I/O 与网络

    Global variable referring to the standard out stream.

    Base.stderr — Constant

    Global variable referring to the standard error stream.

    Base.stdin — Constant

    1. stdin

    Global variable referring to the standard input stream.

    Base.open — Function

    1. open(f::Function, args...; kwargs...)

    Apply the function f to the result of open(args...; kwargs...) and close the resulting file descriptor upon completion.

    Examples

    1. julia> open("myfile.txt", "w") do io
    2.            write(io, "Hello world!")
    3.        end;
    5. julia> open(f->read(f, String), "myfile.txt")
    6. "Hello world!"
    8. julia> rm("myfile.txt")

    1. open(filename::AbstractString; lock = true, keywords...) -> IOStream

    Open a file in a mode specified by five boolean keyword arguments:

    The default when no keywords are passed is to open files for reading only. Returns a stream for accessing the opened file.

    The lock keyword argument controls whether operations will be locked for safe multi-threaded access.

    Julia 1.5

    The lock argument is available as of Julia 1.5.

    source

    1. open(filename::AbstractString, [mode::AbstractString]; lock = true) -> IOStream

    Alternate syntax for open, where a string-based mode specifier is used instead of the five booleans. The values of mode correspond to those from fopen(3) or Perl open, and are equivalent to setting the following boolean groups:

    The lock keyword argument controls whether operations will be locked for safe multi-threaded access.

    Examples

    1. julia> io = open("myfile.txt", "w");
    3. julia> write(io, "Hello world!");
    5. julia> close(io);
    7. julia> io = open("myfile.txt", "r");
    9. julia> read(io, String)
    10. "Hello world!"
    12. julia> write(io, "This file is read only")
    13. ERROR: ArgumentError: write failed, IOStream is not writeable
    14. [...]
    16. julia> close(io)
    18. julia> io = open("myfile.txt", "a");
    20. julia> write(io, "This stream is not read only")
    21. 28
    23. julia> close(io)
    25. julia> rm("myfile.txt")

    Julia 1.5

    The lock argument is available as of Julia 1.5.

    1. open(fd::OS_HANDLE) -> IO

    Take a raw file descriptor wrap it in a Julia-aware IO type, and take ownership of the fd handle. Call open(Libc.dup(fd)) to avoid the ownership capture of the original handle.

    Warning

    Do not call this on a handle that’s already owned by some other part of the system.

    source

    1. open(command, mode::AbstractString, stdio=devnull)

    Run command asynchronously. Like open(command, stdio; read, write) except specifying the read and write flags via a mode string instead of keyword arguments. Possible mode strings are:

    1. open(command, stdio=devnull; write::Bool = false, read::Bool = !write)

    Start running command asynchronously, and return a process::IO object. If read is true, then reads from the process come from the process’s standard output and stdio optionally specifies the process’s standard input stream. If write is true, then writes go to the process’s standard input and stdio optionally specifies the process’s standard output stream. The process’s standard error stream is connected to the current global stderr.

    source

    1. open(f::Function, command, args...; kwargs...)

    Similar to open(command, args...; kwargs...), but calls f(stream) on the resulting process stream, then closes the input stream and waits for the process to complete. Return the value returned by f on success. Throw an error if the process failed, or if the process attempts to print anything to stdout.

    Base.IOStream — Type

    1. IOStream

    A buffered IO stream wrapping an OS file descriptor. Mostly used to represent files returned by .

    source

    — Type

    1. IOBuffer([data::AbstractVector{UInt8}]; keywords...) -> IOBuffer

    Create an in-memory I/O stream, which may optionally operate on a pre-existing array.

    It may take optional keyword arguments:

    • read, write, append: restricts operations to the buffer; see open for details.
    • truncate: truncates the buffer size to zero length.
    • maxsize: specifies a size beyond which the buffer may not be grown.
    • sizehint: suggests a capacity of the buffer (data must implement sizehint!(data, size)).

    When data is not given, the buffer will be both readable and writable by default.

    Examples

    1. julia> io = IOBuffer();
    3. julia> write(io, "JuliaLang is a GitHub organization.", " It has many members.")
    4. 56
    6. julia> String(take!(io))
    7. "JuliaLang is a GitHub organization. It has many members."
    9. julia> io = IOBuffer(b"JuliaLang is a GitHub organization.")
    10. IOBuffer(data=UInt8[...], readable=true, writable=false, seekable=true, append=false, size=35, maxsize=Inf, ptr=1, mark=-1)
    12. julia> read(io, String)
    13. "JuliaLang is a GitHub organization."
    15. julia> write(io, "This isn't writable.")
    16. ERROR: ArgumentError: ensureroom failed, IOBuffer is not writeable
    18. julia> io = IOBuffer(UInt8[], read=true, write=true, maxsize=34)
    19. IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=0, maxsize=34, ptr=1, mark=-1)
    21. julia> write(io, "JuliaLang is a GitHub organization.")
    22. 34
    24. julia> String(take!(io))
    25. "JuliaLang is a GitHub organization"
    27. julia> length(read(IOBuffer(b"data", read=true, truncate=false)))
    28. 4
    30. julia> length(read(IOBuffer(b"data", read=true, truncate=true)))
    31. 0

    source

    1. IOBuffer(string::String)

    Create a read-only IOBuffer on the data underlying the given string.

    Examples

    1. julia> io = IOBuffer("Haho");
    3. julia> String(take!(io))
    4. "Haho"
    6. julia> String(take!(io))
    7. "Haho"

    Base.take! — Method

    1. take!(b::IOBuffer)

    Obtain the contents of an IOBuffer as an array. Afterwards, the IOBuffer is reset to its initial state.

