65 lines
4.2 KiB
HTML
65 lines
4.2 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="concept" />
|
|
<meta name="DC.Title" content="Input and output parameters" />
|
|
<meta name="abstract" content="API parameters can be used for input or output. Some parameters contain both input and output fields; these are identified as input/output (I/O) parameters in the API parameter tables." />
|
|
<meta name="description" content="API parameters can be used for input or output. Some parameters contain both input and output fields; these are identified as input/output (I/O) parameters in the API parameter tables." />
|
|
<meta name="DC.Relation" scheme="URI" content="conParameter.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="conIOParm" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Input and output parameters</title>
|
|
</head>
|
|
<body id="conIOParm"><a name="conIOParm"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Input and output parameters</h1>
|
|
<div><p>API parameters can be used for input or output. Some parameters
|
|
contain both input and output fields; these are identified as input/output
|
|
(I/O) parameters in the API parameter tables.</p>
|
|
<p>Input parameters and fields are not changed by the API. They have the same
|
|
value on the return from the API call as they do before the API call. In contrast,
|
|
output parameters and fields are changed. Any information that an API caller
|
|
(either an application program or an interactive entry on the display) places
|
|
in an output parameter or output field before the call will be lost on the
|
|
return from the call.</p>
|
|
<p>Parameters can be classified into the following general categories:</p>
|
|
<ul><li><em>Input parameters</em>: These parameters must be set to a value before
|
|
calling the API because they pass needed information to the API to enable
|
|
it to perform its function. For example, if the API is to perform a function
|
|
on an object, one of the parameters would be the name and library of that
|
|
object. Input parameters are not changed by the API.</li>
|
|
<li><em>Output parameters</em>: These parameters do not need to be set before
|
|
calling the API because the API returns information to the application in
|
|
these parameters. When a return to the application is successful and no errors
|
|
have occurred, the application then accesses the information returned in output
|
|
parameters.</li>
|
|
<li><em>Input/Output parameters</em>: These are parameters that are identified
|
|
as structures that contain fields. The fields within the structure can be
|
|
either input, output, or both. For example, the bytes provided field in the
|
|
error code parameter is an input field. The rest of the fields that make up
|
|
this parameter are output fields. The rules for input parameters and output
|
|
parameters apply to the individual fields in the structure.</li>
|
|
</ul>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="conParameter.htm" title="After you have found the API that you want to use, you need to code a call to an API and pass to the API the required set of parameters appropriate for that API.">API parameters</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |