Mercurial > sdl-ios-xcode
view docs/html/sdlkeyboardevent.html @ 1614:6162b8d921ce
Date: Wed, 29 Mar 2006 17:26:55 +0200 CEST
From: "Fran���is Revol"
Subject: [SDL] BeOS port fix: PrintScreen key crashing
It seems the latest SDL crashes when someone hits the PrtScrn key in
ZETA (BeOS R6), somewhere it gets a negative value as key code (or a
big unsigned maybe ?), and uses it as an index in the keysym table...
I'll investigate the cause for the negative value, but it's always
better to check for bounds correctly when indexing a table. The
attached diff fixes it.
Fran���is Revol
--
Software Architect
yellowTAB GmbH
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 31 Mar 2006 06:16:20 +0000 |
parents | 355632dca928 |
children |
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<HTML ><HEAD ><TITLE >SDL_KeyboardEvent</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="SDL Event Structures." HREF="eventstructures.html"><LINK REL="PREVIOUS" TITLE="SDL_ActiveEvent" HREF="sdlactiveevent.html"><LINK REL="NEXT" TITLE="SDL_MouseMotionEvent" HREF="sdlmousemotionevent.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="sdlactiveevent.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdlmousemotionevent.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLKEYBOARDEVENT" ></A >SDL_KeyboardEvent</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN4011" ></A ><H2 >Name</H2 >SDL_KeyboardEvent -- Keyboard event structure</DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4014" ></A ><H2 >Structure Definition</H2 ><PRE CLASS="PROGRAMLISTING" >typedef struct{ Uint8 type; Uint8 state; SDL_keysym keysym; } SDL_KeyboardEvent;</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4017" ></A ><H2 >Structure Data</H2 ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN4019" ></A ><P ></P ><TABLE BORDER="0" CLASS="CALSTABLE" ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >type</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="LITERAL" >SDL_KEYDOWN</TT > or <TT CLASS="LITERAL" >SDL_KEYUP</TT ></TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >state</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="LITERAL" >SDL_PRESSED</TT > or <TT CLASS="LITERAL" >SDL_RELEASED</TT ></TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >keysym</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Contains key press information</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4038" ></A ><H2 >Description</H2 ><P ><SPAN CLASS="STRUCTNAME" >SDL_KeyboardEvent</SPAN > is a member of the <A HREF="sdlevent.html" ><SPAN CLASS="STRUCTNAME" >SDL_Event</SPAN ></A > union and is used when an event of type <TT CLASS="LITERAL" >SDL_KEYDOWN</TT > or <TT CLASS="LITERAL" >SDL_KEYUP</TT > is reported.</P ><P >The <TT CLASS="STRUCTFIELD" ><I >type</I ></TT > and <TT CLASS="STRUCTFIELD" ><I >state</I ></TT > actually report the same information, they just use different values to do it! A keyboard event occurs when a key is released (<TT CLASS="STRUCTFIELD" ><I >type</I ></TT >=<TT CLASS="LITERAL" >SDK_KEYUP</TT > or <TT CLASS="STRUCTFIELD" ><I >state</I ></TT >=<TT CLASS="LITERAL" >SDL_RELEASED</TT >) and when a key is pressed (<TT CLASS="STRUCTFIELD" ><I >type</I ></TT >=<TT CLASS="LITERAL" >SDL_KEYDOWN</TT > or <TT CLASS="STRUCTFIELD" ><I >state</I ></TT >=<TT CLASS="LITERAL" >SDL_PRESSED</TT >). The information on what key was pressed or released is in the <A HREF="sdlkeysym.html" ><SPAN CLASS="STRUCTNAME" >keysym</SPAN ></A > structure.</P ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Note: </B >Repeating <TT CLASS="LITERAL" >SDL_KEYDOWN</TT > events will occur if key repeat is enabled (see <A HREF="sdlenablekeyrepeat.html" ><TT CLASS="FUNCTION" >SDL_EnableKeyRepeat</TT ></A >).</P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4064" ></A ><H2 >See Also</H2 ><P ><A HREF="sdlevent.html" ><SPAN CLASS="STRUCTNAME" >SDL_Event</SPAN ></A >, <A HREF="sdlkeysym.html" ><SPAN CLASS="STRUCTNAME" >SDL_keysym</SPAN ></A >, <A HREF="sdlenablekeyrepeat.html" ><TT CLASS="FUNCTION" >SDL_EnableKeyRepeat</TT ></A >, <A HREF="sdlenableunicode.html" ><TT CLASS="FUNCTION" >SDL_EnableUNICODE</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="sdlactiveevent.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="sdlmousemotionevent.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_ActiveEvent</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="eventstructures.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDL_MouseMotionEvent</TD ></TR ></TABLE ></DIV ></BODY ></HTML >