363 lines
9.9 KiB
HTML
363 lines
9.9 KiB
HTML
<!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 Modified Alternate (QsnReadMDTAlt) 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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<!-- 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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<!--File Edited October 2001 -->
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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 Modified Alternate (QsnReadMDTAlt) 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%">Control character byte 1</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%">Char(1)</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">Control character byte 1</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(1)</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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<!-- 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%">3</td>
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<td align="left" valign="top" width="50%">Field count</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">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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<tr>
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<td align="center" valign="top">5</td>
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<td align="left" valign="top">Command 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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<tr>
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<td align="center" valign="top">6</td>
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<td align="left" valign="top">Low-level environment 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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<tr>
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<td align="center" valign="top">7</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%">Field count</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 Modified Alternate (QsnReadMDTAlt) API reads the contents of all
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modified fields on the screen, alternate form, requiring an AID-generating key
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to be pressed. The QsnReadMDTAlt API is functionally equivalent to the
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QsnReadMDT API with the following exceptions:</p>
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<ul>
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<li>Leading and embedded nulls within the fields remain nulls. However,
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trailing nulls are stripped off.</li>
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<li>For fields consisting entirely of nulls, but with their MDT bit on, only
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the field's address is returned.</li>
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</ul>
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<p>See <a href="QsnReadMDT.htm">Read Modified Fields (QsnReadMDT) API</a> for
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details.</p>
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<p>This command corresponds directly to the 5250 Read MDT Alternate
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command.</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>Restrictions</h3>
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<p>This command is not supported by all control units. A CPFA306 error occurs
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if an attempt is made to issue this command to a control unit that does not
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support it.</p>
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<p>Some control units, like those emulated by the Client Access program, do not
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support a control character associated with input commands. For such units, the
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control character specified would be ignored. A program could cause further
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actions to be suspended if, for example, the control character byte 2 specified
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to unlock the keyboard and this action was not specified elsewhere in the data
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stream. If the underlying control unit does not support a control character
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with input commands, you must specify the action to perform using the QsnWTD
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API.</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>Control character byte 1</strong></dt>
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<dd>INPUT; CHAR(1)
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<p>The operation for the display to perform after the read operation has been
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serviced. See <a href="dsm1e.htm#HDRCC">Control Characters</a> for a
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description of the control character values.</p>
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</dd>
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<dt><strong>Control character byte 2</strong></dt>
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<dd>INPUT; CHAR(1)
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<p>The operation for the display to perform after the read operation and
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control character byte 1 have been serviced. See <a href="dsm1e.htm#HDRCC">
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Control Characters</a> for a description of the control character values.</p>
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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>Field count</strong></dt>
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<dd>OUTPUT; BINARY(4)
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<p>The variable that will contain the number of input fields read after the
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QsnReadMDTAlt API has completed, if a direct operation is specified. The
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parameter is not modified for an indirect operation and the value remains
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unchanged from whatever was passed.</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 that receives the result of the input
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operation if a direct operation is specified. The result can be queried using
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the input buffer query operations. See <a href="QsnRtvFldDta.htm">Retrieve
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Pointer to Field Data (QsnRtvFldDta) API</a> and <a href="QsnRtvFldDtaLen.htm">
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Retrieve Length of Field Data in Buffer (QsnRtvFldDtaLen) API</a>.</p>
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</dd>
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<dt><strong>Command buffer handle</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>A handle for the command buffer in which to store the command.</p>
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</dd>
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<dt><strong>Low-level environment handle</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>The low-level environment that the operation applies to. If this parameter
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is omitted or given with a value of zero, the default low-level environment is
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used.</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 the
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structure, see <a href="../apiref/error.htm#hdrerrcod">Error Code Parameter</a>. If 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>Field count</strong></dt>
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<dd>OUTPUT; BINARY(4)
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<p>Returns the value for the field count parameter if a direct operation was
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specified or -1 if an error occurs during processing. If this is an indirect
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operation, returns zero if successful, or -1 otherwise.</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">CPFA301 E</td>
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<td valign="top">Command buffer is full.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA302 E</td>
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<td valign="top">Command buffer or input buffer parameters required.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA304 E</td>
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<td valign="top">Data-stream error &1 reported for screen I/O
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operation.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA305 E</td>
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<td valign="top">Cannot add operation to command buffer.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA306 E</td>
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<td valign="top">Command not supported by current device.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA309 E</td>
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<td valign="top">Invalid cursor position in command buffer.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA313 E</td>
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<td valign="top">Command buffer already contains an input operation.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA31C E</td>
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<td valign="top">Incorrect value for control character byte &1.</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">CPFA326 E</td>
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<td valign="top">Screen must be redrawn.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA331 E</td>
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<td valign="top">Buffer handle incorrect.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA334 E</td>
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<td valign="top">Low level environment handle incorrect.</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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</table>
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<br>
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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 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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