📄 sdlpollevent.html

📁 VC5.6.7的一个扩展库。跟DirectX的功能差不多。
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<HTML><HEAD><TITLE>SDL_PollEvent</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="Event Functions."HREF="eventfunctions.html"><LINKREL="PREVIOUS"TITLE="SDL_PeepEvents"HREF="sdlpeepevents.html"><LINKREL="NEXT"TITLE="SDL_WaitEvent"HREF="sdlwaitevent.html"></HEAD><BODYCLASS="REFENTRY"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="sdlpeepevents.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlwaitevent.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLPOLLEVENT"></A>SDL_PollEvent</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN5472"></A><H2>Name</H2>SDL_PollEvent&nbsp;--&nbsp;Polls for currently pending events.</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN5475"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN5476"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">int <BCLASS="FSFUNC">SDL_PollEvent</B></CODE>(SDL_Event *event);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN5482"></A><H2>Description</H2><P>Polls for currently pending events, and returns <SPANCLASS="RETURNVALUE">1</SPAN> if there are any pending events, or <SPANCLASS="RETURNVALUE">0</SPAN> if there are none available.  </P><P>If <TTCLASS="PARAMETER"><I>event</I></TT> is not <TTCLASS="LITERAL">NULL</TT>, the next event is removed from the queue and stored in that area.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN5490"></A><H2>Examples</H2><P><PRECLASS="PROGRAMLISTING">SDL_Event event; /* Event structure */.../* Check for events */while(SDL_PollEvent(&#38;event)){  /* Loop until there are no events left on the queue */  switch(event.type){  /* Process the appropiate event type */    case SDL_KEYDOWN:  /* Handle a KEYDOWN event */               printf("Oh! Key press\n");      break;    case SDL_MOUSEMOTION:      .      .      .    default: /* Report an unhandled event */      printf("I don't know what this event is!\n");  }}</PRE></P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN5494"></A><H2>See Also</H2><P><AHREF="sdlevent.html"><SPANCLASS="STRUCTNAME">SDL_Event</SPAN></A>,<AHREF="sdlwaitevent.html"><TTCLASS="FUNCTION">SDL_WaitEvent</TT></A>,<AHREF="sdlpeepevents.html"><TTCLASS="FUNCTION">SDL_PeepEvents</TT></A></P></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="sdlpeepevents.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="sdlwaitevent.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_PeepEvents</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="eventfunctions.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_WaitEvent</TD></TR></TABLE></DIV></BODY></HTML>
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