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Unknown error. Can t divide <number> by zero. The result of a numeric operation was too large. <reference> can t be launched because it is not an application. <reference> isn t scriptable. The application has a corrupted dictionary. Stack overflow. Internal table overflow. Attempt to create a value larger than the allowable size. Can t get the event dictionary. Can t both consider and ignore <attribute>. Can t perform operation on text longer than 32K bytes. A <language element> can t go after this <language element>. Expected <language element> but found <language element>. The <name> parameter is specified more than once. The <name> property is specified more than once. The <name> handler is specified more than once. The variable <name> is not defined. Can t declare <name> as both a local and global variable. Exit statement was not in a repeat loop. Tell statements are nested too deeply. <name> is illegal as a formal parameter. <name> is not a parameter name for the event <event>. No result was returned for some argument of this expression.

The following sections summarize the chapter in an intensive reference style. Use these sections to look up facts related to the chapter without the chatter.

So, how do you call this method when a new customer is being created It s quite simple. You can call it from the create() method to set the value of CustomerId:

Compile errors are errors that occur while the script tries to compile. Compiling scripts is what happens before the script even runs. Typical compile errors are aliases that point to a nonexistent file, two variables in a row, not using a tell block when using application-specific terms, and so on.

Runtime errors are errors that happen only while the script runs. An error that is thrown while the script is running has a few components that either are used by the scripter to debug the problem during development or are used by the script itself to determine how it should precede in case the error is trapped. Untrapped errors will cause the script to stop, and usually AppleScript will display a dialog box containing the grim details of the error to the user. The error components are the error text, error number, offending object, and expected type.

4

You trap errors with the try block. Any runtime error that occurs in a statement inside a try block will not stop the script. The following is the basic try statement block: try set x to 2 + "five" end try You can tell the script what to do in case there s an error anywhere within the try block by adding the on error line to the try statement, like this: try set x to 2 + "five" on error set x to 0 display dialog "Couldn't get the value of x!" end try You can get the error components by placing variables after the on error line, like this: try set x to 2 + "five" on error error_text number error_number from offending_object to expected_type display dialog "There was an error, and here is what happened:" & return & error_text end try

protected void create(AttributeList attributeList) { super.create(attributeList); setCustomerId(nextVal("Customer_Seq")); }

You can use the error command to throw errors at any point during the script, like this: error "Something happened" number 999 Although I used only the error text and number components, you can use the other two as well. Be aware that Apple reserves negative error numbers.

lthough subroutines aren t the first thing you create when you learn AppleScript, they are the one facet of writing scripts that will have the most impact on your scripts, especially as they grow bigger and more ambitious. Subroutines are your tools for organizing scripts; they make your scripts efficient and give you a perfect way to store and reuse your code.

Subroutines allow you to create your own commands. A command is simply an isolated block of code that does something, defined by AppleScript, a scripting addition, or a scriptable application. This code is executed from somewhere else in the system and can be reused over and over again, wherever you need that functionality to occur. A command you use in AppleScript can trigger a few or many lines of code, depending on its complexity. Your subroutines aren t much different; it s just that subroutines are commands written using AppleScript, which means you can easily write them and use them yourself. Rather than being part of the main body of the script, subroutines are organized away from it and are called, or triggered, from the main body of the script or from other subroutines.