    Examples

    1. julia> io = IOBuffer();
    3. julia> write(io, "JuliaLang is a GitHub organization.", " It has many members.")
    4. 56
    6. julia> String(take!(io))
    7. "JuliaLang is a GitHub organization. It has many members."

    Base.fdio — Function

    1. fdio([name::AbstractString, ]fd::Integer[, own::Bool=false]) -> IOStream

    Create an object from an integer file descriptor. If own is true, closing this object will close the underlying descriptor. By default, an IOStream is closed when it is garbage collected. name allows you to associate the descriptor with a named file.

    source

    — Function

    1. flush(stream)

    Commit all currently buffered writes to the given stream.

    source

    — Function

    1. close(stream)

    Close an I/O stream. Performs a flush first.

    Base.write — Function

    1. write(io::IO, x)
    2. write(filename::AbstractString, x)

    Write the canonical binary representation of a value to the given I/O stream or file. Return the number of bytes written into the stream. See also to write a text representation (with an encoding that may depend upon io).

    The endianness of the written value depends on the endianness of the host system. Convert to/from a fixed endianness when writing/reading (e.g. using htol and ) to get results that are consistent across platforms.

    You can write multiple values with the same write call. i.e. the following are equivalent:

    1. write(io, x, y...)
    2. write(io, x) + write(io, y...)

    Examples

    Consistent serialization:

    1. julia> fname = tempname(); # random temporary filename
    3. julia> open(fname,"w") do f
    4.            # Make sure we write 64bit integer in little-endian byte order
    5.            write(f,htol(Int64(42)))
    6.        end
    7. 8
    9. julia> open(fname,"r") do f
    10.            # Convert back to host byte order and host integer type
    11.            Int(ltoh(read(f,Int64)))
    12.        end
    13. 42

    Merging write calls:

    1. julia> io = IOBuffer();
    3. julia> write(io, "JuliaLang is a GitHub organization.", " It has many members.")
    4. 56
    6. julia> String(take!(io))
    7. "JuliaLang is a GitHub organization. It has many members."
    9. julia> write(io, "Sometimes those members") + write(io, " write documentation.")
    10. 44
    12. julia> String(take!(io))
    13. "Sometimes those members write documentation."

    User-defined plain-data types without write methods can be written when wrapped in a Ref:

    1. julia> struct MyStruct; x::Float64; end
    3. julia> io = IOBuffer()
    4. IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=0, maxsize=Inf, ptr=1, mark=-1)
    6. julia> write(io, Ref(MyStruct(42.0)))
    7. 8
    9. julia> seekstart(io); read!(io, Ref(MyStruct(NaN)))
    10. Base.RefValue{MyStruct}(MyStruct(42.0))

    source

    — Function

    1. read(io::IO, T)

    Read a single value of type T from io, in canonical binary representation.

    Note that Julia does not convert the endianness for you. Use ntoh or for this purpose.

    1. read(io::IO, String)

    Read the entirety of io, as a String (see also readchomp).

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization");
    3. julia> read(io, Char)
    4. 'J': ASCII/Unicode U+004A (category Lu: Letter, uppercase)
    6. julia> io = IOBuffer("JuliaLang is a GitHub organization");
    8. julia> read(io, String)
    9. "JuliaLang is a GitHub organization"

    1. read(filename::AbstractString, args...)

    Open a file and read its contents. args is passed to read: this is equivalent to open(io->read(io, args...), filename).

    1. read(filename::AbstractString, String)

    Read the entire contents of a file as a string.

    source

    1. read(s::IO, nb=typemax(Int))

    Read at most nb bytes from s, returning a Vector{UInt8} of the bytes read.

    1. read(s::IOStream, nb::Integer; all=true)

    Read at most nb bytes from s, returning a Vector{UInt8} of the bytes read.

    If all is true (the default), this function will block repeatedly trying to read all requested bytes, until an error or end-of-file occurs. If all is false, at most one read call is performed, and the amount of data returned is device-dependent. Note that not all stream types support the all option.

    source

    1. read(command::Cmd)

    Run command and return the resulting output as an array of bytes.

    1. read(command::Cmd, String)

    Run command and return the resulting output as a String.

    source

    — Function

    1. read!(stream::IO, array::AbstractArray)
    2. read!(filename::AbstractString, array::AbstractArray)

    Read binary data from an I/O stream or file, filling in array.

    source

    — Function

    1. readbytes!(stream::IO, b::AbstractVector{UInt8}, nb=length(b))

    Read at most nb bytes from stream into b, returning the number of bytes read. The size of b will be increased if needed (i.e. if nb is greater than length(b) and enough bytes could be read), but it will never be decreased.

    source

    1. readbytes!(stream::IOStream, b::AbstractVector{UInt8}, nb=length(b); all::Bool=true)

    Read at most nb bytes from stream into b, returning the number of bytes read. The size of b will be increased if needed (i.e. if nb is greater than length(b) and enough bytes could be read), but it will never be decreased.

    If all is true (the default), this function will block repeatedly trying to read all requested bytes, until an error or end-of-file occurs. If all is false, at most one read call is performed, and the amount of data returned is device-dependent. Note that not all stream types support the all option.

    Base.unsafe_read — Function

    1. unsafe_read(io::IO, ref, nbytes::UInt)

    Copy nbytes from the IO stream object into ref (converted to a pointer).

