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<h1>
<small class="visible-xs">Elixir v1.7.2</small>
StringIO
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/string_io.ex#L1" title="View Source" class="view-source" rel="help">
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</h1>
<section id="moduledoc">
<p>Controls an IO device process that wraps a string.</p>
<p>A <a href="StringIO.html#content"><code class="inline">StringIO</code></a> IO device can be passed as a “device” to
most of the functions in the <a href="IO.html"><code class="inline">IO</code></a> module.</p>
<h2 id="module-examples" class="section-heading">
<a href="#module-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="p" data-group-id="1142731869-1">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">pid</span><span class="p" data-group-id="1142731869-1">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="1142731869-2">(</span><span class="s">"foo"</span><span class="p" data-group-id="1142731869-2">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">IO</span><span class="o">.</span><span class="n">read</span><span class="p" data-group-id="1142731869-3">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="1142731869-3">)</span><span class="w">
</span><span class="s">"fo"</span></code></pre>
</section>
<section id="summary" class="details-list">
<h1 class="section-heading">
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Summary
</h1>
<div class="summary-functions summary">
<h2>
<a href="#functions">Functions</a>
</h2>
<div class="summary-row">
<div class="summary-signature">
<a href="#child_spec/1">child_spec(arg)</a>
</div>
<div class="summary-synopsis"><p>Returns a specification to start this module under a supervisor</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#close/1">close(pid)</a>
</div>
<div class="summary-synopsis"><p>Stops the IO device and returns the remaining input/output
buffers</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#contents/1">contents(pid)</a>
</div>
<div class="summary-synopsis"><p>Returns the current input/output buffers for the given IO
device</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#flush/1">flush(pid)</a>
</div>
<div class="summary-synopsis"><p>Flushes the output buffer and returns its current contents</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#open/2">open(path, options_or_function \\ [])</a>
</div>
<div class="summary-synopsis"><p>Creates an IO device</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#open/3">open(string, options, function)</a>
</div>
<div class="summary-synopsis"><p>Creates an IO device</p>
</div>
</div>
</div>
</section>
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Functions
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<span class="signature">child_spec(arg)</span>
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<section class="docstring">
<p>Returns a specification to start this module under a supervisor.</p>
<p>See <a href="Supervisor.html"><code class="inline">Supervisor</code></a>.</p>
</section>
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<pre>close(<a href="typespecs.html#basic-types">pid</a>()) :: {:ok, {<a href="typespecs.html#built-in-types">binary</a>(), <a href="typespecs.html#built-in-types">binary</a>()}}</pre>
</div>
</div>
<section class="docstring">
<p>Stops the IO device and returns the remaining input/output
buffers.</p>
<h2 id="close/1-examples" class="section-heading">
<a href="#close/1-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="p" data-group-id="3530886991-1">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">pid</span><span class="p" data-group-id="3530886991-1">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="3530886991-2">(</span><span class="s">"in"</span><span class="p" data-group-id="3530886991-2">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">IO</span><span class="o">.</span><span class="n">write</span><span class="p" data-group-id="3530886991-3">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">"out"</span><span class="p" data-group-id="3530886991-3">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">close</span><span class="p" data-group-id="3530886991-4">(</span><span class="n">pid</span><span class="p" data-group-id="3530886991-4">)</span><span class="w">
</span><span class="p" data-group-id="3530886991-5">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="3530886991-6">{</span><span class="s">"in"</span><span class="p">,</span><span class="w"> </span><span class="s">"out"</span><span class="p" data-group-id="3530886991-6">}</span><span class="p" data-group-id="3530886991-5">}</span></code></pre>
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<span class="signature">contents(pid)</span>
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<div class="specs">
<pre>contents(<a href="typespecs.html#basic-types">pid</a>()) :: {<a href="typespecs.html#built-in-types">binary</a>(), <a href="typespecs.html#built-in-types">binary</a>()}</pre>
</div>
</div>
<section class="docstring">
<p>Returns the current input/output buffers for the given IO
device.</p>
<h2 id="contents/1-examples" class="section-heading">
<a href="#contents/1-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="p" data-group-id="9126780749-1">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">pid</span><span class="p" data-group-id="9126780749-1">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="9126780749-2">(</span><span class="s">"in"</span><span class="p" data-group-id="9126780749-2">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">IO</span><span class="o">.</span><span class="n">write</span><span class="p" data-group-id="9126780749-3">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">"out"</span><span class="p" data-group-id="9126780749-3">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="9126780749-4">(</span><span class="n">pid</span><span class="p" data-group-id="9126780749-4">)</span><span class="w">
</span><span class="p" data-group-id="9126780749-5">{</span><span class="s">"in"</span><span class="p">,</span><span class="w"> </span><span class="s">"out"</span><span class="p" data-group-id="9126780749-5">}</span></code></pre>
</section>
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<span class="signature">flush(pid)</span>
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<pre>flush(<a href="typespecs.html#basic-types">pid</a>()) :: <a href="typespecs.html#built-in-types">binary</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Flushes the output buffer and returns its current contents.</p>
<h2 id="flush/1-examples" class="section-heading">
<a href="#flush/1-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="p" data-group-id="2822726022-1">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">pid</span><span class="p" data-group-id="2822726022-1">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="2822726022-2">(</span><span class="s">"in"</span><span class="p" data-group-id="2822726022-2">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">IO</span><span class="o">.</span><span class="n">write</span><span class="p" data-group-id="2822726022-3">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">"out"</span><span class="p" data-group-id="2822726022-3">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">flush</span><span class="p" data-group-id="2822726022-4">(</span><span class="n">pid</span><span class="p" data-group-id="2822726022-4">)</span><span class="w">
