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<HTML><HEAD><TITLE>Time</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_CondWaitTimeout"HREF="sdlcondwaittimeout.html"><LINKREL="NEXT"TITLE="SDL_GetTicks"HREF="sdlgetticks.html"><METANAME="KEYWORD"CONTENT="time"><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="sdlcondwaittimeout.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlgetticks.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="CHAPTER"><H1><ANAME="TIME"></A>Chapter 13. Time</H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT><AHREF="sdlgetticks.html">SDL_GetTicks</A> -- Get the number of milliseconds since the SDL library initialization.</DT><DT><AHREF="sdldelay.html">SDL_Delay</A> -- Wait a specified number of milliseconds before returning.</DT><DT><AHREF="sdladdtimer.html">SDL_AddTimer</A> -- Add a timer which will call a callback after the specified number of milliseconds haselapsed.</DT><DT><AHREF="sdlremovetimer.html">SDL_RemoveTimer</A> -- Remove a timer which was added with<AHREF="sdladdtimer.html">SDL_AddTimer</A>.</DT><DT><AHREF="sdlsettimer.html">SDL_SetTimer</A> -- Set a callback to run after the specified number of milliseconds haselapsed.</DT></DL></DIV><P>SDL provides several cross-platform functions for dealing with time.It provides a way to get the current time, a way to wait a little while,and a simple timer mechanism. These functions give you two ways of moving anobject every x milliseconds:<P></P><UL><LI><P>Use a timer callback function. This may have the bad effect that it runs in a seperate thread or uses alarm signals, but it's easier to implement.</P></LI><LI><P>Or you can get the number of milliseconds passed, and move the object if, for example, 30 ms passed.</P></LI></UL> </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="sdlcondwaittimeout.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="sdlgetticks.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_CondWaitTimeout</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_GetTicks</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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