How can I redirect process output (console) to richtextbox?

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what is wrong why is that the richtextbox doesnt get the stream of Process output? theres no text display in richtextbox..

 private void button1_Click(object sender, EventArgs e)
    {

        Process sortProcess;
        sortProcess = new Process();
        sortProcess.StartInfo.FileName = "sort.exe";
        sortProcess.StartInfo.Arguments = this.comboBox1.SelectedItem.ToString();
        // Set UseShellExecute to false for redirection.
        sortProcess.StartInfo.CreateNoWindow = true;
        sortProcess.StartInfo.UseShellExecute = false;



        // Redirect the standard output of the sort command.  
        // This stream is read asynchronously using an event handler.
        sortProcess.StartInfo.RedirectStandardOutput = true;
        sortOutput = new StringBuilder("");

        // Set our event handler to asynchronously read the sort output.
        sortProcess.OutputDataReceived += new DataReceivedEventHandler(SortOutputHandler);

        // Redirect standard input as well.  This stream
        // is used synchronously.
        sortProcess.StartInfo.RedirectStandardInput = true;

        // Start the process.
        sortProcess.Start();



        // Start the asynchronous read of the sort output stream.
        sortProcess.BeginOutputReadLine();
        sortProcess.WaitForExit();


        richTextBox1.AppendText(sortOutput.ToString());
    }

    private static void SortOutputHandler(object sendingProcess,
        DataReceivedEventArgs outLine)
    {
            sortOutput.Append(Environment.NewLine +
                "[" + numOutputLines.ToString() + "] - " + outLine.Data);
        }
    }

so when sort.exe launches, it displays text, i want all those text be displayed also in richtextbox in RealTime (i dont want to wait for the process to exit, and then read all output)

how can i do it? any wrong part of my code? thanks

UPDATE @botz

i added this in my code

 private void SortOutputHandler(object sendingProcess,
        DataReceivedEventArgs outLine)
    {

            sortOutput.Append(Environment.NewLine +
                "[" + numOutputLines.ToString() + "] - " + outLine.Data);
            richTextBox1.AppendText(sortOutput.ToString());


    }

but it throws this exception

Cross-thread operation not valid: Control 'richTextBox1' accessed from a thread other than the thread it was created on.

WaitForExit() blocks your UI Thread, so you don't see the new output. Either wait for the process in a separate thread or replace WaitForExit() with something like this:

while (!sortProcess.HasExited) {
     Application.DoEvents(); // This keeps your form responsive by processing events
}

In your SortOutputHandler, you can now directly append output to your textbox. But you should remember to check if you need to invoke it on the UI Thread.

You can check if it's on the UI thread this way in your handler:

    if (richTextBox1.InvokeRequired) { richTextBox1.BeginInvoke(new DataReceivedEventHandler(SortOutputHandler), new[] { sendingProcess, outLine }); }
    else {
        sortOutput.Append(Environment.NewLine + "[" + numOutputLines.ToString() + "] - " + outLine.Data);
        richTextBox1.AppendText(sortOutput.ToString());
    }

redirect process output (console) to textbox - MSDN, then i have a richtextbox control,, now, how can i redirect the stream towards the richtextbox.Text in realtime?? PS: Process p launches a  The Console object has a SetOut method that lets you change the TextWriter object to which it sends output. To redirect the output, you create a TextWriter subclass and then make the Console object send output to it. The following code shows the TextBoxWriter class.

