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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<title>launch() \ Language (API) \ Processing 2+</title>
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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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<a href="libraries/index.html" >Libraries</a><br>
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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>launch()</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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void setup() {
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size(200, 200);
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}
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void draw() {
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// draw() must be present for mousePressed() to work
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}
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void mousePressed() {
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println("Opening Process_4");
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launch("/Applications/Process_4.app");
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}
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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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Attempts to open an application or file using your platform's launcher. The <b>filename</b> parameter is a String specifying the file name and location. The location parameter must be a full path name, or the name of an executable in the system's PATH. In most cases, using a full path is the best option, rather than relying on the system PATH. Be sure to make the file executable before attempting to open it (chmod +x).<br />
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<br />
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This function (roughly) emulates what happens when you double-click an application or document in the macOS Finder, the Windows Explorer, or your favorite Linux file manager. If you're trying to run command line functions directly, use the <b>exec()</b> function instead (see below).<br />
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<br />
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This function behaves differently on each platform. On Windows, the parameters are sent to the Windows shell via "cmd /c". On Mac OS X, the "open" command is used (type "man open" in Terminal.app for documentation). On Linux, it first tries gnome-open, then kde-open, but if neither are available, it sends the command to the shell and prays that something useful happens.<br />
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<br />
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For users familiar with Java, this is not the same as Runtime.exec(), because the launcher command is prepended. Instead, the <b>exec(String[])</b> function is a shortcut for Runtime.getRuntime.exec(String[]). The <b>exec()</b> function is documented in the <a href="http://processing.github.io/processing-javadocs/core/">JavaDoc</a> in the <b>PApplet</b> class.
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</td>
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</tr>
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<tr class=""><th scope="row">Syntax</th><td><pre>launch(<kbd>args</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">args</th>
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<td>String[]: arguments to the launcher, eg. a filename.</td>
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</tr></table></td> </tr>
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<tr class=""><th scope="row">Returns</th><td class="code">Process</td></tr>
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</table>
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Updated on April 30, 2017 02:33:16pm EDT<br /><br />
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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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