asp.net textbox barcode scanner The before and until Parameters in Objective-C

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The before and until Parameters
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The before and until parameters are similar: they both allow you to specify a character at which the read command should stop reading. The before parameter tells the read command to read up to before the specified character, and the until parameter includes the indicated character.
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Let s assume you have a text file with the contents abcde-abcde. The following scripts illustrate how to use the until and before parameters: read alias "Macintosh HD:work.txt" before "d" --> "abc" Notice that the character d is omitted from the end of the returned string, unlike in the next script: read alias "Macintosh HD:work.txt" until "d" --> "abcd" You can also combine the before and until parameters with the from parameter. For example, let s start from the fifth byte and read until d: read alias "Macintosh HD:work.txt" from 5 until "d" --> "e-abcd" This time, the script started from the fifth character and continued until the following instance of d.
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Combining the read and open for Access Commands
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Two more commands in Standard Additions File Read/Write suite are open for access and close access. These commands open read and write access to files. As you can see in the following read example, for simple tasks the read command does not require that the file is first opened for access: read alias "Macintosh HD:some text file.txt" --> "Contents of the text file" Opening the file with the open for access command prior to reading it changes the scene a bit. When a file is opened for access, one of the things Standard Additions does is create an internal marker that determines the position in that file where the next read (or write) operation should start. To understand that better, imagine reading a book. When you start reading the book, you begin at page 1 and you read, say, five pages. When you put the book down, you insert a marker at page 5 so you ll remember where you stopped last time. The next time you pick it up again, you continue reading from the point of the marker, and as you read more, the marker advances. When you get to the end of the book, you close it and put it away. The same is true with reading a text file that has been opened for access; the only difference is that Standard Additions takes care of moving the bookmark for you. As an example, use TextEdit to create a new document, and type the alphabet: abcde...wxyz. Save the file as work.txt in your Documents folder, and close it. Now you will learn to write a script that uses the read command with the for parameter. Start a new script, and write what s shown in Script 14-5. Script 14-5. set the_file to alias ((path to documents folder as string) & "work.txt") open for access the_file repeat set the_text to read the_file for 4 display dialog the_text end repeat Now run the script.
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The script will loop, each time reading the next four bytes as a four-character string (assuming AppleScript and TextEdit are using MacRoman or a similar single-byte character set), until it gets to the end of the file. At that point, you will get an EOF error, number 43. Unless you use the read command s from parameter, you will not be able to read this file again until you use the close access command to close access to that file. Try to run your script again, and you will get the error right away. To fix the problem, do the following: to close the file left open by the previous script, create another script file, then type this line, and finally run the script: close access alias ((path to documents folder as string) & "work.txt") This tells Standard Additions to forget the last-read position in this file so the next time you use the command read the_file, it will start reading from the start of the file again. As mentioned, running this script will end up causing the script to try and read bytes that don t exist. To prevent that, you can use the following script to catch the EOF error: set the_file to alias ((path to documents folder as string) & "work.txt") open for access the_file try repeat set the_text to read the_file for 4 display dialog the_text end repeat on error number -39 --handle the end-of-file error close access the_file display dialog "All done!" end try
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