    It is recommended that subtypes T<:IO override the following method signature to provide more efficient implementations: unsafe_read(s::T, p::Ptr{UInt8}, n::UInt)

    Base.unsafe_write — Function

    1. unsafe_write(io::IO, ref, nbytes::UInt)

    Copy nbytes from ref (converted to a pointer) into the IO object.

    It is recommended that subtypes T<:IO override the following method signature to provide more efficient implementations: unsafe_write(s::T, p::Ptr{UInt8}, n::UInt)

    Base.readeach — Function

    1. readeach(io::IO, T)

    Return an iterable object yielding .

    See also skipchars, , readuntil.

    Julia 1.6

    readeach requires Julia 1.6 or later.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization.\n It has many members.\n");
    3. julia> for c in readeach(io, Char)
    4.            c == '\n' && break
    5.            print(c)
    6.        end
    7. JuliaLang is a GitHub organization.

    Base.peek — Function

    1. peek(stream[, T=UInt8])

    Read and return a value of type T from a stream without advancing the current position in the stream.

    Examples

    1. julia> b = IOBuffer("julia");
    3. julia> peek(b)
    4. 0x6a
    6. julia> position(b)
    7. 0
    9. julia> peek(b, Char)
    10. 'j': ASCII/Unicode U+006A (category Ll: Letter, lowercase)

    Julia 1.5

    The method which accepts a type requires Julia 1.5 or later.

    Base.position — Function

    1. position(s)

    Get the current position of a stream.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization.");
    3. julia> seek(io, 5);
    5. julia> position(io)
    6. 5
    8. julia> skip(io, 10);
    10. julia> position(io)
    11. 15
    13. julia> seekend(io);
    14. julia> position(io)
    15. 35

    Base.seek — Function

    1. seek(s, pos)

    Seek a stream to the given position.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization.");
    3. julia> seek(io, 5);
    5. julia> read(io, Char)
    6. 'L': ASCII/Unicode U+004C (category Lu: Letter, uppercase)

    Base.seekstart — Function

    Seek a stream to its beginning.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization.");
    3. julia> seek(io, 5);
    5. julia> read(io, Char)
    6. 'L': ASCII/Unicode U+004C (category Lu: Letter, uppercase)
    8. julia> seekstart(io);
    10. julia> read(io, Char)
    11. 'J': ASCII/Unicode U+004A (category Lu: Letter, uppercase)

    Base.seekend — Function

    1. seekend(s)

    Seek a stream to its end.

    Base.skip — Function

    1. skip(s, offset)

    Seek a stream relative to the current position.

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization.");
    5. julia> skip(io, 10);
    7. julia> read(io, Char)
    8. 'G': ASCII/Unicode U+0047 (category Lu: Letter, uppercase)

    Base.mark — Function

    1. mark(s)

    Add a mark at the current position of stream s. Return the marked position.

    See also , reset, .

    source

    — Function

    1. unmark(s)

    Remove a mark from stream s. Return true if the stream was marked, false otherwise.

    See also mark, , ismarked.

    Base.reset — Function

    1. reset(s)

    Reset a stream s to a previously marked position, and remove the mark. Return the previously marked position. Throw an error if the stream is not marked.

    See also , unmark, .

    source

    — Function

    1. ismarked(s)

    Return true if stream s is marked.

    See also mark, , reset.

    Base.eof — Function

    1. eof(stream) -> Bool

    Test whether an I/O stream is at end-of-file. If the stream is not yet exhausted, this function will block to wait for more data if necessary, and then return false. Therefore it is always safe to read one byte after seeing eof return false. eof will return false as long as buffered data is still available, even if the remote end of a connection is closed.

    Base.isreadonly — Function

    1. isreadonly(io) -> Bool

    Determine whether a stream is read-only.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization");
    3. julia> isreadonly(io)
    4. true
    6. julia> io = IOBuffer();
    8. julia> isreadonly(io)
    9. false

    Base.iswritable — Function

    1. iswritable(io) -> Bool

    Return true if the specified IO object is writable (if that can be determined).

    Examples

    1. julia> open("myfile.txt", "w") do io
    2.            print(io, "Hello world!");
    3.            iswritable(io)
    4.        end
    5. true
    7. julia> open("myfile.txt", "r") do io
    8.            iswritable(io)
    9.        end
    10. false
    12. julia> rm("myfile.txt")

    Base.isreadable — Function

    1. isreadable(io) -> Bool

    Return true if the specified IO object is readable (if that can be determined).

    Examples

    1. julia> open("myfile.txt", "w") do io
    2.            print(io, "Hello world!");
    3.            isreadable(io)
    4.        end
    5. false
    7. julia> open("myfile.txt", "r") do io
    8.            isreadable(io)
    9.        end
    10. true
    12. julia> rm("myfile.txt")

    Base.isopen — Function

    1. isopen(object) -> Bool

    Determine whether an object - such as a stream or timer – is not yet closed. Once an object is closed, it will never produce a new event. However, since a closed stream may still have data to read in its buffer, use to check for the ability to read data. Use the FileWatching package to be notified when a stream might be writable or readable.

    Examples

    1. julia> io = open("my_file.txt", "w+");
    3. julia> isopen(io)
    4. true
    6. julia> close(io)
    8. julia> isopen(io)
    9. false

    source

    — Function

    1. fd(stream)

    Return the file descriptor backing the stream or file. Note that this function only applies to synchronous File‘s and IOStream‘s not to any of the asynchronous streams.

    source

    — Function

    1. redirect_stdio(;stdin=stdin, stderr=stderr, stdout=stdout)

    Redirect a subset of the streams stdin, stderr, stdout. Each argument must be an IOStream, TTY, Pipe, socket, or devnull.

