332 lines
9.6 KiB
HTML
332 lines
9.6 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>Write to Display (QsnWTD) API</title>
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</head>
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<body>
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<a name="top_Of_Page"></a>
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>Write to Display (QsnWTD) 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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<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 2</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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<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%">Command buffer 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">4</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">5</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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<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%">Return code</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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<br>
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Service Program: QSNAPI<br>
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<br>
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Threadsafe: No<br>
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<br>
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</div>
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<p>The Write to Display (QsnWTD) API issues a Write to Display (WTD) command. A
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WTD command is used to indicate the beginning of a series of output operations.
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For most of the DSM screen output operations, the control unit requires that a
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WTD be issued prior to the actual operation itself, in the same I/O operation.
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Multiple output operations can be sent with a given WTD command by using a
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command buffer. For direct operations, such output APIs, implicitly issue a WTD
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command. For indirect operations, a WTD is added to the buffer if one does not
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exist already. Each time a WTD command is received, the control unit implicitly
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sets the display address to row 1, column 1, prior to issuing the
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operation.</p>
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<p>For example, if two direct QsnWrtDta operations are performed in succession
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and the second operation does not specify the row and column parameters, the
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data is written to row 1, column 1, and not the display address following the
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first QsnWrtDta operation. If two indirect QsnWrtDta operations are issued to
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an empty command buffer, the first QsnWrtDta operation causes a WTD command to
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be added to the buffer, but the second QsnWrtDta operation can use the existing
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command. In this case, if no row and column are specified, the display address
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used for the second operation will be the one after the first operation is
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issued. If an intervening operation that does not require a WTD, such as a
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QsnClrScr or a QsnSetErr, is added to the command buffer between two operations
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that do require a WTD command, a second WTD command is added to the buffer for
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the second operation.</p>
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<p>The screen output APIs that require a WTD command and that correspond to the
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WTD command <strong>orders</strong> (as described in 5250 Functions Reference,
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SA21-9247) are as follows:</p>
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<blockquote>
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<p>Set Output Address (QsnSetOutAdr)</p>
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<p>Write Data (QsnWrtDta)</p>
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<p>Write Transparent Data (QsnWrtTDta)</p>
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<p>Pad for N Positions (QsnWrtPad)</p>
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<p>Pad between Two Screen Addresses (QsnWrtPadAdr)</p>
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<p>Set Field (QsnSetFld)</p>
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<p>Set Cursor Address (QsnSetCsrAdr)</p>
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<p>Insert Cursor (QsnInsCsr)</p>
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</blockquote>
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<p>The cursor position is not affected if the keyboard is unlocked when command
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processing begins and is not locked during command processing, or if a
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parameter error is detected. If specified by control character byte 1, the
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cursor will be moved to the insert cursor or default location when the keyboard
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is unlocked.</p>
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<p>This operation corresponds directly to the 5250 Write to Display command. If
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this is an indirect operation, this operation will issue a new WTD command to
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the command buffer.</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>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 prior to processing the Write to
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Display command. 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 Write to Display command
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has been processed. See <a href="dsm1f.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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</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>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. If this
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parameter is omitted or specified as 0, this is a direct operation and the
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command is sent to the display. Otherwise, this is an indirect operation and
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the command is stored in the command buffer without an I/O operation taking
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place.</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>Return code</strong></dt>
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<dd>OUTPUT; BINARY(4)
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<p>A return code indicating the result of the operation. The value returned
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will be 0 if the operation was 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">CPFA303 E</td>
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<td valign="top">Error occurred for screen I/O operation.</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">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">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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