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<!DOCTYPE html>
<html lang="en" dir="ltr" class="no-js">
<head>
    <meta charset="utf-8" />
    <title>en:key [BASIC 256 - Language Documentation]</title>
<link rel="stylesheet" type="text/css" href="lib/exe/cssc171c1dfe8519125bb40a349172b001a.css"/>
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        <h1><a href="start.html"  accesskey="h" title="[H]"><img src="lib/tpl/dokuwiki/images/logo.png" width="64" height="64" alt="" /> <span>BASIC 256 - Language Documentation</span></a></h1>
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                            <div class="youarehere"><span class="bchead">You are here: </span><span class="home"><bdi><a href="start.html" class="wikilink1" title="start">start</a></bdi></span> » <bdi><a href="en_start.html" class="wikilink1" title="en:start">en</a></bdi> » <bdi><span class="curid"><a href="en_key.html" class="wikilink1" title="en:key">key</a></span></bdi></div>
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                <div class="pageId"><span>en:key</span></div>
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<h3 class="toggle">Table of Contents</h3>
<div>
<ul class="toc">
<li class="level2"><div class="li"><a href="en_key.html#key_function">Key (Function)</a></div>
<ul class="toc">
<li class="level3"><div class="li"><a href="en_key.html#format">Format</a></div></li>
<li class="level3"><div class="li"><a href="en_key.html#description">Description</a></div></li>
<li class="level3"><div class="li"><a href="en_key.html#note">Note</a></div></li>
<li class="level3"><div class="li"><a href="en_key.html#partial_list_of_keys">Partial List of Keys</a></div></li>
<li class="level3"><div class="li"><a href="en_key.html#example">Example</a></div></li>
<li class="level3"><div class="li"><a href="en_key.html#see_also">See Also</a></div></li>
</ul></li>
</ul>
</div>
</div>
<h2 class="sectionedit1" id="key_function">Key (Function)</h2>
<div class="level2">
</div>
<h3 class="sectionedit2" id="format">Format</h3>
<div class="level3">
<p>
key<br/>
key()
</p>
<p>
returns <em><a class="explain" href="en_key.html">positive_integer_value</a></em>
</p>
</div>
<h3 class="sectionedit3" id="description">Description</h3>
<div class="level3">
<p>
Immediately returns an integer value corresponding to the currently pressed keyboard key.  If no key has been pressed since the last call to the <strong>key</strong> function then the number zero (0) will be returned.  This function returns the code for the key pressed not always the <abbr title="American Standard Code for Information Interchange">ASCII</abbr> value of the character.
</p>
</div>
<h3 class="sectionedit4" id="note">Note</h3>
<div class="level3">
<pre class="code">if key = 47 then print key</pre>
<p>
will not display the desired results, because it&#039;s calling key twice in succession, and will return different values each time.  This code will do what you want:
</p>
<pre class="code">a = key
if a = 47 then print a</pre>
</div>
<h3 class="sectionedit5" id="partial_list_of_keys">Partial List of Keys</h3>
<div class="level3">
<div class="table sectionedit6"><table class="inline">
	<tr class="row0">
		<td class="col0">ESC=16777216</td><td class="col1" colspan="7">Space=32</td>
	</tr>
	<tr class="row1">
		<td class="col0">0=48</td><td class="col1">1=49</td><td class="col2">2=50</td><td class="col3">3=51</td><td class="col4">4=52</td><td class="col5">5=53</td><td class="col6">6=54</td><td class="col7">7=55</td>
	</tr>
	<tr class="row2">
		<td class="col0">8=56</td><td class="col1" colspan="7">9=57</td>
	</tr>
	<tr class="row3">
		<td class="col0">A=65</td><td class="col1">B=66</td><td class="col2">C=67</td><td class="col3">D=68</td><td class="col4">E=69</td><td class="col5">F=70</td><td class="col6">G=71</td><td class="col7">H=72</td>
	</tr>
	<tr class="row4">
		<td class="col0">I=73</td><td class="col1">J=74</td><td class="col2">K=75</td><td class="col3">L=76</td><td class="col4">M=77</td><td class="col5">N=78</td><td class="col6">O=79</td><td class="col7">P=80</td>
	</tr>
	<tr class="row5">
		<td class="col0">Q=81</td><td class="col1">R=82</td><td class="col2">S=83</td><td class="col3">T=84</td><td class="col4">U=85</td><td class="col5">V=86</td><td class="col6">W=87</td><td class="col7">X=88</td>
	</tr>
	<tr class="row6">
		<td class="col0">Y=89</td><td class="col1" colspan="7">Z=90</td>
	</tr>
	<tr class="row7">
		<td class="col0">Down Arrow=16777237</td><td class="col1">Up Arrow=16777235</td><td class="col2">Left Arrow=16777234</td><td class="col3" colspan="4">Right Arrow=16777236</td><td class="col7"></td>
	</tr>
</table></div>
<p>
<a href="http://qt-project.org/doc/qt-4.8/qt.html#Key-enum" class="urlextern" title="http://qt-project.org/doc/qt-4.8/qt.html#Key-enum"  rel="nofollow">Click here for a complete list of key values</a>
</p>
</div>
<h3 class="sectionedit7" id="example">Example</h3>
<div class="level3">
<pre class="code">#press any keys
loop:
pause 1
a = key
print a+&quot;  &quot;+chr(a)
goto loop</pre>
</div>
<h3 class="sectionedit8" id="see_also">See Also</h3>
<div class="level3">
</div>
<div class="plugin_include_content plugin_include__en:start">
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<p>
<a href="en_alert.html" class="wikilink1" title="en:alert">Alert</a>, <a href="en_confirm.html" class="wikilink1" title="en:confirm">Confirm</a>, <a href="en_input.html" class="wikilink1" title="en:input">Input</a>, <span class="curid"><a href="en_key.html" class="wikilink1" title="en:key">Key</a></span>, <a href="en_prompt.html" class="wikilink1" title="en:prompt">Prompt</a>
</p>
</div>
</div>
<div class="level3">
</div>
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                <div class="docInfo"><bdi>en/key.txt</bdi> · Last modified: 2014/02/09 20:35 by <bdi>admin</bdi></div>
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