symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdlsettimer.html
author Shane McErlean <shane.mcerlean@accenture.com>
Fri, 27 Aug 2010 16:03:29 +0100
changeset 101 5d2aacefd978
parent 1 2fb8b9db1c86
permissions -rw-r--r--
NTT DOCOMO, INC - Fix for bug 1291 "E32test t_tock.exe failed to load Logical Device"
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<HTML
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><HEAD
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><TITLE
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>SDL_SetTimer</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Time"
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HREF="time.html"><LINK
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REL="PREVIOUS"
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TITLE="SDL_RemoveTimer"
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HREF="sdlremovetimer.html"></HEAD
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><BODY
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CLASS="REFENTRY"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="sdlremovetimer.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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>&nbsp;</TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><H1
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><A
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NAME="SDLSETTIMER"
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></A
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>SDL_SetTimer</H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN8557"
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></A
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><H2
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>Name</H2
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>SDL_SetTimer&nbsp;--&nbsp;Set a callback to run after the specified number of milliseconds has
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elapsed.</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN8560"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN8561"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>int <B
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CLASS="FSFUNC"
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>SDL_SetTimer</B
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></CODE
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>(Uint32 interval, SDL_TimerCallback callback);</CODE
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></P
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><P
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></P
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SDLTIMERCALLBACK"
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></A
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><H2
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>Callback</H2
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><P
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>/* Function prototype for the timer callback function */
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typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN8570"
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></A
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><H2
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>Description</H2
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><P
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>Set a callback to run after the specified number of milliseconds has
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elapsed. The callback function is passed the current timer interval
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and returns the next timer interval.  If the returned value is the
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same as the one passed in, the periodic alarm continues, otherwise a
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new alarm is scheduled.</P
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><P
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>To cancel a currently running timer, call
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<TT
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CLASS="FUNCTION"
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>SDL_SetTimer(0, NULL);</TT
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></P
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><P
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>The timer callback function may run in a different thread than your
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main constant, and so shouldn't call any functions from within itself.</P
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><P
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>The maximum resolution of this timer is 10 ms, which means that if
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you request a 16 ms timer, your callback will run approximately 20 ms
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later on an unloaded system.  If you wanted to set a flag signaling
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a frame update at 30 frames per second (every 33 ms), you might set a
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timer for 30 ms (see example below).</P
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><P
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>If you use this function, you need to pass <TT
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CLASS="LITERAL"
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>SDL_INIT_TIMER</TT
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>
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to <TT
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CLASS="FUNCTION"
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>SDL_Init()</TT
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>.</P
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>Note: </B
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>This function is kept for compatibility but has been superseded
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by the new timer functions
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<A
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HREF="sdladdtimer.html"
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>SDL_AddTimer</A
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> and
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<A
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HREF="sdlremovetimer.html"
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>SDL_RemoveTimer</A
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> which support
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multiple timers.</P
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></BLOCKQUOTE
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN8584"
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></A
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><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Examples</H2
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><P
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><PRE
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CLASS="PROGRAMLISTING"
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>SDL_SetTimer((33/10)*10, my_callback);</PRE
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></P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN8588"
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></A
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><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>See Also</H2
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><P
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><A
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HREF="sdladdtimer.html"
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><TT
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CLASS="FUNCTION"
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>SDL_AddTimer</TT
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></A
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></P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="sdlremovetimer.html"
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ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>&nbsp;</TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>SDL_RemoveTimer</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="time.html"
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