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Console.SetOut(TextWriter) Metoda

Definicja

Out Ustawia właściwość na obiekt docelowyTextWriter.

public:
 static void SetOut(System::IO::TextWriter ^ newOut);
public static void SetOut (System.IO.TextWriter newOut);
static member SetOut : System.IO.TextWriter -> unit
Public Shared Sub SetOut (newOut As TextWriter)

Parametry

newOut
TextWriter

Moduł zapisywania tekstu, który ma być używany jako nowe standardowe dane wyjściowe.

Wyjątki

newOut to null.

Obiekt wywołujący nie posiada wymaganych uprawnień.

Przykłady

Poniższy przykład ilustruje użycie SetOut metody . Zastępuje cztery następujące po sobie znaki spacji w ciągu zawierającym znak tabulacji. Aby go uruchomić, należy podać dwa argumenty wiersza polecenia. Pierwszy to nazwa istniejącego pliku tekstowego, do którego zostanie przekierowany standardowy strumień danych wejściowych. Drugi to nazwa pliku, do którego zostanie przekierowany standardowy strumień danych wyjściowych. Ten plik nie musi istnieć. Jeśli istnieje, jego zawartość zostanie zastąpiona.

using namespace System;
using namespace System::IO;

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   const int tabSize = 4;
   String^ usageText = "Usage: INSERTTABS inputfile.txt outputfile.txt";
   StreamWriter^ writer = nullptr;
   if ( args->Length < 3 )
   {
      Console::WriteLine( usageText );
      return 1;
   }

   try
   {
      // Attempt to open output file.
      writer = gcnew StreamWriter( args[ 2 ] );
      // Redirect standard output from the console to the output file.
      Console::SetOut( writer );
      // Redirect standard input from the console to the input file.
      Console::SetIn( gcnew StreamReader( args[ 1 ] ) );
   }
   catch ( IOException^ e ) 
   {
      TextWriter^ errorWriter = Console::Error;
      errorWriter->WriteLine( e->Message );
      errorWriter->WriteLine( usageText );
      return 1;
   }

   String^ line;
   while ( (line = Console::ReadLine()) != nullptr )
   {
      String^ newLine = line->Replace( ((String^)"")->PadRight( tabSize, ' ' ), "\t" );
      Console::WriteLine( newLine );
   }

   writer->Close();
   
   // Recover the standard output stream so that a 
   // completion message can be displayed.
   StreamWriter^ standardOutput = gcnew StreamWriter( Console::OpenStandardOutput() );
   standardOutput->AutoFlush = true;
   Console::SetOut( standardOutput );
   Console::WriteLine( "INSERTTABS has completed the processing of {0}.", args[ 1 ] );
   return 0;
}
using System;
using System.IO;

public class InsertTabs
{
    private const int tabSize = 4;
    private const string usageText = "Usage: INSERTTABS inputfile.txt outputfile.txt";
    public static int Main(string[] args)
    {
        if (args.Length < 2)
        {
            Console.WriteLine(usageText);
            return 1;
        }

        try
        {
            // Attempt to open output file.
            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.
                    Console.SetIn(reader);
                    string line;
                    while ((line = Console.ReadLine()) != null)
                    {
                        string newLine = line.Replace(("").PadRight(tabSize, ' '), "\t");
                        Console.WriteLine(newLine);
                    }
                }
            }
        }
        catch(IOException e)
        {
            TextWriter errorWriter = Console.Error;
            errorWriter.WriteLine(e.Message);
            errorWriter.WriteLine(usageText);
            return 1;
        }

        // Recover the standard output stream so that a
        // completion message can be displayed.
        var standardOutput = new StreamWriter(Console.OpenStandardOutput());
        standardOutput.AutoFlush = true;
        Console.SetOut(standardOutput);
        Console.WriteLine($"INSERTTABS has completed the processing of {args[0]}.");
        return 0;
    }
}
open System
open System.IO

let tabSize = 4
let usageText = "Usage: INSERTTABS inputfile.txt outputfile.txt"

[<EntryPoint>]
let main args =
    if args.Length < 2 then
        Console.WriteLine usageText
        1
    else
        try
            // Attempt to open output file.
            use reader = new StreamReader(args[0])
            use writer = new StreamWriter(args[1])
            
