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AnonymousPipeServerStream Class

Exposes a stream around an anonymous pipe, which supports both synchronous and asynchronous read and write operations.

System.Object
  System.MarshalByRefObject
    System.IO.Stream
      System.IO.Pipes.PipeStream
        System.IO.Pipes.AnonymousPipeServerStream

Namespace:  System.IO.Pipes
Assembly:  System.Core (in System.Core.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
public sealed class AnonymousPipeServerStream : PipeStream

The AnonymousPipeServerStream type exposes the following members.

  NameDescription
Public methodAnonymousPipeServerStream()Initializes a new instance of the AnonymousPipeServerStream class.
Public methodAnonymousPipeServerStream(PipeDirection)Initializes a new instance of the AnonymousPipeServerStream class with the specified pipe direction.
Public methodAnonymousPipeServerStream(PipeDirection, HandleInheritability)Initializes a new instance of the AnonymousPipeServerStream class with the specified pipe direction and inheritability mode.
Public methodAnonymousPipeServerStream(PipeDirection, SafePipeHandle, SafePipeHandle)Initializes a new instance of the AnonymousPipeServerStream class from the specified pipe handles.
Public methodAnonymousPipeServerStream(PipeDirection, HandleInheritability, Int32)Initializes a new instance of the AnonymousPipeServerStream class with the specified pipe direction, inheritability mode, and buffer size.
Public methodAnonymousPipeServerStream(PipeDirection, HandleInheritability, Int32, PipeSecurity)Initializes a new instance of the AnonymousPipeServerStream class with the specified pipe direction, inheritability mode, buffer size, and pipe security.
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  NameDescription
Public propertyCanReadGets a value indicating whether the current stream supports read operations. (Inherited from PipeStream.)
Public propertyCanSeekGets a value indicating whether the current stream supports seek operations. (Inherited from PipeStream.)
Public propertyCanTimeoutGets a value that determines whether the current stream can time out. (Inherited from Stream.)
Public propertyCanWriteGets a value indicating whether the current stream supports write operations. (Inherited from PipeStream.)
Public propertyClientSafePipeHandleGets the safe handle for the AnonymousPipeClientStream object that is currently connected to the AnonymousPipeServerStream object.
Public propertyInBufferSizeGets the size, in bytes, of the inbound buffer for a pipe. (Inherited from PipeStream.)
Public propertyIsAsyncGets a value indicating whether a PipeStream object was opened asynchronously or synchronously. (Inherited from PipeStream.)
Public propertyIsConnectedGets or sets a value indicating whether a PipeStream object is connected. (Inherited from PipeStream.)
Public propertyIsMessageCompleteGets a value indicating whether there is more data in the message returned from the most recent read operation. (Inherited from PipeStream.)
Public propertyLengthGets the length of a stream, in bytes. (Inherited from PipeStream.)
Public propertyOutBufferSizeGets the size, in bytes, of the outbound buffer for a pipe. (Inherited from PipeStream.)
Public propertyPositionGets or sets the current position of the current stream. (Inherited from PipeStream.)
Public propertyReadModeSets the reading mode for the AnonymousPipeServerStream object. For anonymous pipes, transmission mode must be Byte. (Overrides PipeStream.ReadMode.)
Public propertyReadTimeoutGets or sets a value, in miliseconds, that determines how long the stream will attempt to read before timing out. (Inherited from Stream.)
Public propertySafePipeHandleGets the safe handle for the local end of the pipe that the current PipeStream object encapsulates. (Inherited from PipeStream.)
Public propertyTransmissionModeGets the pipe transmission mode that is supported by the current pipe. (Overrides PipeStream.TransmissionMode.)
Public propertyWriteTimeoutGets or sets a value, in miliseconds, that determines how long the stream will attempt to write before timing out. (Inherited from Stream.)
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  NameDescription
Public methodBeginReadBegins an asynchronous read operation. (Inherited from PipeStream.)
Public methodBeginWriteBegins an asynchronous write operation. (Inherited from PipeStream.)
Protected methodCheckPipePropertyOperationsInfrastructure. Verifies that the pipe is in a proper state for getting or setting properties. (Inherited from PipeStream.)
Protected methodCheckReadOperationsInfrastructure. Verifies that the pipe is in a connected state for read operations. (Inherited from PipeStream.)
