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CHAPTER 3: File System Access File object 52

execute()

fileObj.execute ()

Opens this file using the appropriate application, as if it had been double-clicked in a file browser.

You can use this method to run scripts, launch applications, and so on.

Returns true immediately if the application launch was successful.

getRelativeURI()

fileObj.getRelativeURI ([basePath])

basePath

Optional. A string containing the base path for the relative URI. Default is the current

folder.

Retrieves the URI for this file, relative to the specified base path, in URI notation. If no base path is

supplied, the URI is relative to the path of the current folder.

Returns a string containing the relative URI.

open()

fileObj.open (mode[,type][,creator])

mode

A string indicating the read/write mode. One of:

X r: (read) Opens for reading. If the file does not exist or cannot be found, the call

fails.

X w: (write) Opens a file for writing. If the file exists, its contents are destroyed. If

the file does not exist, creates a new, empty file.

X e: (edit) Opens an existing file for reading and writing.

X a: (append) Opens the file in Append mode, and moves the current position to

the end of the file.

type

Optional. In Mac OS, the type of a newly created file, a 4-character string. Ignored in

Windows and UNIX.

creator

Optional. In Mac OS, the creator of a newly created file, a 4-character string. Ignored

in Windows and UNIX.

Opens the referenced file for subsequent read/write operations. The method resolves any aliases to

find the file.

Returns true if the file has been opened successfully, false otherwise.

The method attempts to detect the encoding of the open file. It reads a few bytes at the current

location and tries to detect the Byte Order Mark character

0xFFFE. If found, the current position is

advanced behind the detected character and the encoding property is set to one of the strings

UCS-2BE, UCS-2LE, UCS4-BE, UCS-4LE, or UTF-8. If the marker character is not found, it checks for

zero bytes at the current location and makes an assumption about one of the above formats (except

UTF-8). If everything fails, the

encoding property is set to the system encoding.

OTE: Be careful about opening a file more than once. The operating system usually permits you to

do so, but if you start writing to the file using two different

File objects, you can destroy your data.

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