hmFS.read(fileId, buffer, position, length)

For an introduction to the Zepp OS Mini Program file system, please refer to File System.

Reads data from the file that in the given buffer.

Type

(fileId: number, buffer: ArrayBuffer, position: number, length: number) => result

Parameters

Parameters	Description	Required	Type	Default
fileId	file handle	yes	number	-
buffer	The buffer that will be filled with the read file data	yes	ArrayBuffer	-
position	Offset based on buff first address	yes	number	-
length	the number of bytes to read	yes	number	-

result

Parameters	Description	Type
result	The result of the operation, 0 means success	number

Please refer to File System - Error Code for the rest of the error codes.

Code example

const test_buf = new Uint8Array(10)
const test_buf2 = new Uint8Array(test_buf.length)

const file = hmFS.open('test_file.txt', hmFS.O_RDWR | hmFS.O_CREAT)
hmFS.read(file, test_buf2.buffer, 0, test_buf2.length)