Protected methodCheckWriteOperationsInfrastructure. Verifies that the pipe is in a connected state for write operations. (Inherited from PipeStream.)
Public methodCloseCloses the current stream and releases any resources (such as sockets and file handles) associated with the current stream. Instead of calling this method, ensure that the stream is properly disposed. (Inherited from Stream.)
Public methodCopyTo(Stream)Reads the bytes from the current stream and writes them to another stream. (Inherited from Stream.)
Public methodCopyTo(Stream, Int32)Reads the bytes from the current stream and writes them to another stream, using a specified buffer size. (Inherited from Stream.)
Public methodCopyToAsync(Stream)Asynchronously reads the bytes from the current stream and writes them to another stream. (Inherited from Stream.)
Public methodCopyToAsync(Stream, Int32)Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size. (Inherited from Stream.)
Public methodCopyToAsync(Stream, Int32, CancellationToken)Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size and cancellation token. (Inherited from Stream.)
Public methodCreateObjRefCreates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.)
Public methodDispose()Releases all resources used by the Stream. (Inherited from Stream.)
Public methodDisposeLocalCopyOfClientHandleCloses the local copy of the AnonymousPipeClientStream object's handle.
Public methodEndReadEnds a pending asynchronous read request. (Inherited from PipeStream.)
Public methodEndWriteEnds a pending asynchronous write request. (Inherited from PipeStream.)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodFlushClears the buffer for the current stream and causes any buffered data to be written to the underlying device. (Inherited from PipeStream.)
Public methodFlushAsync()Asynchronously clears all buffers for this stream and causes any buffered data to be written to the underlying device. (Inherited from Stream.)
Public methodFlushAsync(CancellationToken)Asynchronously clears all buffers for this stream, causes any buffered data to be written to the underlying device, and monitors cancellation requests. (Inherited from Stream.)
Public methodGetAccessControlGets a PipeSecurity object that encapsulates the access control list (ACL) entries for the pipe described by the current PipeStream object. (Inherited from PipeStream.)
Public methodGetClientHandleAsStringGets the connected AnonymousPipeClientStream object's handle as a string.
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetLifetimeServiceRetrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodInitializeLifetimeServiceObtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodReadReads a block of bytes from a stream and writes the data to a specified buffer. (Inherited from PipeStream.)
Public methodReadAsync(Byte[], Int32, Int32)Asynchronously reads a sequence of bytes from the current stream and advances the position within the stream by the number of bytes read. (Inherited from Stream.)
Public methodReadAsync(Byte[], Int32, Int32, CancellationToken)Asynchronously reads a sequence of bytes from the current stream, advances the position within the stream by the number of bytes read, and monitors cancellation requests. (Inherited from Stream.)
Public methodReadByteReads a byte from a pipe. (Inherited from PipeStream.)
Public methodSeekSets the current position of the current stream to the specified value. (Inherited from PipeStream.)
Public methodSetAccessControlApplies the access control list (ACL) entries specified by a PipeSecurity object to the pipe specified by the current PipeStream object. (Inherited from PipeStream.)
Public methodSetLengthSets the length of the current stream to the specified value. (Inherited from PipeStream.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodWaitForPipeDrainWaits for the other end of the pipe to read all sent bytes. (Inherited from PipeStream.)
Public methodWriteWrites a block of bytes to the current stream using data from a buffer. (Inherited from PipeStream.)
Public methodWriteAsync(Byte[], Int32, Int32)Asynchronously writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written. (Inherited from Stream.)
Public methodWriteAsync(Byte[], Int32, Int32, CancellationToken)Asynchronously writes a sequence of bytes to the current stream, advances the current position within this stream by the number of bytes written, and monitors cancellation requests. (Inherited from Stream.)
Public methodWriteByteWrites a byte to the current stream. (Inherited from PipeStream.)
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Anonymous pipes help provide safe and secure interprocess communication between child and parent processes. The AnonymousPipeServerStream class enables a parent process to send or receive information from a child process.

