qobjectcleanuphandler.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/kernel/qobjectcleanuphandler.cpp:39 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QObjectCleanupHandler Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QObjectCleanupHandler Class Reference</h1><p>The QObjectCleanupHandler class watches the lifetime of multiple QObjects.<a href="#details">More...</a><p><tt>#include <<a href="qobjectcleanuphandler-h.html">qobjectcleanuphandler.h</a>></tt><p>Inherits <a href="qobject.html">QObject</a>.<p><a href="qobjectcleanuphandler-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QObjectCleanupHandler"><b>QObjectCleanupHandler</b></a> ()</div></li><li><div class=fn><a href="#~QObjectCleanupHandler"><b>~QObjectCleanupHandler</b></a> ()</div></li><li><div class=fn>QObject * <a href="#add"><b>add</b></a> ( QObject * object )</div></li><li><div class=fn>void <a href="#remove"><b>remove</b></a> ( QObject * object )</div></li><li><div class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</div></li><li><div class=fn>void <a href="#clear"><b>clear</b></a> ()</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2>The QObjectCleanupHandler class watches the lifetime of multiple QObjects.<p> <p> A QObjectCleanupHandler is useful whenever you need to know when anumber of <a href="qobject.html">QObject</a>s that are owned by someone else have beendeleted. This is important, for example, when referencing memoryin an application that has been allocated in a shared library.<p> Example:<p> <pre> class FactoryComponent : public FactoryInterface, public QLibraryInterface { public: ... <a href="qobject.html">QObject</a> *createObject(); bool init(); void cleanup(); bool canUnload() const; private: QObjectCleanupHandler objects; }; // allocate a new object, and add it to the cleanup handler QObject *FactoryComponent::createObject() { return objects.<a href="#add">add</a>( new <a href="qobject.html">QObject</a>() ); } // QLibraryInterface implementation bool FactoryComponent::init() { return TRUE; } void FactoryComponent::cleanup() { } // it is only safe to unload the library when all QObject's have been destroyed bool FactoryComponent::canUnload() const { return objects.<a href="#isEmpty">isEmpty</a>(); } </pre> <p>See also <a href="objectmodel.html">Object Model</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QObjectCleanupHandler"></a>QObjectCleanupHandler::QObjectCleanupHandler ()</h3>Constructs an empty QObjectCleanupHandler.<h3 class=fn><a name="~QObjectCleanupHandler"></a>QObjectCleanupHandler::~QObjectCleanupHandler ()</h3>Destroys the cleanup handler. All objects in this cleanup handlerwill be deleted.<h3 class=fn><a href="qobject.html">QObject</a> * <a name="add"></a>QObjectCleanupHandler::add ( <a href="qobject.html">QObject</a> * object )</h3>Adds <em>object</em> to this cleanup handler and returns the pointer tothe object.<h3 class=fn>void <a name="clear"></a>QObjectCleanupHandler::clear ()</h3>Deletes all objects in this cleanup handler. The cleanup handlerbecomes empty.<h3 class=fn>bool <a name="isEmpty"></a>QObjectCleanupHandler::isEmpty () const</h3>Returns TRUE if this cleanup handler is empty or if all objects inthis cleanup handler have been destroyed; otherwise return FALSE.<h3 class=fn>void <a name="remove"></a>QObjectCleanupHandler::remove ( <a href="qobject.html">QObject</a> * object )</h3>Removes the <em>object</em> from this cleanup handler. The object willnot be destroyed.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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