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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QNPlugin Class Reference</h1>
<p>The QNPlugin class provides the main factory for plugin objects.
<a href="#details">More...</a>
<p>This class is part of the <b>Qt Netscape Extension</b>.
<p><tt>#include <<a href="qnp-h.html">qnp.h</a>></tt>
<p><a href="qnplugin-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn>virtual <a href="#~QNPlugin"><b>~QNPlugin</b></a> ()</li>
<li class=fn>void <a href="#getVersionInfo"><b>getVersionInfo</b></a> ( int & plugin_major, int & plugin_minor, int & browser_major, int & browser_minor )</li>
<li class=fn>virtual QNPInstance * <a href="#newInstance"><b>newInstance</b></a> () = 0</li>
<li class=fn>virtual const char * <a href="#getMIMEDescription"><b>getMIMEDescription</b></a> () const = 0</li>
<li class=fn>virtual const char * <a href="#getPluginNameString"><b>getPluginNameString</b></a> () const = 0</li>
<li class=fn>virtual const char * <a href="#getPluginDescriptionString"><b>getPluginDescriptionString</b></a> () const = 0</li>
<li class=fn>virtual void * <a href="#getJavaClass"><b>getJavaClass</b></a> ()</li>
<li class=fn>virtual void <a href="#unuseJavaClass"><b>unuseJavaClass</b></a> ()</li>
<li class=fn>void * <a href="#getJavaEnv"><b>getJavaEnv</b></a> () const</li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li class=fn>QNPlugin * <a href="#create"><b>create</b></a> ()</li>
<li class=fn>QNPlugin * <a href="#actual"><b>actual</b></a> ()</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn><a href="#QNPlugin"><b>QNPlugin</b></a> ()</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
<p> This class is defined in the <b>Qt <a href="netscape-plugin.html#Netscape">Netscape</a> Extension</b>, which can be found in the <tt>qt/extensions</tt> directory. It is not included in the main Qt API.
<p>
The QNPlugin class provides the main factory for plugin objects.
<p>
<p> This class is the heart of the plugin. One instance of this object
is created when the plugin is <em>first</em> needed, by calling
<a href="#create">QNPlugin::create</a>(), which must be implemented in your plugin code
to return some derived class of QNPlugin. The one QNPlugin object
creates all <a href="qnpinstance.html">QNPInstance</a> instances for a web browser running in a
single process.
<p> Additionally, if Qt is linked to the plugin as a dynamic library,
only one instance of <a href="qapplication.html">QApplication</a> will exist <em>across all plugins that have been made with Qt</em>. So, your plugin should tread lightly
on global settings. Do not, for example, use
<a href="qapplication.html#setFont">QApplication::setFont</a>() - that will change the font in every
widget of every Qt-based plugin currently loaded!
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QNPlugin"></a>QNPlugin::QNPlugin ()<tt> [protected]</tt>
</h3>
Creates a QNPlugin. This may only be used by the constructor
of the class, derived from QNPlugin, that is returned by your
plugin's implementation of the <a href="#create">QNPlugin::create</a>() function.
<h3 class=fn><a name="~QNPlugin"></a>QNPlugin::~QNPlugin ()<tt> [virtual]</tt>
</h3>
Destroys the QNPlugin. This is called by the plugin binding code
just before the plugin is about to be unloaded from memory. If
newWindow() has been called, a <a href="qapplication.html">QApplication</a> will still exist at
this time, but will be deleted shortly after, just before the plugin
is deleted.
<h3 class=fn><a href="qnplugin.html">QNPlugin</a> * <a name="actual"></a>QNPlugin::actual ()<tt> [static]</tt>
</h3>
Returns the plugin most recently returned by <a href="#create">QNPlugin::create</a>().
<h3 class=fn><a href="qnplugin.html">QNPlugin</a> * <a name="create"></a>QNPlugin::create ()<tt> [static]</tt>
</h3>
<p> This function must be implemented by your plugin code. It should return a
derived class of QNPlugin.
<h3 class=fn>void * <a name="getJavaClass"></a>QNPlugin::getJavaClass ()<tt> [virtual]</tt>
</h3>
Override this function to return a reference to the Java class that represents
the plugin. The default returns 0, indicating no class.
<p> If you override this class, you must also override
<a href="#unuseJavaClass">QNPlugin::unuseJavaClass</a>().
<p> The return value is actually a <tt>jref</tt>; we use <tt>void*</tt> so as to
avoid burdening plugins which do not require Java.
<p> <p>See also <a href="#getJavaEnv">getJavaEnv</a>() and <a href="qnpinstance.html#getJavaPeer">QNPInstance::getJavaPeer</a>().
<h3 class=fn>void * <a name="getJavaEnv"></a>QNPlugin::getJavaEnv () const
</h3>
Returns a pointer to the Java execution environment, or 0 if
either Java is disabled or an error occurred.
<p> The return value is actually a <tt>JRIEnv*</tt>; we use <tt>void*</tt> so as
to avoid burdening plugins which do not require Java.
<p> <p>See also <a href="#getJavaClass">getJavaClass</a>() and <a href="qnpinstance.html#getJavaPeer">QNPInstance::getJavaPeer</a>().
<h3 class=fn>const char * <a name="getMIMEDescription"></a>QNPlugin::getMIMEDescription () const<tt> [pure virtual]</tt>
</h3>
<p> Override this function to return the MIME description of the data formats
supported by your plugin. The format of this string is shown by
the following example:
<p> <pre>
const char* getMIMEDescription() const
{
return "image/x-png:png:PNG Image;"
"image/png:png:PNG Image;"
"image/x-portable-bitmap:pbm:PBM Image;"
"image/x-portable-graymap:pgm:PGM Image;"
"image/x-portable-pixmap:ppm:PPM Image;"
"image/bmp:bmp:BMP Image;"
"image/x-ms-bmp:bmp:BMP Image;"
"image/x-xpixmap:xpm:XPM Image;"
"image/xpm:xpm:XPM Image";
}
</pre>
<h3 class=fn>const char * <a name="getPluginDescriptionString"></a>QNPlugin::getPluginDescriptionString () const<tt> [pure virtual]</tt>
</h3>
<p> Returns a pointer to the plain-text description of the plugin.
<h3 class=fn>const char * <a name="getPluginNameString"></a>QNPlugin::getPluginNameString () const<tt> [pure virtual]</tt>
</h3>
<p> Returns a pointer to the plain-text name of the plugin.
<h3 class=fn>void <a name="getVersionInfo"></a>QNPlugin::getVersionInfo ( int & plugin_major, int & plugin_minor, int & browser_major, int & browser_minor )
</h3>
Populates <em>*</em><em>plugin_major</em> and <em>*</em><em>plugin_minor</em> with the
version of the plugin API and populates <em>*</em><em>browser_major</em> and
<em>*</em><em>browser_minor</em> with the version of the web browser.
<h3 class=fn><a href="qnpinstance.html">QNPInstance</a> * <a name="newInstance"></a>QNPlugin::newInstance ()<tt> [pure virtual]</tt>
</h3>
<p> Override this function to return an appropriate derived class of
<a href="qnpinstance.html">QNPInstance</a>.
<h3 class=fn>void <a name="unuseJavaClass"></a>QNPlugin::unuseJavaClass ()<tt> [virtual]</tt>
</h3>
This function is called when the plugin is shutting down. The
function should <em>unuse</em> the Java class returned earlier by
<a href="#getJavaClass">getJavaClass</a>().
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