annotate docs/html/sdlsettimer.html @ 4159:a1b03ba2fcd0 SDL-1.2

Updated copyright date
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 Dec 2008 00:25:42 +0000
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_SetTimer</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Time"
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14 HREF="time.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_RemoveTimer"
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17 HREF="sdlremovetimer.html"></HEAD
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18 ><BODY
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19 CLASS="REFENTRY"
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20 BGCOLOR="#FFF8DC"
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21 TEXT="#000000"
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22 LINK="#0000ee"
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23 VLINK="#551a8b"
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24 ALINK="#ff0000"
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25 ><DIV
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26 CLASS="NAVHEADER"
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27 ><TABLE
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28 SUMMARY="Header navigation table"
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29 WIDTH="100%"
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30 BORDER="0"
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31 CELLPADDING="0"
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32 CELLSPACING="0"
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33 ><TR
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34 ><TH
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35 COLSPAN="3"
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36 ALIGN="center"
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37 >SDL Library Documentation</TH
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38 ></TR
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39 ><TR
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40 ><TD
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41 WIDTH="10%"
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42 ALIGN="left"
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43 VALIGN="bottom"
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44 ><A
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45 HREF="sdlremovetimer.html"
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46 ACCESSKEY="P"
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47 >Prev</A
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48 ></TD
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49 ><TD
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50 WIDTH="80%"
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51 ALIGN="center"
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52 VALIGN="bottom"
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53 ></TD
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54 ><TD
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55 WIDTH="10%"
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56 ALIGN="right"
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57 VALIGN="bottom"
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58 >&nbsp;</TD
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59 ></TR
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60 ></TABLE
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61 ><HR
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62 ALIGN="LEFT"
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63 WIDTH="100%"></DIV
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64 ><H1
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65 ><A
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66 NAME="SDLSETTIMER"
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67 ></A
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68 >SDL_SetTimer</H1
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69 ><DIV
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70 CLASS="REFNAMEDIV"
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71 ><A
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72 NAME="AEN8557"
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73 ></A
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74 ><H2
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75 >Name</H2
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76 >SDL_SetTimer&nbsp;--&nbsp;Set a callback to run after the specified number of milliseconds has
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77 elapsed.</DIV
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78 ><DIV
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79 CLASS="REFSYNOPSISDIV"
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80 ><A
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81 NAME="AEN8560"
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82 ></A
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83 ><H2
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84 >Synopsis</H2
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85 ><DIV
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86 CLASS="FUNCSYNOPSIS"
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87 ><A
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88 NAME="AEN8561"
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89 ></A
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90 ><P
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91 ></P
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92 ><PRE
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93 CLASS="FUNCSYNOPSISINFO"
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94 >#include "SDL.h"</PRE
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95 ><P
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96 ><CODE
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97 ><CODE
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98 CLASS="FUNCDEF"
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99 >int <B
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100 CLASS="FSFUNC"
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101 >SDL_SetTimer</B
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102 ></CODE
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103 >(Uint32 interval, SDL_TimerCallback callback);</CODE
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104 ></P
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105 ><P
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106 ></P
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107 ></DIV
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108 ></DIV
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109 ><DIV
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110 CLASS="REFSECT1"
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111 ><A
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112 NAME="SDLTIMERCALLBACK"
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113 ></A
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114 ><H2
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115 >Callback</H2
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116 ><P
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117 >/* Function prototype for the timer callback function */
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118 typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);</P
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119 ></DIV
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120 ><DIV
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121 CLASS="REFSECT1"
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122 ><A
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123 NAME="AEN8570"
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124 ></A
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125 ><H2
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126 >Description</H2
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127 ><P
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128 >Set a callback to run after the specified number of milliseconds has
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129 elapsed. The callback function is passed the current timer interval
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130 and returns the next timer interval. If the returned value is the
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131 same as the one passed in, the periodic alarm continues, otherwise a
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132 new alarm is scheduled.</P
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133 ><P
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134 >To cancel a currently running timer, call
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135 <TT
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136 CLASS="FUNCTION"
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137 >SDL_SetTimer(0, NULL);</TT
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138 ></P
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139 ><P
