| author | Eugene Ostroukhov <eugeneo@symbian.org> |
| Mon, 15 Mar 2010 17:56:08 -0700 | |
| changeset 268 | ef733cd772bb |
| parent 229 | 716254ccbcc0 |
| permissions | -rw-r--r-- |
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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="ILocation.Trace()"/><meta name="DC.Relation" scheme="URI" content="GUID-DBEE8177-7246-4FEE-A0F1-D6AEEA6EA206"/><meta name="DC.Relation" scheme="URI" content="GUID-150E440F-56E4-4249-8739-A5A7A2050600"/><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-53CE4DE6-F065-4339-8C18-5C30A9540053"/><meta name="DC.Format" content="XHTML"/><meta name="DC.Identifier" content="GUID-7A0190CB-545E-48D2-BAF0-D28E03CDFCA5"/><title>ILocation.Trace() </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-7A0190CB-545E-48D2-BAF0-D28E03CDFCA5"><span>ILocation.</span>Trace()</h1><div> |
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<p><strong>Description:</strong></p> |
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<p>The <code>Trace</code> method retrieves periodic updates about |
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the current location of the device based on a predefined update interval.</p> |
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<p>This is an asynchronous method.</p> |
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<p><strong>Syntax:</strong></p> |
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<pre class="codeblock" id="GUID-676491ED-F5F1-4B9C-887C-EB50FE523F99">result = so.ILocation.Trace(criteria, callback);</pre> |
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<p><strong>Arguments:</strong></p> |
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<ul> |
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<li><p><code>criteria</code>:</p> |
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<p>This is an object that specifies what type of device location information |
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is returned and how. For more information about the object properties and |
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how to define them, see section <a href="GUID-4541E532-CC1A-4115-8467-7FA1C4378307.html#GUID-4541E532-CC1A-4115-8467-7FA1C4378307">Criteria for retrieving location information</a>.</p> |
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</li> |
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<li><p><code>callback</code>:</p> |
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<p>The <code>callback</code> argument is the name of the method |
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that is executed when <code>Trace</code> has results or status information |
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to return. You must define this method separately. Follow the instructions |
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in section <a href="GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608.html#GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608">Defining the callback handler for an asynchronous method</a> to |
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define the <code>callback</code> method.</p> |
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</li> |
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</ul> |
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<p><strong>Return value:</strong></p> |
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<p>The <code>Trace</code> method returns an object that contains |
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the initial return value for the asynchronous call it started (see the following |
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table). The actual location information is returned by the <a href="GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608.html#GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608"><code>callback</code></a> method in the <code>ReturnValue</code> property of its result object. |
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The returned information is described in section <a href="GUID-A6C9AF19-6694-478B-A9FE-7898A2091C4B.html#GUID-A6C9AF19-6694-478B-A9FE-7898A2091C4B">Returned location information</a>.</p> |
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<div class="tablenoborder"><a name="GUID-F2F7057D-0C4F-4837-9567-ACA408CEA101"><!----></a><table cellpadding="4" cellspacing="0" summary="" id="GUID-F2F7057D-0C4F-4837-9567-ACA408CEA101" frame="border" border="1" rules="all"><caption><strong>Table: </strong>Return value |
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properties for Trace</caption> |
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<thead align="left"> |
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<tr class="title "><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e48640"> |
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<p>Property</p> |
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</th><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e48645"> |
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<p>Description</p> |
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</th><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e48650"> |
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<p>Value</p> |
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</th></tr> |
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</thead> |
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<tbody> |
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<tr class=""> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48640 "> |
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<p><code>result.TransactionID</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48645 "> |
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<p>This is a number used as an identification to match transactions started |
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with the <code>Trace</code> call to one or more calls it generates |
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to <code>callback</code>.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48650 "> </td> |
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</tr> |
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<tr class="bg "> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48640 "> |
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<p><code>result.ErrorCode</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48645 "> |
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<p>This is a number that specifies a predefined error code.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48650 "> |
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<p>See <a href="GUID-0A215AF3-59F0-4158-842C-0D7B030E5EA4.html#GUID-0A215AF3-59F0-4158-842C-0D7B030E5EA4">Service API error codes</a>.</p> |
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</td> |
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</tr> |
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<tr class=""> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48640 "> |
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<p><code>result.ErrorMessage</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48645 "> |
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<p>This is a text string that describes the error.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e48650 "> |
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<p>See <a href="GUID-DEA4164E-5F03-4B57-97B9-4C6238481F89.html#GUID-DEA4164E-5F03-4B57-97B9-4C6238481F89">Location Service API error messages</a>.</p> |
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</td> |
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</tr> |
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</tbody> |
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</table></div> |
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<p><strong>Remarks:</strong></p> |
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<ul> |
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<li><p><code>Trace</code> retrieves location updates until |
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cancelled with <a href="GUID-7A466B60-88DD-4A3A-B64C-E7300D42DA56.html#GUID-7A466B60-88DD-4A3A-B64C-E7300D42DA56"><code>CancelNotification</code></a>. |
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You can therefore have only one <code>Trace</code> call (one instance) |
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pending or in use at any given time.</p></li> |
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<li><p>The availability of specific location information depends |
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on the underlying GPS technology. Other factors, such as the number of satellites |
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available for a location fix, also affect what information can be returned. |
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You can change the positioning system used by an S60 device from the <strong>Settings |
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> General > Positioning > Positioning methods</strong> menu.</p></li> |
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<li><p>It takes time to retrieve the initial position fix. Subsequent |
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requests are faster.</p></li> |
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</ul> |
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<p><strong>Example code:</strong></p> |
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<p/> |
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<p>For the complete source of a sample widget |
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that demonstrates how to use this Service API, see <a href="GUID-620340F8-F844-445E-80AA-71C757320B7E.html#GUID-620340F8-F844-445E-80AA-71C757320B7E">the |
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full example</a>.</p> |
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</div></div></div><div class="footer"><hr/><div class="copy">© Nokia 2009.</div></div></body></html> |