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123 lines
2.6 KiB
C++
123 lines
2.6 KiB
C++
//
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// PipeStream.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/PipeStream.h#1 $
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//
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// Library: Foundation
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// Package: Processes
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// Module: PipeStream
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//
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// Definition of the PipeStream class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_PipeStream_INCLUDED
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#define Foundation_PipeStream_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Pipe.h"
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#include "Poco/BufferedStreamBuf.h"
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#include <istream>
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#include <ostream>
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namespace Poco {
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class Foundation_API PipeStreamBuf: public BufferedStreamBuf
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/// This is the streambuf class used for reading from and writing to a Pipe.
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{
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public:
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typedef BufferedStreamBuf::openmode openmode;
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PipeStreamBuf(const Pipe& pipe, openmode mode);
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/// Creates a PipeStreamBuf with the given Pipe.
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~PipeStreamBuf();
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/// Destroys the PipeStreamBuf.
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void close();
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/// Closes the pipe.
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protected:
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int readFromDevice(char* buffer, std::streamsize length);
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int writeToDevice(const char* buffer, std::streamsize length);
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private:
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enum
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{
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STREAM_BUFFER_SIZE = 1024
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};
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Pipe _pipe;
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};
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class Foundation_API PipeIOS: public virtual std::ios
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/// The base class for PipeInputStream and
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/// PipeOutputStream.
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///
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/// This class is needed to ensure the correct initialization
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/// order of the stream buffer and base classes.
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{
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public:
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PipeIOS(const Pipe& pipe, openmode mode);
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/// Creates the PipeIOS with the given Pipe.
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~PipeIOS();
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/// Destroys the PipeIOS.
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///
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/// Flushes the buffer, but does not close the pipe.
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PipeStreamBuf* rdbuf();
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/// Returns a pointer to the internal PipeStreamBuf.
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void close();
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/// Flushes the stream and closes the pipe.
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protected:
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PipeStreamBuf _buf;
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};
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class Foundation_API PipeOutputStream: public PipeIOS, public std::ostream
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/// An output stream for writing to a Pipe.
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{
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public:
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PipeOutputStream(const Pipe& pipe);
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/// Creates the PipeOutputStream with the given Pipe.
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~PipeOutputStream();
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/// Destroys the PipeOutputStream.
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///
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/// Flushes the buffer, but does not close the pipe.
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};
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class Foundation_API PipeInputStream: public PipeIOS, public std::istream
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/// An input stream for reading from a Pipe.
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///
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/// Using formatted input from a PipeInputStream
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/// is not recommended, due to the read-ahead behavior of
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/// istream with formatted reads.
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{
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public:
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PipeInputStream(const Pipe& pipe);
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/// Creates the PipeInputStream with the given Pipe.
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~PipeInputStream();
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/// Destroys the PipeInputStream.
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};
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} // namespace Poco
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#endif // Foundation_PipeStream_INCLUDED
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