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Having spent the last portion of the chapter trying to contain and control errors, why in the world would you want to go around creating them yourself Well, in some situations during the script s execution, you will realize that the best way to proceed is to throw an error. In many cases, this error will be handled by the same error trapping mechanism you set up to trap other possible errors. To throw an error yourself, you use AppleScript s error statement. The most basic form of this statement is simply this: error Running this statement causes AppleScript to raise an unknown error with the generic message An error has occurred and with an error number of 2700. However, in most situations you ll want to supply a more meaningful error message and error number. Here s the full definition of the error statement: error [error_message] [number error_number] [from offending_object] [to expected_type] [partial result result_list] As you can see, the error statement has the same parameters as the try statement s on error line. The error message and error number are the two parameters you ll usually use for throwing errors. For example: error "E.T. could not phone home: wrong number" number 411 Figure 17-4 shows the error dialog box that this error, unhandled, will display.

myFloat = 100000; printf( "myFloat = %g\n", myFloat );

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Figure 17-4 The error message shown in an AppleScript application error dialog box Throwing your own errors is a good idea when part of your script hits a problem it can t deal with itself Not only does this let other parts of the script know there s a problem, but it also gives them a chance to deal with it if they want by trapping and handling that error in a try block As an example, let s say you re writing a script where one part involves looking up a phone number based on a person s name.

Here s the output:

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The names and phone numbers are stored in a list of lists like this: set contact_table to {{"Joe", "5553712"}, {"Pam", "5550232"}, {"Sam", "5556795"}} This list works as a simple lookup table: to get a phone number, you loop through each item in the main list, checking to see whether the name matches the one you want When the loop finds a matching name, it returns the corresponding phone number For example, if the name is Sam, then the value returned will be 5556795 You ll encounter one other possibility, though: what if none of the entries in the table matches the desired name Well, let s take a page out of AppleScript s book here Just as saying get item 10 of {1, 2, 3, 4, 5} will cause AppleScript to raise a Can t get item .

Next, myFLoat s value is changed to 1,000,000, and %g is used once again:

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error, I ll have my tablesearching subroutine generate a similar error when it can t find the entry that was requested Here s the error statement I ll use: error "The item was not found" number 1728 Since the type of error being reported is similar to an existing AppleScript error, I ve used the same error code as AppleScript, 1728 But I could make up my own error code for it if I preferred, such as error number 6000, Can t find an entry with the given key in a lookup table Here s the full table lookup subroutine: on get_value_for_key(key_value_list, key_to_find) repeat with item_ref in key_value_list set {this_key, this_value} to item_ref if this_key = key_to_find then return this_value end repeat error "The item wasn't found.

myFloat = 1000000; printf( "myFloat = %g\n", myFloat ); return 0; }

" number 1728 end get_value_for_key And here are some examples of its use: get_value_for_key(contact_table, "Pam") --result: "555-0232" get_value_for_key(contact_table, "Frank") --error: The item wasn't found..

Here s the result of this last printf(). As you can see, this time printf() decided to represent the number using exponential notation:

Now when the get_value_for_key handler raises the error number 1728, the part of the script that called it can handle that error in any way it wants. For example, it might catch that particular error number and record the problem in a log file before continuing to the next task: try set the_phone_number to get_value_for_key(contact_table, the_person) on error number 1728 add_to_log("Couldn't call " & the_person) set the_phone_number to missing value end try if the_phone_number is not missing value then --call the person at that number... end if Or, it might choose to ignore the error completely, letting the script stop straightaway, and display the standard AppleScript error dialog box. As the designer of the script, the choice is up to you.

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The lesson here is to use floats if you want to work with floating point numbers. Use doubles or long doubles for extra accuracy, but be aware of the extra cost in memory usage. Use ints for maximum speed if you want to work exclusively with whole numbers or if you want to truncate a result.

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