asp.net textbox barcode scanner Working with the End-of-File (EOF) Commands in Objective-C

Generator QR in Objective-C Working with the End-of-File (EOF) Commands

Working with the End-of-File (EOF) Commands
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EOF is a whole number that signifies the number of bytes in a given file. AppleScript allows you to both get a file s EOF and set it using Standard Additions get eof and set eof commands. The value returned by the get eof command is the same as the file size as returned by the info for command, as you can see here: set the_file to alias "Macintosh HD:work.txt" size of (info for the_file) = get eof the_file --> true
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From the Dictionary
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The following are the dictionary entries of the get eof and set eof commands: get eof: Return the length, in bytes, of a file get eof anything -- a file reference number, alias, or file reference of a file Result: double integer -- the total number of bytes in the file set eof: Set end of file location for the specified file set eof anything -- a file reference number, alias, or file reference of a file to double integer -- the new length of the file, in bytes. Any data beyond -- this position is lost.
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CHAPTER 14 WORKING WITH FILES
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Getting a File s EOF
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To get the EOF value of a file, you use the get eof command. The get eof command takes a single argument (a valid file specifier value) and returns a whole number. The following script returns the EOF value of the file work.txt from your hard disk: set the_file to alias "Macintosh HD:work.txt" set byte_count to get eof the_file The get eof command returns a real value, although the digit after the decimal is always 0. The reason is that get eof represents the EOF number as a 64-bit double-integer value, but AppleScript can t represent double integers itself so it automatically converts them to reals instead. No big deal, though.
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Setting a File s EOF
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When you set a file s EOF, you in fact determine the new end of the file. Setting the EOF to a smaller number than it already is will permanently delete the data after the new EOF you set. For instance, if the text of a MacRoman file is I Love Christina, the EOF of it is 16 bytes. If you set the EOF to 12, you will find your file saying I Love Chris, which is still perfectly valid but may not be what you intended. On the other side of the coin, if you set the EOF to a larger number than it is, AppleScript will pad the end of the file with extra bytes, each one equivalent to ASCII number 0. These will appear in a text editor as invisible characters, but if you use the arrow keys, you can actually advance through them. The following script sets the size of the file Work.txt to 10 bytes: set the_file to alias "Macintosh HD:work.txt" set eof of the_file to 10 The following script takes the same file and discards the second half of it: set the_file to alias "Macintosh HD:work.txt" set byte_count to get eof of the_file set eof of the_file to (round (byte_count / 2))
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AppleScript allows you to write data to files using the write command as defined in Standard Additions. Although you can write any type of data, for the most part, you ll stick to what you understand, which is text. You can see it, read it, and understand it. (For writing JPEGs, I suggest you use Adobe Photoshop!)
From the Dictionary
The following is the dictionary definition of the write command: write: Write data to a file that was opened for access with write permission write anything -- the data to write to the file to anything -- the file reference number, alias or file reference -- of the file to write to [starting at double integer] -- start writing at this position in the file [for double integer] -- the number of bytes to write; if not specified, -- write all the data provided [as type class] -- how to write the data: as text, data, list, etc.
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