</span><span class="s">"out"</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="2822726022-5">(</span><span class="n">pid</span><span class="p" data-group-id="2822726022-5">)</span><span class="w">
</span><span class="p" data-group-id="2822726022-6">{</span><span class="s">"in"</span><span class="p">,</span><span class="w"> </span><span class="s">""</span><span class="p" data-group-id="2822726022-6">}</span></code></pre>
</section>
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<div class="detail" id="open/2">
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<span class="signature">open(path, options_or_function \\ [])</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/string_io.ex#L110" class="view-source" rel="help" title="View Source">
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<div class="specs">
<pre>open(<a href="typespecs.html#built-in-types">binary</a>(), <a href="typespecs.html#built-in-types">keyword</a>()) :: {:ok, <a href="typespecs.html#basic-types">pid</a>()}</pre>
<pre>open(<a href="typespecs.html#built-in-types">binary</a>(), (<a href="typespecs.html#basic-types">pid</a>() -> res)) :: {:ok, res} when res: var</pre>
</div>
</div>
<section class="docstring">
<p>Creates an IO device.</p>
<p><code class="inline">string</code> will be the initial input of the newly created
device.</p>
<p><code class="inline">options_or_function</code> can be a keyword list of options or
a function.</p>
<p>If options are provided, the result will be <code class="inline">{:ok, pid}</code>, returning the
IO device created. The option <code class="inline">:capture_prompt</code>, when set to <code class="inline">true</code>, causes
prompts (which are specified as arguments to <code class="inline">IO.get*</code> functions) to be
included in the device’s output.</p>
<p>If a function is provided, the device will be created and sent to the
function. When the function returns, the device will be closed. The final
result will be a tuple with <code class="inline">:ok</code> and the result of the function.</p>
<h2 id="open/2-examples" class="section-heading">
<a href="#open/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="p" data-group-id="3147628275-1">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">pid</span><span class="p" data-group-id="3147628275-1">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="3147628275-2">(</span><span class="s">"foo"</span><span class="p" data-group-id="3147628275-2">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">IO</span><span class="o">.</span><span class="n">gets</span><span class="p" data-group-id="3147628275-3">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">">"</span><span class="p" data-group-id="3147628275-3">)</span><span class="w">
</span><span class="s">"foo"</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="3147628275-4">(</span><span class="n">pid</span><span class="p" data-group-id="3147628275-4">)</span><span class="w">
</span><span class="p" data-group-id="3147628275-5">{</span><span class="s">""</span><span class="p">,</span><span class="w"> </span><span class="s">""</span><span class="p" data-group-id="3147628275-5">}</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="p" data-group-id="3147628275-6">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">pid</span><span class="p" data-group-id="3147628275-6">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="3147628275-7">(</span><span class="s">"foo"</span><span class="p">,</span><span class="w"> </span><span class="ss">capture_prompt</span><span class="p">:</span><span class="w"> </span><span class="no">true</span><span class="p" data-group-id="3147628275-7">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">IO</span><span class="o">.</span><span class="n">gets</span><span class="p" data-group-id="3147628275-8">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">">"</span><span class="p" data-group-id="3147628275-8">)</span><span class="w">
</span><span class="s">"foo"</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="3147628275-9">(</span><span class="n">pid</span><span class="p" data-group-id="3147628275-9">)</span><span class="w">
</span><span class="p" data-group-id="3147628275-10">{</span><span class="s">""</span><span class="p">,</span><span class="w"> </span><span class="s">">"</span><span class="p" data-group-id="3147628275-10">}</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="3147628275-11">(</span><span class="s">"foo"</span><span class="p">,</span><span class="w"> </span><span class="k" data-group-id="3147628275-12">fn</span><span class="p" data-group-id="3147628275-13">(</span><span class="n">pid</span><span class="p" data-group-id="3147628275-13">)</span><span class="w"> </span><span class="o">-></span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">IO</span><span class="o">.</span><span class="n">gets</span><span class="p" data-group-id="3147628275-14">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">">"</span><span class="p" data-group-id="3147628275-14">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">IO</span><span class="o">.</span><span class="n">write</span><span class="p" data-group-id="3147628275-15">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">"The input was </span><span class="si" data-group-id="3147628275-16">#{</span><span class="n">input</span><span class="si" data-group-id="3147628275-16">}</span><span class="s">"</span><span class="p" data-group-id="3147628275-15">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="3147628275-17">(</span><span class="n">pid</span><span class="p" data-group-id="3147628275-17">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="k" data-group-id="3147628275-12">end</span><span class="p" data-group-id="3147628275-11">)</span><span class="w">
</span><span class="p" data-group-id="3147628275-18">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="3147628275-19">{</span><span class="s">""</span><span class="p">,</span><span class="w"> </span><span class="s">"The input was foo"</span><span class="p" data-group-id="3147628275-19">}</span><span class="p" data-group-id="3147628275-18">}</span></code></pre>
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<span class="signature">open(string, options, function)</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/string_io.ex#L51" class="view-source" rel="help" title="View Source">
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<span class="note">(since 1.7.0)</span>
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<pre>open(<a href="typespecs.html#built-in-types">binary</a>(), <a href="typespecs.html#built-in-types">keyword</a>(), (<a href="typespecs.html#basic-types">pid</a>() -> res)) :: {:ok, res} when res: var</pre>
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<section class="docstring">
<p>Creates an IO device.</p>
<p><code class="inline">string</code> will be the initial input of the newly created
device.</p>
<p>If the <code class="inline">:capture_prompt</code> option is set to <code class="inline">true</code>,
prompts (specified as arguments to <code class="inline">IO.get*</code> functions)
are captured in the output.</p>
<p>The device will be created and sent to the function given.
