114 lines
9.1 KiB
HTML
114 lines
9.1 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Listing Print objects" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Listing Print objects</title>
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</head>
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<body id="printli"><a name="printli"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Listing Print objects</h1>
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<div><p></p>
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<div class="section"><p>You can use the <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#NAVBAR_TOP"> PrintObjectList</a> class and its subclasses to work with
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lists of print objects. Each subclass has methods that allow filtering of
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the list based on what makes sense for that particular type of print object.
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For example, <a href="javadoc/com/ibm/as400/access/SpooledFileList.html#NAVBAR_TOP"> SpooledFileList</a> allows you to filter a list of spooled
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files based on the user who created the spooled files, the output queue that
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the spooled files are on, the form type, or user data of the spooled files.
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Only those spooled files that match the filter criteria are listed. If no
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filters are set, a default for each of the filters are used.</p>
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<p>To actually
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retrieve the list of print objects from the server, the <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#OPENSYNCHRONOUSLY()"> openSynchronously()</a> or <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#OPENASYNCHRONOUSLY()"> openAsynchronously()</a> methods are used. The openSynchronously()
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method does not return until all objects in the list have been retrieved from
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the server. The openAsynchronously() method returns immediately, and the caller
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can do other things in the foreground while waiting for the list to build.
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The asynchronously opened list also allows the caller to start displaying
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the objects to the user as the objects come back. Because the user can see
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the objects as they come back, the response time may seem faster to the user.
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In fact, the response time may actually take longer overall due to the extra
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processing being done on each object in the list.</p>
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<p>If the list is opened
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asynchronously, the caller may get feedback on the building of the list. Methods,
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such as <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#ISCOMPLETED()"> isCompleted()</a> and <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#SIZE()"> size()</a>, indicate whether the list has finished being
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built or return the current size of the list. Other methods, <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#WAITFORLISTTOCOMPLETE()"> waitForListToComplete()</a> and <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#WAITFORITEM(INT)"> waitForItem()</a>, allow the caller to wait for the list
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to complete or for a particular item. In addition to calling these PrintObjectList
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methods, the caller may register with the list as a listener. In this situation,
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the caller is notified of events that happen to the list. To register or unregister
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for the events, the caller uses <a href="javadoc/com/ibm/as400/access/PrintObjectListListener.html"> PrintObjectListListener()</a>, and then calls <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#ADDPRINTOBJECTLISTLISTENER(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTLISTENER)"> addPrintObjectListListener()</a> to register or <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#REMOVEPRINTOBJECTLISTLISTENER(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTLISTENER)"> removePrintObjectListListener()</a> to unregister. The following
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table shows the events that are delivered from a PrintObjectList.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><thead align="left"><tr class="tablemainheaderbar"><th valign="top" width="25.925925925925924%" id="d0e57">PrintObjectList event</th>
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<th valign="top" width="74.07407407407408%" id="d0e59">When event is delivered</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="25.925925925925924%" headers="d0e57 "><a href="javadoc/com/ibm/as400/access/PrintObjectListListener.html#LISTCLOSED(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTEVENT)"> listClosed</a></td>
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<td valign="top" width="74.07407407407408%" headers="d0e59 ">When the list is closed.</td>
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</tr>
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<tr><td valign="top" width="25.925925925925924%" headers="d0e57 "><a href="javadoc/com/ibm/as400/access/PrintObjectListListener.html#LISTCOMPLETED(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTEVENT)"> listCompleted</a></td>
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<td valign="top" width="74.07407407407408%" headers="d0e59 ">When the list completes.</td>
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</tr>
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<tr><td valign="top" width="25.925925925925924%" headers="d0e57 "><a href="javadoc/com/ibm/as400/access/PrintObjectListListener.html#LISTERROROCCURRED(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTEVENT)"> listErrorOccurred</a></td>
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<td valign="top" width="74.07407407407408%" headers="d0e59 ">If any exception is thrown while the list is being retrieved.</td>
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</tr>
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<tr><td valign="top" width="25.925925925925924%" headers="d0e57 "><a href="javadoc/com/ibm/as400/access/PrintObjectListListener.html#LISTOPENED(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTEVENT)"> listOpened</a></td>
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<td valign="top" width="74.07407407407408%" headers="d0e59 ">When the list is opened.</td>
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</tr>
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<tr><td valign="top" width="25.925925925925924%" headers="d0e57 "><a href="javadoc/com/ibm/as400/access/PrintObjectListListener.html#LISTOBJECTADDED(COM.IBM.AS400.ACCESS.PRINTOBJECTLISTEVENT)"> listObjectAdded</a></td>
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<td valign="top" width="74.07407407407408%" headers="d0e59 ">When an object is added to the list.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>After the list has been opened and the objects in the list processed,
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close the list using the <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#CLOSE()"> close()</a> method. This frees up any resources allocated
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to the garbage collector during the open. After a list has been closed, its
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filters can be modified, and the list can be opened again.</p>
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<p>When print
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objects are listed, attributes about each print object listed are sent from
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the server and stored with the print object. These attributes can be updated
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using the <a href="javadoc/com/ibm/as400/access/PrintObject.html#UPDATE()"> update()</a> method in the PrintObject class. Which attributes
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are sent back from the server depends on the type of print object being listed.
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A default list of attributes for each type of print object that can be overridden
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by using the <a href="javadoc/com/ibm/as400/access/PrintObjectList.html#SETATTRIBUTESTORETRIEVE(INT[])"> setAttributesToRetrieve()</a> method in PrintObjectList
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exists. See the <a href="printatt.htm#printatt">Retrieving PrintObject
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attributes</a> section for a list of the attributes each type of print
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object supports.</p>
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<p>Listing AFP™ Resources is allowed only on Version
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3 Release 7 and later releases of i5/OS™. Opening an <a href="javadoc/com/ibm/as400/access/AFPResourceList.html"> AFPResourceList</a> to an system older than V3R7 generates
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a <a href="javadoc/com/ibm/as400/access/RequestNotSupportedException.html"> RequestNotSupportedException</a> exception.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Examples</h4><p>The following examples show different ways
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to list spooled files.</p>
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<blockquote><p><a href="npexamplelistsplfasynch.htm#npexamplelistsplfasynch">Example: Listing spooled files asynchronously (using listeners)</a> shows
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how to asynchronously list all spooled files on a system and how to use the
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PrintObjectListListener interface to get feedback as the list is being built</p>
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<p><a href="npexamplelistsplfasynch2.htm#npexamplelistsplfasynch2">Example: Listing spooled files asynchronously (without using listeners)</a> shows
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how to asynchronously list all spooled files on a system <em>without</em> using
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the PrintObjectListListener interface</p>
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<p><a href="npexamplelistsplfsynch.htm#npexamplelistsplfsynch">Example: Listing spooled files synchronously</a>
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shows how to synchronously list all spooled files on a system</p>
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</blockquote>
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</div>
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</div>
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</body>
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</html> |