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<section id="reading-and-writing-the-arrow-ipc-format">
<h1>Reading and writing the Arrow IPC format<a class="headerlink" href="#reading-and-writing-the-arrow-ipc-format" title="Permalink to this heading"></a></h1>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><a class="reference internal" href="../format/Columnar.html#format-ipc"><span class="std std-ref">Arrow IPC format specification</span></a>.</p>
<p><a class="reference internal" href="api/ipc.html"><span class="doc">API reference for IPC readers and writers</span></a>.</p>
</div>
<p>Arrow C++ provides readers and writers for the Arrow IPC format which wrap
lower level input/output, handled through the <a class="reference internal" href="io.html"><span class="doc">IO interfaces</span></a>.
For reading, there is also an event-driven API that enables feeding
arbitrary data into the IPC decoding layer asynchronously.</p>
<section id="reading-ipc-streams-and-files">
<h2>Reading IPC streams and files<a class="headerlink" href="#reading-ipc-streams-and-files" title="Permalink to this heading"></a></h2>
<section id="synchronous-reading">
<h3>Synchronous reading<a class="headerlink" href="#synchronous-reading" title="Permalink to this heading"></a></h3>
<p>For most cases, it is most convenient to use the <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc23RecordBatchStreamReaderE" title="arrow::ipc::RecordBatchStreamReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatchStreamReader</span></code></a>
or <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc21RecordBatchFileReaderE" title="arrow::ipc::RecordBatchFileReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatchFileReader</span></code></a> class, depending on which variant of the IPC
format you want to read. The former requires a <a class="reference internal" href="api/io.html#_CPPv4N5arrow2io11InputStreamE" title="arrow::io::InputStream"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">InputStream</span></code></a>
source, while the latter requires a <a class="reference internal" href="api/io.html#_CPPv4N5arrow2io16RandomAccessFileE" title="arrow::io::RandomAccessFile"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RandomAccessFile</span></code></a>.</p>
<p>Reading Arrow IPC data is inherently zero-copy if the source allows it.
For example, a <a class="reference internal" href="api/io.html#_CPPv4N5arrow2io12BufferReaderE" title="arrow::io::BufferReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">BufferReader</span></code></a> or <a class="reference internal" href="api/io.html#_CPPv4N5arrow2io16MemoryMappedFileE" title="arrow::io::MemoryMappedFile"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">MemoryMappedFile</span></code></a>
can typically be zero-copy. Exceptions are when the data must be transformed
on the fly, e.g. when buffer compression has been enabled on the IPC stream
or file.</p>
</section>
<section id="event-driven-reading">
<h3>Event-driven reading<a class="headerlink" href="#event-driven-reading" title="Permalink to this heading"></a></h3>
<p>When it is necessary to process the IPC format without blocking (for example
to integrate Arrow with an event loop), or if data is coming from an unusual
source, use the event-driven <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc13StreamDecoderE" title="arrow::ipc::StreamDecoder"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">StreamDecoder</span></code></a>. You will need to define
a subclass of <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc8ListenerE" title="arrow::ipc::Listener"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">Listener</span></code></a> and implement the virtual methods for the
desired events (for example, implement <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc8Listener20OnRecordBatchDecodedENSt10shared_ptrI11RecordBatchEE" title="arrow::ipc::Listener::OnRecordBatchDecoded"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">Listener::OnRecordBatchDecoded()</span></code></a>
to be notified of each incoming <a class="reference internal" href="api/table.html#_CPPv4N5arrow11RecordBatchE" title="arrow::RecordBatch"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatch</span></code></a>).</p>
</section>
</section>
<section id="writing-ipc-streams-and-files">
<h2>Writing IPC streams and files<a class="headerlink" href="#writing-ipc-streams-and-files" title="Permalink to this heading"></a></h2>
<p>Use one of the factory functions, <a class="reference internal" href="api/ipc.html#_CPPv416MakeStreamWriterPN2io12OutputStreamERKNSt10shared_ptrI6SchemaEERK15IpcWriteOptions" title="MakeStreamWriter"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">MakeStreamWriter()</span></code></a> or
<a class="reference internal" href="api/ipc.html#_CPPv414MakeFileWriterPN2io12OutputStreamERKNSt10shared_ptrI6SchemaEERK15IpcWriteOptionsRKNSt10shared_ptrIK16KeyValueMetadataEE" title="MakeFileWriter"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">MakeFileWriter()</span></code></a>, to obtain a <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc17RecordBatchWriterE" title="arrow::ipc::RecordBatchWriter"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatchWriter</span></code></a> instance for
the given IPC format variant.</p>
</section>
<section id="configuring">
<h2>Configuring<a class="headerlink" href="#configuring" title="Permalink to this heading"></a></h2>
<p>Various aspects of reading and writing the IPC format can be configured
using the <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc14IpcReadOptionsE" title="arrow::ipc::IpcReadOptions"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">IpcReadOptions</span></code></a> and <a class="reference internal" href="api/ipc.html#_CPPv4N5arrow3ipc15IpcWriteOptionsE" title="arrow::ipc::IpcWriteOptions"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">IpcWriteOptions</span></code></a> classes,
respectively.</p>
</section>
</section>
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