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Generator QR Code in Objective-C WORKING WITH VARIABLES

CHAPTER 8 WORKING WITH VARIABLES
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Both global variables and properties share another important feature: when the script assigns a different value to a property, the property will retain that value even after the script is done running. This means the script can remember values you give it from run to run. If you open the script, however, you will not see the new value assigned to the property, because Script Editor displays the original source code, which is not modified. If you open the script and recompile it, the values of the properties will be reset to the original values you gave them. To test it, type the script in Figure 8-6, and save it as an application. Then run the script a few times.
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Figure 8-6. This script has a property that will retain its value from run to run. When you run the script for the first time, the value of the user_name property is "", or a blank string. The second line in the script picks up on that and asks the user to enter their name. The fourth line assigns the text the user typed to the property user_name. From this point on, the script has the value embedded into it, and the way this particular script is structured, the user has no way to reenter their name. The script in Figure 8-6 verifies that the user typed the right name and gives them the chance to enter a new name. There s always a big question as to whether to use properties or global variables. For the most part, there s no functional difference between them, especially when dealing with relatively simple scripts. As with global variables, you should think carefully before adding properties. Overusing script properties instead of local variables can make the script difficult to understand and debug.
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Understanding When Properties Are a Good Idea
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In the following sections, you ll look at three typical situations in which utilizing script properties can be useful.
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Once in a while some pieces of information belong at the top of the script. For instance, I always include a debugMode property, which has a Boolean value. Certain functions I want performed only if I m debugging, but I would hate to forget to turn them off before I put the script to use, or worse, send it to a client. So, any debugging-related function I just wrap in an if debugMode then block, and all I have to do in order to turn them all off is to set the debugMode property to false.
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CHAPTER 8 WORKING WITH VARIABLES
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Although I will cover this issue in detail when I talk about script objects in 19, it s appropriate to discuss in this section the aspect of including properties in script objects that you load into the main script. A library is just a script containing one or more general-purpose handlers that you regularly use in other scripts. Rather than cutting and pasting these handlers into every script that needs them, you place them in a library script and save it somewhere convenient such as your /Library/ Scripts folder. When another script needs to use these handlers, it loads this library into a property. This allows the library s handlers to be called from anywhere in the script, like this: property ListLibrary : load script (alias "Macintosh HD:Library:Scripts:ListLibrary.scpt") on some_handler() --some statements here that create an unsorted list of names tell ListLibrary to set sorted_names_list to sort_list(names_list) --some statements here that use the sorted list of names end some_handler
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User Preferences
Although requiring users to modify a script themselves in order to use it is often undesirable, some situations just call for it. Take, for example, a droplet script that creates titles in Adobe Illustrator and exports them as TIFF files. The user may indicate they want to change the font the script uses sometime down the road. Well, you could build a way for that user to gracefully change the font, but that would be one more thing to get broken later and . . . you re already out the door . . . so you add the title_font property to the top of the script and tell the user to change it later to a different font. Although I do that sometimes, it can be sometimes difficult to support scripts you know the user is messing with. Anytime you let the user modify your scripts, you re asking for trouble; besides, it s hardly as nice as facilitating a way for the user to change some script settings.
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