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Processes: StandardInput/StandardOutput

Posted on 2008-10-13
6
950 Views
Last Modified: 2013-11-07
Hi guys!

I really need some help to sort this out!
The code I have dosent work so I need help to see what I have done wrong, EXPERT help needed!!!

I have 2 applications: App1 and App2
1: In App1 I send a command to App2
2: In App1 I like to know if this command was executed as it should, so I need some data back from App2

This is the code!

---------------------------------------------------------------------------------------------------------------------------
This is just pseudocode  
I  must use the process StandardInput/StandardOutput method, nothing else..
---------------------------------------------------------------------------------------------------------------------------

Thx
In App1
--------------------------------------------------
        Dim myprocess As New Process
        Dim processData As String
 
        With myprocess.StartInfo
            .FileName = applicationPath & server & ".exe"
            .Arguments() = "/input=True,True"
            .CreateNoWindow = False
            .ErrorDialog = False
            .UseShellExecute = False
            .RedirectStandardOutput = True
            .RedirectStandardError = True
            .RedirectStandardInput = True
            .WindowStyle = ProcessWindowStyle.Normal
        End With
 
        myprocess.Start()
 
        Dim standardOutput As IO.StreamReader = myProcess.StandardOutput
 
        '// Wait for Exited event, but not more than 10 seconds.
        Const SLEEP_AMOUNT As Integer = 100
        Do While Not m_shutDownProcessExited
            m_shutDownElapsedTime += SLEEP_AMOUNT
            '// Read the standard output of the spawned process.
            processData = standardOutput.ReadToEnd
            If Not String.IsNullOrEmpty(processData) Then
                Exit Do
            End If
            '// Timout?
            If m_shutDownElapsedTime > 10000 Then
                myProcess.Kill()
                Exit Do
            End If
            Thread.Sleep(SLEEP_AMOUNT)
        Loop
 
        If processData = "True" Then
            'Do some stuff
        Else
            ' Do some other stuff
        End If
 
In App2
--------------------------------------------------
        Dim runningProcesses As Process()
        Dim runningProcess As Process = Nothing
 
        runningProcesses = Process.GetProcessesByName(server.FullPath)
 
        If runningProcesses.Length > 0 Then
            For Each p As Process In runningProcesses
                If p.ProcessName = server.Name Then
                    runningProcess = p
                    Exit For
                End If
            Next
        End If
 
        If runningProcess IsNot Nothing Then
            runningProcess.StandardInput.Write("True")
        End If

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Question by:AWestEng
  • 5
6 Comments
 
LVL 11

Accepted Solution

by:
AkisC earned 500 total points
ID: 22709173
try if this works

replace line 22 - 37 with
'// Wait for Exited event, but not more than 10 seconds.
myprocess.WaitForExit(100000)
processData = myprocess.ExitCode

'// wait a liitle more before killing the process
Threading.Thread.Sleep(1000)
myProcess.Kill()

-ALSO-
you wrote <<I  must use the process StandardInput/StandardOutput method, nothing else..>>
If that is a limitation ok, if not why not have your App2 write a text file e.g. "App2Results.txt" and look for this text file in a do/loop node from App1?


0
 
LVL 1

Author Comment

by:AWestEng
ID: 22709717
question
when using StandardInput/StandardOutput is it not possible to send stuff between the applicaitons when a instance is running, why doesen't my code work?
0
 
LVL 1

Author Comment

by:AWestEng
ID: 22709729
and in App2 should I write to input to send the data back to App1?
0
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LVL 1

Author Comment

by:AWestEng
ID: 22709927
hmm I'll skipt the part of using the standardInput/output I'll connect via a socket instead, any tips there?
only local connection 127.0.0.1 wil be used
0
 
LVL 1

Author Comment

by:AWestEng
ID: 22710363
when I tested some more now I got this error from app 2 > StandardIn has not been redirected
0
 
LVL 1

Author Closing Comment

by:AWestEng
ID: 31506643
I can't get it to work as I want, but that can be my bad.. But thx for trying
0

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