C#•2y ago

❔ Capturing process output

https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.process.outputdatareceived?view=net-7.0#examples I am using the following example to try and capture a process output and print it to a textbox at runtime. The process output is captured, but it is only printed after the process has terminated. how do I make sure to print at runtime?

   var path = "C:\\program.exe";
  Process process = new Process();
            process.StartInfo.FileName = path;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardOutput = true;
            process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
            {
                if (!String.IsNullOrEmpty(e.Data))
                {
                    output.Append(e.Data + "\r\n");
                }
            });
            process.Start();
            process.BeginOutputReadLine();
            process.WaitForExit();
            tboxConsole.AppendText(output.ToString());
            process.WaitForExit();
            process.Close();

   var path = "C:\\program.exe";
  Process process = new Process();
            process.StartInfo.FileName = path;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardOutput = true;
            process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
            {
                if (!String.IsNullOrEmpty(e.Data))
                {
                    output.Append(e.Data + "\r\n");
                }
            });
            process.Start();
            process.BeginOutputReadLine();
            process.WaitForExit();
            tboxConsole.AppendText(output.ToString());
            process.WaitForExit();
            process.Close();

Process.OutputDataReceived Event (System.Diagnostics)

Occurs each time an application writes a line to its redirected StandardOutput stream.

2 Replies

Jester•2y ago

process.WaitForExit(); // waiting for process to exit
tboxConsole.AppendText(output.ToString()); // showing the output

process.WaitForExit(); // waiting for process to exit
tboxConsole.AppendText(output.ToString()); // showing the output

its exactly doing what you coded it to do. the following code may work but might have threading issues

process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
{
  if (!String.IsNullOrEmpty(e.Data))
  {
    output.Append(e.Data + "\r\n");
    tboxConsole.Text = output.ToString();
  }
});

process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
{
  if (!String.IsNullOrEmpty(e.Data))
  {
    output.Append(e.Data + "\r\n");
    tboxConsole.Text = output.ToString();
  }
});

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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Programming

❔ Capturing process output