Anonymous pipes are unnamed, one-way pipes that typically transfer data between parent and child processes. Anonymous pipes are always local; they cannot be used over a network. A PipeDirection value of InOut is not supported because anonymous pipes are defined to be one-way.

Anonymous pipes do not support Message read modes.

The client side of an anonymous pipe must be created from a pipe handle provided by the server side by calling the GetClientHandleAsString method. The string is then passed as a parameter when creating the client process. From the client process, it is then passed to the AnonymousPipeClientStream constructor as the pipeHandleAsString parameter.

The AnonymousPipeServerStream object must dispose the client handle using the DisposeLocalCopyOfClientHandle method in order to be notified when the client exits.

NoteNote

For Windows XP Professional and Windows 2000 Server, a maximum of 10 pipes can simultaneously connect over the network.

NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The following example demonstrates a way to send a string from a parent process to a child process using anonymous pipes. This example creates an AnonymousPipeServerStream object in a parent process with a PipeDirection value of Out. It also creates an AnonymousPipeClientStream object in a child process with a PipeDirection value of In. The parent process then sends a user-supplied string to the child process. The string is displayed to the console.

This example is for the server process, which uses the AnonymousPipeServerStream class. For the entire code example, including the code for both the pipe client and server, see How to: Use Anonymous Pipes for Local Interprocess Communication.

using System;
using System.IO;
using System.IO.Pipes;
using System.Diagnostics;

class PipeServer
{
    static void Main()
    {
        Process pipeClient = new Process();

        pipeClient.StartInfo.FileName = "pipeClient.exe";

        using (AnonymousPipeServerStream pipeServer =
            new AnonymousPipeServerStream(PipeDirection.Out,
            HandleInheritability.Inheritable))
        {
            // Show that anonymous pipes do not support Message mode. 
            try
            {
                Console.WriteLine("[SERVER] Setting ReadMode to \"Message\".");
                pipeServer.ReadMode = PipeTransmissionMode.Message;
            }
            catch (NotSupportedException e)
            {
                Console.WriteLine("[SERVER] Exception:\n    {0}", e.Message);
            }

            Console.WriteLine("[SERVER] Current TransmissionMode: {0}.",
                pipeServer.TransmissionMode);

            // Pass the client process a handle to the server.
            pipeClient.StartInfo.Arguments =
                pipeServer.GetClientHandleAsString();
            pipeClient.StartInfo.UseShellExecute = false;
            pipeClient.Start();

            pipeServer.DisposeLocalCopyOfClientHandle();

            try
            {
                // Read user input and send that to the client process. 
                using (StreamWriter sw = new StreamWriter(pipeServer))
                {
                    sw.AutoFlush = true;
                    // Send a 'sync message' and wait for client to receive it.
                    sw.WriteLine("SYNC");
                    pipeServer.WaitForPipeDrain();
                    // Send the console input to the client process.
                    Console.Write("[SERVER] Enter text: ");
                    sw.WriteLine(Console.ReadLine());
                }
            }
            // Catch the IOException that is raised if the pipe is broken 
            // or disconnected. 
            catch (IOException e)
            {
                Console.WriteLine("[SERVER] Error: {0}", e.Message);
            }
        }

        pipeClient.WaitForExit();
        pipeClient.Close();
        Console.WriteLine("[SERVER] Client quit. Server terminating.");
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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