class Tempfile

Overview

The Tempfile class is for managing temporary files. Every tempfile is operated as a File, including initializing, reading and writing.

tempfile = Tempfile.new("foo")
# or
tempfile = Tempfile.open("foo") { |file|
  file.print("foobar")
}

File.size(tempfile.path)       # => 6
File.stat(tempfile.path).mtime # => 2015-10-20 13:11:12 UTC
File.exists?(tempfile.path)    # => true
File.read_lines(tempfile.path) # => ["foobar"]

Files created from this class are stored in a directory that handles temporary files.

Tempfile.new("foo").path # => "/tmp/foo.ulBCPS"

Also, it is encouraged to delete a tempfile after using it, which ensures they are not left behind in your filesystem until garbage collected.

tempfile = Tempfile.new("foo")
tempfile.unlink

Defined in:

tempfile.cr

Class Method Summary

Instance Method Summary

Instance methods inherited from class IO::FileDescriptor

blocking blocking, blocking=(value) blocking=, close_on_exec=(arg : Bool) close_on_exec=, close_on_exec? close_on_exec?, closed? closed?, fcntl(cmd, arg = 0) fcntl, fd fd, finalize finalize, pos pos, pos=(value) pos=, read_timed_out read_timed_out, read_timed_out=(read_timed_out) read_timed_out=, read_timeout=(read_timeout : Number)
read_timeout=(read_timeout : Time::Span)
read_timeout=(read_timeout : Nil)
read_timeout=
, reopen(other : IO::FileDescriptor) reopen, seek(offset, whence = Seek::Set : Seek) seek, stat stat, tell tell, to_fd_io to_fd_io, tty? tty?, write_timed_out write_timed_out, write_timed_out=(write_timed_out) write_timed_out=, write_timeout=(write_timeout : Number)
write_timeout=(write_timeout : Time::Span)
write_timeout=(write_timeout : Nil)
write_timeout=

Class methods inherited from class IO::FileDescriptor

fcntl(fd, cmd, arg = 0) fcntl, new(fd, blocking = false, edge_triggerable = false) new

Instance methods inherited from module IO::Buffered

close close, flush flush, flush_on_newline=(flush_on_newline) flush_on_newline=, flush_on_newline? flush_on_newline?, read(slice : Slice(UInt8)) read, rewind rewind, sync=(sync) sync=, sync? sync?, unbuffered_close unbuffered_close, unbuffered_flush unbuffered_flush, unbuffered_read(slice : Slice(UInt8)) unbuffered_read, unbuffered_rewind unbuffered_rewind, unbuffered_write(slice : Slice(UInt8)) unbuffered_write, write(slice : Slice(UInt8)) write

Instance methods inherited from module IO

<<(obj) : self <<, close close, cooked(&block) cooked, cooked! cooked!, each_byte
each_byte(&block)
each_byte
, each_char(&block)
each_char
each_char
, each_line(*args, &block)
each_line(*args)
each_line
, flush flush, gets(limit : Int) : String | Nil
gets(delimiter : Char, limit : Int) : String | Nil
gets(delimiter : Char) : String | Nil
gets : String | Nil
gets(delimiter : String) : String | Nil
gets
, gets_to_end : String gets_to_end, print(*objects : _) : Nil
print(obj) : Nil
print
, printf(format_string, args : Array | Tuple) : Nil
printf(format_string, *args) : Nil
printf
, puts : Nil
puts(*objects : _) : Nil
puts(string : String) : Nil
puts(obj) : Nil
puts
, raw(&block) raw, raw! raw!, read(slice : Slice(UInt8)) read, read_byte : UInt8 | Nil read_byte, read_bytes(type, format = IO::ByteFormat::SystemEndian : IO::ByteFormat) read_bytes, read_char : Char | Nil read_char, read_fully(slice : Slice(UInt8)) read_fully, read_line(*args) : String | Nil read_line, read_nonblock(size) read_nonblock, skip(bytes_count : Int) : Nil skip, tty? : Bool tty?, write(slice : Slice(UInt8)) : Nil write, write_byte(byte : UInt8) write_byte, write_bytes(object, format = IO::ByteFormat::SystemEndian : IO::ByteFormat) write_bytes

Class methods inherited from module IO

copy(src, dst) copy, pipe(read_blocking = false, write_blocking = false, &block)
pipe(read_blocking = false, write_blocking = false)
pipe
, select(read_ios, write_ios, error_ios, timeout_sec : LibC::TimeT | Int | Float | Nil)
select(read_ios, write_ios = nil, error_ios = nil)
select

Instance methods inherited from module JSON::Builder

json_array(&block) json_array, json_object(&block) json_object

Instance methods inherited from class Reference

! !, ==(other)
==(other : self)
==
, hash hash, inspect(io : IO) : Nil inspect, nil? nil?, object_id object_id, same?(other : Nil)
same?(other : Reference)
same?
, to_s(io : IO) : Nil to_s

Instance methods inherited from class Object

! !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other) ===, =~(other) =~, class class, clone clone, crystal_type_id crystal_type_id, dup dup, hash hash, inspect
inspect(io : IO)
inspect
, itself itself, not_nil! not_nil!, tap(&block) tap, to_json to_json, to_pretty_json(io : IO)
to_pretty_json
to_pretty_json
, to_s
to_s(io : IO)
to_s
, to_yaml(io : IO)
to_yaml
to_yaml
, try(&block) try

Class methods inherited from class Object

==(other : Class) ==, ===(other) ===, cast(other) : self cast, from_json(string_or_io) from_json, from_yaml(string : String) from_yaml, hash hash, inspect(io) inspect, name : String name, to_s(io) to_s

Class Method Detail

def self.open(filename, &block) #

Creates a file with filename, and yields it to the given block. It is closed and returned at the end of this method call.

tempfile = Tempfile.open("foo") { |file|
  file.print("bar")
}
File.read(tempfile.path) # => "bar"

[View source]
def self.new(name) #

Creates a Tempfile with the given filename.


[View source]

Instance Method Detail

def delete #

Deletes this tempfile.


[View source]
def path #

Retrives the full path of a this tempfile.

Tempfile.new("foo").path # => "/tmp/foo.ulBCPS"

[View source]
def unlink #

Deletes this tempfile.


[View source]