= Example 4: a more complex application =

In this application, volunteers locate fossils in images of desert terrain.
They can locate several (zero or more) fossils in the same image,
and can associate a type and a comment with each annotation.
They can remove existing annotations.
When they're all done, they click a "Done" button.

This is implemented as a sequence of web pages;
each addition or deletion of an annotation goes to a new web page.
Hence, in addition to the '''job_show()''' callback function,
the application uses a separate web page, '''user/bossa_example4.php''',
that handles the edit operations.

The application is implemented by three scripts in ~/projects/test/html/:

 * [source:/trunk/boinc/html/ops/bossa_example4_make_jobs.php ops/bossa_example4_make_jobs.php]: a script that creates jobs.
 * [source:/trunk/boinc/html/inc/bossa_example4.inc inc/bossa_example4.inc]: the application's callback functions.
 * [source:/trunk/boinc/html/user/bossa_example4.php user/bossa_example4.php]: the handler for editing operations.

== Creating jobs ==

Using the administrative interface, create an application named "bossa_example4".
Create a directory '''~/projects/test/html/user/example4_images'''.
Put some images (.png or .jpg) there; a good source is
http://isaac.ssl.berkeley.edu/test/example4_images/

Now go to the project's ops/ directory and type

{{{
php bossa_example4_make_jobs.php --dir example4_images
}}}

==