This is working for me:

private void button1_Click(object sender, EventArgs e)
    {
        using (Process sortProcess = new Process())
        {
            sortProcess.StartInfo.FileName = @"F:\echo_hello.bat";
            sortProcess.StartInfo.CreateNoWindow = true;
            sortProcess.StartInfo.UseShellExecute = false;
            sortProcess.StartInfo.RedirectStandardOutput = true;

            // Set event handler
            sortProcess.OutputDataReceived += new DataReceivedEventHandler(SortOutputHandler);

            // Start the process.
            sortProcess.Start();

            // Start the asynchronous read
            sortProcess.BeginOutputReadLine();

            sortProcess.WaitForExit();
        }
    }

    void SortOutputHandler(object sender, DataReceivedEventArgs e)
    {
        Trace.WriteLine(e.Data);
        this.BeginInvoke(new MethodInvoker(() =>
        {
            richTextBox1.AppendText(e.Data ?? string.Empty);
        }));
    }

The example you started with was a console application, which doesn't care much about multithreaded access. For Windows Forms when you update a control this has to be done from the main UI thread, which is why BeginInvoke is needed. If you want to check rapidly if a handler like SortOutputHandler is working properly you can use System.Diagnostics.Trace.Write*, which doesn't need BeginInvoke.

EDIT: echo_hello.bat simply echoes the "hello" string:

@echo off
echo hello

How can I redirect process output (console) to richtextbox?, what is wrong why is that the richtextbox doesnt get the stream of Process output​? theres no text display in richtextbox.. private void button1_Click(object sender,  Function is activated by button click and is part o GUI application which contains textbox. I'm looking for a way to redirect my function output to this textbox. As i see i can redirect it to file and then probably read it to textbox, but is there a way to redirect it directly? I have tried something like

If you are going to update the ui from another thread, you need to make sure you are on the main ui thread. In the method check for InvokeRequired. See InvokeRequired

Redirect Console window output to a TextBox in C#, The Console object has a SetOut method that lets you change the TextWriter object to which it sends output. To redirect the output, you create a  I am able to redirect the output alright by using the process.OutputDataReceived event. I have a queue that I push lines to, and then I use a timer to periodically dump all the queued lines into the RichTextBox. This works perfectly for some third party programs. The problem lies with programs that write to a single line of the console multiple

Complete application and source code available from this external link of codeproject :

http://www.codeproject.com/Articles/335909/Embedding-a-Console-in-a-C-Application

This is tutorial of implementation of https://github.com/dwmkerr/consolecontrol.

Display output of the CMD in real time inside TextBox, redirect output of it in asynchronous way - update the TextBox.Text dynamically when CMD process send new output ( ping google.com -t ) - if the user input is I found solution but it works for c# console app: Code: Select all Then just set the console output to a new instance of this writer, pointing to some textbox or label: Console.SetOut(new ControlWriter(textbox1)); If you want the output to be written to the console as well as to the textbox we can use this class to create a writer that will write to several writers:

As I said in the comment I posted to the question, by definition of what a sort does, it is impossible for there to be any output until all the input has been read. So the sort program is a bad example of getting output in realtime. So the following is for anyone in the future that wants to do something like this for console programs in general. The following uses a BackgroundWorker to get the output asynchronously and put it into a TextBox. A RichTextBox could easily be used instead.

public partial class MainWindow : Window
{
    const string Path = @"C:\Windows\system32\sort.exe";
    BackgroundWorker Processer = new BackgroundWorker();

    public MainWindow()
    {
        InitializeComponent();
        Processer.WorkerReportsProgress = true;
        Processer.WorkerSupportsCancellation = true;
        Processer.ProgressChanged += Processer_ProgressChanged;
        Processer.DoWork += Processer_DoWork;
    }

    private void Processer_DoWork(object sender, DoWorkEventArgs e)
    {
        StreamReader StandardOutput = e.Argument as StreamReader;
        string data = StandardOutput.ReadLine();
        while (data != null)
        {
            Processer.ReportProgress(0, data);
            data = StandardOutput.ReadLine();
        }
    }

