how to create barcode in c#.net 10: Debugging and Handling Errors in Microsoft Office

Encoder Universal Product Code version A in Microsoft Office 10: Debugging and Handling Errors

10: Debugging and Handling Errors
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Figure 10-1 When a script runs into an error, it displays an error message
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You ve seen this behavior already in this book, where you used an OK/Cancel dialog box to let the user choose whether to run a script or cancel out of it As you ll see later in this chapter, you can check for this special error and take advantage of it in your scripts
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Causing Errors Deliberately
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In this example, you cause two errors deliberately in a script and watch how AppleScript handles them Follow these steps:
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1 In AppleScript Editor, press z-N or choose File | New to create a new script 2 Type the following short script, which tells the Finder to close every Finder window
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and then return the position of the front window This is guaranteed to cause an error every time
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tell application "Finder" close every Finder window get the position of the front Finder window end tell
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3 Press z-R or click the Run button on the toolbar to run the script You ll get an AppleScript
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Error message, as shown in Figure 10-2
4 Click the OK button to dismiss the error message
Figure 10-2 The sample script produces an error message because it tries to return the position of the front Finder window when no Finder window is open
(continued)
AppleScript: A Beginner s Guide
Figure 10-3 Click the Cancel button in the dialog box to produce an error that stops the script from running
5 At the beginning of the script, add a display dialog statement that prompts the user to
run this script, as shown in boldface here:
display dialog "Run this script " tell application "Finder" close every Finder window get the position of the front Finder window end tell
6 Run the script The dialog box appears, as shown in Figure 10-3 7 Click the Cancel button Notice that the script simply stops running and doesn t execute
the tell block to the Finder
8 Save the script under a name of your choice 9 Leave the script open so that you can work with it in the next Try This example
Suppressing an Error with a Try Block
The first stage of handling errors in your scripts is to prevent the user from seeing them To do this, you use a try block When an error occurs in a try block, AppleScript ignores the error, goes to the end of the try block, and keeps on running the script A try block starts with the try statement and ends with the end try statement, like this:
try end try
Inside the block goes the statement or statements that may cause the error, like this:
try tell application "Finder" get the position of the front Finder window end tell end try
10: Debugging and Handling Errors
The key thing to remember about try blocks is that as soon as an error occurs, AppleScript stops executing the statements in the try block and continues with the statement after the end try statement This means that you need to arrange your try blocks carefully to make sure that an error doesn t cause AppleScript to skip any vital statements: Simply placing the whole of a script inside a try block doesn t usually do much good unless the script contains only a single command that you care about You can put try blocks in sequence, as you ll see in the next example You can also nest one try block inside another try block, as shown in boldface here:
try tell application "Finder" get the position of the front Finder window try set the target of the front Finder window to folder "Sludge" of folder "Documents" of home end try set the bounds of the front Finder window to {0, 44, 800, 844} end tell end try
If the current user s Documents folder doesn t contain a folder named Sludge (and no, mine doesn t either), the inner try block captures the error, so the set the bounds of the front Finder window statement still runs
Try This
Adding a Try Block to a Script
In this example, you add a try block to the script you created in the previous example Follow these steps:
1 Activate the window that contains the script you created in the previous example 2 Type two hyphens to comment out the display dialog statement at the beginning, as
shown in boldface here:
-- display dialog "Run this script " tell application "Finder" close every Finder window get the position of the front Finder window end tell
3 Place a try block around the tell block, as shown in boldface here:
-- display dialog "Run this script " try tell application "Finder"
(continued)
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