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| <h1 id="quick-start">Quick Start</h1> |
| <p>This will quickly go over the parts of using FlatBuffers to serialize some data. |
| See the <a href="../tutorial/">Tutorial</a> for a more in depth guide.</p> |
| <ol> |
| <li> |
| <p><strong>Build the compiler for FlatBuffers (<a href="../flatc/"><code>flatc</code></a>)</strong></p> |
| <div class="highlight"><pre><span></span><code>cmake<span class="w"> </span>-G<span class="w"> </span><span class="s2">"Unix Makefiles"</span> |
| make<span class="w"> </span>-j |
| </code></pre></div> |
| </li> |
| <li> |
| <p><strong>Define your FlatBuffer <a href="../schema/">schema</a> (<code>.fbs</code>)</strong></p> |
| <div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">monster.fbs</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span> |
| <span class="normal">2</span> |
| <span class="normal">3</span> |
| <span class="normal">4</span> |
| <span class="normal">5</span> |
| <span class="normal">6</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="n">table</span><span class="w"> </span><span class="n">Monster</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="nl">name</span><span class="p">:</span><span class="n">string</span><span class="p">;</span> |
| <span class="w"> </span><span class="nl">health</span><span class="p">:</span><span class="kt">int</span><span class="p">;</span> |
| <span class="p">}</span> |
| |
| <span class="n">root_type</span><span class="w"> </span><span class="n">Monster</span><span class="p">;</span> |
| </code></pre></div></td></tr></table></div> |
| <p>See <a href="https://github.com/google/flatbuffers/blob/master/samples/monster.fbs">monster.fbs</a> |
| for an complete example.</p> |
| </li> |
| <li> |
| <p><strong>Generate code for your language(s)</strong></p> |
| <p>Use the <code>flatc</code> compiler to take your schema and generate language-specific |
| code:</p> |
| <div class="highlight"><pre><span></span><code>./flatc<span class="w"> </span>--cpp<span class="w"> </span>--rust<span class="w"> </span>monster.fbs |
| </code></pre></div> |
| <p>Which generates <code>monster_generated.h</code> and <code>monster_generated.rs</code> files.</p> |
| </li> |
| <li> |
| <p><strong>Serialize data</strong></p> |
| <p>Use the generated code files, as well as the <code>FlatBufferBuilder</code> to construct |
| your serialized buffer.</p> |
| <div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">my_monster_factory.cc</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 1</span> |
| <span class="normal"> 2</span> |
| <span class="normal"> 3</span> |
| <span class="normal"> 4</span> |
| <span class="normal"> 5</span> |
| <span class="normal"> 6</span> |
| <span class="normal"> 7</span> |
| <span class="normal"> 8</span> |
| <span class="normal"> 9</span> |
| <span class="normal">10</span> |
| <span class="normal">11</span> |
| <span class="normal">12</span> |
| <span class="normal">13</span> |
| <span class="normal">14</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="cp">#include</span><span class="w"> </span><span class="cpf">"flatbuffers.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"monster_generated.h"</span> |
| |
| <span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span> |
| <span class="w"> </span><span class="c1">// Used to build the flatbuffer</span> |
| <span class="w"> </span><span class="n">FlatBufferBuilder</span><span class="w"> </span><span class="n">builder</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="c1">// Auto-generated function emitted from `flatc` and the input </span> |
| <span class="w"> </span><span class="c1">// `monster.fbs` schema.</span> |
| <span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">monster</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">CreateMonsterDirect</span><span class="p">(</span><span class="n">builder</span><span class="p">,</span><span class="w"> </span><span class="s">"Abominable Snowman"</span><span class="p">,</span><span class="w"> </span><span class="mi">100</span><span class="p">);</span> |
| |
| <span class="w"> </span><span class="c1">// Finalize the buffer.</span> |
| <span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">Finish</span><span class="p">(</span><span class="n">monster</span><span class="p">);</span> |
| <span class="p">}</span> |
| </code></pre></div></td></tr></table></div> |
| <p>See complete <a href="https://github.com/google/flatbuffers/blob/master/samples/sample_binary.cpp#L24-L56">C++ Example</a>.</p> |
| </li> |
| <li> |
| <p><strong>Transmit/Store the serialized FlatBuffer</strong></p> |
| <p>Use your serialized buffer however you want. Send it to someone, save if for |
| later, etc...</p> |
| <div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">my_monster_factory.cc</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">13</span> |
| <span class="normal">14</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="c1">// Get a pointer to the flatbuffer.</span> |
| <span class="k">const</span><span class="w"> </span><span class="kt">uint8_t</span><span class="o">*</span><span class="w"> </span><span class="n">flatbuffer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">GetBufferPointer</span><span class="p">();</span> |
| </code></pre></div></td></tr></table></div> |
| </li> |
| <li> |
| <p><strong>Read the data</strong></p> |
| <p>Use the generated accessors to read the data from the serialized buffer.</p> |
| <p>It doesn't need to be the same language, or even schema version (see |
| <a href="../evolution/">Evolving</a>), FlatBuffers ensures the data is readable across |
| languages and schema versions. </p> |
| <div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">my_monster_factory.cc</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">15</span> |
| <span class="normal">16</span> |
| <span class="normal">17</span> |
| <span class="normal">18</span> |
| <span class="normal">19</span> |
| <span class="normal">20</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="c1">// Get a view of the root monster from the flatbuffer.</span> |
| <span class="k">const</span><span class="w"> </span><span class="n">Monster</span><span class="w"> </span><span class="n">snowman</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">GetMonster</span><span class="p">(</span><span class="n">flatbuffer</span><span class="p">);</span> |
| |
| <span class="c1">// Access the monster's fields directly.</span> |
| <span class="n">ASSERT_EQ</span><span class="p">(</span><span class="n">snowman</span><span class="o">-></span><span class="n">name</span><span class="p">(),</span><span class="w"> </span><span class="s">"Abominable Snowman"</span><span class="p">);</span> |
| <span class="n">ASSERT_EQ</span><span class="p">(</span><span class="n">snowman</span><span class="o">-></span><span class="n">health</span><span class="p">(),</span><span class="w"> </span><span class="mi">100</span><span class="p">);</span> |
| </code></pre></div></td></tr></table></div> |
| <p>See <a href="https://github.com/google/flatbuffers/blob/master/samples/sample_binary.rs#L92-L106"><code>Rust</code> examples</a> |
| for reading the data written by <code>C++</code>.</p> |
| </li> |
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