fs.readv(fd, buffers[, position], callback)
fd
<integer>buffers
<ArrayBufferView[]>position
<integer>callback
<Function>err
<Error>bytesRead
<integer>buffers
<ArrayBufferView[]>
从 fd
指定的文件中读取并使用 readv()
写入 ArrayBufferView
数组。
position
是从文件开头应该读取数据的偏移量。
如果 typeof position !== 'number'
,则从当前位置读取数据。
回调将被赋予三个参数:err
、bytesRead
和 buffers
。
bytesRead
是从文件中读取的字节数。
如果此方法作为其 util.promisify()
版本被调用,则其将为具有 bytesRead
和 buffers
属性的 Object
返回 Promise
。
fd
<integer>buffers
<ArrayBufferView[]>position
<integer>callback
<Function>err
<Error>bytesRead
<integer>buffers
<ArrayBufferView[]>
Read from a file specified by fd
and write to an array of ArrayBufferView
s
using readv()
.
position
is the offset from the beginning of the file from where data
should be read. If typeof position !== 'number'
, the data will be read
from the current position.
The callback will be given three arguments: err
, bytesRead
, and
buffers
. bytesRead
is how many bytes were read from the file.
If this method is invoked as its util.promisify()
ed version, it returns
a Promise
for an Object
with bytesRead
and buffers
properties.