    Julia 1.7

    redirect_stdio requires Julia 1.7 or later.

    source

    1. redirect_stdio(f; stdin=nothing, stderr=nothing, stdout=nothing)

    Redirect a subset of the streams stdin, stderr, stdout, call f() and restore each stream.

    Possible values for each stream are:

    • nothing indicating the stream should not be redirected.
    • path::AbstractString redirecting the stream to the file at path.
    • io an IOStream, TTY, Pipe, socket, or devnull.

    Examples

    1. julia> redirect_stdio(stdout="stdout.txt", stderr="stderr.txt") do
    2.            print("hello stdout")
    3.            print(stderr, "hello stderr")
    4.        end
    6. julia> read("stdout.txt", String)
    7. "hello stdout"
    9. julia> read("stderr.txt", String)
    10. "hello stderr"

    Edge cases

    It is possible to pass the same argument to stdout and stderr:

    1. julia> redirect_stdio(stdout="log.txt", stderr="log.txt", stdin=devnull) do
    2.     ...
    3. end

    However it is not supported to pass two distinct descriptors of the same file.

    1. julia> io1 = open("same/path", "w")
    3. julia> io2 = open("same/path", "w")
    5. julia> redirect_stdio(f, stdout=io1, stderr=io2) # not suppored

    Also the stdin argument may not be the same descriptor as stdout or stderr.

    1. julia> io = open(...)
    3. julia> redirect_stdio(f, stdout=io, stdin=io) # not supported

    Julia 1.7

    redirect_stdio requires Julia 1.7 or later.

    Base.redirect_stdout — Function

    1. redirect_stdout([stream]) -> stream

    Create a pipe to which all C and Julia level output will be redirected. Return a stream representing the pipe ends. Data written to stdout may now be read from the rd end of the pipe.

    Note

    stream must be a compatible objects, such as an IOStream, TTY, Pipe, socket, or devnull.

    See also .

    source

    — Method

    1. redirect_stdout(f::Function, stream)

    Run the function f while redirecting stdout to stream. Upon completion, is restored to its prior setting.

    source

    — Function

    1. redirect_stderr([stream]) -> stream

    Like redirect_stdout, but for .

    Note

    stream must be a compatible objects, such as an IOStream, TTY, Pipe, socket, or devnull.

    See also redirect_stdio.

    Base.redirect_stderr — Method

    1. redirect_stderr(f::Function, stream)

    Run the function f while redirecting to stream. Upon completion, stderr is restored to its prior setting.

    Base.redirect_stdin — Function

    1. redirect_stdin([stream]) -> stream

    Like , but for stdin. Note that the direction of the stream is reversed.

    Note

    stream must be a compatible objects, such as an IOStream, TTY, Pipe, socket, or devnull.

    See also .

    source

    — Method

    1. redirect_stdin(f::Function, stream)

    Run the function f while redirecting stdin to stream. Upon completion, is restored to its prior setting.

    source

    — Function

    1. readchomp(x)

    Read the entirety of x as a string and remove a single trailing newline if there is one. Equivalent to chomp(read(x, String)).

    Examples

    1. julia> open("my_file.txt", "w") do io
    2.            write(io, "JuliaLang is a GitHub organization.\nIt has many members.\n");
    3.        end;
    5. julia> readchomp("my_file.txt")
    6. "JuliaLang is a GitHub organization.\nIt has many members."
    8. julia> rm("my_file.txt");

    source

    — Function

    1. truncate(file, n)

    Resize the file or buffer given by the first argument to exactly n bytes, filling previously unallocated space with ‘\0’ if the file or buffer is grown.

    Examples

    1. julia> io = IOBuffer();
    3. julia> write(io, "JuliaLang is a GitHub organization.")
    4. 35
    6. julia> truncate(io, 15)
    7. IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=15, maxsize=Inf, ptr=16, mark=-1)
    9. julia> String(take!(io))
    10. "JuliaLang is a "
    12. julia> io = IOBuffer();
    14. julia> write(io, "JuliaLang is a GitHub organization.");
    16. julia> truncate(io, 40);
    18. julia> String(take!(io))
    19. "JuliaLang is a GitHub organization.\0\0\0\0\0"

    source

    — Function

    1. skipchars(predicate, io::IO; linecomment=nothing)

    Advance the stream io such that the next-read character will be the first remaining for which predicate returns false. If the keyword argument linecomment is specified, all characters from that character until the start of the next line are ignored.

    Examples

    1. julia> buf = IOBuffer("    text")
    2. IOBuffer(data=UInt8[...], readable=true, writable=false, seekable=true, append=false, size=8, maxsize=Inf, ptr=1, mark=-1)
    4. julia> skipchars(isspace, buf)
    5. IOBuffer(data=UInt8[...], readable=true, writable=false, seekable=true, append=false, size=8, maxsize=Inf, ptr=5, mark=-1)
    7. julia> String(readavailable(buf))
    8. "text"

    source

    — Function

    1. countlines(io::IO; eol::AbstractChar = '\n')

    Read io until the end of the stream/file and count the number of lines. To specify a file pass the filename as the first argument. EOL markers other than '\n' are supported by passing them as the second argument. The last non-empty line of io is counted even if it does not end with the EOL, matching the length returned by eachline and .

