# FileSystemManager.appendFile(Object object)

Start from base library version 2.1.0. 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

Append content at the end of the file

# parameter

# Object object

attribute	type	Default values	Required	Introductions
filePath	string		yes	File path to append content (Local path)
data	string/ArrayBuffer		yes	Text or binary data to append
encoding	string	utf8	no	Specifies the character encoding for writing to the file
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
ascii
base64
binary
hex
ucs2	Read in small endorder
ucs-2	Read in small endorder
Utf16le	Read in small endorder
utf-16le	Read in small endorder
utf-8
utf8
latin1

# 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 ${filePath}	Specified filePath File does not exist
fail illegal operation on a directory, open "${filePath}"	Specified filePath It's an existing directory.
fail permission denied, open ${dirPath}	Specified filePath Path does not have write permissions
fail sdcard not mounted	Android sdcard Mount failure

# sample code

const fs = wx.getFileSystemManager()

fs.appendFile({
  filePath: `${wx.env.USER_DATA_PATH}/hello.txt`, 
  data: 'some text',
  encoding: 'utf8',
  success(res) {
    console.log(res)
  },
  fail(res) {
    console.error(res)
  }
})

// Synchronous interface
try {
  fs.appendFileSync(`${wx.env.USER_DATA_PATH}/hello.txt`,  'some text', 'utf8')
} catch(e) {
  console.error(e)
}