named pipes and Visual Basic .NET and would
appreciate and help you could offer.
Essentially I am trying to develop a simple client/server application
that exchanges text messages using named pipes. The internet resources
seem a bit scarce and the only Microsoft resource I can find is
http://support.microsoft.com/kb/871044.
I have managed to get the above KB example working but I am struggling
to convert it to just use string data between the client & server.
Anyone done this already using Visual Basic .NET?
Cheers.
What version of VB are you using? If your using 2008, then you might want to
take a look at System.IO.Pipes - they are now part of the framework. You can
find documentation and examples here: http://msdn.microsoft.com/en-us/libr....io.pipes.aspx
If you must use the API example... Then the simple answer is to convert your
strings to byte arrays before sending them accross the pipe:
' send data
Dim dataBuffer() As Byte = Encoding.Defaul t.GetBytes(stri ngData)
WriteFile(..... .)
' receive data
ReadFile(...dat aBuffer...)
....
Dim stringData As String = Encoding.Defaul t.GetString(dat aBuffer)
--
Tom Shelton
On 2008-07-03, Tom Shelton <to*********@co mcastXXXXXXX.ne twrote:
On 2008-07-03, andrewb <aj*****@deloit te.co.ukwrote:
>Hi all,
Having some trouble using named pipes and Visual Basic .NET and would
appreciate and help you could offer.
Essentially I am trying to develop a simple client/server application
that exchanges text messages using named pipes. The internet resources
seem a bit scarce and the only Microsoft resource I can find is
http://support.microsoft.com/kb/871044.
I have managed to get the above KB example working but I am struggling
to convert it to just use string data between the client & server.
Anyone done this already using Visual Basic .NET?
Cheers.
What version of VB are you using? If your using 2008, then you might want to
take a look at System.IO.Pipes - they are now part of the framework. You can
find documentation and examples here:
http://msdn.microsoft.com/en-us/libr....io.pipes.aspx
If you must use the API example... Then the simple answer is to convert your
strings to byte arrays before sending them accross the pipe:
' send data
Dim dataBuffer() As Byte = Encoding.Defaul t.GetBytes(stri ngData)
WriteFile(..... .)
' receive data
ReadFile(...dat aBuffer...)
...
Dim stringData As String = Encoding.Defaul t.GetString(dat aBuffer)
I should probably mention... If all of your strings can be represented in
ASCII then, you can actually use Encoding.ASCII on both ends.
--
Tom Shelton
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\MServ erPipe"
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_DUP LEX Or FILE_FLAG_WRITE _THROUGH
pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSA GE Or
PIPE_READMODE_M ESSAGE
hPipe = CreateNamedPipe (pipeName, openMode, pipeMode, 10,
10000, 2000, 10000, IntPtr.Zero)
res = ConnectNamedPip e(hPipe, 0)
res = ReadFile(hPipe, dataIn, 256, nChars, 0)
stringIn = System.Text.Enc oding.ASCII.Get String(dataIn)
CloseHandle(hPi pe)
Client code
========
Dim pipeName As String = "\\.\pipe\MServ erPipe"
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.Enc oding.ASCII.Get Bytes(stringOut )
res = CallNamedPipe(p ipeName, dataOut, stringOut.Lengt h,
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 nNumberOfBytesT oWrite As Integer, ByRef
lpNumberOfBytes Written As Integer, _
ByVal lpOverlapped As Integer _
) As Integer
Declare Function ReadFile Lib "kernel32" _
(ByVal hFile As Integer, ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesT oRead As Integer, ByRef
lpNumberOfBytes Read As Integer, _
ByVal lpOverlapped As Integer _
) As Integer
"andrewb" <aj*****@deloit te.co.ukschrieb :
Dim pipeName As String = "\\.\pipe\MServ erPipe"
Dim res, cbRead, numBytes As Integer
Dim stringOut As String
Dim dataOut(256), dataIn(256) As Byte
Note that these arrays will have 257 elements with indices running from 0 to
256.
