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  56 >Chapter 4. Examples</TD
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  73 ><H1
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  76 NAME="GUIDECDROMEXAMPLES"
  77 ></A
  78 >CDROM Examples</H1
  79 ><P
  80 ></P
  81 ><DIV
  82 CLASS="SECT2"
  83 ><H2
  84 CLASS="SECT2"
  85 ><A
  86 NAME="AEN393"
  87 ></A
  88 >Listing CD-ROM drives</H2
  89 ><P
  90 ><PRE
  91 CLASS="PROGRAMLISTING"
  92 >    #include "SDL.h"
  93
  94     /* Initialize SDL first */
  95     if ( SDL_Init(SDL_INIT_CDROM) &#60; 0 ) {
  96         fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
  97         exit(1);
  98     }
  99     atexit(SDL_Quit);
 100
 101     /* Find out how many CD-ROM drives are connected to the system */
 102     printf("Drives available: %d\n", SDL_CDNumDrives());
 103     for ( i=0; i&#60;SDL_CDNumDrives(); ++i ) {
 104         printf("Drive %d:  \"%s\"\n", i, SDL_CDName(i));
 105     }</PRE
 106 ></P
 107 ></DIV
 108 ><DIV
 109 CLASS="SECT2"
 110 ><H2
 111 CLASS="SECT2"
 112 ><A
 113 NAME="AEN397"
 114 ></A
 115 >Opening the default drive</H2
 116 ><P
 117 ><PRE
 118 CLASS="PROGRAMLISTING"
 119 >    SDL_CD *cdrom;
 120     CDstatus status;
 121     char *status_str;
 122
 123     cdrom = SDL_CDOpen(0);
 124     if ( cdrom == NULL ) {
 125         fprintf(stderr, "Couldn't open default CD-ROM drive: %s\n",
 126                         SDL_GetError());
 127         exit(2);
 128     }
 129
 130     status = SDL_CDStatus(cdrom);
 131     switch (status) {
 132         case CD_TRAYEMPTY:
 133             status_str = "tray empty";
 134             break;
 135         case CD_STOPPED:
 136             status_str = "stopped";
 137             break;
 138         case CD_PLAYING:
 139             status_str = "playing";
 140             break;
 141         case CD_PAUSED:
 142             status_str = "paused";
 143             break;
 144         case CD_ERROR:
 145             status_str = "error state";
 146             break;
 147     }
 148     printf("Drive status: %s\n", status_str);
 149     if ( status &#62;= CD_PLAYING ) {
 150         int m, s, f;
 151         FRAMES_TO_MSF(cdrom-&#62;cur_frame, &#38;m, &#38;s, &#38;f);
 152         printf("Currently playing track %d, %d:%2.2d\n",
 153         cdrom-&#62;track[cdrom-&#62;cur_track].id, m, s);
 154     }</PRE
 155 ></P
 156 ></DIV
 157 ><DIV
 158 CLASS="SECT2"
 159 ><H2
 160 CLASS="SECT2"
 161 ><A
 162 NAME="AEN401"
 163 ></A
 164 >Listing the tracks on a CD</H2
 165 ><P
 166 ><PRE
 167 CLASS="PROGRAMLISTING"
 168 >    SDL_CD *cdrom;          /* Assuming this has already been set.. */
 169     int i;
 170     int m, s, f;
 171
 172     SDL_CDStatus(cdrom);
 173     printf("Drive tracks: %d\n", cdrom-&#62;numtracks);
 174     for ( i=0; i&#60;cdrom-&#62;numtracks; ++i ) {
 175         FRAMES_TO_MSF(cdrom-&#62;track[i].length, &#38;m, &#38;s, &#38;f);
 176         if ( f &#62; 0 )
 177             ++s;
 178         printf("\tTrack (index %d) %d: %d:%2.2d\n", i,
 179         cdrom-&#62;track[i].id, m, s);
 180     }</PRE
 181 ></P
 182 ></DIV
 183 ><DIV
 184 CLASS="SECT2"
 185 ><H2
 186 CLASS="SECT2"
 187 ><A
 188 NAME="AEN405"
 189 ></A
 190 >Play an entire CD</H2
 191 ><P
 192 ><PRE
 193 CLASS="PROGRAMLISTING"
 194 >    SDL_CD *cdrom;          /* Assuming this has already been set.. */
 195
 196     // Play entire CD:
 197     if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
 198         SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);
 199
 200         // Play last track:
 201         if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) {
 202             SDL_CDPlayTracks(cdrom, cdrom-&#62;numtracks-1, 0, 0, 0);
 203         }
 204
 205         // Play first and second track and 10 seconds of third track:
 206         if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
 207             SDL_CDPlayTracks(cdrom, 0, 0, 2, CD_FPS * 10);</PRE
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