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140 >The timer callback function may run in a different thread than your
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141 main constant, and so shouldn't call any functions from within itself.</P
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142 ><P
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143 >The maximum resolution of this timer is 10 ms, which means that if
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144 you request a 16 ms timer, your callback will run approximately 20 ms
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145 later on an unloaded system. If you wanted to set a flag signaling
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146 a frame update at 30 frames per second (every 33 ms), you might set a
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147 timer for 30 ms (see example below).</P
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148 ><P
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149 >If you use this function, you need to pass <TT
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150 CLASS="LITERAL"
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151 >SDL_INIT_TIMER</TT
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152 >
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153 to <TT
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154 CLASS="FUNCTION"
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155 >SDL_Init()</TT
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156 >.</P
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157 ><DIV
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158 CLASS="NOTE"
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159 ><BLOCKQUOTE
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160 CLASS="NOTE"
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161 ><P
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162 ><B
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163 >Note: </B
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164 >This function is kept for compatibility but has been superseded
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165 by the new timer functions
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166 <A
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167 HREF="sdladdtimer.html"
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168 >SDL_AddTimer</A
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169 > and
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170 <A
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171 HREF="sdlremovetimer.html"
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172 >SDL_RemoveTimer</A
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173 > which support
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174 multiple timers.</P
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175 ></BLOCKQUOTE
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176 ></DIV
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177 ></DIV
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178 ><DIV
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179 CLASS="REFSECT1"
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180 ><A
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181 NAME="AEN8584"
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182 ></A
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183 ><H2
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184 >Examples</H2
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185 ><P
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186 ><PRE
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187 CLASS="PROGRAMLISTING"
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188 >SDL_SetTimer((33/10)*10, my_callback);</PRE
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189 ></P
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190 ></DIV
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191 ><DIV
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192 CLASS="REFSECT1"
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193 ><A
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194 NAME="AEN8588"
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195 ></A
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196 ><H2
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197 >See Also</H2
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198 ><P
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199 ><A
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200 HREF="sdladdtimer.html"
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201 ><TT
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202 CLASS="FUNCTION"
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203 >SDL_AddTimer</TT
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204 ></A
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205 ></P
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206 ></DIV
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207 ><DIV
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208 CLASS="NAVFOOTER"
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209 ><HR
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210 ALIGN="LEFT"
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211 WIDTH="100%"><TABLE
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212 SUMMARY="Footer navigation table"
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213 WIDTH="100%"
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214 BORDER="0"
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215 CELLPADDING="0"
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216 CELLSPACING="0"
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217 ><TR
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218 ><TD
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219 WIDTH="33%"
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220 ALIGN="left"
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221 VALIGN="top"
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222 ><A
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223 HREF="sdlremovetimer.html"
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224 ACCESSKEY="P"
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225 >Prev</A
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226 ></TD
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227 ><TD
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228 WIDTH="34%"
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229 ALIGN="center"
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230 VALIGN="top"
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231 ><A
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232 HREF="index.html"
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233 ACCESSKEY="H"
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234 >Home</A
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235 ></TD
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236 ><TD
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237 WIDTH="33%"
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238 ALIGN="right"
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239 VALIGN="top"
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240 >&nbsp;</TD
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241 ></TR
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242 ><TR
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243 ><TD
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244 WIDTH="33%"
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245 ALIGN="left"
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246 VALIGN="top"
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247 >SDL_RemoveTimer</TD
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248 ><TD
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249 WIDTH="34%"
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250 ALIGN="center"
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251 VALIGN="top"
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252 ><A
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253 HREF="time.html"
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254 ACCESSKEY="U"
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255 >Up</A
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256 ></TD
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257 ><TD
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258 WIDTH="33%"
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259 ALIGN="right"
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260 VALIGN="top"
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261 >&nbsp;</TD
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262 ></TR
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263 ></TABLE
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264 ></DIV
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265 ></BODY
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266 ></HTML
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267 >