ProcessStartRedirectOutput

'/----------------------  Form designer ---------------------/'
'/-------------------  Visual Studio 15.7.4  ----------------/'

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.lbl_status = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        '
        'RichTextBox1
        '
        Me.RichTextBox1.BackColor = System.Drawing.Color.FromArgb(CType(CType(64, Byte), Integer), CType(CType(64, Byte), Integer), CType(CType(64, Byte), Integer))
        Me.RichTextBox1.ForeColor = System.Drawing.Color.White
        Me.RichTextBox1.Location = New System.Drawing.Point(12, 76)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(457, 153)
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = ""
        '
        'Button1
        '
        Me.Button1.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb(CType(CType(128, Byte), Integer), CType(CType(64, Byte), Integer), CType(CType(0, Byte), Integer))
        Me.Button1.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb(CType(CType(192, Byte), Integer), CType(CType(64, Byte), Integer), CType(CType(0, Byte), Integer))
        Me.Button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat
        Me.Button1.Font = New System.Drawing.Font("Segoe UI", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Button1.ForeColor = System.Drawing.Color.White
        Me.Button1.Location = New System.Drawing.Point(12, 24)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(88, 35)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Start"
        Me.Button1.UseVisualStyleBackColor = True
        '
        'lbl_status
        '
        Me.lbl_status.Font = New System.Drawing.Font("Segoe UI", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.lbl_status.ForeColor = System.Drawing.Color.White
        Me.lbl_status.Location = New System.Drawing.Point(244, 25)
        Me.lbl_status.Name = "lbl_status"
        Me.lbl_status.Size = New System.Drawing.Size(225, 32)
        Me.lbl_status.TabIndex = 2
        Me.lbl_status.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(96.0!, 96.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi
        Me.BackColor = System.Drawing.Color.FromArgb(CType(CType(32, Byte), Integer), CType(CType(32, Byte), Integer), CType(CType(32, Byte), Integer))
        Me.ClientSize = New System.Drawing.Size(481, 244)
        Me.Controls.Add(Me.lbl_status)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.RichTextBox1)
        Me.ForeColor = System.Drawing.Color.Black
        Me.Name = "Form1"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

    Friend WithEvents RichTextBox1 As RichTextBox
    Friend WithEvents Button1 As Button
    Friend WithEvents lbl_status As Label
End Class

'/-----------------------------  Code ----------------------------------/'

Imports System.Diagnostics
Imports System.IO

'This code uses the Process.SynchronizingObject property, thus the it doesn't really need
'MethodInvoker. It's added anyway (in the Event Handler) to see how it could work.
'It doesn't modify the Process.OutputDataReceived results in any way.
'Delete .SynchronizingObject = Me from the Process contructor to activate it

Public Class Form1

    Private myappthing_proc As Process
    Private myappthing_proc_state As Boolean
    Private ProcessExitCode As Integer = -1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        StartProcess()
    End Sub

    Private Sub StartProcess()

        lbl_status.Text = "Status: Running"

        Dim MyStartInfo As New ProcessStartInfo()
        MyStartInfo.FileName = "tracert.exe"
        MyStartInfo.Arguments = "www.microsoft.com"
        MyStartInfo.WorkingDirectory = Path.Combine(Application.StartupPath, "backend")
        MyStartInfo.RedirectStandardError = True
        MyStartInfo.RedirectStandardOutput = True
        MyStartInfo.UseShellExecute = False
        MyStartInfo.CreateNoWindow = True
        MyStartInfo.WindowStyle = ProcessWindowStyle.Hidden
        myappthing_proc = New Process() With {
            .EnableRaisingEvents = True,
            .StartInfo = MyStartInfo,
            .SynchronizingObject = Me
        }

        myappthing_proc_state = True
        myappthing_proc.Start()
        myappthing_proc.BeginErrorReadLine()
        myappthing_proc.BeginOutputReadLine()

        AddHandler myappthing_proc.OutputDataReceived,
            Sub(sender As Object, e As DataReceivedEventArgs)
                If e.Data IsNot Nothing Then
                    Dim output As String = e.Data.Replace("[0m", "")
                    If InvokeRequired Then
                        Dim mi As MethodInvoker =
                            Sub()
                                RichTextBox1.AppendText(output + Environment.NewLine)
                                RichTextBox1.ScrollToCaret()
                            End Sub
                        Invoke(mi)
                    Else
                        RichTextBox1.AppendText(output + Environment.NewLine)
                        RichTextBox1.ScrollToCaret()
                    End If
                End If
            End Sub

        AddHandler myappthing_proc.ErrorDataReceived,
            Sub(sender As Object, e As DataReceivedEventArgs)
                If e.Data IsNot Nothing Then
                    Dim output As String = e.Data.Replace("[0m", "")
                    If InvokeRequired Then
                        Dim mi As MethodInvoker =
                            Sub()
                                RichTextBox1.AppendText(output  + Environment.NewLine)
                                RichTextBox1.ScrollToCaret()
                            End Sub
                        Invoke(mi)
                    Else
                         RichTextBox1.AppendText(output + Environment.NewLine)
                        RichTextBox1.ScrollToCaret()
                    End If
                End If
            End Sub

        AddHandler myappthing_proc.Exited,
            Sub(source As Object, ev As EventArgs)
                ProcessExitCode = myappthing_proc.ExitCode
                myappthing_proc.Close()
                If Not (IsNothing(myappthing_proc)) Then
                    myappthing_proc.Dispose()
                End If
                lbl_status.Text = "Status: Exited"
                myappthing_proc_state = False
            End Sub
    End Sub
End Class