            // Redirect standard output from the console to the output file.
            Console.SetOut writer
            
            // Redirect standard input from the console to the input file.
            Console.SetIn reader
            
            let mutable line = Console.ReadLine()
            while line <> null do
                let newLine = line.Replace(("").PadRight(tabSize, ' '), "\t")
                Console.WriteLine newLine
                line <- Console.ReadLine()

            // Recover the standard output stream so that a
            // completion message can be displayed.
            let standardOutput = new StreamWriter(Console.OpenStandardOutput())
            standardOutput.AutoFlush <- true
            Console.SetOut standardOutput
            Console.WriteLine $"INSERTTABS has completed the processing of {args[0]}."
            0

        with :? IOException as e -> 
            let errorWriter = Console.Error
            errorWriter.WriteLine e.Message
            errorWriter.WriteLine usageText
            1
Imports System.IO

Public Module InsertTabs
    Private Const tabSize As Integer = 4
    Private Const usageText As String = "Usage: INSERTTABS inputfile.txt outputfile.txt"
   
    Public Function Main(args As String()) As Integer
        If args.Length < 2 Then
            Console.WriteLine(usageText)
            Return 1
        End If
      
        Try
            ' Attempt to open output file.
            Using writer As New StreamWriter(args(1))
                Using reader As 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.
                    Console.SetIn(reader)
                    Dim line As String = Console.ReadLine()
                    While line IsNot Nothing
                        Dim newLine As String = line.Replace("".PadRight(tabSize, " "c), ControlChars.Tab)
                        Console.WriteLine(newLine)
                        line = Console.ReadLine()
                    End While
                End Using
            End Using
        Catch e As IOException
            Dim errorWriter As TextWriter = Console.Error
            errorWriter.WriteLine(e.Message)
            errorWriter.WriteLine(usageText)
            Return 1
        End Try

        ' Recover the standard output stream so that a 
        ' completion message can be displayed.
        Dim standardOutput As New StreamWriter(Console.OpenStandardOutput())
        standardOutput.AutoFlush = True
        Console.SetOut(standardOutput)
        Console.WriteLine($"INSERTTABS has completed the processing of {args(0)}.")
        Return 0
    End Function 
End Module

Uwagi

Domyślnie Out właściwość jest ustawiona na standardowy strumień wyjściowy.

Element StreamWriter , który hermetyzuje element FileStream , może służyć do wysyłania danych wyjściowych do pliku. Przykład:

Console::WriteLine("Hello World");
FileStream^ fs = gcnew FileStream("Test.txt", FileMode::Create);
// First, save the standard output.
TextWriter^ tmp = Console::Out;
StreamWriter^ sw = gcnew StreamWriter(fs);
Console::SetOut(sw);
Console::WriteLine("Hello file");
Console::SetOut(tmp);
Console::WriteLine("Hello World");
sw->Close();
Console.WriteLine("Hello World");
FileStream fs = new FileStream("Test.txt", FileMode.Create);
// First, save the standard output.
TextWriter tmp = Console.Out;
StreamWriter sw = new StreamWriter(fs);
Console.SetOut(sw);
Console.WriteLine("Hello file");
Console.SetOut(tmp);
Console.WriteLine("Hello World");
sw.Close();
Console.WriteLine "Hello World"
use fs = new FileStream("Test.txt", FileMode.Create)
// First, save the standard output.
let tmp = Console.Out
use sw = new StreamWriter(fs)
Console.SetOut sw
Console.WriteLine "Hello file"
Console.SetOut tmp
Console.WriteLine "Hello World"
Console.WriteLine("Hello World")
Dim fs As New FileStream("Test.txt", FileMode.Create)
' First, save the standard output.
Dim tmp as TextWriter = Console.Out
Dim sw As New StreamWriter(fs)
Console.SetOut(sw)
Console.WriteLine("Hello file")
Console.SetOut(tmp)
Console.WriteLine("Hello World")
sw.Close()

Rzeczywisty obiekt zwrócony przez Out może być zsynchronizowaną otoką wokół dostarczonego składnika zapisywania tekstu.

Dotyczy

Zobacz też