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The me variable also comes in handy when you want to call a handler in your script from within an application tell block. If you try to run the script shown in Figure 8-9, you will be presented with the error message shown in Figure 8-10. The reason is that when you call a handler from within a tell block, AppleScript sends that command to the target object specified by that tell block. If the target object contains a handler for that command, it will handle it. If it doesn t, you get an error. I always get a kick from the message Can t continue. I guess what I want is more details, something like Can t continue because my feet hurt or something. Anyway, the message actually means that the Finder didn t know how to handle the say_hello command and couldn t find a scripting addition that could handle this command either. What you have to do in this case, or whenever you want to call a local handler from within a tell block that s directed to an application, is to direct the command toward the script, not the application. Figure 8-11 shows how you do that.

hen programming your robots, you may find many times that you need to perform some basic math in order to properly direct them. While I don t have the space to cover every possible mathematical calculation you may need, I do want to focus on three very simple subjects that you might find useful. The first is converting between degrees and rotations; the second is calculating travel distance based on the number of degrees or rotations you configure; and the third is a very short discussion of how the X/Y coordinate system works on your Brick.

Figure 8-9. Calling the say_hello handler from within the Finder tell block generates an error since the Finder doesn t have a say_hello command defined in its dictionary.

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each() function, we check all the checkboxes of the form one by one and if any of the checkbox is found checked, we increment the value of the counter variable count by 1 and the amount of that food item is added to the amt variable That is, we are setting the count of the checked checkboxes in the count variable and the total amount of the selected checkboxes in the amt variable After inspecting all the checkboxes, if we find that the value of the count variable is 0, meaning none of the checkbox is selected, we make the paragraph element meant for displaying the error message visible to display Select at least one checkbox on the screen.

Figure 8-11. To call a handler that belongs to the main script from within an application s tell block, you have to target the script using the me variable.

Another way to get the same result, as explained in the following section, is to just add the word my before the command: tell application "Finder" my say_hello() end tell

If the value of the count variable is not 0 (meaning at least one of the checkboxes is selected), we make the paragraph element of the class result visible (and hide the paragraph of the class error) and assign the following text to it: Your bill is $ +amt, where amt is the variable in which the total amount for the food items selected is stored If we select none of the checkboxes and select the Submit button, an error message Select at least one checkbox will appear on the screen, as shown in Figure 4-15..

Another problem you may encounter is when you try to retrieve values of properties whose names are used both as a property in your script and as a property in the application. Take, for example, Script 8-12. Script 8-12. property name : "Olivia" tell application "Finder" tell file 1 of disk "Macintosh HD" display dialog (get name) end tell end tell In line 4 you want to get the value of the script s name property and have the Finder display this value in a dialog box. However, the dialog box displays the name of file 1 of disk Macintosh HD instead. If you want the dialog box to display the property name defined in the script itself, you must specify it using this: get name of me Or you can use its slightly better-looking equivalent: get my name Either way, the name Olivia will be displayed, not the name of the file.

Notice the Result area in Figure 12-16. Until now, the result record had a single property labeled button returned. Now, it has another property: text returned.

If we select one checkbox, the error message will become invisible and the bill for the selected food item will appear as shown in Figure 4-16.

CHAPTER 7 WIRED!

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