' Define the namespaces used by this sample.
Imports System
Imports System.Text
Imports System.IO
Imports System.Diagnostics
Imports System.Threading
Imports System.ComponentModel
Imports Microsoft.VisualBasic

Namespace ProcessAsyncStreamSamples

   Class ProcessAsyncOutputRedirection
      ' Define static variables shared by class methods.
      Private Shared sortOutput As StringBuilder = Nothing
      Private Shared numOutputLines As Integer = 0

      Public Shared Sub SortInputListText()

         ' Initialize the process and its StartInfo properties.
         ' The sort command is a console application that
         ' reads and sorts text input.
         Dim sortProcess As New Process()
         sortProcess.StartInfo.FileName = "Sort.exe"

         ' Set UseShellExecute to false for redirection.
         sortProcess.StartInfo.UseShellExecute = False

         ' Redirect the standard output of the sort command.  
         ' Read the stream asynchronously using an event handler.
         sortProcess.StartInfo.RedirectStandardOutput = True
         sortOutput = new StringBuilder()

         ' Set our event handler to asynchronously read the sort output.
         AddHandler sortProcess.OutputDataReceived, _
                    AddressOf SortOutputHandler

         ' Redirect standard input as well.  This stream
         ' is used synchronously.
         sortProcess.StartInfo.RedirectStandardInput = True

         ' Start the process.
         sortProcess.Start()

         ' Use a stream writer to synchronously write the sort input.
         Dim sortStreamWriter As StreamWriter = sortProcess.StandardInput

         ' Start the asynchronous read of the sort output stream.
         sortProcess.BeginOutputReadLine()

         ' Prompt the user for input text lines.  Write each 
         ' line to the redirected input stream of the sort command.
         Console.WriteLine("Ready to sort up to 50 lines of text")

         Dim inputText As String
         Dim numInputLines As Integer = 0
         Do
            Console.WriteLine("Enter a text line (or press the Enter key to stop):")

            inputText = Console.ReadLine()
            If Not String.IsNullOrEmpty(inputText) Then
               numInputLines += 1
               sortStreamWriter.WriteLine(inputText)
            End If
         Loop While Not String.IsNullOrEmpty(inputText) AndAlso numInputLines < 50
         Console.WriteLine("<end of input stream>")
         Console.WriteLine()

         ' End the input stream to the sort command.
         sortStreamWriter.Close()

         ' Wait for the sort process to write the sorted text lines.
         sortProcess.WaitForExit()

         If Not String.IsNullOrEmpty(numOutputLines) Then
            ' Write the formatted and sorted output to the console.
            Console.WriteLine(" Sort results = {0} sorted text line(s) ", _
                              numOutputLines)
            Console.WriteLine("----------")
            Console.WriteLine(sortOutput)
         Else
            Console.WriteLine(" No input lines were sorted.")
         End If

         sortProcess.Close()
      End Sub 

      Private Shared Sub SortOutputHandler(sendingProcess As Object, _
         outLine As DataReceivedEventArgs)

         ' Collect the sort command output.
         If Not String.IsNullOrEmpty(outLine.Data) Then
            numOutputLines += 1

            ' Add the text to the collected output.
            sortOutput.Append(Environment.NewLine + "[" _
                         + numOutputLines.ToString() + "] - " _
                         + outLine.Data)
         End If
      End Sub 
   End Class  
End Namespace 

// Define the namespaces used by this sample.
using System;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Threading;
using System.ComponentModel;

namespace ProcessAsyncStreamSamples
{
    class SortOutputRedirection
    {
        // Define static variables shared by class methods.
        private static StringBuilder sortOutput = null;
        private static int numOutputLines = 0;

        public static void SortInputListText()
        {
            // Initialize the process and its StartInfo properties.
            // The sort command is a console application that
            // reads and sorts text input.

