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<HTML><HEAD><TITLE>Xlib Programming Manual: Extensions: Hooking into Xlib </TITLE></HEAD><BODY><H1 ALIGN=center>Hooking into Xlib </H1>These functions allow you to hook into the library. They are not normally used by application programmers but are used by people who need to extend the core X protocol andthe X library interface.The functions, which generate protocol requests for X, are typicallycalled stubs.<P>In extensions, stubs first should check to see if they have initialized themselves on a connection.If they have not, they then should call <B><A HREF="XInitExtension.html">XInitExtension()</A></B>to attempt to initialize themselves on the connection.<P>If the extension needs to be informed of GC/font allocation ordeallocation or if the extension defines new event types, the functions described here allow the extension to be called when these events occur.<A NAME="XExtCodes"></A><P>The<B>XExtCodes</B>structure returns the information from <B><A HREF="XInitExtension.html">XInitExtension()</A></B>and is defined in<B><TT>X11/Xlib.h : </TT></B><P><!.IN "XExtCodes" "" "@DEF@"><PRE><CODE>typedef struct _XExtCodes { /* public to extension, cannot be changed */ int extension; /* extension number */ int major_opcode; /* major op-code assigned by server */ int first_event; /* first event number for the extension */ int first_error; /* first error number for the extension */} XExtCodes;</PRE></CODE><P>To allocate an <B>XExtCodes</B>, use<B><A HREF="XAddExtension.html">XAddExtension()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="hooks-into-the-library.html">Hooks into the Library</A></I></H5><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>⌨️ 快捷键说明
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