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Script 14-6. set the_file_path to "Macintosh HD:Users:hanaan:work.txt" open for access file the_file_path with write permission set eof file the_file_path to 0 write "this is the beginning" to file the_file_path close access file the_file_path open for access file the_file_path with write permission write " and this is the end!" to file the_file_path starting at eof close access file the_file_path The resulting text file will have the text this is the beginning and this is the end! Notice that the first write command started writing at the beginning of the file as usual. However, by setting the second write command s starting at parameter to the eof constant, you tell that command to add its data to the end of the file instead. If you want to limit the amount of data that gets written, you can do that with the for parameter, which takes an integer as an argument and limits the number of bytes written to that number. In Script 14-7, only the first five bytes of data will be written. Script 14-7. set the_file_path to "Macintosh HD:Users:hanaan:work.txt" open for access file the_file_path with write permission write "abcdefghij" to file the_file_path for 5 close access file the_file_path

The following are two subroutines you can use for basic text file saving. The first one saves the given text to a given text file, and the second handler adds the given text to the end of the given text file. --Saves a text file on write_text_to_file(the_file, the_text) set file_ref to open for access the_file with write permission set eof file_ref to 0 write the_text to file_ref as string close access file_ref end write_text_to_file --Adds text to a text file on append_text_to_file(the_file, the_text) set file_ref to open for access file theTextFilePath with write permission set file_length to get eof file_ref write the_text to file_ref as string starting at eof close access file_ref end append_text_to_file

In this little exercise you will create a handler that I use in all my systems. The purpose is to create a detailed log of script activity. This log will help you determine what went wrong if the script crashes and you re on the other end of the phone with a communicationally challenged individual trying to describe the problem to you.

To demonstrate this in a simple example, add a button to a page, and in a managed bean add the following code:

The idea behind the logging system is that instead of collecting all the messages into a long string and writing the whole thing to a file at the end, the script constantly writes the latest information to the end of the file. This way, if the script gets an error, you can pinpoint the error location in the script. You can make the log as detailed as you want by calling the handler from more areas in your script. The handler really is pretty simple. It receives a message to add to the log and adds it along with the date and time.

You can make the log file folder structure more complex by incorporating a date-based folder structure: a year folder containing a folder for each month, containing all the log files for that month. For now, you will keep it simple. Instead, you will create a log file whose name will include the date and the file extension .log. You will use .log because on OS X, files with this extension are automatically opened by the console application, which adds a level of coolness to the mix. To keep things simple, the handler shown here just saves the log files to the current user s desktop, but you can easily modify it to use a different location if you want.

Script 14-8 shows the finished add_to_log handler To use it, call it from anywhere in the script with a simple text message that describes your current location in the script Script 14-8 1 on add_to_log(the_message) 2 set YY to year of (current date) 3 set MM to month of (current date) as integer 4 if MM < 10 then set MM to "0" & MM 5 set DD to day of (current date) 6 if DD < 10 then set DD to "0" & DD 7 set log_file_name to (YY as string) & "_" & MM & "_" & DD & "log" 8 set log_file_path to (path to desktop as string) & log_file_name 9 set full_message to return & (current date) & return & the_message 10 set file_ID to open for access file log_file_path with write permission 11 write full_message to file_ID starting at eof 12.

public void TestMessageButton(ActionEvent actionEvent) { // Add event code here... FacesMessage fm = new FacesMessage("A Programmatic Info Message"); fm.setSeverity(FacesMessage.SEVERITY_INFO); FacesContext context = FacesContext.getCurrentInstance(); context.addMessage(null, fm); }