分享

Write - Function Summary

 gearss 2021-11-12

--------------------------------------------------------------------------------

Summary:

Writes to a file, url, or port-spec (block or object).

Usage:

write destination value

Arguments:

destination - The destination argument. (must be: file url object block) 

value - The value argument. 

Refinements:

/binary - Preserves contents exactly. 

/string - Translates all line terminators. 

/direct - Opens the port without buffering. 

/append - Writes to the end of an existing file. 

/no-wait - Returns immediately without waiting if no data. 

/lines - Handles data as lines. 

/part - Reads a specified amount of data. 

size - The size argument. (must be: number) 

/with - Specifies alternate line termination. 

end-of-line - The end-of-line argument. (must be: char string) 

/allow - Specifies the protection attributes when created. 

access - The access argument. (must be: block) 

/mode - Block of above refinements. 

args - The args argument. (must be: block) 

/custom - Allows special refinements. 

params - The params argument. (must be: block) 

Description:

WRITE is typically used to write a file to disk, but many other operations, such as writing data to URLs and ports, are possible. 

Normally a string or binary value is provided to this function, but other types of data such as a number or a time can be written. They will be converted to text. 

The /BINARY refinement will write out data as its exact representation. This is good for writing image, sound and other binary data. 

The /STRING refinement translates line terminators to the operating system's line terminator. This behavior is default. 

The /APPEND refinement is useful logging purposes, as it won't overwrite existing data. 

The /LINES refinement can take a block of values and will write each value to a line. By default, WRITE will write the block of values as a concatonated string of formed values. 

The /PART refinement will read the specified number of elements from the data being written. The /WITH refinement converts characters, or strings, specified into line terminators. 

See the User's Guide for more detailed explanation of using READ and its refinements. 

    write %junkme.txt "This is a junk file."

    write %datetime.txt now

    write/binary %data compress "this is compressed data"

    write %rebol-test-file.r "some text"

    print read %rebol-test-file.r

    some text

    write/append %rebol-test-file.r "some more text"

    print read %rebol-test-file.r

    some textsome more text

    write %rebol-test-file.r reduce ["the time is:" form now/time]

    print read %rebol-test-file.r

    the time is:1:00:40

    write/lines %rebol-test-file.r reduce ["time is:" form now/time]

    print read %rebol-test-file.r

    time is:

    1:00:40

    write/part %rebol-test-file.r "this is the day!" 7

    print read %rebol-test-file.r

    this is

Related:

close - Closes an open port connection.

form - Converts a value to a string.

get-modes - Returns mode settings for a port.

load - Loads a file, URL, or string. Binds words to global context.

open - Opens a new port connection.

read - Reads from a file, url, or port-spec (block or object).

save - Saves a value or a block to a file or url.

set-modes - Changes mode settings for a port.

--------------------------------------------------------------------------------

<Back | Index | Next>  Copyright 2004 REBOL Technologies

    本站是提供个人知识管理的网络存储空间,所有内容均由用户发布,不代表本站观点。请注意甄别内容中的联系方式、诱导购买等信息,谨防诈骗。如发现有害或侵权内容,请点击一键举报。
    转藏 分享 献花(0

    0条评论

    发表

    请遵守用户 评论公约

    类似文章 更多