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Identifying Errors by Running a Script
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Often, the best way to find out which errors are likely to occur is to run a script under the wrong conditions and see what happens For example, in a script that creates a document and saves it to a folder, you may need to trap errors such as these:
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The folder doesn t exist in the file system A document of the same name is already lurking in the folder
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Besides producing as many errors as you can while developing and testing your script, you may also need to update your scripts when users produce new errors Many hands make light work, but many users whaling on your scripts in creative ways will likely produce errors you had never considered
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AppleScript: A Beginner s Guide
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Another approach is to look up the errors in the application s documentation This should give you a clear picture of the hundreds of different errors that can (but usually don t) occur, but it may make it harder to zero in on those errors that users are actually likely to produce when they run your scripts
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When you re starting to build scripts in AppleScript, chances are you ll cause plenty of errors some by accident, as you figure out what works and what doesn t, and others deliberately, as you explore the errors that can crop up as a particular script runs These errors you run into will be ones built into AppleScript and the applications you re using But you can also define your own errors using AppleScript s error command This lets you produce a custom error suited to your script (You can also produce custom errors to confuse users of your scripts, but the entertainment will probably pall when they come to you for help)
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Generating an error is sometimes called throwing an error
The error command works in much the same way as the on error command
Start the error statement with the error keyword
error
Add a string containing the message for the error As with the error command, the message is a direct parameter and doesn t have a parameter keyword, such as message, as parameters usually do
error "Your Mac does not have an Intel processor"
Add the number parameter and the number you want to give the error You can choose your own error number freely you don t have to apply in triplicate to a bureaucracy for it but it s best to stay out of the ranges that most applications use: negative numbers, and 0 to 500 on the positive side
error "Your Mac does not have an Intel processor" number 501
10: Debugging and Handling Errors NOTE
AppleScript gives your error the generic error number, 2700, if you don t assign an error number so you should always assign one Likewise, you should always assign an error message; if you don t, AppleScript gives your error a blank string, which is no help to man, beast, or Mac
Here s a code snippet that checks two properties of the system info command and throws an error if the system isn t deemed rugged, windswept, and handsome enough to run a putative demanding application These are the two system info properties used:
CPU type This property returns a string describing the CPU type for example, Intel 80486 for a Core 2 Duo CPU (not one of the 486-numbered chips that preceded the first Pentiums) or PowerPC 7450 for an ageing PowerBook s overwhelmed G4 processor CPU speed This property returns an integer giving the CPU speed in megahertz for example, 2000 for a 2GHz chip, or 999 for a 1GHz chip Here s what the code does:
First, it assigns the CPU type to the variable thisCPU and the CPU speed to the variable thisMHz The outer if statement then checks to see if thisCPU starts with PowerPC; if so, the first error statement runs, throwing an error with a message about this not being an Intel processor (see Figure 10-6) If the processor passes the PowerPC test, the nested if statement checks to see whether thisMHz is less than 2000 If the CPU is slower than 2GHz, the second error
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