org.symbian.tools.wrttools.doc.WebDeveloper/html/GUID-350F3C29-923E-4C30-8B14-C3D594BB8E39.html
author Eugene Ostroukhov <eugeneo@symbian.org>
Mon, 15 Mar 2010 17:56:08 -0700
changeset 268 ef733cd772bb
parent 229 716254ccbcc0
permissions -rw-r--r--
Bug 2213 - User is not prompted to save when debug session is started
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<!DOCTYPE html
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  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><meta name="copyright" content="(C) Copyright 2009"/><meta name="DC.rights.owner" content="(C) Copyright 2009"/><meta name="DC.Type" content="mobileconcept"/><meta name="DC.Title" content="Sensor Service API example"/><meta name="DC.Relation" scheme="URI" content="GUID-46FAFCDA-BCF3-41CB-B154-C17BBF7CD755"/><meta name="DC.Relation" scheme="URI" content="GUID-7C69DDA4-16F1-4A8F-BDB2-4CB0015B4E81"/><meta name="DC.Relation" scheme="URI" content="GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C"/><meta name="DC.Relation" scheme="URI" content="GUID-B77C2006-879F-4AC6-B7BF-04B25B563A29"/><meta name="DC.Format" content="XHTML"/><meta name="DC.Identifier" content="GUID-350F3C29-923E-4C30-8B14-C3D594BB8E39"/><title>Sensor Service API example </title><script type="text/javascript">
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      function initPage() {}
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    </script><link href="../PRODUCT_PLUGIN/book.css" rel="stylesheet" type="text/css"/><link href="css/s60/style.css" rel="stylesheet" type="text/css" media="all"/></head><body onload="initPage();"><div class="body"><div class="contentLeft prTxt"><h1 class="pageHeading" id="GUID-350F3C29-923E-4C30-8B14-C3D594BB8E39">Sensor Service API example</h1><div>
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<p/>
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<p>This section presents the full source code of a working sample widget
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for the <a href="GUID-6FBE64B7-0949-4AAE-B835-52B276540A59.html#GUID-6FBE64B7-0949-4AAE-B835-52B276540A59">Sensor Service</a>.
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You can download the <code>wgz</code> package for this widget from
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section <a href="GUID-775005BC-2FF8-45A9-BBA6-6CED6B5780A2.html#GUID-775005BC-2FF8-45A9-BBA6-6CED6B5780A2">Example widgets</a>.</p>
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<p>For general information about creating widgets, see section <a href="GUID-0E3095DB-03FF-4240-83F2-6D876AD2083A.html#GUID-0E3095DB-03FF-4240-83F2-6D876AD2083A">Widget component files</a>.</p>
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<p>For widget development and debugging purposes, this example writes its
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output to <code>c:\data\jslog_widget.log</code> using <code>console.info</code>.
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For instructions on how to enable logging in the Web browser for S60, see
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section <a href="GUID-B584CA90-543B-4AED-B134-A3A616259DB9.html#GUID-B584CA90-543B-4AED-B134-A3A616259DB9">JavaScript console</a>.</p>
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<div><h3>Info.plist</h3>
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<pre class="codeblock" id="GUID-CD42B8F8-DF33-4605-B365-0834C7DF4A9F">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
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&lt;!DOCTYPE plist PUBLIC "-//Nokia//DTD PLIST 1.0//EN" "http://www.nokia.com/NOKIA_COM_1/DTDs/plist-1.0.dtd"&gt;
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&lt;plist version="1.0"&gt;
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&lt;dict&gt;
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  &lt;key&gt;DisplayName&lt;/key&gt;
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  &lt;string&gt;SensorSample&lt;/string&gt;
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  &lt;key&gt;Identifier&lt;/key&gt;
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  &lt;string&gt;com.nokia.widget.sapi.sensor.sample&lt;/string&gt;
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  &lt;key&gt;Version&lt;/key&gt;
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  &lt;string&gt;1.0&lt;/string&gt;
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  &lt;key&gt;MainHTML&lt;/key&gt;
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  &lt;string&gt;sensor-sample.html&lt;/string&gt;
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&lt;/dict&gt;
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&lt;/plist&gt;</pre>
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</div>
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<div><h3>sensor-sample.html</h3>
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<pre class="codeblock" id="GUID-2530A43F-A36C-472E-8B99-CD98B03CE5BE">&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"&gt;
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&lt;html&gt;
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  &lt;head&gt;
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    &lt;script type="text/javascript" src="js/common.js"&gt;&lt;/script&gt;
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    &lt;script type="text/javascript" src="js/sensor-sample.js" charset="utf-8"&gt;&lt;/script&gt;
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  &lt;/head&gt;
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  &lt;body onload='setup()' bgcolor="#ddeeff"&gt;
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    &lt;form name="frm"&gt;
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      &lt;h3&gt;Sapi Sensor Sample Widget&lt;/h3&gt;
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      &lt;input type="button" onclick="findSensorChannel('img1')" value="FindSensorChannel"&gt;&lt;img id="img1" src="pic/blank.png" width="25" height="25" align="center"&gt;&lt;br&gt;
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      &lt;input type="button" onclick="getChannelProperty('img2')" value="GetChannelProperty"&gt;&lt;img id="img2" src="pic/blank.png" width="25" height="25" align="center"&gt;&lt;br&gt;
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      &lt;input type="button" onclick="setChannelProperty('img3')" value="RegisterForNotification"&gt;&lt;img id="img5" src="pic/blank.png" width="25" height="25" align="center"&gt;&lt;br&gt;
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      &lt;input type="button" onclick="stopReceivingNotification('img6')" value="Cancel"&gt;&lt;img id="img6" src="pic/blank.png" width="25" height="25" align="center"&gt;&lt;hr&gt;
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      &lt;div class='sensor' id='sensor' bgcolor="#ddeeff" style=width:100%;height:100%;overflow:auto&gt;&lt;/div&gt;
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    &lt;/form&gt;
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  &lt;/body&gt;
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&lt;/html&gt;
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</pre>
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</div>
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<div><h3>common.js</h3>
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<pre class="codeblock" id="GUID-9276D901-4CAC-4CDD-AFC4-6A94C816785C">// common.js
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//
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// This file contains some utility functions
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// Check the error code and show the information to users
