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<title>el:key [BASIC 256 - Language Documentation]</title>
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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="el_start.html" class="wikilink1" title="el:start">el</a></bdi> » <bdi><span class="curid"><a href="el_key.html" class="wikilink1" title="el:key">key</a></span></bdi></div>
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<h3 class="toggle">Table of Contents</h3>
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<ul class="toc">
<li class="level2"><div class="li"><a href="el_key.html#key">Key</a></div>
<ul class="toc">
<li class="level3"><div class="li"><a href="el_key.html#format">Format</a></div></li>
<li class="level3"><div class="li"><a href="el_key.html#description">Description</a></div></li>
<li class="level3"><div class="li"><a href="el_key.html#note">Note</a></div></li>
<li class="level3"><div class="li"><a href="el_key.html#partial_list_of_keys">Partial List of Keys</a></div></li>
<li class="level3"><div class="li"><a href="el_key.html#example">Example</a></div></li>
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<h2 class="sectionedit1" id="key">Key</h2>
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<h3 class="sectionedit2" id="format">Format</h3>
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<p>
key<br/>
key()
</p>
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<h3 class="sectionedit3" id="description">Description</h3>
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<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.
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<h3 class="sectionedit4" id="note">Note</h3>
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<pre class="code">if key = 47 then print key</pre>
<p>
will not display the desired results, because it'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>
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<h3 class="sectionedit5" id="partial_list_of_keys">Partial List of Keys</h3>
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<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>
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<tr class="row2">
<td class="col0">8=56</td><td class="col1" colspan="7">9=57</td>
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<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>
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<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>
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<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>
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<td class="col0">Y=89</td><td class="col1" colspan="7">Z=90</td>
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<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>
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</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>
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<h3 class="sectionedit7" id="example">Example</h3>
<div class="level3">
<pre class="code">#press any keys
loop:
pause 1
a = key
print a+" "+chr(a)
goto loop</pre>
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<div class="docInfo"><bdi>el/key.txt</bdi> · Last modified: 2014/01/11 23:26 (external edit)</div>
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