This will continue indefinitely until the script is recompiled. If you run it again, the dialog will indicate that the script has been run three times. If you then run the script again, the dialog will indicate that the script has been run two times. If you run the previous code in Script Editor, the first time the script is run, a dialog will be displayed indicating that the script has been run one time. The following example code demonstrates how a property can be used to store a persistent value between script executions.ĭisplay dialog "This script has been run " & theRunCount & " time(s)." Let's take a look at a property in action. This makes properties an ideal mechanism for storing and retrieving data, so long as the script does not need to be frequently recompiled. Properties also retain their most recent values between script executions, and will continue to do so until the script is recompiled. For example, after defining the property in the previous example code, the following code would be valid executable code at any level of the script, and would not generate an error indicating that propertyName is not defined. This means that the property is accessible at any level of a script - at the top level, and also within any handlers. Unlike local variables, however, properties are global in nature. You may get the value of a property and you may set the value of a property in the same way that you would do with a variable. Script properties are accessible in the same way that variables are accessible. Rather, you may immediately begin referring to the property. This means that there is no need to define a value for the property, as you would a variable, within your script's executable code. When a script property is defined, its value is officially assigned when the script is compiled. Once a property has been defined, it becomes global in nature, and is accessible both throughout the top level of the script, as well as throughout any handlers in the script.įor information about script objects, please refer to the AppleScript Language Guide at: Script properties may be defined anywhere within the top level of a script (or a script object). A script property is defined within a script using the following syntax: When writing a script, you can define properties for your script itself. For example, in the Finder, the disk class possesses a number of properties, including a name, capacity, and format. When scripting an application, many times, a class within that application will possess properties, or attributes that are accessible through AppleScript. The first mechanism for data storage that I would like to address is a script property. In this month's column, I would like to discuss some other methods of storage and retrieval, such as accessing properties directly within scripts, or within property list files in the operating system. I discussed how Database Events can be used as a method of data storage and retrieval by allowing AppleScript to interact directly with SQLite databases. In last month's column, I provided an introduction to Database Events, a new technology that made its debut with Mac OS X Tiger. Storing and Accessing Data with AppleScriptĬolumn Tag: Programming AppleScript Essentials Storing and Accessing Data with AppleScript Educational Institution and Student Discounts.
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