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140 lines
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<title>Provide a destination for the serialized syntax</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2">
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<link rel="start" href="index.html" title="Raptor RDF Syntax Parsing and Serializing Library Manual">
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<link rel="up" href="tutorial-serializing.html" title="Serializing RDF triples to a syntax">
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<link rel="prev" href="tutorial-serializer-set-error-warning-handlers.html" title="Set error and warning handlers">
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<link rel="chapter" href="introduction.html" title="Raptor Overview">
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<link rel="part" href="tutorial.html" title="Part I. Raptor Tutorial">
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<link rel="chapter" href="tutorial-initialising-finishing.html" title="Initialising and Finishing using the Library">
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<link rel="chapter" href="tutorial-querying-functionality.html" title="Listing built-in functionality">
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<link rel="chapter" href="tutorial-parsing.html" title="Parsing syntaxes to RDF Triples">
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<link rel="chapter" href="tutorial-serializing.html" title="Serializing RDF triples to a syntax">
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<link rel="part" href="reference-manual.html" title="Part II. Raptor Reference Manual">
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<link rel="chapter" href="raptor-parsers.html" title="Parsers in Raptor (syntax to triples)">
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<link rel="chapter" href="raptor-serializers.html" title="Serializers in Raptor (triples to syntax)">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle">
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<td><a accesskey="p" href="tutorial-serializer-set-error-warning-handlers.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
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<th width="100%" align="center">Raptor RDF Syntax Parsing and Serializing Library Manual</th>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="tutorial-serializer-to-destination"></a>Provide a destination for the serialized syntax</h2></div></div></div>
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<p>The operation of turning RDF triples into a syntax has several
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alternatives from functions that do most of the work writing to a file
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or string to functions that allow passing in a
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<a class="link" href="raptor-section-iostream.html#raptor-iostream" title="raptor_iostream"><span class="type">raptor_iostream</span></a>
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which can be entirely user-constructed.</p>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="serialize-to-filename"></a>Serialize to a filename (<a class="link" href="raptor-section-serializer.html#raptor-serialize-start-to-filename" title="raptor_serialize_start_to_filename ()"><code class="function">raptor_serialize_start_to_filename()</code></a>)</h3></div></div></div>
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<p>Serialize to a new filename
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(using <a class="link" href="raptor-section-iostream.html#raptor-new-iostream-to-filename" title="raptor_new_iostream_to_filename ()"><code class="function">raptor_new_iostream_to_filename()</code></a> internally)
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and uses asf base URI, the file's URI.
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</p>
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<pre class="programlisting">
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const char *filename="raptor.rdf";
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raptor_serialize_start_to_filename(rdf_serializer, filename);
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</pre>
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<p>
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</p>
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="serialize-to-string"></a>Serialize to a string (<a class="link" href="raptor-section-serializer.html#raptor-serialize-start-to-string" title="raptor_serialize_start_to_string ()"><code class="function">raptor_serialize_start_to_string()</code></a>)</h3></div></div></div>
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<p>Serialize to a string that is allocated by the serializer
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(using <a class="link" href="raptor-section-iostream.html#raptor-new-iostream-to-string" title="raptor_new_iostream_to_string ()"><code class="function">raptor_new_iostream_to_string()</code></a> internally). The
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resulting string is only constructed after <a class="link" href="raptor-section-serializer.html#raptor-serialize-end" title="raptor_serialize_end ()"><code class="function">raptor_serialize_end()</code></a> is called and at that
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point it is assigned to the string pointer passed in, with the length
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written to the optional length pointer. This function
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takes an optional base URI but may be required by some serializers.
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</p>
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<pre class="programlisting">
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raptor_uri* uri=raptor_new_uri("http://example.org/base");
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void *string; /* destination for string */
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size_t length; /* length of constructed string */
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raptor_serialize_start_to_string(rdf_serializer, uri,
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&string, &length);
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</pre>
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<p>
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</p>
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="serialize-to-filehandle"></a>Serialize to a FILE* file handle (<a class="link" href="raptor-section-serializer.html#raptor-serialize-start-to-file-handle" title="raptor_serialize_start_to_file_handle ()"><code class="function">raptor_serialize_start_to_file_handle()</code></a>)</h3></div></div></div>
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<p>Serialize to an existing open C FILE* file handle
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(using <a class="link" href="raptor-section-iostream.html#raptor-new-iostream-to-file-handle" title="raptor_new_iostream_to_file_handle ()"><code class="function">raptor_new_iostream_to_file_handle()</code></a> internally). The handle is not closed after serializing is finished. This function
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takes an optional base URI but may be required by some serializers.
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</p>
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<pre class="programlisting">
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raptor_uri* uri=raptor_new_uri("http://example.org/base");
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FILE* fh=fopen("raptor.rdf", "wb");
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raptor_serialize_start_to_file_handle(rdf_serializer, uri, fh);
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</pre>
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<p>
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</p>
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="serialize-to-iostream"></a>Serialize to an <a class="link" href="raptor-section-iostream.html#raptor-iostream" title="raptor_iostream"><span class="type">raptor_iostream</span></a> (<a class="link" href="raptor-section-serializer.html#raptor-serialize-start-to-iostream" title="raptor_serialize_start_to_iostream ()"><code class="function">raptor_serialize_start_to_iostream()</code></a>)</h3></div></div></div>
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<p>This is the most flexible serializing method as it allows
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writing to any
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<a class="link" href="raptor-section-iostream.html#raptor-iostream" title="raptor_iostream"><span class="type">raptor_iostream</span></a>
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which can be constructed to build any form of user-generated structure
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via callbacks. The iostream remains owned by the caller that can continue
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to write to it after the serializing is finished (after
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<a class="link" href="raptor-section-serializer.html#raptor-serialize-end" title="raptor_serialize_end ()"><code class="function">raptor_serialize_end()</code></a>) is called).
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</p>
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<pre class="programlisting">
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raptor_uri* uri=raptor_new_uri("http://example.org/base");
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raptor_iostream* iostream = /* iostream initialized by some means */ ;
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raptor_serialize_start_to_iostream(rdf_serializer, uri, iostream);
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while( /* got RDF triples */ ) {
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raptor_statement* triple = /* ... triple made from somewhere ... */ ;
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raptor_serialize_statement(rdf_serializer, triple);
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}
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raptor_serialize_end(rdf_serializer);
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raptor_free_serializer(rdf_serializer);
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/* ... write other stuff to iostream ... */
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raptor_free_iostream(iostream);
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</pre>
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<p>
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</p>
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="serialize-to-iostream-old"></a>Serialize to an <a class="link" href="raptor-section-iostream.html#raptor-iostream" title="raptor_iostream"><span class="type">raptor_iostream</span></a> and close iostream (<a class="link" href="raptor-section-serializer.html#raptor-serialize-start" title="raptor_serialize_start ()"><code class="function">raptor_serialize_start()</code></a>)</h3></div></div></div>
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<p><a class="link" href="raptor-section-serializer.html#raptor-serialize-start" title="raptor_serialize_start ()"><code class="function">raptor_serialize_start()</code></a>
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also serializes to an iostream like
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<a class="link" href="raptor-section-serializer.html#raptor-serialize-start-to-iostream" title="raptor_serialize_start_to_iostream ()"><code class="function">raptor_serialize_start_to_iostream()</code></a>
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but it becomes the owner of the passed in
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<a class="link" href="raptor-section-iostream.html#raptor-iostream" title="raptor_iostream"><span class="type">raptor_iostream</span></a>
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and destroys it at the end of serializing, so no further use of the
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iostream can be made by the caller.
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</p>
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</div>
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</div>
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