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annotate docs/html/guidebasicsinit.html @ 673:63419da96d13
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 08 Aug 2003 21:39:12 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >Initializing SDL</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="The Basics" | |
| 14 HREF="guidethebasics.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="The Basics" | |
| 17 HREF="guidethebasics.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="Graphics and Video" | |
| 20 HREF="guidevideo.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="SECT1" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="guidethebasics.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 >Chapter 1. The Basics</TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="guidevideo.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><DIV | |
| 69 CLASS="SECT1" | |
| 70 ><H1 | |
| 71 CLASS="SECT1" | |
| 72 ><A | |
| 73 NAME="GUIDEBASICSINIT" | |
| 74 >Initializing SDL</A | |
| 75 ></H1 | |
| 76 ><P | |
| 77 >SDL is composed of eight subsystems - Audio, CDROM, Event Handling, File I/O, Joystick Handling, Threading, Timers and Video. Before you can use any of these subsystems they must be initialized by calling <A | |
| 78 HREF="sdlinit.html" | |
| 79 ><TT | |
| 80 CLASS="FUNCTION" | |
| 81 >SDL_Init</TT | |
| 82 ></A | |
| 83 > (or <A | |
| 84 HREF="sdlinitsubsystem.html" | |
| 85 ><TT | |
| 86 CLASS="FUNCTION" | |
| 87 >SDL_InitSubSystem</TT | |
| 88 ></A | |
|
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89 >). <TT |
| 0 | 90 CLASS="FUNCTION" |
| 91 >SDL_Init</TT | |
| 92 > must be called before any other SDL function. It automatically initializes the Event Handling, File I/O and Threading subsystems and it takes a parameter specifying which other subsystems to initialize. So, to initialize the default subsystems and the Video subsystems you would call: | |
| 93 <PRE | |
| 94 CLASS="PROGRAMLISTING" | |
| 95 > SDL_Init ( SDL_INIT_VIDEO );</PRE | |
| 96 > | |
| 97 To initialize the default subsystems, the Video subsystem and the Timers subsystem you would call: | |
| 98 <PRE | |
| 99 CLASS="PROGRAMLISTING" | |
| 100 > SDL_Init ( SDL_INIT_VIDEO | SDL_INIT_TIMER );</PRE | |
| 101 ></P | |
| 102 ><P | |
| 103 ><TT | |
| 104 CLASS="FUNCTION" | |
| 105 >SDL_Init</TT | |
| 106 > is complemented by <A | |
| 107 HREF="sdlquit.html" | |
| 108 ><TT | |
| 109 CLASS="FUNCTION" | |
| 110 >SDL_Quit</TT | |
| 111 ></A | |
| 112 > (and <A | |
| 113 HREF="sdlquitsubsystem.html" | |
| 114 ><TT | |
| 115 CLASS="FUNCTION" | |
| 116 >SDL_QuitSubSystem</TT | |
| 117 ></A | |
| 118 >). <TT | |
| 119 CLASS="FUNCTION" | |
| 120 >SDL_Quit</TT | |
| 121 > shuts down all subsystems, including the default ones. It should always be called before a SDL application exits.</P | |
| 122 ><P | |
| 123 >With <TT | |
| 124 CLASS="FUNCTION" | |
| 125 >SDL_Init</TT | |
| 126 > and <TT | |
| 127 CLASS="FUNCTION" | |
| 128 >SDL_Quit</TT | |
| 129 > firmly embedded in your programmers toolkit you can write your first and most basic SDL application. However, we must be prepare to handle errors. Many SDL functions return a value and indicates whether the function has succeeded or failed, <TT | |
| 130 CLASS="FUNCTION" | |
| 131 >SDL_Init</TT | |
| 132 >, for instance, returns -1 if it could not initialize a subsystem. SDL provides a useful facility that allows you to determine exactly what the problem was, every time an error occurs within SDL an error message is stored which can be retrieved using <TT | |
| 133 CLASS="FUNCTION" | |
| 134 >SDL_GetError</TT | |
| 135 >. Use this often, you can never know too much about an error.</P | |
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136 ><DIV |
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137 CLASS="EXAMPLE" |
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138 ><A |
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139 NAME="AEN60" |
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140 ></A |
| 0 | 141 ><P |
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142 ><B |
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143 >Example 1-1. Initializing SDL</B |
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144 ></P |
| 0 | 145 ><PRE |
| 146 CLASS="PROGRAMLISTING" | |
| 147 >#include "SDL.h" /* All SDL App's need this */ | |
| 148 #include <stdio.h> | |
| 149 | |
| 150 int main() { | |
| 151 | |
| 152 printf("Initializing SDL.\n"); | |
| 153 | |
| 154 /* Initialize defaults, Video and Audio */ | |
| 155 if((SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO)==-1)) { | |
| 156 printf("Could not initialize SDL: %s.\n", SDL_GetError()); | |
| 157 exit(-1); | |
| 158 } | |
| 159 | |
| 160 printf("SDL initialized.\n"); | |
| 161 | |
| 162 printf("Quiting SDL.\n"); | |
| 163 | |
| 164 /* Shutdown all subsystems */ | |
| 165 SDL_Quit(); | |
| 166 | |
| 167 printf("Quiting....\n"); | |
| 168 | |
| 169 exit(0); | |
| 170 } </PRE | |
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171 ></DIV |
| 0 | 172 ></DIV |
| 173 ><DIV | |
| 174 CLASS="NAVFOOTER" | |
| 175 ><HR | |
| 176 ALIGN="LEFT" | |
| 177 WIDTH="100%"><TABLE | |
| 178 WIDTH="100%" | |
| 179 BORDER="0" | |
| 180 CELLPADDING="0" | |
| 181 CELLSPACING="0" | |
| 182 ><TR | |
| 183 ><TD | |
| 184 WIDTH="33%" | |
| 185 ALIGN="left" | |
| 186 VALIGN="top" | |
| 187 ><A | |
| 188 HREF="guidethebasics.html" | |
| 189 >Prev</A | |
| 190 ></TD | |
| 191 ><TD | |
| 192 WIDTH="34%" | |
| 193 ALIGN="center" | |
| 194 VALIGN="top" | |
| 195 ><A | |
| 196 HREF="index.html" | |
| 197 >Home</A | |
| 198 ></TD | |
| 199 ><TD | |
| 200 WIDTH="33%" | |
| 201 ALIGN="right" | |
| 202 VALIGN="top" | |
| 203 ><A | |
| 204 HREF="guidevideo.html" | |
| 205 >Next</A | |
| 206 ></TD | |
| 207 ></TR | |
| 208 ><TR | |
| 209 ><TD | |
| 210 WIDTH="33%" | |
| 211 ALIGN="left" | |
| 212 VALIGN="top" | |
| 213 >The Basics</TD | |
| 214 ><TD | |
| 215 WIDTH="34%" | |
| 216 ALIGN="center" | |
| 217 VALIGN="top" | |
| 218 ><A | |
| 219 HREF="guidethebasics.html" | |
| 220 >Up</A | |
| 221 ></TD | |
| 222 ><TD | |
| 223 WIDTH="33%" | |
| 224 ALIGN="right" | |
| 225 VALIGN="top" | |
| 226 >Graphics and Video</TD | |
| 227 ></TR | |
| 228 ></TABLE | |
| 229 ></DIV | |
| 230 ></BODY | |
| 231 ></HTML | |
| 232 > |