When the function returns, the device will be closed. The final
result will be a tuple with <code class="inline">:ok</code> and the result of the function.</p>
<h2 id="open/3-examples" class="section-heading">
<a href="#open/3-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="1318303380-1">(</span><span class="s">"foo"</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="1318303380-2">[</span><span class="p" data-group-id="1318303380-2">]</span><span class="p">,</span><span class="w"> </span><span class="k" data-group-id="1318303380-3">fn</span><span class="p" data-group-id="1318303380-4">(</span><span class="n">pid</span><span class="p" data-group-id="1318303380-4">)</span><span class="w"> </span><span class="o">-></span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">IO</span><span class="o">.</span><span class="n">gets</span><span class="p" data-group-id="1318303380-5">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">">"</span><span class="p" data-group-id="1318303380-5">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">IO</span><span class="o">.</span><span class="n">write</span><span class="p" data-group-id="1318303380-6">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">"The input was </span><span class="si" data-group-id="1318303380-7">#{</span><span class="n">input</span><span class="si" data-group-id="1318303380-7">}</span><span class="s">"</span><span class="p" data-group-id="1318303380-6">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="1318303380-8">(</span><span class="n">pid</span><span class="p" data-group-id="1318303380-8">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="k" data-group-id="1318303380-3">end</span><span class="p" data-group-id="1318303380-1">)</span><span class="w">
</span><span class="p" data-group-id="1318303380-9">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="1318303380-10">{</span><span class="s">""</span><span class="p">,</span><span class="w"> </span><span class="s">"The input was foo"</span><span class="p" data-group-id="1318303380-10">}</span><span class="p" data-group-id="1318303380-9">}</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="1318303380-11">(</span><span class="s">"foo"</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="1318303380-12">[</span><span class="ss">capture_prompt</span><span class="p">:</span><span class="w"> </span><span class="no">true</span><span class="p" data-group-id="1318303380-12">]</span><span class="p">,</span><span class="w"> </span><span class="k" data-group-id="1318303380-13">fn</span><span class="p" data-group-id="1318303380-14">(</span><span class="n">pid</span><span class="p" data-group-id="1318303380-14">)</span><span class="w"> </span><span class="o">-></span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">IO</span><span class="o">.</span><span class="n">gets</span><span class="p" data-group-id="1318303380-15">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">">"</span><span class="p" data-group-id="1318303380-15">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">IO</span><span class="o">.</span><span class="n">write</span><span class="p" data-group-id="1318303380-16">(</span><span class="n">pid</span><span class="p">,</span><span class="w"> </span><span class="s">"The input was </span><span class="si" data-group-id="1318303380-17">#{</span><span class="n">input</span><span class="si" data-group-id="1318303380-17">}</span><span class="s">"</span><span class="p" data-group-id="1318303380-16">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="w"> </span><span class="nc">StringIO</span><span class="o">.</span><span class="n">contents</span><span class="p" data-group-id="1318303380-18">(</span><span class="n">pid</span><span class="p" data-group-id="1318303380-18">)</span><span class="w">
</span><span class="gp unselectable">...> </span><span class="k" data-group-id="1318303380-13">end</span><span class="p" data-group-id="1318303380-11">)</span><span class="w">
</span><span class="p" data-group-id="1318303380-19">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="1318303380-20">{</span><span class="s">""</span><span class="p">,</span><span class="w"> </span><span class="s">">The input was foo"</span><span class="p" data-group-id="1318303380-20">}</span><span class="p" data-group-id="1318303380-19">}</span></code></pre>
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