GIVING COMMANDS in Objective-C

Maker QR Code in Objective-C GIVING COMMANDS

So, what do you do You know that the Finder understands a reference such as name of home, and you know that AppleScript understands a reference such as text 1 thru 3 of some_string. The answer is clear: you need to split the one big reference into two, giving the Finder one and AppleScript the other. You can write this in a couple of ways. Here s the first way: tell application "Finder" set the_name to name of home set abbreviated_name to text 1 thru 3 of the_name end tell --> "han" Here you put the two references on separate lines. This makes AppleScript send an implicit get command to resolve the reference name of home on line 2. Line 3 then takes the resulting string value and asks AppleScript to extract the part you want. Another way you can do it is insert an explicit get command: tell application "Finder" set abbreviated_name to text 1 thru 3 of (get name of home) end tell --> "han" Once again, you force AppleScript to send a get command to the application at the exact point you want. You then use AppleScript to deal with the resulting string value. Both approaches are fine, although the second way has the advantage of being a bit more compact. Another common situation where AppleScript fails to send a get message when you need it to is when using a repeat with...in... loop with an application reference. For example: tell application "Finder" repeat with folder_ref in every folder of home --Do some stuff with folder_ref here end repeat end tell You might expect the previous code to get a list of folder references from the Finder and loop over that. Unfortunately, somebody must have forgotten to tell AppleScript this, because instead it creates a series of references like item 1 of every folder of home of application "Finder", item 2 of..., and so on, assigning those to the folder_ref variable instead. As you can imagine, these sorts of references can cause all sorts of problems when you try to use them, since instead of identifying a folder in the home folder, each one points to an item (file, folder, and so on) in each of the folders of the home folder not what you meant at all! Once again, you need to help AppleScript, persuading it to send the Finder a get command that returns a list of folder references that you can then loop over yourself: tell application "Finder" set folders_list to every folder of home repeat with folder_ref in folders_list --Do some stuff with folder_ref here end repeat end tell Or for example: tell application "Finder" repeat with folder_ref in (get every folder of home) --Do some stuff with folder_ref here end repeat end tell

The count command returns the number of items in a list, a record, or a string. Here are some simple examples: count "abc" --> 3 count {"alef", 2, "gimel", "dalet"} --> 4 count {name: "Jerry", occupation: "singer", outlook: "grateful", status: "dead"} --> 4 If you want the count command to count only those items of a particular class, you can use the optional parameter, each: count {"alef", 2, "gimel", "dalet"} each string --> 3 count {"alef", 2, "gimel", "dalet"} each number --> 1 Strings, lists, and records also have a length property that allows you to find out the number of items they have: length of {"alef", 2, "gimel", "dalet"} --> 4 Or if you re interested only in a single class of items, you can use a reference like this: length of every number of {"alef", 2, "gimel", "dalet"} --> 1 It s largely a matter of personal preference whether you use AppleScript s count command or an object s length property when dealing with AppleScript values. Just use whichever one you think looks best.