<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>sensekey</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="sense.html" title="sense" /> <link rel="next" href="serialBegin.html" title="serialBegin" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">sensekey</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="sense.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="serialBegin.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="sensekey"></a> <div class="titlepage"></div> <a id="IndexSensekey" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">sensekey</span> </h2> <p>sensekey — Returns the ASCII code of a key that has been pressed. </p> </div> <div class="refsect1"> <a id="idm281472892398904"></a> <h2>Description</h2> <p> Returns the ASCII code of a key that has been pressed, or -1 if no key has been pressed. </p> </div> <div class="refsect1"> <a id="idm281472892356872"></a> <h2>Syntax</h2> <pre class="synopsis">kres[, kkeydown] <span class="command"><strong>sensekey</strong></span></pre> </div> <div class="refsect1"> <a id="idm281472892354920"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>kres</em></span> - returns the ASCII value of a key which is pressed or released. </p> <p> <span class="emphasis"><em>kkeydown</em></span> - returns 1 if the key was pressed, 0 if it was released or if there is no key event. </p> <p> <span class="emphasis"><em>kres</em></span> can be used to read keyboard events from stdin and returns the ASCII value of any key that is pressed or released, or it returns -1 when there is no keyboard activity. The value of <span class="emphasis"><em>kkeydown</em></span> is 1 when a key was pressed, or 0 otherwise. This behavior is emulated by default, so a key release is generated immediately after every key press. To have full functionality, FLTK can be used to capture keyboard events. <a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a> can be used to capture keyboard events and send them to the sensekey opcode, by adding an additional optional argument. See <a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a> for more information. </p> <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"> <table border="0" summary="Note: Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"> <img alt="[Note]" src="images/note.png" /> </td> <th align="left">Note</th> </tr> <tr> <td align="left" valign="top"> <p> This opcode can also be written as <a class="link" href="sense.html" title="sense"><em class="citetitle">sense</em></a>. </p> </td> </tr> </table> </div> </div> <div class="refsect1"> <a id="idm281472892346184"></a> <h2>Examples</h2> <p> Here is an example of the sensekey opcode. It uses the file <a class="ulink" href="examples/sensekey.csd" target="_top"><em class="citetitle">sensekey.csd</em></a>. </p> <div class="example"> <a id="idm281472892344408"></a> <p class="title"> <strong>Example 868. Example of the sensekey opcode.</strong> </p> <div class="example-contents"> <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p> <div class="refsect1"> <a id="idm281472715120104"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> <span class="c1">; Audio out Audio in</span> -odac -iadc <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o sensekey.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Initialize the global variables.</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Instrument #1.</span> <span class="kd">instr</span> <span class="nf">1</span> k<span class="n">1</span> <span class="nb">sensekey</span> <span class="nb">printk2</span> k<span class="n">1</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Play Instrument #1 for thirty seconds.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">30</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> Here is what the output should look like when the "q" button is pressed... </p> <pre class="screen"> q i1 113.00000 </pre> <p> </p> <p> Here is an example of the sensekey opcode in conjucntion with <a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a>. It uses the file <a class="ulink" href="examples/FLpanel-sensekey.csd" target="_top"><em class="citetitle">FLpanel-sensekey.csd</em></a>. </p> <div class="example"> <a id="idm281472892337416"></a> <p class="title"> <strong>Example 869. Example of the sensekey opcode using keyboard capture from an FLpanel.</strong> </p> <div class="example-contents"> <div class="refsect1"> <a id="idm281472712827832"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> <span class="c1">; Audio out Audio in No messages</span> -odac -iadc -d <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o FLpanel-sensekey.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Example by Johnathan Murphy</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">128</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span> <span class="c1">; ikbdcapture flag set to 1</span> i<span class="n">key</span> <span class="nb">init</span> <span class="mi">1</span> <span class="nb">FLpanel</span> <span class="s">"sensekey"</span><span class="p">,</span> <span class="mi">740</span><span class="p">,</span> <span class="mi">340</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">250</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> i<span class="n">key</span> gk<span class="n">asc</span><span class="p">,</span> gi<span class="n">asc</span> <span class="nb">FLbutBank</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">16</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">700</span><span class="p">,</span> <span