Console.SetIn(TextReader) Método

Definição

Define a propriedade In para o objeto TextReader especificado.Sets the In property to the specified TextReader object.

public:
 static void SetIn(System::IO::TextReader ^ newIn);
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static void SetIn (System.IO.TextReader newIn);
public static void SetIn (System.IO.TextReader newIn);
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
static member SetIn : System.IO.TextReader -> unit
static member SetIn : System.IO.TextReader -> unit
Public Shared Sub SetIn (newIn As TextReader)

Parâmetros

newIn
TextReader

Um fluxo que é a nova saída padrão.A stream that is the new standard input.

Atributos

Exceções

newIn é null.newIn is null.

O chamador não tem a permissão necessária.The caller does not have the required permission.

Exemplos

O exemplo a seguir ilustra o uso do método SetIn.The following example illustrates the use of the SetIn method. Ele substitui quatro caracteres de espaços consecutivos em uma cadeia de caracteres por um caractere de tabulação.It replaces four consecutive space characters in a string with a tab character. Para executá-lo, você deve fornecer dois argumentos de linha de comando.To run it, you must supply two command line arguments. O primeiro é o nome de um arquivo de texto existente para o qual redirecionar o fluxo de entrada padrão.The first is the name of an existing text file to redirect the standard input stream to. O segundo é o nome de um arquivo para o qual redirecionar o fluxo de saída padrão.The second is the name of a file to redirect the standard output stream to. Este arquivo não precisa existir.This file need not exist. Se for, o conteúdo será substituído.If it does, its contents will be overwritten.

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;
    }
}
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

Comentários

Por padrão, a In propriedade é definida como o fluxo de entrada padrão.By default, the In property is set to the standard input stream.

Um StreamReader que encapsula um FileStream pode ser usado para receber entrada de um arquivo.A StreamReader that encapsulates a FileStream can be used to receive input from a file.

Aplica-se a

Confira também