asp.net barcode scanning SCRIPTING FROM THE GROUND UP in Objective-C

Making QR in Objective-C SCRIPTING FROM THE GROUND UP

CHAPTER 2 SCRIPTING FROM THE GROUND UP
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The Many Faces of tell
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This section provides a few variations of how you can use the tell statement. They all work the same, but some are better than others in different situations. The main difference between the different ways of using the tell statement is in readability versus the number of lines you use, so the decision is left up to you. So, what are the different ways to tell Let s return to the dean example. The dean used a long sentence that included the target object (the student) and the command in a single line: Tell the student in the second seat in the first row of Ms. Steinberg s class to bring me the report by tomorrow. From that statement, you can start to understand the school s object model, which is essential if it is a scriptable application. The model is as follows: the main object is a school, this object contains the classroom objects, and each classroom has a teacher. You can refer to each classroom by the teacher s name! Also, each classroom has seats arranged in rows, and each seat has a student. Each student has a name, age, and other useful school-related properties. In this case, the main school object contains only one object, but it can contain other objects, such as labs, janitors, gyms, and so on. Now that you understand the object model a bit better, you realize that the dean could have also said to his helper, AppleScript: Tell Ms. Steinberg s class to tell the first row to tell the student in the second seat that the report is due . . . . Notice how things got reversed Now, instead of starting from the last object, you start at the top and go down: tell the class, followed by the row, followed by the seat. Before it was the seat that is in the row that is in the class. How about a real example Open Script Editor, and enter the script shown in Figure 2-6.
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Figure 2-6. Referencing the same object in two ways Look at the two ways you provide a reference to the same folder object. In the first example, you wrote a single, complete reference to the object you want: folder "AppleScript" of folder "Applications" of startup disk. In the second example, you have a series of nested tell blocks, each describing part of the reference. As AppleScript evaluates these tell blocks, it gradually assembles these partial references into a single, complete reference to the object you want, which again is this: folder "AppleScript" of folder "Applications" of startup disk.
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CHAPTER 2 SCRIPTING FROM THE GROUND UP
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To prove that both examples identify the same folder object, run the two examples. The first one opens the AppleScript folder in your Applications folder, and the second one closes it again.
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Objects You Can Tell Things To
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Let s return to the main topic here, the tell statement. Let s look at some objects that like to be referred to with the tell statement. The main type of object is application, an object representing a scriptable application. Anytime you want to send commands to an application, you have to direct them to an application object that identifies that application. For convenience, a tell block is normally used to identify that application object as the target for one or more commands within that tell block. Later you will also see how you can load script objects into variables and that the value contained in the variable will become an object that likes to be told things.
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Telling in Blocks
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The dean scratches his head. He realized that two more students from that same class owe him different reports. Now, when instructing his trusted helper, AppleScript, he may not want to write out the entire reference to a student each time he wants to send that student a command. Instead, he can start with this: While you re in Ms. Steinberg s class, tell the student in seat 4 of row 2, the student in seat 1 of row 6, and the student in seat 2 of row 3 that they have reports due. See, when writing scripts, many times you will want to direct more than one command to the same object (or group of objects). What you won t want to do is write the entire object reference (file 1 of folder 4 of folder Applications) each time. Instead, you can use a tell block. Here is how: in a tell block, you start by identifying the object or objects you want to affect, then you apply one or more commands that will affect these objects, and you finish with the line end tell. For instance, in the Finder example, you have the folder s position. What if you want to get the modification date of the folder as well Here is how you can do that: 1. You start with the tell block. Enter the lines shown in Figure 2-7, and click the Compile button. The second line starts with a double hyphen. This turns it into a comment, and AppleScript ignores it.
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