Mercurial > sdl-ios-xcode
view docs/html/sdlgetkeystate.html @ 3818:49eadd6e8962 SDL-ryan-multiple-audio-device
Mangled ALSA dynamic loading...static loading will still work if you have the
right libraries, but this is expected to break in general cases as we start
dealing with different symbol versions, etc (but may work with, say,
distro-specific packages, etc).
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Fri, 06 Oct 2006 19:45:11 +0000 |
parents | 355632dca928 |
children |
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<HTML ><HEAD ><TITLE >SDL_GetKeyState</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="SDL Library Documentation" HREF="index.html"><LINK REL="UP" TITLE="Event Functions." HREF="eventfunctions.html"><LINK REL="PREVIOUS" TITLE="SDL_EventState" HREF="sdleventstate.html"><LINK REL="NEXT" TITLE="SDL_GetModState" HREF="sdlgetmodstate.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >SDL Library Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="sdleventstate.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdlgetmodstate.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLGETKEYSTATE" ></A >SDL_GetKeyState</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN5686" ></A ><H2 >Name</H2 >SDL_GetKeyState -- Get a snapshot of the current keyboard state</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN5689" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN5690" ></A ><P ></P ><PRE CLASS="FUNCSYNOPSISINFO" >#include "SDL.h"</PRE ><P ><CODE ><CODE CLASS="FUNCDEF" >Uint8 *<B CLASS="FSFUNC" >SDL_GetKeyState</B ></CODE >(int *numkeys);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="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 <TT CLASS="PARAMETER" ><I >numkeys</I ></TT >. The array is indexed by the <A HREF="sdlkey.html" ><TT CLASS="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 ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Note: </B >Use <A HREF="sdlpumpevents.html" ><TT CLASS="FUNCTION" >SDL_PumpEvents</TT ></A > to update the state array.</P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN5706" ></A ><H2 >Example</H2 ><P ><PRE CLASS="PROGRAMLISTING" >Uint8 *keystate = SDL_GetKeyState(NULL); if ( keystate[SDLK_RETURN] ) printf("Return Key Pressed.\n");</PRE ></P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN5710" ></A ><H2 >See Also</H2 ><P ><A HREF="sdlkey.html" ><TT CLASS="LITERAL" >SDL Key Symbols</TT ></A >, <A HREF="sdlpumpevents.html" ><TT CLASS="FUNCTION" >SDL_PumpEvents</TT ></A ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sdleventstate.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sdlgetmodstate.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_EventState</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="eventfunctions.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDL_GetModState</TD ></TR ></TABLE ></DIV ></BODY ></HTML >