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<HTML><HEAD><TITLE>Events</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="SDL Reference"HREF="reference.html"><LINKREL="PREVIOUS"TITLE="SDL_WM_GrabInput"HREF="sdlwmgrabinput.html"><LINKREL="NEXT"TITLE="SDL Event Structures."HREF="eventstructures.html"><METANAME="KEYWORD"CONTENT="events"><METANAME="KEYWORD"CONTENT="function"></HEAD><BODYCLASS="CHAPTER"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlwmgrabinput.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="eventstructures.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="CHAPTER"><H1><ANAME="EVENT"></A>Chapter 8. Events</H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT><AHREF="event.html#AEN3691">Introduction</A></DT><DT><AHREF="eventstructures.html">SDL Event Structures.</A></DT><DT><AHREF="eventfunctions.html">Event Functions.</A></DT></DL></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="AEN3691"></A>Introduction</H1><P>Event handling allows your application to receive input from the user. Event handling is initalised (along with video) with a call to:<PRECLASS="PROGRAMLISTING">SDL_Init(SDL_INIT_VIDEO);</PRE>Internally, SDL stores all the events waiting to be handled in an event queue. Using functions like <AHREF="sdlpollevent.html"><TTCLASS="FUNCTION">SDL_PollEvent</TT></A> and <AHREF="sdlpeepevents.html"><TTCLASS="FUNCTION">SDL_PeepEvents</TT></A> you can observe and handle waiting input events.</P><P>The key to event handling in SDL is the <AHREF="sdlevent.html"><SPANCLASS="STRUCTNAME">SDL_Event</SPAN></A> union. The event queue itself is composed of a series of <SPANCLASS="STRUCTNAME">SDL_Event</SPAN> unions, one for each waiting event. <SPANCLASS="STRUCTNAME">SDL_Event</SPAN> unions are read from the queue with the <TTCLASS="FUNCTION">SDL_PollEvent</TT> function and it is then up to the application to process the information stored with them.</P></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlwmgrabinput.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="eventstructures.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_WM_GrabInput</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL Event Structures.</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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