class="mi">300</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span> <span class="nb">FLpanelEnd</span> <span class="nb">FLrun</span> <span class="kd">instr</span> <span class="nf">1</span> k<span class="n">key</span> <span class="nb">sensekey</span> k<span class="n">print</span> <span class="nb">changed</span> k<span class="n">key</span> <span class="nb">FLsetVal</span> k<span class="n">print</span><span class="p">,</span> k<span class="n">key</span><span class="p">,</span> gi<span class="n">asc</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">60</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> The lit button in the FLpanel window shows the last key pressed. </p> <p> Here is a more complex example of the sensekey opcode in conjucntion with <a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a>. It uses the file <a class="ulink" href="examples/FLpanel-sensekey.csd" target="_top"><em class="citetitle">FLpanel-sensekey2.csd</em></a>. </p> <div class="example"> <a id="idm281472892333480"></a> <p class="title"> <strong>Example 870. Example of the sensekey opcode using keyboard capture from an FLpanel.</strong> </p> <div class="example-contents"> <div class="refsect1"> <a id="idm281472712746104"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> <span class="c1">; Audio out Audio in No messages</span> -odac <span class="c1">; -iadc -d ;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o FLpanel-sensekey2.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">48000</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Example by Istvan Varga</span> <span class="c1">; if the FLTK opcodes are commented out, sensekey will read keyboard</span> <span class="c1">; events from stdin</span> <span class="nb">FLpanel</span> <span class="s">""</span><span class="p">,</span> <span class="mi">150</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">FLlabel</span> <span class="mi">18</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span> <span class="nb">FLgroup</span> <span class="s">"Keyboard Input"</span><span class="p">,</span> <span class="mi">150</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span> <span class="nb">FLgroupEnd</span> <span class="nb">FLpanelEnd</span> <span class="nb">FLrun</span> <span class="kd">instr</span> <span class="nf">1</span> k<span class="n">trig1</span> <span class="nb">init</span> <span class="mi">1</span> k<span class="n">trig2</span> <span class="nb">init</span> <span class="mi">1</span> <span class="nl">nxtKey1</span><span class="p">:</span> k<span class="n">1</span><span class="p">,</span> k<span class="n">2</span> <span class="nb">sensekey</span> <span class="k">if</span> <span class="p">(</span>k<span class="n">1</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span> <span class="o">||</span> k<span class="n">2</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="k">then</span> <span class="nb">printf</span> <span class="s">"Key code = </span><span class="si">%02X</span><span class="s">, state = </span><span class="si">%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">trig1</span><span class="p">,</span> k<span class="n">1</span><span class="p">,</span> k<span class="n">2</span> k<span class="n">trig1</span> <span class="o">=</span> <span class="mi">3</span> <span class="o">-</span> k<span class="n">trig1</span> <span class="k">kgoto</span> <span class="nl">nxtKey1</span> <span class="k">endif</span> <span class="nl">nxtKey2</span><span class="p">:</span> k<span class="n">3</span> <span class="nb">sensekey</span> <span class="k">if</span> <span class="p">(</span>k<span class="n">3</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="k">then</span> <span class="nb">printf</span> <span class="s">"Character = '</span><span class="si">%c</span><span class="s">'</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">trig2</span><span class="p">,</span> k<span class="n">3</span> k<span class="n">trig2</span> <span class="o">=</span> <span class="mi">3</span> <span class="o">-</span> k<span class="n">trig2</span> <span class="k">kgoto</span> <span class="nl">nxtKey2</span> <span class="k">endif</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3600</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> The console output will look something like: </p> <div class="literallayout"> <p><br /> new alloc for instr 1:<br /> Key code = 65, state = 1<br /> Character = 'e'<br /> Key code = 65, state = 0<br /> Key code = 72, state = 1<br /> Character = 'r'<br /> Key code = 72, state = 0<br /> Key code = 61, state = 1<br /> Character = 'a'<br /> Key code = 61, state = 0<br /> </p> </div> <p> </p> </div> <div class="refsect1"> <a id="idm281472892330280"></a> <h2>See also</h2> <p> <a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a>, <a class="link" href="FLkeyIn.html" title="FLkeyIn"><em class="citetitle">FLkeyIn</em></a> </p> </div> <div class="refsect1"> <a id="idm281472892327176"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: John ffitch</td> </tr> <tr> <td>University of Bath, Codemist. Ltd.</td> </tr> <tr> <td>Bath, UK</td> </tr> <tr> <td>October 2000</td> </tr> </table> <p> </p> <p>Examples written by Kevin Conder, Johnathan Murphy and Istvan Varga.</p> <p>New in Csound version 4.09. Renamed in Csound version 4.10.</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="sense.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="serialBegin.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">sense </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> serialBegin</td> </tr> </table> </div> </body> </html>