67 lines
4.1 KiB
HTML
67 lines
4.1 KiB
HTML
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<meta name="DC.Title" content="Keyed interface" />
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<meta name="abstract" content="Some APIs have a keyed interface for selecting what information you want returned. A keyed interface allows the user of the API to provide information to the API through the use of keys." />
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<title>Keyed interface</title>
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<body id="receiverkeyed"><a name="receiverkeyed"><!-- --></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">Keyed interface</h1>
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<div><p>Some APIs have a keyed interface for selecting what information
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you want returned. A <em>keyed interface</em> allows the user of the API to
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provide information to the API through the use of keys.</p>
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<div class="section"><p>Keys are API-specific values that inform the API
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that a certain function should be performed. Keys also are used to pass information
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to an API or to retrieve information from an API.</p>
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<p>Through the use of
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keys, you can be more selective; you can choose one item or a number of items
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rather than all of them. For example, using the List Job (QUSLJOB) API, you
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can receive selected information about a job based on the keys that you specify.
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If you want job information about the output queue priority, you only need
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to specify the output queue priority key.</p>
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<p>The keys are typically supplied
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to an API and are passed to the API using a variable-length record (there
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are some exceptions). A <em>variable-length record</em> is a collection of information
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that specifies the key being used and the data that is associated with the
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key. If a given structure contains binary values, it must be 4-byte aligned. </p>
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<p>Some
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APIs that use variable-length records in addition to the List Job API are
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the Change Object Description (QLICOBJD) API and the Register Exit Point (QUSRGPT,
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QusRegisterExitPoint) API. You can use the appropriate include file in member
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QUS in the system include (QSYSINC) library when you have variable-length
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records as either input or output.</p>
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<p>A keyed interface provides an easy-to-use
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means for later enhancing an API without affecting the user who chooses not
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to use the enhancements. For examples that use a keyed interface, see Example:
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Using keys with List Spooled Files API and Example: Keyed interface using
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ILE APIs.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="conReceiver.htm" title="A receiver variable is a program variable that is used as an output field to contain information that is returned from an API.">Receiver variables</a></div>
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</div>
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