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function checkError(message, resultList, divId, imgId)
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{
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  var errCode = resultList.ErrorCode;
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  var msg = "";
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  if (errCode) {
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    msg = message + "&lt;BR&gt;" + "Failed Error: " + errCode + "&lt;BR&gt;";
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    if(resultList.ErrorMessage != undefined)
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      msg += "Error Message: " + resultList.ErrorMessage;
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    showIMG(imgId,"no"); 
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  } else {
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    showIMG(imgId,"yes"); 
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  }
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  //print error message
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  if(divId != null &amp;&amp; divId != undefined)
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    document.getElementById(divId).innerHTML = msg;
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  console.info(msg);
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  return errCode;
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}
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// Build the message by reading a iteratorable list in a recursive manner
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function showIterableList(iterator)
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{
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  var msg = "";
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  try
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  {
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    iterator.reset();
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    var item;
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    while (( item = iterator.getNext()) != undefined ){
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      msg += showObject( item );
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    }
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  }
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  catch(e)
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  {
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    alert('&lt;showIterableList&gt; ' + e);
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  }
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  return msg;
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}
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// Build the message by reading a JS object in a recursive manner
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function showObject( obj )
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{
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  var txt = "";
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  try { 
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    if ( typeof obj != 'object' )
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      return "" + obj + '&lt;BR/&gt;';
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    else {
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      for(var key in obj) {
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        txt +=  key + ":";
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        txt += showObject( obj[key] );
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        txt += '&lt;BR/&gt;';
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      }
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      txt += '&lt;BR/&gt;';
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    }
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  } 
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  catch (e) 
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  {
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    alert("showObject: " + e);
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  }
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  return txt;
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}
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// Show the image to indicate the test result
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function showIMG(imgId, isOK) 
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{
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  if(imgId == null || imgId == undefined)
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    return;
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  if(isOK == "yes")
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    document.getElementById(imgId).src = "pic/yes.png";
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  else if(isOK == "no")
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    document.getElementById(imgId).src = "pic/no.png";
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  else
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    document.getElementById(imgId).src = "pic/blank.png";
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}
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// Show elements in object by using 'alert'
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function testObject(obj)
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{
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  var msg = "";
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  for(var key in obj) {
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    msg = msg + ":" + key + "=" + obj[key];
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  }
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  alert(msg);
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}
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// Test whether the input is numeric
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function IsNumeric(sText)
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{
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  var ValidChars = "0123456789.";
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  var IsNumber=true;
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  var Char;
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  for (i = 0; i &lt; sText.length &amp;&amp; IsNumber == true; i++) 
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  { 
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    Char = sText.charAt(i); 
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    if (ValidChars.indexOf(Char) == -1) 
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    {
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      IsNumber = false;
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    }
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  }
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  return IsNumber; 
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}</pre>
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</div>
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<div><h3>sensor-sample.js</h3>
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<pre class="codeblock" id="GUID-55D3CB19-580C-4F4F-9564-5D268A27A7A7">// sensor-sample.js
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//
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// In this sample the sensor will be found, get and set;
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// Also, async operation will be canceled.
