91 lines
5.2 KiB
HTML
91 lines
5.2 KiB
HTML
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<title>cwbDQ_AsyncRead</title>
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</head>
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<body id="cwbdq_asyncread"><a name="cwbdq_asyncread"><!-- --></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"><span class="apiname">cwbDQ_AsyncRead</span></h1>
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<div><div class="section"><h4 class="sectiontitle">Purpose</h4><p>Read a record from the iSeries™ data
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queue object that is identified by the specified handle. The <span class="apiname">AsyncRead</span> will
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return control to the caller immediately. This call is used in conjunction
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with the <span class="apiname">CheckData</span> API. When a record is read from a data
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queue, it is removed from the data queue. If the data queue is empty for more
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than the specified wait time, the read is aborted, and the <span class="apiname">CheckData</span> API
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returns a value of CWBDQ_TIMED_OUT. You may specifying a wait time from 0
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to 99,999 (in seconds) or forever (-1). A wait time of zero causes the <span class="apiname">CheckData</span> API
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to return a value of CWBDQ_TIMED_OUT on its initial call if there is no data
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in the data queue.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Syntax</h4><pre>
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unsigned int CWB_ENTRY cwbDQ_AsyncRead(
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cwbDQ_QueueHandle queueHandle,
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cwbDQ_Data data,
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signed long waitTime,
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cwbDQ_ReadHandle *readHandle,
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cwbSV_ErrHandle errorHandle);</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Parameters</h4><dl><dt class="dlterm">cwbDQ_QueueHandle queueHandle - input</dt>
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<dd>Handle that was returned by a previous call to the <span class="apiname">cwbDQ_Open</span> function.
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This identifies the iSeries data queue object.</dd>
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<dt class="dlterm">cwbDQ_Data data - input</dt>
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<dd>The data object to be read from the iSeries data queue.</dd>
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<dt class="dlterm">signed long waitTime - input</dt>
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<dd>Length of time in seconds to wait for data, if the data queue is empty.
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A wait time of -1 indicates to wait forever.</dd>
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<dt class="dlterm">cwbDQ_ReadHandle * readHandle - output</dt>
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<dd>Pointer to where the <span class="apiname">cwbDQ_ReadHandle</span> will be written.
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This handle will be used in subsequent calls to the <span class="apiname">cwbDQ_CheckData</span> API.</dd>
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<dt class="dlterm">cwbSV_ErrHandle errorHandle - output</dt>
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<dd>Any returned messages will be written to this object. It is created with
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the <span class="apiname">cwbSV_CreateErrHandle</span> API. The messages may be retrieved
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through the <span class="apiname">cwbSV_GetErrText</span> API. If the parameter is set
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to zero, no messages will be retrieved.</dd>
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</dl>
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</div>
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<div class="section"><h4 class="sectiontitle">Return Codes</h4><p>The following list shows common return
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values.</p>
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<dl><dt class="dlterm">CWB_OK</dt>
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<dd>Successful completion.</dd>
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<dt class="dlterm">CWBDQ_INVALID_TIME</dt>
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<dd>Invalid wait time.</dd>
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<dt class="dlterm">CWBDQ_INVALID_QUEUE_HANDLE</dt>
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<dd>Invalid queue handle.</dd>
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<dt class="dlterm">CWBDQ_INVALID_SEARCH</dt>
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<dd>Invalid search order.</dd>
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</dl>
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</div>
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<div class="section"><h4 class="sectiontitle">Usage</h4><p>This function requires that you have previously
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issued the following APIs: </p>
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<ul><li><span class="apiname">cwbDQ_Open</span> or <span class="apiname">cwbDQ_OpenEx</span></li>
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<li><span class="apiname">cwbDQ_CreateData</span></li>
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</ul>
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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="rzaikdqapilist2.htm" title="After the cwbDQ_Open API is used to create a connection to a specific data queue, these other APIs can be used to utilize it. Use the cwbDQ_Close API when the connection no longer is needed.">Data Queues: Accessing data queues APIs</a></div>
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</div>
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</div>
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</body>
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</html>
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