Postupy: Místní meziprocesová komunikace pomocí anonymních kanálů
Anonymní kanály poskytují meziprocesovou komunikaci na místním počítači. Tyto anonymní kanály nabízejí méně funkcí než pojmenované kanály, mají však také menší nákladovou režii. Anonymní kanály lze použít pro usnadnění meziprocesové komunikace na místním počítači. Anonymní kanály nelze použít pro komunikaci v rámci sítě.
Chcete-li implementovat anonymní kanály, použijte třídy AnonymousPipeServerStream a AnonymousPipeClientStream.
Příklad 1
Následující příklad znázorňuje způsob, jakým lze odeslat řetězec z nadřazeného procesu podřízenému procesu pomocí anonymních kanálů. Tento příklad vytvoří AnonymousPipeServerStream objekt v nadřazený proces s PipeDirection hodnotou Out. Nadřazený proces pak vytvoří podřízený proces pomocí popisovače klienta k vytvoření objektu AnonymousPipeClientStream . Podřízený proces má hodnotu PipeDirection nastavenu na In.
Nadřazený proces poté odešle řetězec zadaný uživatelem podřízenému procesu. Řetězec se zobrazí v konzole podřízeného procesu.
Následující příklad znázorňuje proces serveru.
#using <System.dll>
#using <System.Core.dll>
using namespace System;
using namespace System::IO;
using namespace System::IO::Pipes;
using namespace System::Diagnostics;
ref class PipeServer
{
public:
static void Main()
{
Process^ pipeClient = gcnew Process();
pipeClient->StartInfo->FileName = "pipeClient.exe";
AnonymousPipeServerStream^ pipeServer =
gcnew AnonymousPipeServerStream(PipeDirection::Out,
HandleInheritability::Inheritable);
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.
StreamWriter^ sw = gcnew 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());
sw->Close();
}
// Catch the IOException that is raised if the pipe is broken
// or disconnected.
catch (IOException^ e)
{
Console::WriteLine("[SERVER] Error: {0}", e->Message);
}
pipeServer->Close();
pipeClient->WaitForExit();
pipeClient->Close();
Console::WriteLine("[SERVER] Client quit. Server terminating.");
}
};
int main()
{
PipeServer::Main();
}
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))
{
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.");
}
}
Imports System.IO
Imports System.IO.Pipes
Imports System.Diagnostics
Class PipeServer
Shared Sub Main()
Dim pipeClient As New Process()
pipeClient.StartInfo.FileName = "pipeClient.exe"
Using pipeServer As New AnonymousPipeServerStream(PipeDirection.Out, _
HandleInheritability.Inheritable)
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 sw As 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())
End Using
Catch e As IOException
' Catch the IOException that is raised if the pipe is broken
' or disconnected.
Console.WriteLine("[SERVER] Error: {0}", e.Message)
End Try
End Using
pipeClient.WaitForExit()
pipeClient.Close()
Console.WriteLine("[SERVER] Client quit. Server terminating.")
End Sub
End Class
Příklad 2
Následující příklad znázorňuje proces klienta. Proces serveru spustí proces klienta a poskytne tomuto procesu popisovač klienta. Výsledný spustitelný soubor z kódu klienta by měl být pojmenován jako pipeClient.exe
a zkopírován do stejného adresáře jako spustitelný soubor serveru před spuštěním procesu serveru.
#using <System.Core.dll>
using namespace System;
using namespace System::IO;
using namespace System::IO::Pipes;
ref class PipeClient
{
public:
static void Main(array<String^>^ args)
{
if (args->Length > 1)
{
PipeStream^ pipeClient = gcnew AnonymousPipeClientStream(PipeDirection::In, args[1]);
Console::WriteLine("[CLIENT] Current TransmissionMode: {0}.",
pipeClient->TransmissionMode);
StreamReader^ sr = gcnew StreamReader(pipeClient);
// Display the read text to the console
String^ temp;
// Wait for 'sync message' from the server.
do
{
Console::WriteLine("[CLIENT] Wait for sync...");
temp = sr->ReadLine();
}
while (!temp->StartsWith("SYNC"));
// Read the server data and echo to the console.
while ((temp = sr->ReadLine()) != nullptr)
{
Console::WriteLine("[CLIENT] Echo: " + temp);
}
sr->Close();
pipeClient->Close();
}
Console::Write("[CLIENT] Press Enter to continue...");
Console::ReadLine();
}
};
int main()
{
array<String^>^ args = Environment::GetCommandLineArgs();
PipeClient::Main(args);
}
using System;
using System.IO;
using System.IO.Pipes;
class PipeClient
{
static void Main(string[] args)
{
if (args.Length > 0)
{
using (PipeStream pipeClient =
new AnonymousPipeClientStream(PipeDirection.In, args[0]))
{
Console.WriteLine("[CLIENT] Current TransmissionMode: {0}.",
pipeClient.TransmissionMode);
using (StreamReader sr = new StreamReader(pipeClient))
{
// Display the read text to the console
string temp;
// Wait for 'sync message' from the server.
do
{
Console.WriteLine("[CLIENT] Wait for sync...");
temp = sr.ReadLine();
}
while (!temp.StartsWith("SYNC"));
// Read the server data and echo to the console.
while ((temp = sr.ReadLine()) != null)
{
Console.WriteLine("[CLIENT] Echo: " + temp);
}
}
}
}
Console.Write("[CLIENT] Press Enter to continue...");
Console.ReadLine();
}
}
Imports System.IO
Imports System.IO.Pipes
Class PipeClient
Shared Sub Main(args() as String)
If args.Length > 0 Then
Using pipeClient As New AnonymousPipeClientStream(PipeDirection.In, args(0))
Console.WriteLine("[CLIENT] Current TransmissionMode: {0}.", _
pipeClient.TransmissionMode)
Using sr As New StreamReader(pipeClient)
' Display the read text to the console
Dim temp As String
' Wait for 'sync message' from the server.
Do
Console.WriteLine("[CLIENT] Wait for sync...")
temp = sr.ReadLine()
Loop While temp.StartsWith("SYNC") = False
' Read the server data and echo to the console.
temp = sr.ReadLine()
While Not temp = Nothing
Console.WriteLine("[CLIENT] Echo: " + temp)
temp = sr.ReadLine()
End While
End Using
End Using
End If
Console.Write("[CLIENT] Press Enter to continue...")
Console.ReadLine()
End Sub
End Class