            Process sortProcess;
            sortProcess = new Process();
            sortProcess.StartInfo.FileName = "Sort.exe";

            // Set UseShellExecute to false for redirection.
            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();

            // Use a stream writer to synchronously write the sort input.
            StreamWriter sortStreamWriter = sortProcess.StandardInput;

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

            // Prompt the user for input text lines.  Write each 
            // line to the redirected input stream of the sort command.
            Console.WriteLine("Ready to sort up to 50 lines of text");

            String inputText;
            int numInputLines = 0;
            do 
            {
                Console.WriteLine("Enter a text line (or press the Enter key to stop):");

                inputText = Console.ReadLine();
                if (!String.IsNullOrEmpty(inputText))
                {
                    numInputLines ++;
                    sortStreamWriter.WriteLine(inputText);
                }
            }
            while (!String.IsNullOrEmpty(inputText) && (numInputLines < 50));
            Console.WriteLine("<end of input stream>");
            Console.WriteLine();

            // End the input stream to the sort command.
            sortStreamWriter.Close();

            // Wait for the sort process to write the sorted text lines.
            sortProcess.WaitForExit();

            if (numOutputLines > 0)
            {
                // Write the formatted and sorted output to the console.
                Console.WriteLine(" Sort results = {0} sorted text line(s) ", 
                    numOutputLines);
                Console.WriteLine("----------");
                Console.WriteLine(sortOutput);
            }
            else 
            {
                Console.WriteLine(" No input lines were sorted.");
            }

            sortProcess.Close();
        }

        private static void SortOutputHandler(object sendingProcess, 
            DataReceivedEventArgs outLine)
        {
            // Collect the sort command output.
            if (!String.IsNullOrEmpty(outLine.Data))
            {
                numOutputLines++;

                // Add the text to the collected output.
                sortOutput.Append(Environment.NewLine + 
                    "[" + numOutputLines.ToString() + "] - " + outLine.Data);
            }
        }
    }
}

// Define the namespaces used by this sample.
#using <System.dll>

using namespace System;
using namespace System::Text;
using namespace System::IO;
using namespace System::Diagnostics;
using namespace System::Threading;
using namespace System::ComponentModel;

ref class SortOutputRedirection
{
private:
   // Define static variables shared by class methods.
   static StringBuilder^ sortOutput = nullptr;
   static int numOutputLines = 0;

public:
   static void SortInputListText()
   {
      // Initialize the process and its StartInfo properties.
      // The sort command is a console application that
      // reads and sorts text input.

      Process^ sortProcess;
      sortProcess = gcnew Process;
      sortProcess->StartInfo->FileName = "Sort.exe";

      // Set UseShellExecute to false for redirection.
      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 = gcnew StringBuilder;

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

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

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

      // Use a stream writer to synchronously write the sort input.
      StreamWriter^ sortStreamWriter = sortProcess->StandardInput;

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

      // Prompt the user for input text lines.  Write each 
      // line to the redirected input stream of the sort command.
      Console::WriteLine( "Ready to sort up to 50 lines of text" );

      String^ inputText;
      int numInputLines = 0;
      do
      {
         Console::WriteLine( "Enter a text line (or press the Enter key to stop):" );

         inputText = Console::ReadLine();
         if (  !String::IsNullOrEmpty( inputText ) )
         {
            numInputLines++;
            sortStreamWriter->WriteLine( inputText );
         }
      }
      while (  !String::IsNullOrEmpty( inputText ) && (numInputLines < 50) );

      Console::WriteLine( "<end of input stream>" );
      Console::WriteLine();

      // End the input stream to the sort command.
      sortStreamWriter->Close();

      // Wait for the sort process to write the sorted text lines.
      sortProcess->WaitForExit();

      if ( numOutputLines > 0 )
      {

         // Write the formatted and sorted output to the console.
         Console::WriteLine( " Sort results = {0} sorted text line(s) ",
            numOutputLines.ToString() );
         Console::WriteLine( "----------" );
         Console::WriteLine( sortOutput->ToString() );
      }
      else
      {
         Console::WriteLine( " No input lines were sorted." );
      }

      sortProcess->Close();
   }

private:
   static void SortOutputHandler( Object^ /*sendingProcess*/,
      DataReceivedEventArgs^ outLine )
   {
      // Collect the sort command output.
      if (  !String::IsNullOrEmpty( outLine->Data ) )
      {
         numOutputLines++;

         // Add the text to the collected output.
         sortOutput->AppendFormat( "\n[{0}] {1}",
            numOutputLines.ToString(), outLine->Data );
      }
   }
};