org.symbian.tools.wrttools.doc.WebDeveloper/html/GUID-6FBE64B7-0949-4AAE-B835-52B276540A59.html
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/org.symbian.tools.wrttools.doc.WebDeveloper/html/GUID-6FBE64B7-0949-4AAE-B835-52B276540A59.html Fri Mar 05 19:11:15 2010 -0800
@@ -0,0 +1,95 @@
+
+<!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" 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="Accessing data from the physical sensors of a device"/><meta name="DC.Relation" scheme="URI" content="GUID-E0ED671A-BBDA-4C07-828F-BD35782D9B36"/><meta name="DC.Relation" scheme="URI" content="GUID-2240F5BE-97BD-4CB3-8DB3-B5CF7C23BF54"/><meta name="DC.Relation" scheme="URI" content="GUID-1EFD7043-E9B8-4B4E-9EA6-A20B3EECC14A"/><meta name="DC.Relation" scheme="URI" content="GUID-46EABDC1-37CB-412A-ACAD-1A1A9466BB68"/><meta name="DC.Format" content="XHTML"/><meta name="DC.Identifier" content="GUID-6FBE64B7-0949-4AAE-B835-52B276540A59"/><title>Accessing
+data from the physical sensors of a device </title><script type="text/javascript">
+ function initPage() {}
+ </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-6FBE64B7-0949-4AAE-B835-52B276540A59">Accessing
+data from the physical sensors of a device</h1><div>
+<p>The <a href="GUID-B77C2006-879F-4AC6-B7BF-04B25B563A29.html#GUID-B77C2006-879F-4AC6-B7BF-04B25B563A29">Sensor Service
+API</a> allows <span>widgets</span> to access data provided by the
+physical sensors of a device. The data from a given sensor is mapped to one
+or more sensor channels, which the API can listen to. The available sensors
+depend on the device. You can use the Sensor Service to create <span>widgets</span> that:</p>
+<ul>
+<li><p>Search for sensor channels available on a device</p></li>
+<li><p>Listen for data provided by one or more sensor channels</p>
+</li>
+<li><p>Retrieve information about sensor channel properties</p>
+</li>
+</ul>
+<p>Sensor information involves the following concepts:</p>
+<ul>
+<li><p><strong>Sensor</strong> is a physical sensor on a device (a piece of
+hardware combined with a software plugin). A single sensor can provide multiple
+sensor channels, such as a raw data channel and event channels, or incorporate
+multiple sensor readings into a single sensor channel.</p></li>
+<li><p><strong>Sensor property</strong> is a configuration value of a sensor.
+The property affects all sensor channels that draw data from the sensor.</p>
+</li>
+<li><p><strong>Channel</strong> is an abstraction of a physical sensor. Data
+from one physical sensor can be mapped to multiple sensor channels.</p>
+</li>
+<li><p><strong>Channel property</strong> is a configuration value of a sensor
+channel. The property affects all clients listening to the channel.</p>
+</li>
+</ul>
+<div><h3>Accessing the API and supported methods</h3>
+<p>To create a <a href="GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080.html#GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080">service
+object</a> for the Sensor Service API, use <code>Service.Sensor</code> to
+identify the service provider and <code>ISensor</code> to identify
+the supported interface:</p>
+
+<pre class="codeblock" id="GUID-99272E68-27D3-4FBC-BB40-177578454568">var so = device.getServiceObject("Service.Sensor", "ISensor");</pre>
+<p>The <code>ISensor</code> interface provides the following methods:</p>
+<ul>
+<li><p><a href="GUID-46DB749E-A388-46B2-BB13-A274385CA97C.html#GUID-46DB749E-A388-46B2-BB13-A274385CA97C"><code>FindSensorChannel()</code></a></p>
+
+<p>Use the <code>FindSensorChannel()</code> method to search for
+sensor channels available on the device.</p>
+
+</li>
+<li><p><a href="GUID-B4897257-F7BC-4C32-9C6C-A577FDAC5D09.html#GUID-B4897257-F7BC-4C32-9C6C-A577FDAC5D09"><code>RegisterForNotification()</code></a></p>
+
+<p>Use the <code>RegisterForNotification()</code> method to receive
+data from one sensor channel.</p>
+
+</li>
+<li><p><a href="GUID-3A306F4B-638D-4133-8575-2E269E565B7F.html#GUID-3A306F4B-638D-4133-8575-2E269E565B7F"><code>Cancel()</code></a></p>
+
+<p>Use the <code>Cancel()</code> method to stop receiving data
+provided by a <code>RegisterForNotification()</code> call.</p>
+
+</li>
+<li><p><a href="GUID-C2731B38-6294-419C-B7E2-AFB918F508D4.html#GUID-C2731B38-6294-419C-B7E2-AFB918F508D4"><code>GetChannelProperty()</code></a></p>
+
+<p>Use the <code>GetChannelProperty()</code> method to retrieve
+information about a sensor channel property.</p>
+
+</li>
+</ul>
+</div>
+<div><h3>Using the service in a widget</h3>
+<p>To access sensor data on a device using the Sensor Service API:</p>
+<ol>
+<li id="GUID-E8ECDB2F-00C4-488F-A253-87FABDA66CA6-GENIDd0e8963"><a name="GUID-E8ECDB2F-00C4-488F-A253-87FABDA66CA6-GENIDd0e8963"><!----></a><p>Create a service
+object for the API using <a href="GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080.html#GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080"><code>device.getServiceObject()</code></a>.</p>
+</li>
+<li id="GUID-0625B45D-A5C9-4ADA-BC21-07963F957A7C-GENIDd0e8972"><a name="GUID-0625B45D-A5C9-4ADA-BC21-07963F957A7C-GENIDd0e8972"><!----></a><p>Define the
+tasks you want to perform and choose the correct methods for them.</p>
+</li>
+<li id="GUID-DBD9997B-CD51-45F9-9ED0-38A98AF08A12-GENIDd0e8977"><a name="GUID-DBD9997B-CD51-45F9-9ED0-38A98AF08A12-GENIDd0e8977"><!----></a><p>Optionally,
+define how you want the results filtered.</p></li>
+<li id="GUID-AAB5C193-F848-4B0A-AF03-6BA7425BD10B-GENIDd0e8981"><a name="GUID-AAB5C193-F848-4B0A-AF03-6BA7425BD10B-GENIDd0e8981"><!----></a><p>Define methods
+to process the results.</p></li>
+<li id="GUID-F0C3D20F-6F77-4C88-AF35-39DA70DE701B-GENIDd0e8985"><a name="GUID-F0C3D20F-6F77-4C88-AF35-39DA70DE701B-GENIDd0e8985"><!----></a><p>Retrieve the
+results using the methods from step 2. Use asynchronous methods together with <a href="GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608.html#GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608"><code>callback()</code></a>.</p>
+</li>
+<li id="GUID-0ABE0CB0-D76C-444B-AE53-0D435B3C6E74-GENIDd0e8994"><a name="GUID-0ABE0CB0-D76C-444B-AE53-0D435B3C6E74-GENIDd0e8994"><!----></a><p>Process the
+results using the methods defined in step 4.</p></li>
+</ol>
+<p>For the complete source of a sample widget that demonstrates how to
+use this service, see <a href="GUID-350F3C29-923E-4C30-8B14-C3D594BB8E39.html#GUID-350F3C29-923E-4C30-8B14-C3D594BB8E39">the
+full example</a>.</p>
+</div>
+</div></div></div><div class="footer"><hr/><div class="copy">© Nokia 2009.</div></div></body></html>
\ No newline at end of file