    To count lines of a String, countlines(IOBuffer(str)) can be used.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization.\n");
    3. julia> countlines(io)
    4. 1
    6. julia> io = IOBuffer("JuliaLang is a GitHub organization.");
    8. julia> countlines(io)
    9. 1
    11. julia> eof(io) # counting lines moves the file pointer
    12. true
    14. julia> io = IOBuffer("JuliaLang is a GitHub organization.");
    16. julia> countlines(io, eol = '.')
    17. 1

    source

    — Function

    1. PipeBuffer(data::Vector{UInt8}=UInt8[]; maxsize::Integer = typemax(Int))

    An IOBuffer that allows reading and performs writes by appending. Seeking and truncating are not supported. See for the available constructors. If data is given, creates a PipeBuffer to operate on a data vector, optionally specifying a size beyond which the underlying Array may not be grown.

    source

    — Function

    1. readavailable(stream)

    Read available buffered data from a stream. Actual I/O is performed only if no data has already been buffered. The result is a Vector{UInt8}.

    Warning

    The amount of data returned is implementation-dependent; for example it can depend on the internal choice of buffer size. Other functions such as read should generally be used instead.

    Base.IOContext — Type

    1. IOContext

    IOContext provides a mechanism for passing output configuration settings among methods.

    In short, it is an immutable dictionary that is a subclass of IO. It supports standard dictionary operations such as getindex, and can also be used as an I/O stream.

    Base.IOContext — Method

    1. IOContext(io::IO, KV::Pair...)

    Create an IOContext that wraps a given stream, adding the specified key=>value pairs to the properties of that stream (note that io can itself be an IOContext).

    • use (key => value) in io to see if this particular combination is in the properties set
    • use get(io, key, default) to retrieve the most recent value for a particular key

    The following properties are in common use:

    • :compact: Boolean specifying that values should be printed more compactly, e.g. that numbers should be printed with fewer digits. This is set when printing array elements. :compact output should not contain line breaks.
    • :limit: Boolean specifying that containers should be truncated, e.g. showing … in place of most elements.
    • :displaysize: A Tuple{Int,Int} giving the size in rows and columns to use for text output. This can be used to override the display size for called functions, but to get the size of the screen use the displaysize function.
    • :typeinfo: a Type characterizing the information already printed concerning the type of the object about to be displayed. This is mainly useful when displaying a collection of objects of the same type, so that redundant type information can be avoided (e.g. [Float16(0)] can be shown as “Float16[0.0]“ instead of “Float16[Float16(0.0)]“ : while displaying the elements of the array, the :typeinfo property will be set to Float16).
    • :color: Boolean specifying whether ANSI color/escape codes are supported/expected. By default, this is determined by whether io is a compatible terminal and by any --color command-line flag when julia was launched.

    Examples

    1. julia> io = IOBuffer();
    3. julia> printstyled(IOContext(io, :color => true), "string", color=:red)
    5. julia> String(take!(io))
    6. "\e[31mstring\e[39m"
    8. julia> printstyled(io, "string", color=:red)
    10. julia> String(take!(io))
    11. "string"
    1. julia> print(IOContext(stdout, :compact => false), 1.12341234)
    2. 1.12341234
    3. julia> print(IOContext(stdout, :compact => true), 1.12341234)
    4. 1.12341
    1. julia> function f(io::IO)
    2.            if get(io, :short, false)
    3.            else
    4.                print(io, "loooooong")
    5.            end
    6.        end
    7. f (generic function with 1 method)
    9. julia> f(stdout)
    10. loooooong
    11. julia> f(IOContext(stdout, :short => true))
    12. short

    Base.IOContext — Method

    1. IOContext(io::IO, context::IOContext)

    Create an IOContext that wraps an alternate IO but inherits the properties of context.

    Base.show — Method

    1. show([io::IO = stdout], x)

    Write a text representation of a value x to the output stream io. New types T should overload show(io::IO, x::T). The representation used by show generally includes Julia-specific formatting and type information, and should be parseable Julia code when possible.

    returns the output of show as a string.

    To customize human-readable text output for objects of type T, define show(io::IO, ::MIME"text/plain", ::T) instead. Checking the :compact IOContext property of io in such methods is recommended, since some containers show their elements by calling this method with :compact => true.

    See also , which writes un-decorated representations.

    Examples

    1. julia> show("Hello World!")
    2. "Hello World!"
    3. julia> print("Hello World!")
    4. Hello World!

    source

    — Function

    Print to a stream io, or return a string str, giving a brief description of a value. By default returns string(typeof(x)), e.g. Int64.

    For arrays, returns a string of size and type info, e.g. 10-element Array{Int64,1}.

    Examples

    1. julia> summary(1)
    2. "Int64"
    4. julia> summary(zeros(2))
    5. "2-element Vector{Float64}"

    Base.print — Function

    1. print([io::IO], xs...)

    Write to io (or to the default output stream if io is not given) a canonical (un-decorated) text representation. The representation used by print includes minimal formatting and tries to avoid Julia-specific details.

    print falls back to calling show, so most types should just define show. Define print if your type has a separate “plain” representation. For example, show displays strings with quotes, and print displays strings without quotes.

    Examples

    1. julia> print("Hello World!")
    2. Hello World!
    3. julia> io = IOBuffer();
    5. julia> print(io, "Hello", ' ', :World!)
    7. julia> String(take!(io))
    8. "Hello World!"

    source

    — Function

    1. println([io::IO], xs...)

    Print (using print) xs followed by a newline. If io is not supplied, prints to .

    See also printstyled to add colors etc.

    Examples

    1. julia> println("Hello, world")
    2. Hello, world
    4. julia> io = IOBuffer();
    6. julia> println(io, "Hello", ',', " world.")
    8. julia> String(take!(io))
    9. "Hello, world.\n"

    Base.printstyled — Function

    Print xs in a color specified as a symbol or integer, optionally in bold.

