Solved

Processes: StandardInput/StandardOutput

Posted on 2008-10-13
6
949 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

Open in new window

0
Comment
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
Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

 
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

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article describes relatively difficult and non-obvious issues that are likely to arise when creating COM class in Visual Studio and deploying it by professional MSI-authoring tools. It is assumed that the reader is already familiar with the cla…
More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question