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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>Qt Netscape Plugin Extension</h1>
<p> <!-- index Netscape --><a name="Netscape"></a>
<p> The Qt Netscape Plugin software makes it easy to write browser plugins
that can be used on both Unix/Linux and MS-Windows, in Netscape,
Mozilla, and any other web browser supporting Netscape's LiveConnect
protocol. Modern versions of MSIE do not support this protocol. Use
the <a href="activeqt.html#ActiveQt">ActiveQt</a> Framework to develop plugins for these browsers.
<p> <h2> Information
</h2>
<a name="1"></a><p> The Netscape Plugin Extension consists of the follow classes:
<ul>
<li> <a href="qnplugin.html">QNPlugin</a>
<li> <a href="qnpinstance.html">QNPInstance</a>
<li> <a href="qnpwidget.html">QNPWidget</a>
<li> <a href="qnpstream.html">QNPStream</a>
</ul>
<p> <h2> How-to
</h2>
<a name="2"></a><p> <ol type=1>
<li> Download the
<a href="http://home.netscape.com/comprod/development_partners/plugin_api/index.html">Plugin SDK from Netscape</a>, and copy the following files from there to
<tt>$QTDIR/extensions/nsplugin/src</tt>
<ul>
<li> <tt>common/npwin.cpp</tt>
<li> <tt>common/npunix.c</tt>
<li> <tt>include/npapi.h</tt>
<li> <tt>include/npupp.h</tt>
<li> <tt>include/jri.h</tt>
<li> <tt>include/jri_md.h</tt>
<li> <tt>include/jritypes.h</tt>
</ul>
<li> Build the Netscape Plugin extension library, found in the
<tt>extensions/nsplugin/src</tt> directory of your Qt distribution.
This produces a static library to be linked with your plugin code.
<li> Read the <a href="qnplugin.html">plugin class documentation</a>, and
examine the <a href="nsplugin-examples.html">example plugins</a>.
<li> Do most of your development as a stand-alone Qt application - debugging
Netscape Plugins is cumbersome. You may want to use <tt>signal(2)</tt>
in your plugin to enable core-dumps if your browser disables them.
<li> Note the platform-specific build steps below.
<li> Read about the raw plugin interface
<a href="http://developer.netscape.com/docs/manuals/communicator/plugin/index.htm">in Netscape's handbook.</a>
<li> If files viewed by a plugin are provided by an HTTP server
(using a <a href="http://...">http://...</a> URL) then
the server must be configured to send the correct MIME type
for the file, e.g. by editing Apache's <tt>mime.types</tt> file.
If the files are viewed via a <a href="file://...">//...</a>
URL, then the browser will use the filename extension to decide
the file type (and hence the plugin to load) - the user may need
to set the filename extension in the Helpers or Applications
section of their browser preferences.
</ol>
<p> <h3> Building under X11
</h3>
<a name="2-1"></a><p> <ul>
<li> The Makefiles in the examples are appropriate for UNIX/X11.
<li> The user must install the resulting Shared Object in the Plugins
directory of the browser.
</ul>
<p> <h3> Building under Windows
</h3>
<a name="2-2"></a><p> <ul>
<li> For Netscape plugins to work, Qt needs to be in the system DLL
path or be compiled into the plugin as a static library.
<li> Plugins must be named <tt>np</tt><em>name</em><tt>.dll</tt>,
or the browser will ignore them.
<li> The link step must include:
<ul>
<li> <tt>/def:</tt><em>name</em><tt>.def</tt>
<li> <tt>/dll</tt>
<li> a compiled resource file defining the
file/MIME types accepted by the plugin.
</ul>
<li> The user must install the resulting DLL in the Plugins directory
of the browser.
</ul>
<p> <h2> Known Bugs and Limitations
</h2>
<a name="3"></a><p> The Qt-based LiveConnect Plugin binding code has a number of bugs and
limitations, but is sufficiently stable for many production
applications.
<p> <ul>
<li> Keyboard input only works in secondary windows (e.g. dialogs created by the plugin).
<li> You should not expect modality between the plugin and the browser to work.
<li> Netscape 4.78 on Unix/X11 tends to terminate with a bus error.
<li> Opaque resize behaviour is erratic due to browser behavior.
</ul>
<p>
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