    private void Processer_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        string data = e.UserState as string;
        if (data != null)
            DataBox.Text += data + "\r\n";
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        DataBox.Text = string.Empty;
        ProcessStartInfo StartInfo = new ProcessStartInfo(Path);
        StartInfo.RedirectStandardOutput = true;
        StartInfo.RedirectStandardInput = true;
        StartInfo.UseShellExecute = false;
        Process p = null;
        try { p = Process.Start(StartInfo); }
        catch (Exception ex)
        {
            MessageBox.Show($"Error starting {Path}: {ex.Message}");
            return;
        }
        // Get the output
        Processer.RunWorkerAsync(p.StandardOutput);
        // Put the input
        p.StandardInput.WriteLine("John");
        p.StandardInput.WriteLine("Alice");
        p.StandardInput.WriteLine("Zoe");
        p.StandardInput.WriteLine("Bob");
        p.StandardInput.WriteLine("Mary");
        // Tell the program that is the last of the data
        p.StandardInput.Close();
    }
}

For the sort program it is not necessary to call ReportProgress until after all the data has been read but this is a more generalized sample.

How to redirect Process' standart input/output (C#, .net 4.5, async , How to redirect Process' standart input/output (C#, .net 4.5, async code) RedirectStandardOutput = true, StreamPipe pin = new StreamPipe(Console. would implement this in a win forms where the output is piped to a richtextbox and the  I am using VBOXMANAGE to "export" a guest machine. VBOXManage is a Console application that can control the guest machine's behavior from the host. Since the export command is a long process, it re

Showing output of an external process within a richtextbox or listbox , what is wrong why is that the richtextbox doesnt get the stream of Process output​? theres no text display in richtextbox.. private void button1_Click(object sender,  Ah sorry didn't realise you had manual messages in your Create-VM function that you wanted to be sent to the output box too. Replace write-output with the function and it will send the messages directly to the output box, I've also put in two examples for how you can send the output back from New-ProvVM:

[SOLVED] Redirect all Script output into Forms.TextBox, I am using c# and starting a new console application as a process which sets up a I have the code to start the process with redirect standard output set to true,  using (var writer = new StreamWriter(args[1])) { using (var reader = new StreamReader(args[0])) { // Redirect standard output from the console to the output file. Console.SetOut(writer); // Redirect standard input from the console to the input file.

How can I redirect process output (console) to richtextbox?. what is wrong why is that the richtextbox doesnt get the stream of Process output? theres no text  I am using c# and starting a new console application as a process which sets up a server to connect to SAP. This is working fine, however I would like to show the output of the console application inside my C# form that called the process in either a richtext or listbox.

Comments
  • By definition of what a sort does, it is impossible for there to be any output until all the input has been read. So the sort program is a bad example of getting output in realtime.
  • thanks botz,, what is this [ Application.DoEvents(); // This lets your ]
  • oops. edited my post. basically it processes clicks, pending repaints (such as your textbox if text was appended) and other events.
  • i tried your code,, but i get exception, check my edited post thanks
  • The handler is not the problem. The problem is the WaitForExit() call. Replace it: pastebin.com/KBazyE2D
  • it works. It just looks like openvpn doesn't write to the standard output stream. try calling it without Arguments and you'll see.
  • @sorin,, ive pasted that code in my program.. mind if u take a look -> mediafire.com/?v1cpelnvzb7x558 when the process starts, my gui starts to hang,, and no running display is running in richtextbox. thanks
  • @Lufthansa, that's because the process really doesn't exit (maybe will timeout at some point) for some options in the combobox (I tried with the first one). However, if you use the eighth option in the combobox it works as expected.
  • @Lufthansa, given the nature of the process you're calling I think a good measure would be to use WaitForExit() with the timeout option and log the timeout event in the RichTextBox in case it happens.
  • @Lufthansa, there's no change in the code: as I said before, the process called simply doesn't exit for some servers (maybe they're not reachable) and for this case you should call WaitForExit(timeout) where timeout is given in milliseconds.
  • @sorin, tnx but the server connection is not yet finished (it doesnt matter as of now). Im trying to get the openvpn.exe output displayed in rich textbox. Any idea? Tnx....
  • , i dont need the input as the program only displays, and it doesnt accept any input from the user.. how can i transfer the output to richtexbox in real time? thanks
  • Yeah, I think i see what you are asking now.