Mercurial > sdl-ios-xcode
annotate docs/html/sdlsettimer.html @ 181:e5bc29de3f0a
Updated from the SDL Documentation Project
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 14 Sep 2001 02:41:09 +0000 |
| parents | 55f1f1b3e27d |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetTimer</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Time" | |
| 14 HREF="time.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_RemoveTimer" | |
| 17 HREF="sdlremovetimer.html"></HEAD | |
| 18 ><BODY | |
| 19 CLASS="REFENTRY" | |
| 20 BGCOLOR="#FFF8DC" | |
| 21 TEXT="#000000" | |
| 22 LINK="#0000ee" | |
| 23 VLINK="#551a8b" | |
| 24 ALINK="#ff0000" | |
| 25 ><DIV | |
| 26 CLASS="NAVHEADER" | |
| 27 ><TABLE | |
| 28 WIDTH="100%" | |
| 29 BORDER="0" | |
| 30 CELLPADDING="0" | |
| 31 CELLSPACING="0" | |
| 32 ><TR | |
| 33 ><TH | |
| 34 COLSPAN="3" | |
| 35 ALIGN="center" | |
| 36 >SDL Library Documentation</TH | |
| 37 ></TR | |
| 38 ><TR | |
| 39 ><TD | |
| 40 WIDTH="10%" | |
| 41 ALIGN="left" | |
| 42 VALIGN="bottom" | |
| 43 ><A | |
| 44 HREF="sdlremovetimer.html" | |
| 45 >Prev</A | |
| 46 ></TD | |
| 47 ><TD | |
| 48 WIDTH="80%" | |
| 49 ALIGN="center" | |
| 50 VALIGN="bottom" | |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="10%" | |
| 54 ALIGN="right" | |
| 55 VALIGN="bottom" | |
| 56 > </TD | |
| 57 ></TR | |
| 58 ></TABLE | |
| 59 ><HR | |
| 60 ALIGN="LEFT" | |
| 61 WIDTH="100%"></DIV | |
| 62 ><H1 | |
| 63 ><A | |
| 64 NAME="SDLSETTIMER" | |
| 65 >SDL_SetTimer</A | |
| 66 ></H1 | |
| 67 ><DIV | |
| 68 CLASS="REFNAMEDIV" | |
| 69 ><A | |
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70 NAME="AEN8169" |
| 0 | 71 ></A |
| 72 ><H2 | |
| 73 >Name</H2 | |
| 74 >SDL_SetTimer -- Set a callback to run after the specified number of milliseconds has | |
| 75 elapsed.</DIV | |
| 76 ><DIV | |
| 77 CLASS="REFSYNOPSISDIV" | |
| 78 ><A | |
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79 NAME="AEN8172" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Synopsis</H2 | |
| 83 ><DIV | |
| 84 CLASS="FUNCSYNOPSIS" | |
| 85 ><A | |
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86 NAME="AEN8173" |
| 0 | 87 ></A |
| 88 ><P | |
| 89 ></P | |
| 90 ><PRE | |
| 91 CLASS="FUNCSYNOPSISINFO" | |
| 92 >#include "SDL.h"</PRE | |
| 93 ><P | |
| 94 ><CODE | |
| 95 ><CODE | |
| 96 CLASS="FUNCDEF" | |
| 97 >int <B | |
| 98 CLASS="FSFUNC" | |
| 99 >SDL_SetTimer</B | |
| 100 ></CODE | |
| 101 >(Uint32 interval, SDL_TimerCallback callback);</CODE | |
| 102 ></P | |
| 103 ><P | |
| 104 ></P | |
| 105 ></DIV | |
| 106 ></DIV | |
| 107 ><DIV | |
| 108 CLASS="REFSECT1" | |
| 109 ><A | |
| 110 NAME="SDLTIMERCALLBACK" | |
| 111 ></A | |
| 112 ><H2 | |
| 113 >Callback</H2 | |
| 114 ><P | |
| 115 >/* Function prototype for the timer callback function */ | |
| 116 typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);</P | |
| 117 ></DIV | |
| 118 ><DIV | |
| 119 CLASS="REFSECT1" | |
| 120 ><A | |
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121 NAME="AEN8182" |
| 0 | 122 ></A |
| 123 ><H2 | |
| 124 >Description</H2 | |
| 125 ><P | |
| 126 >Set a callback to run after the specified number of milliseconds has | |
| 127 elapsed. The callback function is passed the current timer interval | |
| 128 and returns the next timer interval. If the returned value is the | |
| 129 same as the one passed in, the periodic alarm continues, otherwise a | |
