# ReadResult FileSystemManager.readSync(Object object)

Start from base library version 2.16.1. Please remaining backward compatible.

with Promise style call: Not supported

Mini Program plugin: Support, need to Mini Program base library version no less than 2.19.2

Read Files

# parameter

# Object object

attribute	type	Default values	Required	Introductions
初始值	string		yes	File descriptor. fd adopt FileSystemManager.open or FileSystemManager.openSync Interface acquisition
arrayBuffer	ArrayBuffer		yes	The buffer to which the data is written must be ArrayBuffer Example
offset	number	0	no	Write offset in buffer, default 0
length	number	0	no	Number of bytes to read from the file, default 0
position	number		no	The starting position of a file read, such as no upload or upload Null, it is read from the position of the current file pointer. if position Is a positive integer, the file pointer position remains the same and is converted from the position Read the file.

# Return value

# ReadResult

File Read Results

# error

Error code	Error message	Introductions
	bad file descriptor	Invalid file descriptor
	fail permission denied	Specified fd Path not read
	fail the value of "offset" is out of range	Incoming offset illegal
	fail the value of "length" is out of range	Incoming length illegal
	fail sdcard not mounted	android sdcard Mount failure
	bad file descriptor	Invalid file descriptor

# sample code

const fs = wx.getFileSystemManager()
const ab = new ArrayBuffer(1024)
const fd = fs.openSync({
  filePath: `${wx.env.USER_DATA_PATH}/hello.txt`, 
  flag: 'a+'
})
const res = fs.readSync({
  fd: fd,
  arrayBuffer: AB,
  length: 10
})
console.log(res)