Working with files
To work with files, we need the IOStream
type. IOStream
is a type with the supertype IO
and has the following characteristics:
- The fields are given by
names(IOStream)
4-element Array{Symbol,1}: :handle :ios :name :mark
- The types are given by
IOStream.types
(Ptr{None}, Array{Uint8,1}, String, Int64)
The file handle is a pointer of the type Ptr
, which is a reference to the file object.
Opening and reading a line-oriented file with the name example.dat
is very easy:
// code in Chapter 8\io.jl
fname = "example.dat"
f1 = open(fname)
fname
is a string that contains the path to the file, using escaping of special characters with \
when necessary; for example, in Windows, when the file is in the test
folder on the D:
drive, this would become ...
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