I need to execute commandpromt process async and get the output of the execution. i currently have this code
Public Function ExecuteCommandSync(ByVal command As
Below is a class that achieves I believe what you are looking for.
The process is already running async, I believe what you are looking for is event driven and hidden. Do you specifically want a blocking call for some reason, or scared of the threading?
If I am off base and you want it to block, let me know we can do that too, I cannot imagine why though.
It essentially allows you to create a cmd shell and interact with it invisibly.
#Region " Imports "
Imports System.Threading
Imports System.ComponentModel
#End Region
Namespace Common
Public Class CmdShell
#Region " Variables "
Private WithEvents ShellProcess As Process
#End Region
#Region " Events "
''' <summary>
''' Event indicating an asyc read of the command process's StdOut pipe has occured.
''' </summary>
Public Event DataReceived As EventHandler(Of CmdShellDataReceivedEventArgs)
#End Region
#Region " Public Methods "
Public Sub New()
ThreadPool.QueueUserWorkItem(AddressOf ShellLoop, Nothing)
Do Until Not ShellProcess Is Nothing : Loop
End Sub
''' <param name="Value">String value to write to the StdIn pipe of the command process, (CRLF not required).</param>
Public Sub Write(ByVal value As String)
ShellProcess.StandardInput.WriteLine(value)
End Sub
#End Region
#Region " Private Methods "
Private Sub ShellLoop(ByVal state As Object)
Try
Dim SI As New ProcessStartInfo("cmd.exe")
With SI
.Arguments = "/k"
.RedirectStandardInput = True
.RedirectStandardOutput = True
.RedirectStandardError = True
.UseShellExecute = False
.CreateNoWindow = True
.WorkingDirectory = Environ("windir")
End With
Try
ShellProcess = Process.Start(SI)
With ShellProcess
.BeginOutputReadLine()
.BeginErrorReadLine()
.WaitForExit()
End With
Catch ex As Exception
With ex
Trace.WriteLine(.Message)
Trace.WriteLine(.Source)
Trace.WriteLine(.StackTrace)
End With
End Try
Catch ex As Exception
With ex
Trace.WriteLine(.Message)
Trace.WriteLine(.Source)
Trace.WriteLine(.StackTrace)
End With
End Try
End Sub
Private Sub ShellProcess_ErrorDataReceived(ByVal sender As Object, ByVal e As System.Diagnostics.DataReceivedEventArgs) Handles ShellProcess.ErrorDataReceived
If Not e.Data Is Nothing Then RaiseEvent DataReceived(Me, New CmdShellDataReceivedEventArgs(e.Data))
End Sub
Private Sub ShellProcess_OutputDataReceived(ByVal sender As Object, ByVal e As System.Diagnostics.DataReceivedEventArgs) Handles ShellProcess.OutputDataReceived
If Not e.Data Is Nothing Then RaiseEvent DataReceived(Me, New CmdShellDataReceivedEventArgs(e.Data & Environment.NewLine))
End Sub
#End Region
End Class
<EditorBrowsable(EditorBrowsableState.Never)> _
Public Class CmdShellDataReceivedEventArgs : Inherits EventArgs
Private _Value As String
Public Sub New(ByVal value As String)
_Value = value
End Sub
Public ReadOnly Property Value() As String
Get
Return _Value
End Get
End Property
End Class
End Namespace