295 lines
8.3 KiB
HTML
295 lines
8.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Read Data from Session (QsnReadSsnDta) API</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- DSMMST1 SCRIPT A converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 29 Jan 1999 at 16:05:09 -->
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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<!--File Edited November 2001 -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="top_Of_Page"></a>
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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>Read Data from Session (QsnReadSsnDta) API</h2>
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<div class="box" style="width: 70%;">
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<br>
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Required Parameter Group:<br>
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<!-- iddvc RMBR -->
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<br>
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<table width="100%">
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<tr>
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<td align="center" valign="top" width="10%">1</td>
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<td align="left" valign="top" width="50%">Session handle</td>
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<td align="left" valign="top" width="20%">Input</td>
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<td align="left" valign="top" width="20%">Binary(4)</td>
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</tr>
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<tr>
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<td align="center" valign="top">2</td>
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<td align="left" valign="top">Input buffer handle</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Binary(4)</td>
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</tr>
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</table>
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<br>
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Omissible Parameter Group:<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center" valign="top" width="10%">3</td>
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<td align="left" valign="top" width="50%">Number of bytes read</td>
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<td align="left" valign="top" width="20%">Output</td>
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<td align="left" valign="top" width="20%">Binary(4)</td>
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</tr>
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<tr>
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<td align="center" valign="top">4</td>
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<td align="left" valign="top">Error code</td>
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<td align="left" valign="top">I/O</td>
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<td align="left" valign="top">Char(*)</td>
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</tr>
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</table>
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<br>
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Returned Value:<br>
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<!-- iddvc RMBR -->
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<br>
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<table width="100%">
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<tr>
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<td align="center" valign="top" width="10%"></td>
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<td align="left" valign="top" width="50%">Number of bytes read</td>
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<td align="left" valign="top" width="20%">Output</td>
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<td align="left" valign="top" width="20%">Binary(4)</td>
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</tr>
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</table>
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Service Program: QSNAPI<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: No<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The Read Data from Session (QsnReadSsnDta) API is used to read data
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from a session. A QsnReadInp operation is implicitly performed to read any
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field data. If the session has a DSM-defined input line, an implicit
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Clear Field Table (QsnClrFldTbl) operation is issued prior to redefining
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the session input line on each input operation. The data returned consists
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of only the data entered. That is, only the data from the cursor position
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within the field up to the last nonblank input character when an AID
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generating key is pressed is returned. If the session does not have a DSM-
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defined input line, data is read from any input fields defined on the
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screen, and all data, including blanks, is returned. In other respects,
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the processing of these user-defined input fields will be equivalent with
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the processing of the DSM-defined input line.</p>
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<p>If the previous input operation was a call to QsnReadSsnDtaCC, the session
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input line will be changed to support the data read by this API.</p>
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<p>If an AID key is pressed for which a corresponding function has been
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defined, this function will be called. Depending upon the return action
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specified, control would then return to the caller or another input
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operation
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will occur. See <a href="dsm3c.htm#HDRCMDKEY">Command Key Action
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Routines</a> for details.</p>
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<br>
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<h3>Restrictions</h3>
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<p>If the device supports CCSID-based I/O and the session was not defined
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with an input line and the application defines input fields on the screen,
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DSM is not able to determine if the fields are CCSID-capable or which
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CCSID they support. Since CCSID-based data requires special datastream
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commands, DSM could send invalid data to the device, or otherwise corrupt
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or misinterpret the input data. Because of this, the data read from any
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application defined input fields on the screen will not be echoed to the
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scroller. Also, the default command key exit routines will not use this
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data.</p>
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<br>
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<h3>Authorities and Locks</h3>
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<p>None</p>
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<br>
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<h3>Required Parameter Group</h3>
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<dl>
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<dt><strong>Session handle</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>A handle for the session from which to read input. The session being
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read
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from must be the current window. You can use the Set Current Window
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(QsnSetCurWin) API to change the current window.</p>
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</dd>
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<dt><strong>Input buffer handle</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>A handle for the input buffer to receive the result of the input
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operations
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if a direct operation is specified. The input buffer must have been
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created
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with the Create Input Buffer (QsnCrtInpBuf) API. The format of the data
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returned is the same as that of the Read Input Fields (QsnReadInp) API.</p
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>
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</dd>
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</dl>
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<br>
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<h3>Omissible Parameter Group</h3>
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<dl>
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<dt><strong>Number of bytes read</strong></dt>
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<dd>OUTPUT; BINARY(4)
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<p>The number of bytes of data read. On a successful read operation, this
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value
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is the same as that returned by the Retrieve Length of Field Data in
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Buffer
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(QsnRtvFldDtaLen) API if passed the input buffer resulting from this
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operation.</p>
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</dd>
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<dt><strong>Error code</strong></dt>
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<dd>I/O; CHAR(*)
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<p>The structure in which to return error information. For the format of
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the
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structure, see <a href="../apiref/error.htm#hdrerrcod">Error Code Parameter</a>. If
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this
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parameter is omitted, diagnostic and escape messages are issued to the
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application.</p>
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</dd>
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</dl>
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<br>
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<h3>Returned Value</h3>
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<dl>
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<dt><strong>Number of bytes read</strong></dt>
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<dd>OUTPUT; BINARY(4)
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<p>This API returns the value for the number of bytes read parameter if
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the
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operation was successful, -1 if there was a general failure, or -2 if the
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invite active flag is on in the associated environment and the read from
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invited device operation timed out.</p>
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</dd>
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</dl>
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<br>
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<h3>Error Messages</h3>
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<table width="100%" cellpadding="3">
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<!-- cols="15 85" -->
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td align="left" valign="top">CPF24B4 E</td>
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<td valign="top">Severe error while addressing parameter list.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF3CF1 E</td>
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<td valign="top">Error code parameter not valid.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF3CF2 E</td>
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<td valign="top">Error(s) occurred during running of &1 API.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA31E E</td>
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<td valign="top">Required parameter &1 omitted.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA343 E</td>
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<td valign="top">Output operation not done.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA344 E</td>
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<td valign="top">The file &2 in library &3 is not valid.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA345 E</td>
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<td valign="top">The invite active flag is not valid.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA3A4 E</td>
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<td valign="top">Specified window is not active.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA3D6 E</td>
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<td valign="top">Session handle is incorrect.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA3D9 E</td>
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<td valign="top">Error calling the command key action routine.</td>
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</tr>
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</table>
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<p>For examples of Read Data from Session APIs, see <a href=
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"dsm3d.htm#HDRSSEX">Example: Create Session and Read Data</a>.</p>
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<hr>
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API Introduced: V2R3
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a
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href=
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"dsm.htm">Dynamic Screen Manager APIs</a> | <a href="aplist.htm">APIs by
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category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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