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<HTML><HEAD><TITLE>Xlib Programming Manual: Extensions: XQueryExtension</TITLE></HEAD><BODY><H1 ALIGN=center>XQueryExtension</H1><H2>Syntax</H2><!.IN "XQueryExtension" "" "@DEF@"><CODE><PRE>Bool XQueryExtension(<B>display</B>, <B>name</B>, <B>major_opcode_return</B>, <B>first_event_return</B>, <B>first_error_return</B>)      <A HREF="../../display/opening.html#Display">Display</A> *<B>display</B>;      char *<B>name;</B>      int *<B>major_opcode_return</B>;      int *<B>first_event_return</B>;      int *<B>first_error_return</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>name</B><TD> Specifies the extension name.<TR><TD> <B>major_opcode_return</B><TD> Returns the major opcode.<TR><TD> <B>first_event_return</B><TD> Returns the first event code, if any.<TR><TD> <B></B><TD> Specifies the extension list.</TABLE><H2>Description</H2>The<B>XQueryExtension()</B>function determines if the named extension is present.  If the extension is not present,<B>XQueryExtension()</B>returns<B>False</B>;otherwise, it returns<B>True</B>.If the extension is present,<B>XQueryExtension()</B>returns the major opcode for the extension to major_opcode_return;otherwise,it returns zero.Any minor opcode and the request formats are specific to theextension.  If the extension involves additional event types, <B>XQueryExtension()</B>returns the base event type code to first_event_return;otherwise, it returns zero.  The format of the events is specific to the extension.  If the extension involves additional error codes, <B>XQueryExtension()</B>returns the base error code to first_error_return;otherwise, it returns zero.  The format of additional data in the errors is specific to the extension.<H2>See also</H2><B><A HREF="XFreeExtensionList.html">XFreeExtensionList()</A></B>,<B><A HREF="XListExtensions.html">XListExtensions()</A></B>,"<A HREF="basic-protocol-support.html">Basic Protocol Support Routines</A>".<HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>

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