    Keyword color may take any of the values :normal, :default, :bold, :black, :blink, :blue, :cyan, :green, :hidden, :light_black, :light_blue, :light_cyan, :light_green, :light_magenta, :light_red, :light_yellow, :magenta, :nothing, :red, :reverse, :underline, :white, or :yellow or an integer between 0 and 255 inclusive. Note that not all terminals support 256 colors.

    Keywords bold=true, underline=true, blink=true are self-explanatory. Keyword reverse=true prints with foreground and background colors exchanged, and hidden=true should be invisibe in the terminal but can still be copied. These properties can be used in any combination.

    See also , println, .

    Julia 1.7

    Keywords except color and bold were added in Julia 1.7.

    source

    — Function

    1. sprint(f::Function, args...; context=nothing, sizehint=0)

    Call the given function with an I/O stream and the supplied extra arguments. Everything written to this I/O stream is returned as a string. context can be an IOContext whose properties will be used, a Pair specifying a property and its value, or a tuple of Pair specifying multiple properties and their values. sizehint suggests the capacity of the buffer (in bytes).

    The optional keyword argument context can be set to a :key=>value pair, a tuple of :key=>value pairs, or an IO or object whose attributes are used for the I/O stream passed to f. The optional sizehint is a suggested size (in bytes) to allocate for the buffer used to write the string.

    Julia 1.7

    Passing a tuple to keyword context requires Julia 1.7 or later.

    Examples

    1. julia> sprint(show, 66.66666; context=:compact => true)
    2. "66.6667"
    4. julia> sprint(showerror, BoundsError([1], 100))
    5. "BoundsError: attempt to access 1-element Vector{Int64} at index [100]"

    source

    — Function

    1. showerror(io, e)

    Show a descriptive representation of an exception object e. This method is used to display the exception after a call to throw.

    Examples

    1. julia> struct MyException <: Exception
    2.            msg::String
    3.        end
    5. julia> function Base.showerror(io::IO, err::MyException)
    6.            print(io, "MyException: ")
    7.            print(io, err.msg)
    8.        end
    10. julia> err = MyException("test exception")
    11. MyException("test exception")
    13. julia> sprint(showerror, err)
    14. "MyException: test exception"
    16. julia> throw(MyException("test exception"))
    17. ERROR: MyException: test exception

    Base.dump — Function

    1. dump(x; maxdepth=8)

    Show every part of the representation of a value. The depth of the output is truncated at maxdepth.

    Examples

    1. julia> struct MyStruct
    2.            x
    3.            y
    4.        end
    6. julia> x = MyStruct(1, (2,3));
    8. julia> dump(x)
    9. MyStruct
    10.   x: Int64 1
    11.   y: Tuple{Int64, Int64}
    12.     1: Int64 2
    13.     2: Int64 3
    15. julia> dump(x; maxdepth = 1)
    16. MyStruct
    17.   x: Int64 1
    18.   y: Tuple{Int64, Int64}

    Base.Meta.@dump — Macro

    1. @dump expr

    Show every part of the representation of the given expression. Equivalent to .

    source

    — Function

    1. readline(io::IO=stdin; keep::Bool=false)
    2. readline(filename::AbstractString; keep::Bool=false)

    Read a single line of text from the given I/O stream or file (defaults to stdin). When reading from a file, the text is assumed to be encoded in UTF-8. Lines in the input end with '\n' or "\r\n" or the end of an input stream. When keep is false (as it is by default), these trailing newline characters are removed from the line before it is returned. When keep is true, they are returned as part of the line.

    Examples

    1. julia> open("my_file.txt", "w") do io
    2.            write(io, "JuliaLang is a GitHub organization.\nIt has many members.\n");
    3.        end
    4. 57
    6. julia> readline("my_file.txt")
    7. "JuliaLang is a GitHub organization."
    9. julia> readline("my_file.txt", keep=true)
    10. "JuliaLang is a GitHub organization.\n"
    12. julia> rm("my_file.txt")

    source

    — Function

    1. readuntil(stream::IO, delim; keep::Bool = false)
    2. readuntil(filename::AbstractString, delim; keep::Bool = false)

    Read a string from an I/O stream or a file, up to the given delimiter. The delimiter can be a UInt8, AbstractChar, string, or vector. Keyword argument keep controls whether the delimiter is included in the result. The text is assumed to be encoded in UTF-8.

    Examples

    1. julia> open("my_file.txt", "w") do io
    2.            write(io, "JuliaLang is a GitHub organization.\nIt has many members.\n");
    3.        end
    4. 57
    6. julia> readuntil("my_file.txt", 'L')
    7. "Julia"
    9. julia> readuntil("my_file.txt", '.', keep = true)
    10. "JuliaLang is a GitHub organization."
    12. julia> rm("my_file.txt")

    source

    — Function

    1. readlines(io::IO=stdin; keep::Bool=false)
    2. readlines(filename::AbstractString; keep::Bool=false)

    Read all lines of an I/O stream or a file as a vector of strings. Behavior is equivalent to saving the result of reading readline repeatedly with the same arguments and saving the resulting lines as a vector of strings.

