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In this example, the passed values are 26 for the font size, 8 for the length of the Captcha word required, captchattf for the name of a TrueType file to use, '' for the image folder to use, and !*a&K and fs !+ for the two salt values You should have already uploaded a suitable TrueType font file, named captchattf, to your server preferably a nonstandard or script type font The plug-in will return an array of three values with which you can display the Captcha image, and create a form to request the Captcha word as text input The first of the returned values is the Captcha word itself and you don t actually need it other than for testing purposes So at this point let s forget it and concentrate on the other two returned values The first of these is the image that you need to display, like this:

Each row in this table is uniquely identified by the jobid B, which is an autoincrementing integer field. The identifier field C corresponds to the user ID/email of the assigned mobile technician. The producturl field D is designed to be a specific URL to assist the mobile technician in the field in quickly gaining access to helpful information for completing the assigned job. The next section provides a road map to the server code.

6:

The server-side dispatcher system is written in PHP and contains a number of files working together to create the application. Table 12.3 presents a brief synopsis of each source file to help you navigate the application if you choose to host a version of it yourself.

' ' ' '

Table 12.3 Server-side source code Description Form for entering new job information Used by Android application to submit signature Database connection information Used to export list of jobs to a CSV file Used to create a consistent look and feel for the footer of each page Used by the Android application to request a job XML stream Used to create a consistent look and feel for the header of each page Home page, including the search form Used to delete jobs on the web application Used to save a new job (called from addjob.php) Used to display job details and load into a form for updating Displays all jobs for a particular user

You also need to embed the image URL in a hidden form field so that it can be passed to the following function where it will be erased from the hard disk when no longer needed At the same time, you should embed the value of the token in another hidden field, like this:

Source file addjob.php closejob.php db.php export.php footer.php getjoblist.php header.php index.php manage.php savejob.php showjob.php showjobs.php

data byte to be transmitted to the LED MAX register that receives the data byte We're breaking a rule here! (See text) used in for-next loop

<input type="hidden" name="token" value="$result[1]" /> <input type="hidden" name="image" value="$result[2]" />

Server-side source code (continued) Description Used to save updates to a job Contains various routines for interacting with the database

Taking all this into account, the following example code creates a Captcha, and then displays the Captcha image along with a form for requesting the Captcha word to be entered:

Of all these files, only two concern the Android application. We ll discuss them in the next section.

' ============================== Begin Main Program ============================= setfreq m8 dirsC = %00010111 ' Initialize MAX7219 maxReg = scan outByte = 3 gosub shout16 maxReg = brite outByte = 5 gosub shout16 maxReg = decode outByte = 15 gosub shout16 maxReg = on_off outByte = 1 gosub shout16 ' Send data to the four digits maxReg = 1

< php $result = PIPHP_CreateCaptcha(26, 8, 'captchattf', '', '!*a&K', 'fs !+'); echo <<<_END <img src="$result[2]" /><br /> Please enter the word shown<br /> <form method="post" action="checkcaptchaphp"> <input type="hidden" name="token" value="$result[1]" /> <input type="text" name="captcha" /> <input type="submit" /> </form> _END;

When the Android application runs the RefreshJobs Activity, the server side generates an XML stream. Without going into excessive detail on the server-side code, we explain the getjoblist.php file in the following listing.

' set scan limit for digits 0-3

< require('db.php'); require('utils.php'); $theuser = $_GET['identifier']; print (getJobsXML($theuser)); >

You may wish to save this example (giving it a filename such as testcaptchaphp) as you ll be able to test it with an example from the following plug-in Or you can download the file using the Download link at pluginphpcom look in the folder named 6 in the plug-inszip file If you would like to have random length words in your Captchas, you can achieve this by modifying the function call to use the rand() function as in the following, which will generate a Captcha of between four and ten letters in length: