Console.OpenStandardOutput Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Acquires the standard output stream.
Overloads
| OpenStandardOutput() |
Acquires the standard output stream. |
| OpenStandardOutput(Int32) |
Acquires the standard output stream, which is set to a specified buffer size. |
- Source:
- Console.cs
- Source:
- Console.cs
- Source:
- Console.cs
Acquires the standard output stream.
public:
static System::IO::Stream ^ OpenStandardOutput();C#
public static System.IO.Stream OpenStandardOutput();static member OpenStandardOutput : unit -> System.IO.StreamPublic Shared Function OpenStandardOutput () As StreamReturns
The standard output stream.
Examples
The following example illustrates the use of the OpenStandardOutput method. It replaces four consecutive space characters in a string with a tab character. To run it, you must supply two command-line arguments. The first is the name of an existing text file to redirect the standard input stream to. The second is the name of a file to redirect the standard output stream to. This file need not exist. 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;
}
C#
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
Remarks
This method can be used to reacquire the standard output stream after it has been changed by the SetOut method.
See also
Applies to
.NET 10 og aðrar útgáfur
| Vara | Útgáfur |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 1.3, 1.4, 1.6, 2.0, 2.1 |
- Source:
- Console.cs
- Source:
- Console.cs
- Source:
- Console.cs
Acquires the standard output stream, which is set to a specified buffer size.
public:
static System::IO::Stream ^ OpenStandardOutput(int bufferSize);C#
public static System.IO.Stream OpenStandardOutput(int bufferSize);static member OpenStandardOutput : int -> System.IO.StreamPublic Shared Function OpenStandardOutput (bufferSize As Integer) As StreamParameters
- bufferSize
- Int32
This parameter has no effect, but its value must be greater than or equal to zero.
Returns
The standard output stream.
Exceptions
bufferSize is less than or equal to zero.
Examples
The following example illustrates the use of the OpenStandardOutput method. It replaces four consecutive space characters in a string with a tab character. To run it, you must supply two command line arguments. The first is the name of an existing text file to redirect the standard input stream to. The second is the name of a file to redirect the standard output stream to. This file need not exist. 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;
}
C#
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
Remarks
This method can be used to reacquire the standard output stream after it has been changed by the SetOut method.
See also
Applies to
.NET 10 og aðrar útgáfur
| Vara | Útgáfur |
|---|---|
| .NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
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