| author | Eugene Ostroukhov <eugeneo@symbian.org> |
| Wed, 26 May 2010 17:01:34 -0700 | |
| changeset 341 | 480716493610 |
| 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="Defining the callback handler for an asynchronous method"/><meta name="DC.Relation" scheme="URI" content="GUID-E9A578AA-58C5-4902-B418-4CE44EA40D5D"/><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-C7C3B541-8D28-4DC6-9003-ECF57F26C608"/><title>Defining |
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the callback handler for an asynchronous method </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-C7C3B541-8D28-4DC6-9003-ECF57F26C608">Defining |
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the callback handler for an asynchronous method</h1><div> |
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<p>The callback handler method is used with an asynchronous method call |
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to retrieve the information requested by the call. The asynchronous call initiates |
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the callback handler and then returns a <code>TransactionID</code>. |
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This ID is used to map the asynchronous call to the correct callback handler |
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instance and the result information it returns. You can call the result handler |
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method from within the callback handler.</p> |
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<p>Define a callback handler method for any <a href="GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C.html#GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C">Service |
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API</a> method that is called asynchronously. Use the following method |
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signature:</p> |
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<pre class="codeblock" id="GUID-A044965C-8E27-42AA-B7FE-F2F025955FB9">callback(transId, eventCode, result)</pre> |
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<p>The system supplies the expected arguments:</p> |
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<div class="tablenoborder"><a name="GUID-C0E6D8A6-2C30-4D8A-9572-5CF593A43C52"><!----></a><table cellpadding="4" cellspacing="0" summary="" id="GUID-C0E6D8A6-2C30-4D8A-9572-5CF593A43C52" frame="border" border="1" rules="all"><caption><strong>Table: </strong>Callback arguments</caption> |
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<thead align="left"> |
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<tr class="title "><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e9121"> |
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<p>Argument</p> |
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</th><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e9126"> |
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<p>Description</p> |
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</th><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e9131"> |
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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="d0e9121 "> |
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<p><code>transId</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9126 "> |
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<p>This is a number representing the transaction that called the callback |
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handler.</p> |
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<p><code>TransactionID</code> was returned as part of the result |
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of the initial asynchronous call.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9131 "> </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="d0e9121 "> |
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<p><code>eventCode</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9126 "> |
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<p>This is a number representing the callback return status.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9131 "> |
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<p><strong>Value - Description:</strong></p> |
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<p><code>2</code> - Event completed</p> |
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<p><code>4</code> - Event error</p> |
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<p><code>9</code> - Event in progress</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="d0e9121 "> |
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<p><code>result</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9126 "> |
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<p>This is an object for holding the callback return value.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9131 "> |
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<p>See the following table.</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>The callback handler returns an object that contains the requested information, |
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an error code, and an error message:</p> |
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<div class="tablenoborder"><a name="GUID-E43BC9EA-3EBE-4C7F-A57E-A1C33BB01CF4"><!----></a><table cellpadding="4" cellspacing="0" summary="" id="GUID-E43BC9EA-3EBE-4C7F-A57E-A1C33BB01CF4" frame="border" border="1" rules="all"><caption><strong>Table: </strong>Callback return |
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value</caption> |
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<thead align="left"> |
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<tr class="title "><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e9242"> |
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<p>Property</p> |
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</th><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e9247"> |
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<p>Description</p> |
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</th><th class="cellrowborder" valign="top" width="33.33333333333333%" id="d0e9252"> |
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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="d0e9242 "> |
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<p><code>[result.ReturnValue]</code></p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9247 "> |
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<p>This contains the information requested by the asynchronous call that |
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initiated the callback handler.</p> |
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<p>If an asynchronous call does not request any information to be returned, |
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this property is not included in the callback return value. In this case, |
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the callback handler only returns <code>ErrorCode</code> and <code>ErrorMessage</code>.</p> |
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</td> |
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="d0e9252 "> |
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<p>Depends on the <a href="GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C.html#GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C">Service |
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API</a> and the asynchronous method that was called. Not all calls return |
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this property. See the appropriate method definition.</p> |
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</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="d0e9242 "> |
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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="d0e9247 "> |
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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="d0e9252 "> |
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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="d0e9242 "> |
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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="d0e9247 "> |
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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="d0e9252 "> |
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<p>Depends on the <a href="GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C.html#GUID-65AAF569-D347-462B-B59A-9D7CA184AB9C">Service |
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API</a> and the asynchronous method that was called. See the appropriate |
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method definition.</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/> |
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</div></div></div><div class="footer"><hr/><div class="copy">© Nokia 2009.</div></div></body></html> |