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When Your Scripts Are Used by Clients
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Oh, the joy of writing scripts for cash. The problem is that those scripts never seem to forget their creator, and they call out to him from all around the globe. Yes, once you create a script that is used by someone, they will hunt you down whenever anything goes wrong. I still have clients I wrote scripts for years ago calling me with questions about them. The best defense against being swamped with fixing old scripts is to create good scripts to begin with (not that good scripts don t break they do but the trick is to know exactly where they stopped, even years after you created them). The best way I know to allow me to troubleshoot scripts remotely (other than Timbuktu, of course) is to give the script the ability to create a log that records its activity. This log can be enabled somehow by the client and, when enabled, will create a file where it adds lines of text each time certain things happen in the script. This may sound like overkill, but truly, once you create the log subroutine, you can use it in any script you create. The most important part of constructing the log subroutine is to not make the mistake of creating a string variable, adding log text to it, and writing it to a file at the end. What will happen is that the script will stop in the middle because of the bug, the string variable with all that good log information will be erased from memory, and you will still be clueless. Instead, use write log_test to the_file at eof. This will ensure that each line you want to log will be added to the end of the text file right away.
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CHAPTER
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Saving and Running Scripts
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lthough any script you write using AppleScript still looks the same and generally utilizes the same system resources to run, the Mac makes that AppleScript functionality available to you in a few ways. The most common forms used to save and run scripts are script applets, script droplets, and compiled scripts. This chapter will cover the different ways you can put scripts to work. You can find most of the options for saving scripts in the Save dialog box of whichever script editor you re using. Figure 24-1 shows the Apple Script Editor Save dialog box.
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Figure 24-1. Apple Script Editor s Save dialog box Table 24-1 shows the file formats available for saving AppleScript files. Table 24-1. AppleScript File Formats
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Type Application applet Description A normal application applet that runs when you double-click it. An application applet containing an on open handler. Options Run only, stay open, start-up screen Run only, stay open, start-up screen Features Simple applet. Name Extension .app Icon
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Droplet application applet
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Allows your script to process files dropped on it.
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Continued 583
CHAPTER 24 SAVING AND RUNNING SCRIPTS
Table 24-1. Continued
Type Application applet bundle Description An application applet saved as a Cocoa bundle. Options Run only, stay open, start-up screen Features Can also be saved as a droplet by including the on open handler. The bundle can hold any files such as templates, and so on. Can also be run from the Mac OS X Script menu or other script runner utilities. The script bundle can hold any files such as templates, and so on. Opens without requiring referenced application applets to be open. Name Extension .app Icon
Compiled script
The native AppleScript file format. Can be executed from within the script editor or loaded into other scripts. The same as a compiled script but uses Cocoa s three-bundle format. An ASCII plain-text file that contains the noncompiled version of the script.
Run only
.scpt
Compiled script bundle Text file
Run only
.scptd
Line encoding
.applescript
Using Compiled Scripts
A compiled script file is AppleScript s default file format. What is the difference between a compiled script and plain text When you compile the script, a few things happen. The first thing you may notice is that the script text gets formatted based on the AppleScript formatting settings you specified in the Script Editor s preferences. In addition, you may have noticed that if AppleScript didn t recognize any of the applications you used in the script, it asks you to locate them, and then it launches them in order to compare the keywords you used in this application s tell block with the ones defined in the application s dictionary. In the compiled script, AppleScript actually includes several kinds of information identifying each application used its filename, its creator type, and an alias to its last known location any of which can be used to find that application again later. This allows it to recognize that application even if it is renamed, moved, or even upgraded. That s right if you created a script a year ago with Adobe Illustrator 10 and you re opening it now, AppleScript may recognize Illustrator CS as the target. AppleScript also converts the syntax from AppleScript s hallmark English-like syntax into what appears to be cryptic text that is actually tokens that can be understood only by the AppleScript interpreter. A compiled script file containing the simple script display dialog "Hello" looks like the following when viewed raw in Bare Bones Software s BBEdit: FasdUAS 1.101.10 l I .sysodlogaskrTEXT m\\ Hello .aevtoappnull ****
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