hmFS.read(fileId, buffer, position, length)
Read file
Type
(fileId: number, buffer: ArrayBuffer, position: number, length: number) => [fileList, err]
Parameters
| Parameters | Description | Required | Type | Default |
|---|---|---|---|---|
| fileId | file handle | yes | number | - |
| buff | The buffer that will be filled with the read file data | yes | ArrayBuffer | - |
| pos | Offset based on buff first address | yes | number | - |
| len | the number of bytes to read | yes | number | - |
fileList
| Description | Type |
|---|---|
| Array of filenames | Array<string> |
err
| Description | Type |
|---|---|
Error code, 0 means get success | number |
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)