# FileSystemManager.readFile(Object object)

with Promise style call: Not supported

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

Read local file content

# parameter

# Object object

attribute type Default values Required Introductions Minimum version
filePath string yes Path to the file to read (Local path)
encoding string no Specifies the character encoding for the read file, if the Encoding, the ArrayBuffer Format to read the binary contents of a file
position number no Start reading from the specified location in the file or from the file header if not specified. Read range should be left closed and right open range [position, position+length)。有效范围:[0, fileLength - 1]. Unit: byte 2.10.0
length number no Specifies the length of the file, if not specified, read to the end of the document. Scope of validity:[1, fileLength]. Unit: byte 2.10.0
success function no Interface calls the successful callback function
fail function no Interface calls failed callback functions
complete function no Callback function at the end of an interface call (both successful and unsuccessful calls are executed)

object.encoding Legal value

value Introductions Minimum version
ucs2 Read in small endorder
ucs-2 Read in small endorder
Utf16le Read in small endorder
utf-16le Read in small endorder

# object.success callback

# parameter
# Object res
attribute type Introductions
data string/ArrayBuffer Document content

# object.fail callback

# parameter
# Object res
attribute type Introductions
errMsg string Error message

res.errMsg Legal value

value Introductions Minimum version
fail No such file or directory, open ${filePath} Specified filePath Directory does not exist
fail permission denied, open ${dirPath} Specified filePath Path not read
fail sdcard not mounted Android sdcard Mount failure

# sample code

const fs = wx.getFileSystemManager()
  filePath: `${wx.env.USER_DATA_PATH}/hello.txt`, 
  encoding: 'utf8',
  position: 0,
  success(res) {
  fail(res) {

// Synchronous interface
try {
  const res = fs.readFileSync(`${wx.env.USER_DATA_PATH}/hello.txt`,  'utf8', 0)
} catch(e) {