190 lines
8.3 KiB
HTML
190 lines
8.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title>createInput() \ Language (API) \ Processing 2+</title>
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<link rel="icon" href="/favicon.ico" type="image/x-icon" />
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="Author" content="Processing Foundation" />
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<meta name="Publisher" content="Processing Foundation" />
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<meta name="Keywords" content="Processing, Sketchbook, Programming, Coding, Code, Art, Design" />
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<meta name="Description" content="Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology." />
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<meta name="Copyright" content="All contents copyright the Processing Foundation, Ben Fry, Casey Reas, and the MIT Media Laboratory" />
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</head>
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<body id="Langauge-en" onload="" >
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<div id="ribbon">
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<ul class="left">
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<li class="highlight"><a href="http://processing.org/">Processing</a></li>
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<li><a href="http://p5js.org/">p5.js</a></li>
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<li><a href="http://py.processing.org/">Processing.py</a></li>
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<li><a href="https://processingfoundation.org/">Processing Foundation</a></li>
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<div id="header">
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<a href="/" title="Back to the Processing cover."><div class="processing-logo no-cover" alt="Processing cover"></div></a>
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<form name="search" method="get" action="//www.google.com/search">
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<p><input type="hidden" name="as_sitesearch" value="processing.org" />
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<input type="text" name="as_q" value="" size="20" class="text" />
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<input type="submit" value=" " /></p>
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</form>
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<a id="TOP" name="TOP"></a>
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<div id="navigation">
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<div class="navBar" id="mainnav">
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<a href="index.html" class='active'>Language</a><br>
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<a href="libraries/index.html" >Libraries</a><br>
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<a href="tools/index.html">Tools</a><br>
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<a href="environment/index.html">Environment</a><br>
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</div>
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<script> document.querySelectorAll(".processing-logo")[0].className = "processing-logo"; </script>
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</div>
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<!-- ==================================== CONTENT - Headers ============================ -->
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<div class="content">
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<p class="ref-notice">This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, <a href="https://github.com/processing/processing-docs/issues?state=open">please let us know</a>. If you prefer a more technical reference, visit the <a href="http://processing.github.io/processing-javadocs/core/">Processing Core Javadoc</a> and <a href="http://processing.github.io/processing-javadocs/libraries/">Libraries Javadoc</a>.</p>
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>createInput()</h3></td>
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</tr>
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<tr class="">
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<tr class=""><th scope="row">Examples</th><td><div class="example"><pre >
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// Load the local file 'data.txt' and initialize a new InputStream
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InputStream input = createInput("data.txt");
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String content = "";
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try {
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int data = input.read();
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while (data != -1) {
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content += data;
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data = input.read();
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}
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}
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catch (IOException e) {
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e.printStackTrace();
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}
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finally {
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try {
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input.close();
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}
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catch (IOException e) {
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e.printStackTrace();
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}
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}
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println(content);
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</pre></div>
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</td></tr>
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<tr class="">
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<th scope="row">Description</th>
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<td>
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This is a shorthand function for advanced programmers to initialize and open a Java InputStream. It's useful if you want to use the facilities provided by PApplet to easily open files from the data folder or from a URL, but you need an InputStream object so that you can use other parts of Java to take more control of how the stream is read.<br />
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<br />
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The filename passed in can be:<br />
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- A URL, as in: <b>createInput("http://processing.org/")</b><br />
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- The name of a file in the sketch's <b>data</b> folder<br />
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- The full path to a file to be opened locally (when running as an application)<br />
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<br />
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If the requested item doesn't exist, null is returned. If not online, this will also check to see if the user is asking for a file whose name isn't properly capitalized. If capitalization is different, an error will be printed to the console. This helps prevent issues that appear when a sketch is exported to the web, where case sensitivity matters, as opposed to running from inside the Processing Development Environment on Windows or Mac OS, where case sensitivity is preserved but ignored.<br />
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<br />
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If the file ends with <b>.gz</b>, the stream will automatically be gzip decompressed. If you don't want the automatic decompression, use the related function <b>createInputRaw()</b>.<br />
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<br />
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In earlier releases, this function was called <b>openStream()</b>.
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</td>
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</tr>
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<tr class=""><th scope="row">Syntax</th><td><pre>createInput(<kbd>filename</kbd>)</pre></td></tr>
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<tr class=""> <th scope="row">Parameters</th><td><table cellpadding="0" cellspacing="0" border="0"><tr class="">
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<th scope="row" class="code">filename</th>
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<td>String: the name of the file to use as input</td>
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</tr></table></td> </tr>
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<tr class=""><th scope="row">Returns</th><td class="code">InputStream</td></tr>
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<tr class=""><th scope="row">Related</th><td><a class="code" href="createOutput_.html">createOutput()</a><br />
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<a class="code" href="selectOutput_.html">selectOutput()</a><br />
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<a class="code" href="selectInput_.html">selectInput()</a><br /></td></tr>
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</table>
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Updated on April 30, 2017 02:33:17pm EDT<br /><br />
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<div class="license">
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<div id="copyright">Processing is an open project intiated by <a href="http://benfry.com/">Ben Fry</a> and <a href="http://reas.com">Casey Reas</a>. It is developed by a <a href="http://processing.org/about/people/">team of volunteers</a>.</div>
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