annotate docs/html/guideeventexamples.html @ 2096:87256df87837

Merge r2990:2991 from branches/SDL-1.2: try to avoid asm/page.h in fbcon.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 14 Mar 2007 01:10:43 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >Event Examples</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="Examples"
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14 HREF="guideexamples.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Examples"
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17 HREF="guideexamples.html"><LINK
0
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18 REL="NEXT"
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19 TITLE="Audio Examples"
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20 HREF="guideaudioexamples.html"></HEAD
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21 ><BODY
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22 CLASS="SECT1"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
0
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="guideexamples.html"
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49 ACCESSKEY="P"
0
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 >Chapter 4. Examples</TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="guideaudioexamples.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><DIV
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72 CLASS="SECT1"
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73 ><H1
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74 CLASS="SECT1"
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75 ><A
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76 NAME="GUIDEEVENTEXAMPLES"
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77 ></A
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78 >Event Examples</H1
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79 ><P
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80 ></P
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81 ><DIV
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82 CLASS="SECT2"
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83 ><H2
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84 CLASS="SECT2"
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85 ><A
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86 NAME="AEN375"
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87 ></A
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88 >Filtering and Handling Events</H2
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89 ><P
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90 ><PRE
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91 CLASS="PROGRAMLISTING"
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92 >#include &#60;stdio.h&#62;
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93 #include &#60;stdlib.h&#62;
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94
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95 #include "SDL.h"
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96
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97 /* This function may run in a separate event thread */
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98 int FilterEvents(const SDL_Event *event) {
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99 static int boycott = 1;
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100
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101 /* This quit event signals the closing of the window */
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102 if ( (event-&#62;type == SDL_QUIT) &#38;&#38; boycott ) {
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103 printf("Quit event filtered out -- try again.\n");
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104 boycott = 0;
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105 return(0);
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106 }
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107 if ( event-&#62;type == SDL_MOUSEMOTION ) {
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108 printf("Mouse moved to (%d,%d)\n",
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109 event-&#62;motion.x, event-&#62;motion.y);
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110 return(0); /* Drop it, we've handled it */
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111 }
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112 return(1);
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113 }
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114
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115 int main(int argc, char *argv[])
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116 {
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117 SDL_Event event;
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118
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119 /* Initialize the SDL library (starts the event loop) */
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120 if ( SDL_Init(SDL_INIT_VIDEO) &#60; 0 ) {
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121 fprintf(stderr,
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122 "Couldn't initialize SDL: %s\n", SDL_GetError());
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123 exit(1);
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124 }
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125
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126 /* Clean up on exit, exit on window close and interrupt */
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127 atexit(SDL_Quit);
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128
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129 /* Ignore key events */
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130 SDL_EventState(SDL_KEYDOWN, SDL_IGNORE);
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131 SDL_EventState(SDL_KEYUP, SDL_IGNORE);
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132
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133 /* Filter quit and mouse motion events */
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134 SDL_SetEventFilter(FilterEvents);
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135
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136 /* The mouse isn't much use unless we have a display for reference */
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137 if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) {
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138 fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n",
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139 SDL_GetError());
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140 exit(1);
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141 }
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142
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143 /* Loop waiting for ESC+Mouse_Button */
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144 while ( SDL_WaitEvent(&#38;event) &#62;= 0 ) {
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145 switch (event.type) {
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146 case SDL_ACTIVEEVENT: {
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147 if ( event.active.state &#38; SDL_APPACTIVE ) {
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148 if ( event.active.gain ) {
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149 printf("App activated\n");
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150 } else {
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151 printf("App iconified\n");
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152 }
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153 }
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154 }
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155 break;
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156
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157 case SDL_MOUSEBUTTONDOWN: {
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158 Uint8 *keys;
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159
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160 keys = SDL_GetKeyState(NULL);
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161 if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) {
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162 printf("Bye bye...\n");
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163 exit(0);
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164 }
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165 printf("Mouse button pressed\n");
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166 }
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167 break;
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168
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169 case SDL_QUIT: {
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170 printf("Quit requested, quitting.\n");
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171 exit(0);
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172 }
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173 break;
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174 }
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175 }
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176 /* This should never happen */
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177 printf("SDL_WaitEvent error: %s\n", SDL_GetError());
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178 exit(1);
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179 }</PRE
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180 ></P
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181 ></DIV
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182 ></DIV
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183 ><DIV
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184 CLASS="NAVFOOTER"
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185 ><HR
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186 ALIGN="LEFT"
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187 WIDTH="100%"><TABLE
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188 SUMMARY="Footer navigation table"
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189 WIDTH="100%"
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190 BORDER="0"
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191 CELLPADDING="0"
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192 CELLSPACING="0"
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193 ><TR
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194 ><TD
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195 WIDTH="33%"
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196 ALIGN="left"
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197 VALIGN="top"
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198 ><A
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199 HREF="guideexamples.html"
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200 ACCESSKEY="P"
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201 >Prev</A
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202 ></TD
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203 ><TD
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204 WIDTH="34%"
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205 ALIGN="center"
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206 VALIGN="top"
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207 ><A
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208 HREF="index.html"
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209 ACCESSKEY="H"
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210 >Home</A
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211 ></TD
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212 ><TD
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213 WIDTH="33%"
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214 ALIGN="right"
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215 VALIGN="top"
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216 ><A
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217 HREF="guideaudioexamples.html"
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218 ACCESSKEY="N"
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219 >Next</A
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220 ></TD
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221 ></TR
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222 ><TR
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223 ><TD
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224 WIDTH="33%"
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225 ALIGN="left"
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226 VALIGN="top"
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227 >Examples</TD
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228 ><TD
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229 WIDTH="34%"
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230 ALIGN="center"
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231 VALIGN="top"
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232 ><A
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233 HREF="guideexamples.html"
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234 ACCESSKEY="U"
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235 >Up</A
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236 ></TD
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237 ><TD
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238 WIDTH="33%"
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239 ALIGN="right"
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240 VALIGN="top"
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241 >Audio Examples</TD
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242 ></TR
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243 ></TABLE
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244 ></DIV
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245 ></BODY
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246 ></HTML
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247 >