Callback on Named Pipe question

[dgk]

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 .NamedPipeServe rStream
Public Sub main()
Application.Ena bleVisualStyles ()
Try
ps = New System.IO.Pipes .NamedPipeServe rStream("Test")
ps.BeginWaitFor Connection(Addr essOf HandleConnectio n, "Test")
Catch ex As Exception
' pipe already exists
End Try
Application.Run (Form1)
End Sub
Public Sub HandleConnectio n(ByVal ar As System.IAsyncRe sult)
ps.EndWaitForCo nnection(ar)
Using sr As New System.IO.Strea mReader(ps)
Dim message As String = ""
Do
message = sr.ReadLine
Console.WriteLi ne(message)
Loop While message IsNot Nothing
End Using
End Sub
End Module
I don't understand what the second parameter (object) is doing on the
BeginWaitForCon nection. Maybe because of that, and maybe not,
HandleConnectio n doesn't ever fire, even when another program does
open the pipe Test. Nor do I understand why I need to call
EndWaitForConne ction (maybe I don't need to?), or what to do with the
IAsyncResut.

Any info greatly appreciated.

[dgk]

On Thu, 27 Dec 2007 10:41:34 -0500, dgk <dg*@somewhere. comwrote:

>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 .NamedPipeServe rStream
Public Sub main()
Application.Ena bleVisualStyles ()
Try
ps = New System.IO.Pipes .NamedPipeServe rStream("Test")
ps.BeginWaitFor Connection(Addr essOf HandleConnectio n, "Test")
Catch ex As Exception
' pipe already exists
End Try
Application.Run (Form1)
End Sub
Public Sub HandleConnectio n(ByVal ar As System.IAsyncRe sult)
ps.EndWaitForCo nnection(ar)
Using sr As New System.IO.Strea mReader(ps)
Dim message As String = ""
Do
message = sr.ReadLine
Console.WriteLi ne(message)
Loop While message IsNot Nothing
End Using
End Sub
End Module
I don't understand what the second parameter (object) is doing on the
BeginWaitForCo nnection. Maybe because of that, and maybe not,
HandleConnecti on doesn't ever fire, even when another program does
open the pipe Test. Nor do I understand why I need to call
EndWaitForConn ection (maybe I don't need to?), or what to do with the
IAsyncResut.

Any info greatly appreciated.

Ok, I get to answer my own question. If you want to use async methods
with named pipes, you need to open the pipe as async:

ps = New System.IO.Pipes .NamedPipeServe rStream("Test",
IO.Pipes.PipeDi rection.InOut, 3,
IO.Pipes.PipeTr ansmissionMode. Message,
IO.Pipes.PipeOp tions.Asynchron ous)