Public Declare Function CallNamedPipe Lib "kernel32" Alias
"CallNamedPipeA " _
Is there any reason you are using the Windows ANSI version of the function?
If not, use 'Public Declare Auto Function' and remove the alias.
ByRef lpBytesRead As Integer, ByVal nTimeOut As Integer) As
Integer
='As Boolean'.
Declare Function WriteFile Lib "kernel32" _
(ByVal hFile As Integer
='ByVal hFile As IntPtr'.
, ByRef lpBuffer() As Byte, _
ByVal nNumberOfBytesT oWrite As Integer, ByRef
lpNumberOfBytes Written As Integer, _
ByVal lpOverlapped As Integer _
='As IntPtr'.
) As Integer
='As Boolean'.
The same applies to 'ReadFile'.
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>
On 2008-07-03, andrewb <aj*****@deloit te.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\MServ erPipe"
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_DUP LEX Or FILE_FLAG_WRITE _THROUGH
pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSA GE Or
PIPE_READMODE_M ESSAGE
hPipe = CreateNamedPipe (pipeName, openMode, pipeMode, 10,
10000, 2000, 10000, IntPtr.Zero)
res = ConnectNamedPip e(hPipe, 0)
res = ReadFile(hPipe, dataIn, 256, nChars, 0)
stringIn = System.Text.Enc oding.ASCII.Get String(dataIn)
CloseHandle(hPi pe)
Client code
========
Dim pipeName As String = "\\.\pipe\MServ erPipe"
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.Enc oding.ASCII.Get Bytes(stringOut )
res = CallNamedPipe(p ipeName, dataOut, stringOut.Lengt h,
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 nNumberOfBytesT oWrite As Integer, ByRef
lpNumberOfBytes Written As Integer, _
ByVal lpOverlapped As Integer _
) As Integer
Declare Function ReadFile Lib "kernel32" _
(ByVal hFile As Integer, ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesT oRead As Integer, ByRef
lpNumberOfBytes Read 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(BUFFSI ZE) As Byte
Dim bytesRead As Integer
'Call the CallNamedPipe function to do the transactions
CallNamedPipe(p ipeName, outBuffer, outBuffer.Lengt h, inBuffer, inBuffer.Length , bytesRead, 30000)
Console.WriteLi ne(Encoding.ASC II.GetString(in Buffer, 0, bytesRead))
End Sub
Private Const pipeName As String = "\\.\pipe\MyPip e"
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\MyPip e"
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_DUP LEX Or FILE_FLAG_WRITE _THROUGH
pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSA GE Or PIPE_READMODE_M ESSAGE
hPipe = CreateNamedPipe (pipeName, openMode, pipeMode, 10, 10000, 2000, 10000, IntPtr.Zero)
If hPipe <INVALID_HANDLE _VALUE Then
Console.WriteLi ne("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(BUF FSIZE) As Byte
'Wait for a connection, block until a client connects
Console.WriteLi ne("Waiting for client connections")
Do
ConnectNamedPip e(hPipe, IntPtr.Zero)
''Read the data sent by the client over the pipe
cbnCount = BUFFSIZE
ReadFile(hPipe, inputBuffer, inputBuffer.Len gth, cbnCount, IntPtr.Zero)
Console.WriteLi ne("Client Says {0}", Encoding.ASCII. GetString(input Buffer, 0, cbnCount))
WriteFile(hPipe , outBuffer, outBuffer.Lengt h, cbnCount, IntPtr.Zero)
'res = FlushFileBuffer s(hPipe)
''Disconnect the named pipe.
DisconnectNamed Pipe(hPipe)
'Loop until the client makes no more requests for data.
