<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<script type="text/javascript" language="JavaScript">
function reDo() {
if (innerWidth != origWidth || innerHeight != origHeight)
location.reload();
}
if ((parseInt(navigator.appVersion) == 4) && (navigator.appName == "Netscape")) {
origWidth = innerWidth;
origHeight = innerHeight;
onresize = reDo;
}
onerror = null;
</script>
<style type="text/css">
< !-- div.WebHelpPopupMenu {
position: absolute;
left: 0px;
top: 0px;
z-index: 4;
visibility: hidden;
}
p.WebHelpNavBar {
text-align: right;
}
-->
</style>
<script type="text/javascript">
gRootRelPath = "../../../..";
gCommonRootRelPath = "../../../..";
gTopicId = "9.2.2.13.2_4";
<script type="text/javascript" src="../../../../template/scripts/rh.min.js"></script>
<script type="text/javascript" src="../../../../template/scripts/common.min.js"></script>
<script type="text/javascript" src="../../../../template/scripts/topic.min.js"></script>
<script type="text/javascript" src="../../../../template/scripts/topicwidgets.min.js"></script>
<script type="text/javascript" src="../../../../whxdata/projectsettings.js"></script>
<link rel="stylesheet" type="text/css" href="../../../../template/styles/topic.min.css"/>
<link rel="stylesheet" type="text/css" href="../../../../template/Charcoal_Grey/topicheader.css"/>
<meta name="topic-status" content="Draft"/>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>instance_exists</title>
<meta name="generator" content="Adobe RoboHelp 2019"/>
<link rel="stylesheet" href="../../../../assets/css/default.css" type="text/css"/>
<meta name="rh-authors" content="Mark Alexander"/>
<meta name="topic-comment" content="Page outlining the function instance_exists"/>
<meta name="rh-index-keywords" content="instance_exists"/>
<meta name="search-keywords" content="instance_exists"/>
</head>
<body>
<div class="topic-header rh-hide" id="rh-topic-header" onclick="rh._.goToFullLayout()">
<div class="logo">
</div>
<div class="nav">
<div class="title" title="instance_exists">
<span>instance_exists</span>
</div>
<div class="gotohome" title="Click here to see this page in full context">
<span>Click here to see this page in full context</span>
</div>
</div>
</div>
<div class="topic-header-shadow rh-hide" id="rh-topic-header-shadow"></div>
<h1>instance_exists</h1>
<p>This function can be used in two ways depending on what you wish to check. You can give it an object_index to check for, in which case this function will return <tt>true</tt> if any active instances of the specified object exist in the current room,
or you can also supply it with an instance id, in which case this function will return <tt>true</tt> if that specific instance exists and is active in the current room.</p>
<p>Please note that this function does <i>not</i> take into account those instances that have been deactivated using the <a href="Deactivating_Instances/Deactivating_Instances.htm">instance deactivate</a> functions.</p>
<p> </p>
<h4>Syntax:</h4>
<p class="code">instance_exists(obj);</p>
<table>
<tbody>
<tr>
<th>Argument</th>
<th>Description</th>
</tr>
<tr>
<td>obj</td>
<td>The object or instance to check for the existence of.</td>
</tr>
</tbody>
</table>
<p> </p>
<h4>Returns:</h4>
<p class="code">Boolean</p>
<p> </p>
<h4>Example:</h4>
<p class="code">if !instance_exists(obj_Enemy)<br/> {
<br/> score += 200;<br/> room_goto(rm_hiscores);
<br/> }
</p>
<p>The above code checks to see if any instances of the object "obj_Enemy" exist and if not it adds to the variable "score" and changes room.</p>
<p> </p>
<p> </p>
<p> </p>
<div class="footer">
<div class="buttons">
<div class="clear">
<div style="float:left">Back: <a href="Instances.htm">Instances</a></div>
<div style="float:right">Next: <a href="instance_change.htm">instance_change</a></div>
</div>
</div>
<h5>© Copyright YoYo Games Ltd. 2020 All Rights Reserved</h5>
</div>
</body></html>