Opening and Closing Files

fid = Open(filename [,mode])

Opens a file in the mode specified by the optional string, mode. It returns a new file handle or nil.

filename

A string specifying the full path qualified filename.

mode (optional)

A string specifying the mode in which to open.

See the table below for options.

fid

A handle to the file that can be used for subsequent operations on the file. It is set to nil on failure.

r	Read (default).
w	Write.
a	Append.
r+	Read update mode. All previous data is preserved.
w+	Write update mode. All previous data is erased.
a+	Append update mode. Writing is only allowed at the end of the file.

The following opens an existing file for reading and stores the returned file handle in fid:

> fid = Open(‘c:/test.txt’,’r’) // Note the use of forward slash

Close(filehandle)

filehandle::close()

Closes the specified file and returns true on success.

filehandle A handle to a file currently open. This is obtained when the file is opened.

The following closes the file opened in the above example using the second method:

> Close(fid) // or equivalently fid::close()