MACROMEDIA FLEX 2-TESTING FLEX APPLICATIONS WITH MERCURY QUICKTEST PROFESSIONAL Manuale Utente Scaricare il pdf (Pagina 8)

487 CHAPTER 23 Debugging and testing

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This is an effective mechanism if you want to record the value of various variables and

components.

Viewing this log file may seem cumbersome without the right tool; fortunately,

trace-log viewers are available.

23.1.4 Trace-log viewers

It’s one thing to make a log, and it’s another to view the log. Using what you have so

far, it would be tedious to continually reload flashlog.txt to see what it currently looks

like.

Fortunately third-party tools are available that do this for you by having a viewing

panel that automatically refreshes as the log file changes. You can use any generic log-

viewing tool, but here are a few we like.

■

Flash Tracer —This extension to the Firefox web browser adds a built-in panel to

Firefox, which is convenient because you don’t need to switch back and forth

between two separate applications. Price: free. https://addons.mozilla.org/en-

US/firefox/addon/3469.

■

ABLogFile Viewer —This is an open source viewer that is actively maintained. It’s

generic in nature, but it remembers the last few files opened, so it’s easy to get

back to the log file. In Windows, the application data directory is hidden, so you

may need to navigate to the directory using Explorer and drag and drop the file

into the ABLogFile Viewer. Price: free. http://www.amleth.com/ablogfile/.

■

Afterthought —This tool was developed specifically for Flash, but it hasn’t been

updated to reflect a modification in the current Flash Player that changed

where the flashlog.txt file is stored; you’ll need to edit the options to tell it

where to look. This tool is nice because it makes sure the window floats at the

front, can filter out warnings, and has handy Clear Screen and Clear Log but-

tons. Price: free. http://www.blazepdf.com/downloads/afterthought_v2_1.zip.

These log files obviously log text, but many things in Flex aren’t textual in nature, so

we’ll need a way to convert these objects into strings.

23.1.5 Converting objects to strings

Whether you’re dumping complex data types to a log file or on screen, you must

transform them into text. Flex makes this easy: most objects support a

toString

()

function that will do the conversion for you. Here’s an example:

var myNumber:Number = 32;

trace(myNumber.toString());

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