Loop Until byteCount = 0
Console.WriteLi ne("Read or Write completed")
'Close the pipe handle when the client makes no requests
CloseHandle(hPi pe)
Console.WriteLi ne("Disconnecte d the named pipe")
Else
Console.WriteLi ne("Pipe creation failed")
End If
End Sub
Public Const FILE_ATTRIBUTE_ NORMAL As Short = &H80S
Public Const FILE_FLAG_NO_BU FFERING As Integer = &H20000000
Public Const FILE_FLAG_WRITE _THROUGH As Integer = &H80000000
Public Const PIPE_ACCESS_DUP LEX As Short = &H3S
Public Const PIPE_READMODE_M ESSAGE As Short = &H2S
Public Const PIPE_TYPE_MESSA GE 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 lpSecurityAttri butes As IntPtr _
) As IntPtr
Declare Function ConnectNamedPip e Lib "kernel32" ( _
ByVal hNamedPipe As IntPtr, _
ByVal lpOverlapped As IntPtr _
) As Boolean
Declare Function DisconnectNamed Pipe Lib "kernel32" ( _
ByVal hNamedPipe As IntPtr _
) As Boolean
Declare Function WriteFile Lib "kernel32" ( _
ByVal hFile As IntPtr, _
ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesT oWrite As Integer, _
ByRef lpNumberOfBytes Written As Integer, _
ByVal lpOverlapped As IntPtr _
) As Integer
Declare Function ReadFile Lib "kernel32" ( _
ByVal hFile As IntPtr, _
ByVal lpBuffer() As Byte, _
ByVal nNumberOfBytesT oRead As Integer, _
ByRef lpNumberOfBytes Read As Integer, _
ByVal lpOverlapped As IntPtr _
) As Integer
Declare Function FlushFileBuffer s 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
On 4 Jul, 00:14, Tom Shelton <tom_shel...@co mcastXXXXXXX.ne twrote:
On 2008-07-03, andrewb <ajba...@deloit te.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\MServ erPipe"
* * * * 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_DUP LEX Or FILE_FLAG_WRITE _THROUGH
* * * * pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSA GE Or
PIPE_READMODE_M ESSAGE
* * * * hPipe = CreateNamedPipe (pipeName, openMode, pipeMode,10,
10000, 2000, 10000, IntPtr.Zero)
* * * * res = ConnectNamedPip e(hPipe, 0)
* * * * res = ReadFile(hPipe, dataIn, 256, nChars, 0)
* * * * stringIn = System.Text.Enc oding.ASCII.Get String(dataIn)
* * * * CloseHandle(hPi pe)
Client code
========
* * * * Dim pipeName As String = "\\.\pipe\MServ erPipe"
* * * * 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.Enc oding.ASCII.Get Bytes(stringOut )
* * * * res = CallNamedPipe(p ipeName, dataOut, stringOut.Lengt h,
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 nNumberOfBytesT oWrite As Integer, ByRef
lpNumberOfBytes Written As Integer, _
* * ByVal lpOverlapped As Integer _
* * ) As Integer
* * Declare Function ReadFile Lib "kernel32" _
* * * * (ByVal hFile As Integer, ByVal lpBuffer() As Byte, _
* * * * * * ByVal nNumberOfBytesT oRead As Integer, ByRef
lpNumberOfBytes Read 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(BUFFSI ZE) As Byte
* * * * Dim bytesRead As Integer
* * * * 'Call the CallNamedPipe function to do the transactions
* * * * CallNamedPipe(p ipeName, outBuffer, outBuffer.Lengt h, inBuffer, inBuffer.Length , bytesRead, 30000)
* * * * Console.WriteLi ne(Encoding.ASC II.GetString(in Buffer, 0, bytesRead))
* * End Sub
* * Private Const pipeName As String = "\\.\pipe\MyPip e"
* * 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\MyPip e"
* * 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_DUP LEX Or FILE_FLAG_WRITE _THROUGH
* * * * pipeMode = PIPE_WAIT Or PIPE_TYPE_MESSA GE Or PIPE_READMODE_M ESSAGE
* * * * hPipe = CreateNamedPipe (pipeName, openMode, pipeMode, 10, 10000, 2000, 10000, IntPtr.Zero)
* * * * If hPipe <INVALID_HANDLE _VALUE Then
* * * * * * Console.WriteLi ne("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(BUF FSIZE) As Byte
* * * * * * 'Wait for a connection, block until a client connects
* * * * * * Console.WriteLi ne("Waiting for client connections")
* * * * * * Do
* * * * * * * * ConnectNamedPip e(hPipe, IntPtr.Zero)
* * * * * * * * ''Read the data sent by the client over the pipe
* * * * * * * * cbnCount = BUFFSIZE
* * * * * * * * ReadFile(hPipe, inputBuffer, inputBuffer.Len gth, cbnCount, IntPtr.Zero)
* * * * * * * * Console.WriteLi ne("Client Says {0}", Encoding.ASCII. GetString(input Buffer, 0, cbnCount))
* * * * * * * * WriteFile(hPipe , outBuffer, outBuffer.Lengt h, cbnCount, IntPtr.Zero)
* * * * * * * * 'res = FlushFileBuffer s(hPipe)
* * * * * * * * ''Disconnect the named pipe.
* * * * * * * * DisconnectNamed Pipe(hPipe)
* * * * * * * * 'Loop until the client makes no more requests for data.
* * * * * * Loop Until byteCount = 0
* * * * * * Console.WriteLi ne("Read or Write completed")
* * * * * * 'Close the pipe handle when the client makes no requests
* * * * * * CloseHandle(hPi pe)
* * * * * * Console.WriteLi ne("Disconnecte d the named pipe")
* * * * Else
* * * * * * Console.WriteLi ne("Pipe creation failed")
* * * * End If
* * End Sub
* * Public Const FILE_ATTRIBUTE_ NORMAL As Short = &H80S
* * Public Const FILE_FLAG_NO_BU FFERING As Integer = &H20000000
* * Public Const FILE_FLAG_WRITE _THROUGH As Integer = &H80000000
* * Public Const PIPE_ACCESS_DUP LEX As Short = &H3S
* * Public Const PIPE_READMODE_M ESSAGE As Short = &H2S
* * Public Const PIPE_TYPE_MESSA GE 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 lpSecurityAttri butes As IntPtr _
* * ) As IntPtr
* * Declare Function ConnectNamedPip e Lib "kernel32" ( _
* * * * ByVal hNamedPipe As IntPtr, _
* * * * ByVal lpOverlapped As IntPtr _
* * ) As Boolean
* * Declare Function DisconnectNamed Pipe Lib "kernel32" ( _
* * * * ByVal hNamedPipe As IntPtr _
* * ) As Boolean
* * Declare Function WriteFile Lib "kernel32" ( _
* * * * ByVal hFile As IntPtr, _
* * * * ByVal lpBuffer() As Byte, _
* * * * ByVal nNumberOfBytesT oWrite As Integer, _
* * * * ByRef lpNumberOfBytes Written As Integer, _
* * * * ByVal lpOverlapped As IntPtr _
* * ) As Integer
* * Declare Function ReadFile Lib "kernel32" ( _
* * * * ByVal hFile As IntPtr, _
* * * * ByVal lpBuffer() As Byte, _
* * * * ByVal nNumberOfBytesT oRead As Integer, _
* * * * ByRef lpNumberOfBytes Read As Integer, _
* * * * ByVal lpOverlapped As IntPtr _
* * ) As Integer
* * Declare Function FlushFileBuffer s 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- Hide quoted text -
- Show quoted text -
Awesome - job done - thanks Tom This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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passes them to the already running instance. I have been told by
someone that using named pipes is one of the most commonly used ways
of doing this. But I did it in a simpler way; I saved the command-line
arguments in a text file and passed a message to the previously
running instance to read the...
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by: dgk |
last post by:
I trying to use a named pipe but can't figure out how to get the
callback to work:
Module Module1
Private ps As System.IO.Pipes.NamedPipeServerStream
Public Sub main()
Application.EnableVisualStyles()
Try
ps = New System.IO.Pipes.NamedPipeServerStream("Test")
ps.BeginWaitForConnection(AddressOf HandleConnection, "Test")
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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