120 lines
4.3 KiB
HTML
120 lines
4.3 KiB
HTML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
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<title>EPICS pva</title>
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<link rel="stylesheet" type="text/css"
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href="http://epics-pvdata.sourceforge.net/base.css" />
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<link rel="stylesheet" type="text/css"
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href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
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<style type="text/css">
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/*<![CDATA[*/
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.about { margin-left: 3em; margin-right: 3em; font-size: .83em}
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table { margin-left: auto; margin-right: auto }
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.diagram { text-align: center; margin: 2.5em 0 }
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body { margin-right: 10% }
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/*]]>*/</style>
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<!-- Script that generates the Table of Contents -->
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<script type="text/javascript" src="http://epics-pvdata.sourceforge.net/script/tocgen.js"></script>
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</head>
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<body>
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<div class="head">
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<h1>EPICS pvaClientCPP</h1>
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<h2 class="nocount">Release 4.2.0-SNAPSHOT - 2016-07-14</h2>
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<h2 class="nocount">Abstract</h2>
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<p>pvaClient is a software library that provides to an EPICS client programmer, a friendly
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client side programming interface to the data of an EPICS based control system. It is intended
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for such uses as rapid development of ad hoc programs by controls engineers, or to provide
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scientists a way to directly develop analytical applications.</p>
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<p>Specifically, pvaClient provides a synchronous interface for pvAccess, which is the
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software support for high speed controls network communications used in EPICS version 4.
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pvAccess provides a callback based interface, which can be hard to use.
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pvaClient provides an interface that does not require callbacks even for monitors.
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</p>
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<p>
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pvaClientChannel provides many "convenience" methods to directly get and put
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scalar and scalarArray data types.
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Additional methods provide access to the full features of pvAccess.
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</p>
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<p>
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pvaClientMultiChannel provides access to data from multiple channels.
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It can be used directly by a client or via pvaClientMultiDouble or pvaClientNTMultiChannel.
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pvaClientMultiDouble allows the client to get and put data to multiple channels.
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But each channel must have a value field that is a numeric scalar.
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pvaClientNTMultiChannel allows the client to get and put data to multiple channels.
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Each channel must have a value field.
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The data for the channels is presented via normative type NTMultiChannel.
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</p>
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<!-- last para of Abstract is boilerplate reference to EPICS -->
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<p>For more information about EPICS generally, please refer to the home page of the <a
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href="http://www.aps.anl.gov/epics/">Experimental Physics and Industrial
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Control System</a>.</p>
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</div> <!-- head -->
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<div id="toc">
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<h2 class="nocount">Table of Contents</h2>
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</div>
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<!-- Place what you would like in the Table of Contents, inside the contents div -->
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<div id="contents" class="contents">
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<hr />
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<h2>Overview</h2>
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<p>
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pvaClientCPP is one of the components of
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<a href="http://epics-pvdata.sourceforge.net">
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EPICS Version 4
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</a>
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</p>
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<p>This document is only a guide to help locate code and documentation related to pvDatabaseCPP
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</p>
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<p>
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It is intended for developers that want to use pvDatabaseCPP.
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</p>
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<h2>Developer Guide</h2>
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<p>A guide for developers is available at
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<a
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href="http://epics-pvdata.sourceforge.net/informative/developerGuide/developerGuide.html">
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developerGuide
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</a>
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</p>
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<p>This guide discusses all the components that are part of an <b>EPICS V4</b> release.
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Some understanding of the components and how they are related is necessary in order to
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develop code that uses pvDatabaseCPP.
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In particular read everything related to pvaClient.
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</p>
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<p>The developerGuide discusses code in a way that applies to both CPP and C++.
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For the descriptions of the CPP specific code consult the next section.
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</p>
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<h2>doxygen</h2>
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<p>doxygen documentation is available at
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<a
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href="./html/index.html">doxygen</a>
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</p>
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<h2>exampleCPP</h2>
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<p>Example code is available as part of this release.
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<a
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href="http://epics-pvdata.sourceforge.net/docbuild/exampleCPP/tip/documentation/exampleCPP.html">
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exampleCPP
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</a>
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</p>
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<p>In particular look at exampleClient.
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It has many examples of using pvaClientCPP.
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</p>
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</div> <!-- class="contents" -->
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</body>
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</html>
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