    Examples

    1. julia> open("my_file.txt", "w") do io
    2.            write(io, "JuliaLang is a GitHub organization.\nIt has many members.\n");
    3.        end
    4. 57
    6. julia> readlines("my_file.txt")
    7. 2-element Vector{String}:
    8.  "JuliaLang is a GitHub organization."
    9.  "It has many members."
    11. julia> readlines("my_file.txt", keep=true)
    12. 2-element Vector{String}:
    13.  "JuliaLang is a GitHub organization.\n"
    14.  "It has many members.\n"
    16. julia> rm("my_file.txt")

    Base.eachline — Function

    1. eachline(io::IO=stdin; keep::Bool=false)
    2. eachline(filename::AbstractString; keep::Bool=false)

    Create an iterable EachLine object that will yield each line from an I/O stream or a file. Iteration calls on the stream argument repeatedly with keep passed through, determining whether trailing end-of-line characters are retained. When called with a file name, the file is opened once at the beginning of iteration and closed at the end. If iteration is interrupted, the file will be closed when the EachLine object is garbage collected.

    To iterate over each line of a String, eachline(IOBuffer(str)) can be used.

    Examples

    1. julia> open("my_file.txt", "w") do io
    2.            write(io, "JuliaLang is a GitHub organization.\n It has many members.\n");
    3.        end;
    5. julia> for line in eachline("my_file.txt")
    6.            print(line)
    7.        end
    8. JuliaLang is a GitHub organization. It has many members.
    10. julia> rm("my_file.txt");

    source

    — Function

    1. displaysize([io::IO]) -> (lines, columns)

    Return the nominal size of the screen that may be used for rendering output to this IO object. If no input is provided, the environment variables LINES and COLUMNS are read. If those are not set, a default size of (24, 80) is returned.

    Examples

    1. julia> withenv("LINES" => 30, "COLUMNS" => 100) do
    2.            displaysize()
    3.        end
    4. (30, 100)

    To get your TTY size,

    1. julia> displaysize(stdout)
    2. (34, 147)

    source

    就像文本输出用 实现，用户自定义类型可以通过重载 show 来指定其文本化表示， Julia 提供了一个应用于富多媒体输出的标准化机制 （例如图片、格式化文本、甚至音频和视频），由以下三部分组成：

    • 函数 来请求一个 Julia 对象 x 最丰富的多媒体展示，并以纯文本作为后备模式。
    • 重载 show 允许指定用户自定义类型的任意多媒体表现形式（以标准MIME类型为键值）。
    • Multimedia-capable display backends may be registered by subclassing a generic type 并通过 pushdisplay 将其压进显示后端的栈中。

    基础 Julia 运行环境只提供纯文本显示， 但是更富的显示可以通过加载外部模块或者使用图形化 Julia 环境 （比如基于 IPython 的 IJulia notebook）来实现。

    — Type

    1. AbstractDisplay

    Abstract supertype for rich display output devices. TextDisplay is a subtype of this.

    Base.Multimedia.display — Function

    1. display(x)
    2. display(d::AbstractDisplay, x)
    3. display(mime, x)
    4. display(d::AbstractDisplay, mime, x)

    AbstractDisplay x using the topmost applicable display in the display stack, typically using the richest supported multimedia output for x, with plain-text output as a fallback. The display(d, x) variant attempts to display x on the given display d only, throwing a MethodError if d cannot display objects of this type.

    In general, you cannot assume that display output goes to stdout (unlike or show(x)). For example, display(x) may open up a separate window with an image. display(x) means “show x in the best way you can for the current output device(s).” If you want REPL-like text output that is guaranteed to go to stdout, use instead.

    There are also two variants with a mime argument (a MIME type string, such as "image/png"), which attempt to display x using the requested MIME type only, throwing a MethodError if this type is not supported by either the display(s) or by x. With these variants, one can also supply the “raw” data in the requested MIME type by passing x::AbstractString (for MIME types with text-based storage, such as text/html or application/postscript) or x::Vector{UInt8} (for binary MIME types).

    To customize how instances of a type are displayed, overload show rather than display, as explained in the manual section on .

    source

    — Function

    1. redisplay(x)
    2. redisplay(d::AbstractDisplay, x)
    3. redisplay(mime, x)
    4. redisplay(d::AbstractDisplay, mime, x)

    By default, the redisplay functions simply call display. However, some display backends may override redisplay to modify an existing display of x (if any). Using redisplay is also a hint to the backend that x may be redisplayed several times, and the backend may choose to defer the display until (for example) the next interactive prompt.

    Base.Multimedia.displayable — Function

    1. displayable(mime) -> Bool
    2. displayable(d::AbstractDisplay, mime) -> Bool

    Returns a boolean value indicating whether the given mime type (string) is displayable by any of the displays in the current display stack, or specifically by the display d in the second variant.

    Base.show — Method

    1. show(io::IO, mime, x)

    The functions ultimately call show in order to write an object x as a given mime type to a given I/O stream io (usually a memory buffer), if possible. In order to provide a rich multimedia representation of a user-defined type T, it is only necessary to define a new show method for T, via: show(io, ::MIME"mime", x::T) = ..., where mime is a MIME-type string and the function body calls write (or similar) to write that representation of x to io. (Note that the MIME"" notation only supports literal strings; to construct MIME types in a more flexible manner use MIME{Symbol("")}.)

    For example, if you define a MyImage type and know how to write it to a PNG file, you could define a function show(io, ::MIME"image/png", x::MyImage) = ... to allow your images to be displayed on any PNG-capable AbstractDisplay (such as IJulia). As usual, be sure to import Base.show in order to add new methods to the built-in Julia function show.

    Technically, the MIME"mime" macro defines a singleton type for the given mime string, which allows us to exploit Julia’s dispatch mechanisms in determining how to display objects of any given type.

    The default MIME type is MIME"text/plain". There is a fallback definition for text/plain output that calls show with 2 arguments, so it is not always necessary to add a method for that case. If a type benefits from custom human-readable output though, show(::IO, ::MIME"text/plain", ::T) should be defined. For example, the Day type uses 1 day as the output for the text/plain MIME type, and Day(1) as the output of 2-argument show.