| 130 new alarm is scheduled.</P | |
| 131 ><P | |
| 132 >To cancel a currently running timer, call | |
| 133 <TT | |
| 134 CLASS="FUNCTION" | |
| 135 >SDL_SetTimer(0, NULL);</TT | |
| 136 ></P | |
| 137 ><P | |
| 138 >The timer callback function may run in a different thread than your | |
| 139 main constant, and so shouldn't call any functions from within itself.</P | |
| 140 ><P | |
| 141 >The maximum resolution of this timer is 10 ms, which means that if | |
| 142 you request a 16 ms timer, your callback will run approximately 20 ms | |
| 143 later on an unloaded system. If you wanted to set a flag signaling | |
| 144 a frame update at 30 frames per second (every 33 ms), you might set a | |
| 145 timer for 30 ms (see example below).</P | |
| 146 ><P | |
| 147 >If you use this function, you need to pass <TT | |
| 148 CLASS="LITERAL" | |
| 149 >SDL_INIT_TIMER</TT | |
| 150 > | |
| 151 to <TT | |
| 152 CLASS="FUNCTION" | |
| 153 >SDL_Init()</TT | |
| 154 >.</P | |
| 155 ><DIV | |
| 156 CLASS="NOTE" | |
| 157 ><BLOCKQUOTE | |
| 158 CLASS="NOTE" | |
| 159 ><P | |
| 160 ><B | |
| 161 >Note: </B | |
|
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162 >This function is kept for compatibility but has been superseded |
| 0 | 163 by the new timer functions |
| 164 <A | |
| 165 HREF="sdladdtimer.html" | |
| 166 >SDL_AddTimer</A | |
| 167 > and | |
| 168 <A | |
| 169 HREF="sdlremovetimer.html" | |
| 170 >SDL_RemoveTimer</A | |
| 171 > which support | |
| 172 multiple timers.</P | |
| 173 ></BLOCKQUOTE | |
| 174 ></DIV | |
| 175 ></DIV | |
| 176 ><DIV | |
| 177 CLASS="REFSECT1" | |
| 178 ><A | |
|
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179 NAME="AEN8196" |
| 0 | 180 ></A |
| 181 ><H2 | |
| 182 >Examples</H2 | |
| 183 ><P | |
| 184 ><PRE | |
| 185 CLASS="PROGRAMLISTING" | |
| 186 >SDL_SetTimer((33/10)*10, my_callback);</PRE | |
| 187 ></P | |
| 188 ></DIV | |
| 189 ><DIV | |
| 190 CLASS="REFSECT1" | |
| 191 ><A | |
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192 NAME="AEN8200" |
| 0 | 193 ></A |
| 194 ><H2 | |
| 195 >See Also</H2 | |
| 196 ><P | |
| 197 ><A | |
| 198 HREF="sdladdtimer.html" | |
| 199 ><TT | |
| 200 CLASS="FUNCTION" | |
| 201 >SDL_AddTimer</TT | |
| 202 ></A | |
| 203 ></P | |
| 204 ></DIV | |
| 205 ><DIV | |
| 206 CLASS="NAVFOOTER" | |
| 207 ><HR | |
| 208 ALIGN="LEFT" | |
| 209 WIDTH="100%"><TABLE | |
| 210 WIDTH="100%" | |
| 211 BORDER="0" | |
| 212 CELLPADDING="0" | |
| 213 CELLSPACING="0" | |
| 214 ><TR | |
| 215 ><TD | |
| 216 WIDTH="33%" | |
| 217 ALIGN="left" | |
| 218 VALIGN="top" | |
| 219 ><A | |
| 220 HREF="sdlremovetimer.html" | |
| 221 >Prev</A | |
| 222 ></TD | |
| 223 ><TD | |
| 224 WIDTH="34%" | |
| 225 ALIGN="center" | |
| 226 VALIGN="top" | |
| 227 ><A | |
| 228 HREF="index.html" | |
| 229 >Home</A | |
| 230 ></TD | |
| 231 ><TD | |
| 232 WIDTH="33%" | |
| 233 ALIGN="right" | |
| 234 VALIGN="top" | |
| 235 > </TD | |
| 236 ></TR | |
| 237 ><TR | |
| 238 ><TD | |
| 239 WIDTH="33%" | |
| 240 ALIGN="left" | |
| 241 VALIGN="top" | |
| 242 >SDL_RemoveTimer</TD | |
| 243 ><TD | |
| 244 WIDTH="34%" | |
| 245 ALIGN="center" | |
| 246 VALIGN="top" | |
| 247 ><A | |
| 248 HREF="time.html" | |
| 249 >Up</A | |
| 250 ></TD | |
| 251 ><TD | |
| 252 WIDTH="33%" | |
| 253 ALIGN="right" | |
| 254 VALIGN="top" | |
| 255 > </TD | |
| 256 ></TR | |
| 257 ></TABLE | |
| 258 ></DIV | |
| 259 ></BODY | |
| 260 ></HTML | |
| 261 > |