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//
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// SAPI Error Codes
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// 0  - Success
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// 1000 - InvalidServiceArgument
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// 1001 - UnknownArgumentName
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// 1002 - BadArgumentType
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// 1003 - MissingArgument
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// 1004 - ServiceNotSupported
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// 1005 - ServiceInUse
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// 1006 - ServiceNotReady
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// 1007 - NoMemory
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// 1008 - HardwareNotAvailable
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// 1009 - ServerBusy
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// 1010 - EntryExists
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// 1011 - AccessDenied
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// 1012 - NotFound
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// 1013 - UnknownFormat
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// 1014 - GeneralError
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// 1015 - CancelSuccess
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// 1016 - ServiceTimedOut
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// 1017 - PathNotFound
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// Usage:
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// 1. Call FindSensorChannel (input searchCriterion) - this call obtains a list of maps.The list can be fetched using the key : ReturnValue
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// 2. From the list you need to fetch one ChannelInfo as a map.The fetching depends on how the runtime fetches items from an CLiwDefaultList.
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// 3. It is this ChannelInfo map that needs to be supplied to all the other APIs that follow.
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// Declare the service object
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var so;
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// imgid for callback1 function
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var imgid_callback1;
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// id of the div used to display information
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const DIV_ID = 'sensor';
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// transaction id
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var transactionID;
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// Called from onload()
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function setup()
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{
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  try {
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    so = device.getServiceObject("Service.Sensor", "ISensor");
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    console.info("setup: so: %s", so);
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  }
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  catch (e) {
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    alert('&lt;setup&gt; ' +e);
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  }
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}
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//FindSensorChannel - searches and list available sensor channels.
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function findSensorChannel(imgId)
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{
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  var criteria = new Object();
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  criteria.SearchCriterion = "Rotation";
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  try
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  {
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    var result = so.ISensor.FindSensorChannel(criteria);
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    if(!checkError("ISensor::findSensorChannel",result,DIV_ID,imgId)) {
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      document.getElementById(DIV_ID).innerHTML = showIterableList(result.ReturnValue);
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    }
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  }
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  catch (e)
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  {
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    showIMG(imgId,"no");
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    alert ("findSensorChannel: " + e);
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  }
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}
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// GetChannelProperty
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function getChannelProperty(imgId)
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{
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  var channelInfoMap = new Object();
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  channelInfoMap.ChannelId = 1;
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  channelInfoMap.ContextType = 0;  // 0-not defined; 1- to measure pressure, ...
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  channelInfoMap.Quantity = 0;
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  channelInfoMap.ChannelType = 0 ;
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  var criteria = new Object();
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  criteria.PropertyId = "Description";
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  criteria.ChannelInfoMap = channelInfoMap;
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  try
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  {
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    var result = so.ISensor.GetChannelProperty(criteria);
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    if(!checkError("ISensor::getChannelProperty",result,DIV_ID,imgId)) {
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      document.getElementById(DIV_ID).innerHTML = showIterableList(result.ReturnValue);
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    }
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  }
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  catch (e)
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  {
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    showIMG(imgId,"no");
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    alert ("getChannelProperty: " + e);
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  }
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}
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// RegisterForNotification - register to receive
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// notification about channel data.
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function registerForNotification(imgId)
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{
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  var channelInfoMap = new Object();
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  channelInfoMap.ChannelId = 1;
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  channelInfoMap.ContextType = 0;  // 0-not defined; 1- to measure pressure, ...
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  channelInfoMap.Quantity = 0;
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  channelInfoMap.ChannelType = 0 ;
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  var criteria = new Object();
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  criteria.ListeningType = "ChannelData";
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  criteria.ChannelInfoMap = channelInfoMap;
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  try
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  {
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    imgid_callback1 = imgId
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    var result = so.ISensor.RegisterForNotification(criteria, callback1);
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    transactionID = result.TransactionID;
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   288
    if(!checkError("ISensor::registerForNotification",result,DIV_ID,imgId)){
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      showIMG(imgId,"");
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   290
    }
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   291
  }
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  catch (e)
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   293
  {
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   294
    showIMG(imgId,"no");
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    alert ("registerForNotification: " + e);
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   296
  }
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   297
}
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//Cancel Notification
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function Cancel(imgId)
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{
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   302
  var criteria = new Object();
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  criteria.TransactionID = transactionID;
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   304
  try
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   305
  {
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   306
    var result = so.ISensor.Cancel(criteria);
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   307
    checkError("ISensor::Cancel",result,DIV_ID,imgId)
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   308
  }
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   309
  catch (e)
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   310
  {
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   311
    showIMG(imgId,"no");
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   312
    alert ("Cancel: " + e);
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   313
  }
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   314
}
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   315
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// This is the asynchronous callback handler
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   317
function callback1(transId, eventCode, result)
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   318
{
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  console.info("callback1: transId: %d  eventCode: %d result.ErrorCode: %d", transId, eventCode, result.ErrorCode);
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  if(!checkError("ISensor::registerForNotification",result,DIV_ID,imgid_callback1)) {
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    document.getElementById(DIV_ID).innerHTML = "Channel Property changes";
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  }
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}</pre>
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</div>
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</div></div></div><div class="footer"><hr/><div class="copy">© Nokia 2009.</div></div></body></html>