    Container types generally implement 3-argument show by calling show(io, MIME"text/plain"(), x) for elements x, with :compact => true set in an passed as the first argument.

    source

    — Function

    1. showable(mime, x)

    Returns a boolean value indicating whether or not the object x can be written as the given mime type.

    (By default, this is determined automatically by the existence of the corresponding show method for typeof(x). Some types provide custom showable methods; for example, if the available MIME formats depend on the value of x.)

    Examples

    1. julia> showable(MIME("text/plain"), rand(5))
    2. true
    4. julia> showable("image/png", rand(5))
    5. false

    Base.repr — Method

    1. repr(mime, x; context=nothing)

    Returns an AbstractString or Vector{UInt8} containing the representation of x in the requested mime type, as written by (throwing a MethodError if no appropriate show is available). An AbstractString is returned for MIME types with textual representations (such as "text/html" or "application/postscript"), whereas binary data is returned as Vector{UInt8}. (The function istextmime(mime) returns whether or not Julia treats a given mime type as text.)

    The optional keyword argument context can be set to :key=>value pair or an IO or object whose attributes are used for the I/O stream passed to show.

    As a special case, if x is an AbstractString (for textual MIME types) or a Vector{UInt8} (for binary MIME types), the repr function assumes that x is already in the requested mime format and simply returns x. This special case does not apply to the "text/plain" MIME type. This is useful so that raw data can be passed to display(m::MIME, x).

    In particular, repr("text/plain", x) is typically a “pretty-printed” version of x designed for human consumption. See also repr(x) to instead return a string corresponding to that may be closer to how the value of x would be entered in Julia.

    Examples

    1. julia> A = [1 2; 3 4];
    3. julia> repr("text/plain", A)
    4. "2×2 Matrix{Int64}:\n 1  2\n 3  4"

    source

    — Type

    1. MIME

    A type representing a standard internet data format. “MIME” stands for “Multipurpose Internet Mail Extensions”, since the standard was originally used to describe multimedia attachments to email messages.

    A MIME object can be passed as the second argument to show to request output in that format.

    Examples

    1. julia> show(stdout, MIME("text/plain"), "hi")
    2. "hi"

    Base.Multimedia.@MIME_str — Macro

    1. @MIME_str

    A convenience macro for writing types, typically used when adding methods to show. For example the syntax show(io::IO, ::MIME"text/html", x::MyType) = ... could be used to define how to write an HTML representation of MyType.

    如上面提到的，用户可以定义新的显示后端。 例如，可以在窗口显示 PNG 图片的模块可以在 Julia 中注册这个能力， 以便为有 PNG 表示的类型调用 display(x) 时可以在模块窗口中自动显示图片。

    In order to define a new display backend, one should first create a subtype D of the abstract class . Then, for each MIME type (mime string) that can be displayed on D, one should define a function display(d::D, ::MIME"mime", x) = ... that displays x as that MIME type, usually by calling show(io, mime, x) or . A MethodError should be thrown if x cannot be displayed as that MIME type; this is automatic if one calls show or repr. Finally, one should define a function display(d::D, x) that queries for the mime types supported by D and displays the “best” one; a MethodError should be thrown if no supported MIME types are found for x. Similarly, some subtypes may wish to override redisplay(d::D, …). (Again, one should import Base.display to add new methods to display.) The return values of these functions are up to the implementation (since in some cases it may be useful to return a display “handle” of some type). The display functions for D can then be called directly, but they can also be invoked automatically from simply by pushing a new display onto the display-backend stack with:

    Base.Multimedia.pushdisplay — Function

    1. pushdisplay(d::AbstractDisplay)

    Pushes a new display d on top of the global display-backend stack. Calling display(x) or display(mime, x) will display x on the topmost compatible backend in the stack (i.e., the topmost backend that does not throw a ).

    source

    — Function

    1. popdisplay()
    2. popdisplay(d::AbstractDisplay)

    Pop the topmost backend off of the display-backend stack, or the topmost copy of d in the second variant.

    source

    — Type

    1. TextDisplay(io::IO)

    Returns a TextDisplay <: AbstractDisplay, which displays any object as the text/plain MIME type (by default), writing the text representation to the given I/O stream. (This is how objects are printed in the Julia REPL.)

    source

    — Function

    1. istextmime(m::MIME)

    Determine whether a MIME type is text data. MIME types are assumed to be binary data except for a set of types known to be text data (possibly Unicode).

    Examples

    1. julia> istextmime(MIME("text/plain"))
    2. true
    4. julia> istextmime(MIME("image/png"))
    5. false

    source

    — Function

    1. bytesavailable(io)

    Return the number of bytes available for reading before a read from this stream or buffer will block.

    Examples

    1. julia> io = IOBuffer("JuliaLang is a GitHub organization");
    3. julia> bytesavailable(io)
    4. 34

    source

    — Function

    1. ntoh(x)

    Convert the endianness of a value from Network byte order (big-endian) to that used by the Host.

    source

    — Function

    1. hton(x)

    Convert the endianness of a value from that used by the Host to Network byte order (big-endian).

    source

    — Function

    1. ltoh(x)

    Convert the endianness of a value from Little-endian to that used by the Host.

    source

    — Function

      Convert the endianness of a value from that used by the Host to Little-endian.

      source

      — Constant

      1. ENDIAN_BOM

      The 32-bit byte-order-mark indicates the native byte order of the host machine. Little-endian machines will contain the value 0x04030201. Big-endian machines will contain the value .

      source