java ean 128

java gs1 128

java gs1-128

java barcode ean 128

java gs1 128

java ean 128,

java gs1 128,
java barcode ean 128,

java ean 128,
java ean 128,
java barcode ean 128,
java ean 128,
java gs1 128,
java gs1-128,

java gs1 128,
java gs1 128,
java ean 128,
java ean 128,
java ean 128,
java gs1 128,
java barcode ean 128,
java gs1-128,
java gs1-128,
java ean 128,
java gs1-128,
java barcode ean 128,
java ean 128,
java gs1 128,
java barcode ean 128,
java gs1 128,
java barcode ean 128,
java gs1-128,
java barcode ean 128,
java ean 128,
java barcode ean 128,
java gs1 128,
java gs1 128,
java ean 128,
java barcode ean 128,
java ean 128,
java gs1-128,
java gs1-128,
java barcode ean 128,
java barcode ean 128,
java gs1-128,

java gs1 128,
java gs1 128,
java barcode ean 128,
java barcode ean 128,
java gs1 128,
java barcode ean 128,
java gs1 128,
java ean 128,
java gs1-128,
java gs1 128,
java gs1 128,
java gs1 128,
java ean 128,
java barcode ean 128,
java barcode ean 128,
java gs1 128,
java barcode ean 128,
java barcode ean 128,
java ean 128,
java ean 128,
java barcode ean 128,
java gs1 128,
java ean 128,
java gs1 128,
java gs1 128,
java gs1 128,
java ean 128,
java gs1 128,
java gs1 128,

In the following example, you ll create a script snippet that prompts the user to enter a date, and then you will then test to see whether the date is valid. If the date is not valid, you will force the user to reenter it. If it is valid, you will give the user a chance to reenter it. In the example, you ll use a repeat loop to check whether the user entry is a valid date. In scripts that ask for specific input from the user, it is important to validate the data entered by the user before moving on with the script. The script shown in Script 5-1 enters a repeat loop with no specified end. The user is allowed out of the loop only if the data provided tests OK. Note that the script starts with a plain repeat and ends with end repeat and that the only way out of the loop is in line 8, which executes only if the user clicks OK in a dialog box. Script 5-1. 1. repeat 2. display dialog "Enter date" buttons {"OK"} default button 1 default answer "MM/DD/YYYY" 3. set user_date to text returned of result 4. try 5. set the_date to date user_date 6. display dialog ("You have chosen:" & return & (date string of the_date)) buttons {"Try again", "OK"} default button 1 7. if (button returned of result) = "OK" then 8. exit repeat 9. end if 10. on error 11. display dialog "Invalid date, please try again using the format \"MM/DD/YYYY\"" buttons {"OK"} default button 1 with icon stop 12. end try 13. end repeat Line 2 of the script asks the user to enter a date and gives a format to follow. Figure 5-4 shows the dialog box.

Figure 5-4. The input dialog box asks the user to enter a date. Line 3 assigns the user s typed text to the user_date variable. The value of user_date is a string that was returned from the display dialog command. So how do you check whether the date is valid You try to convert it into a value of class date. You re counting on that if the date is not valid, trying to convert it into a date object will return an error. Therefore, you put the whole statement into a try block. That try block actually takes over the rest of the script. It starts on line 4 and ends on line 12. If anything goes wrong in lines 5 to 9 that causes an error, the on error part will be executed, telling the user to try again. You start on line 5 by attempting to convert the string the user entered into a date object using a date specifier. If the date string the user supplied converted properly into a date object, you continue by asking the user whether that was really the date they meant to enter. Maybe they mistyped something, or perhaps AppleScript had a different idea of what date was intended. So on line 6 you display an interesting dialog box, shown in Figure 5-5. Part of the dialog box s message presents the user s date as a nicely formatted string, which you obtain from the property date string of the date object. I ll discuss this and other properties of the date object in 5; however, the date string property contains a string that describes the date portion of the date object.

So far you have learned about static navigation, where, for a particular action, the control flow always navigates to the same task flow activity. You can, however, bring more flexibility into the task flow through the use of a router activity. This allows a rule to be evaluated and, depending on the result, navigate to different task flow activities.

Figure 5-5. The dialog box confirming the date entered by the user Line 7 checks whether the user clicked OK to confirm that the date is fine. If the user approves the date, then line 8 executes and exits the repeat loop and therefore allows the script to continue.

The current date command is part of Standard Additions, which comes with the Mac OS. The command takes no parameters and returns a date object containing the current date and time, such as date "Sunday, July 2, 2006 10:15:09 PM". When used as part of a larger operation, the current date command likes to be enclosed in parentheses. Actually, AppleScript is quite aware of that and will many times enclose it, as well as other commands, with parentheses when the script is compiled.

The usefulness of the current date command never ceases to amaze me. Just imagine how many times a day you turn to someone to ask what time or what date it is . . . OK, so its usefulness goes beyond knowing the current date and time. For one, it s a way to get a unique time stamp on which you can perform several operations. You can use the result of the current date command to figure out the time it takes to run a script, as shown in the following example: set start_time to current date --your script here --more script --a few more statements... set end_time to current date set time_in_seconds to end_time start_time display dialog "The script took " & time_in_seconds & " seconds to run!"

13:

Although you can time medium to long scripts with the current date command as shown previously, because of its low precision, for short scripts or script portions it s better to use a third-party scripting addition such as GetMilliSec, which is precise to the millisecond. You ll find GetMilliSec and other scripting additions at http://osaxen.com.