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symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/guideeventexamples.html
author Mike Kinghan <mikek@symbian.org>
Thu, 25 Nov 2010 14:28:39 +0000
branchGCC_SURGE
changeset 135 10852f1a0ae9
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Merge a pointless head that got away.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<HTML
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><HEAD
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><TITLE
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>Event Examples</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Examples"
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HREF="guideexamples.html"><LINK
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REL="PREVIOUS"
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TITLE="Examples"
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HREF="guideexamples.html"><LINK
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REL="NEXT"
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TITLE="Audio Examples"
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HREF="guideaudioexamples.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="guideexamples.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 4. Examples</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="guideaudioexamples.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="GUIDEEVENTEXAMPLES"
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></A
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>Event Examples</H1
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><P
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></P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN375"
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></A
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>Filtering and Handling Events</H2
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><P
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><PRE
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CLASS="PROGRAMLISTING"
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>#include &#60;stdio.h&#62;
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#include &#60;stdlib.h&#62;
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    95


#include "SDL.h"













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    96














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/* This function may run in a separate event thread */













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    98


int FilterEvents(const SDL_Event *event) {













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    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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        printf("Quit event filtered out -- try again.\n");













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        boycott = 0;













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   105


        return(0);













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   106


    }













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    if ( event-&#62;type == SDL_MOUSEMOTION ) {













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        printf("Mouse moved to (%d,%d)\n",













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                event-&#62;motion.x, event-&#62;motion.y);













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        return(0);    /* Drop it, we've handled it */













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   111


    }













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    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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{













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    SDL_Event event;













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   118














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    /* 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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Initial QEMU (symbian-qemu-0.9.1-12) import



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   187


WIDTH="100%"><TABLE













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changeset




   188


SUMMARY="Footer navigation table"













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changeset




   189


WIDTH="100%"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   190


BORDER="0"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
changeset




   191


CELLPADDING="0"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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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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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   196


ALIGN="left"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   197


VALIGN="top"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   198


><A













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   199


HREF="guideexamples.html"













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   200


ACCESSKEY="P"













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changeset




   201


>Prev</A













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changeset




   202


></TD













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changeset




   203


><TD













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   204


WIDTH="34%"













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   205


ALIGN="center"













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changeset




   206


VALIGN="top"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   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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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   212


><TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   213


WIDTH="33%"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   214


ALIGN="right"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   215


VALIGN="top"













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changeset




   216


><A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   217


HREF="guideaudioexamples.html"













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diff
changeset




   218


ACCESSKEY="N"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
changeset




   219


>Next</A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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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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changeset




   230


ALIGN="center"













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changeset




   231


VALIGN="top"













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   232


><A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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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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