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symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdlsettimer.html
author William Roberts <williamr@symbian.org>
Fri, 07 Aug 2009 11:20:16 +0100
changeset 7 b016402e601c
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Fix E32PATH to make bootstrap compile correctly, tidy up other extension option paths
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
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Description</H2
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   128
 
>Set a callback to run after the specified number of milliseconds has
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   129
 
elapsed. The callback function is passed the current timer interval
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   130
 
and returns the next timer interval.  If the returned value is the
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   131
 
same as the one passed in, the periodic alarm continues, otherwise a
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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new alarm is scheduled.</P
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   134
 
>To cancel a currently running timer, call
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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<TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_SetTimer(0, NULL);</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   138
 
></P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   139
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>The timer callback function may run in a different thread than your
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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main constant, and so shouldn't call any functions from within itself.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   143
 
>The maximum resolution of this timer is 10 ms, which means that if
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   144
 
you request a 16 ms timer, your callback will run approximately 20 ms
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   145
 
later on an unloaded system.  If you wanted to set a flag signaling
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   146
 
a frame update at 30 frames per second (every 33 ms), you might set a
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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timer for 30 ms (see example below).</P
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>If you use this function, you need to pass <TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   150
 
CLASS="LITERAL"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   151
 
>SDL_INIT_TIMER</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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to <TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   154
 
CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_Init()</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="NOTE"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><BLOCKQUOTE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="NOTE"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><B
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Note: </B
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>This function is kept for compatibility but has been superseded
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   165
 
by the new timer functions
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   167
 
HREF="sdladdtimer.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_AddTimer</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   169
 
> and
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   171
 
HREF="sdlremovetimer.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_RemoveTimer</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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> which support
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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multiple timers.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></BLOCKQUOTE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="REFSECT1"
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   181
 
NAME="AEN8584"
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></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Examples</H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><PRE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   187
 
CLASS="PROGRAMLISTING"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   188
 
>SDL_SetTimer((33/10)*10, my_callback);</PRE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   189
 
></P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   191
 
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   192
 
CLASS="REFSECT1"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   193
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
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diff changeset 
   194
 
NAME="AEN8588"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   195
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   196
 
><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   197
 
>See Also</H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   198
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   199
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   200
 
HREF="sdladdtimer.html"
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   201
 
><TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   202
 
CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   203
 
>SDL_AddTimer</TT
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   204
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   205
 
></P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   206
 
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   207
 
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   208
 
CLASS="NAVFOOTER"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   209
 
><HR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   210
 
ALIGN="LEFT"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   211
 
WIDTH="100%"><TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   212
 
SUMMARY="Footer navigation table"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   213
 
WIDTH="100%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   214
 
BORDER="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   215
 
CELLPADDING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   216
 
CELLSPACING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   217
 
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   218
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   219
 
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   220
 
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   221
 
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   222
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   223
 
HREF="sdlremovetimer.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   224
 
ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   225
 
>Prev</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   226
 
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   227
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   228
 
WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   229
 
ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   230
 
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   231
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   232
 
HREF="index.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   233
 
ACCESSKEY="H"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
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diff changeset 
   234
 
>Home</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   235
 
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   236
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   237
 
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   238
 
ALIGN="right"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   239
 
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   240
 
>&nbsp;</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   241
 
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   242
 
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   243
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   244
 
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   245
 
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   246
 
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   247
 
>SDL_RemoveTimer</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   248
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   249
 
WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   250
 
ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   251
 
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><A
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