How do I redirect the standard I/O of a process?

Question

How do I redirect the standard I/O of a process?

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Answer 1

You need to use the Process class and set its StandardInput and StandardOutput properties to implement this operation. Please check the following code snippet.

 

Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim p As New Process()
        Dim sw As StreamWriter
        Dim sr As StreamReader
        Dim err As StreamReader
        Dim psI As New ProcessStartInfo("cmd")
        psI.UseShellExecute = False
        psI.RedirectStandardInput = True
        psI.RedirectStandardOutput = True
        psI.RedirectStandardError = True
        psI.CreateNoWindow = True
        p.StartInfo = psI
        p.Start()
        sw = p.StandardInput
        sr = p.StandardOutput
        err = p.StandardError
        sw.AutoFlush = True
        If TextBox3.Text <> "" Then
            sw.WriteLine(TextBox3.Text)
        Else
            'execute default command 
            sw.WriteLine("dir \")
        End If
        sw.Close()
        TextBox1.Text = sr.ReadToEnd()
        TextBox1.Text += err.ReadToEnd()
    End Sub
End Class 

 

Read the following links for detailed information. 

http://social.msdn.microsoft.com/forums/en-US/Vsexpressvb/thread/62acea83-236b-4f55-8eec-25d80df5df66/

http://www.c-sharpcorner.com/UploadFile/edwinlima/SystemDiagnosticProcess12052005035444AM/SystemDiagnosticProcess.aspx

 

 

For more FAQ about Visual Basic .NET General, please see Visual Basic .NET General FAQ

 

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Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.

Answer 2

Do tell!

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Doug [Remember to mark replies as helpful (if they are) or as the answer]