📄 sdlgetkeystate.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_GetKeyState</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_EventState"HREF="sdleventstate.html"><LINKREL="NEXT"TITLE="SDL_GetModState"HREF="sdlgetmodstate.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="sdleventstate.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlgetmodstate.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLGETKEYSTATE"></A>SDL_GetKeyState</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN5686"></A><H2>Name</H2>SDL_GetKeyState&nbsp;--&nbsp;Get a snapshot of the current keyboard state</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN5689"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN5690"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">Uint8 *<BCLASS="FSFUNC">SDL_GetKeyState</B></CODE>(int *numkeys);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN5696"></A><H2>Description</H2><P>Gets a snapshot of the current keyboard state. The current state is return as a pointer to an array, the size of this array is stored in <TTCLASS="PARAMETER"><I>numkeys</I></TT>. The array is indexed by the <AHREF="sdlkey.html"><TTCLASS="LITERAL">SDLK_*</TT></A> symbols. A value of 1 means the key is pressed and a value of 0 means its not. The pointer returned is a pointer to an internal SDL array and should not be freed by the caller.</P><DIVCLASS="NOTE"><BLOCKQUOTECLASS="NOTE"><P><B>Note: </B>Use <AHREF="sdlpumpevents.html"><TTCLASS="FUNCTION">SDL_PumpEvents</TT></A> to update the state array.</P></BLOCKQUOTE></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN5706"></A><H2>Example</H2><P><PRECLASS="PROGRAMLISTING">Uint8 *keystate = SDL_GetKeyState(NULL);if ( keystate[SDLK_RETURN] ) printf("Return Key Pressed.\n");</PRE></P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN5710"></A><H2>See Also</H2><P><AHREF="sdlkey.html"><TTCLASS="LITERAL">SDL Key Symbols</TT></A>,<AHREF="sdlpumpevents.html"><TTCLASS="FUNCTION">SDL_PumpEvents</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="sdleventstate.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="sdlgetmodstate.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_EventState</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="eventfunctions.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_GetModState</TD></TR></TABLE></DIV></BODY></HTML>
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