Game Development Reference
In-Depth Information
io.flush ( )
This function runs
file:flush()
on the default file. When a file is in buffered mode, the data is not
written to the file immediately; it remains in the buffers and is written when the buffer nears getting
full. This function forces the buffers to write to file and clear up.
io.input ( [file] )
This function returns the current default input file when called without any parameters. The parameter
passed can be either a filename or a file handle. When the function is called with a filename, it sets
the handle to this named file as the default input file. If it is called with a file handle, it just sets the
nil
.
io.lines
is called without a filename, it is equivalent to
io.input():lines()
, and it reads from
for line in io.lines(filename) do
print(line)
end
io.open ( filename [,mode] )
This function is the main function that you use in reading and writing files with Lua. The mode is a
string value that can be one of the following:
"r"
: Read mode (default).
"w"
: Write mode.
"a"
: Append mode.
"r+
"
: Update mode. All previous data is preserved.
"w+
"
: Update mode. All previous data is erased.
"a+
"
: Append update mode. All previous data is preserved and writing is only
allowed at the end of the file.
The mode can also have a
"b"
at the end to indicate that the file is to be opened in binary
mode rather than in text mode. This function returns a file handle that can be used in explicit file
operations.
file = io.open("myfilename.txt", "r")
