FileReaderSync: readAsArrayBuffer() method
The readAsArrayBuffer()
method of the FileReaderSync
interface allows to read File
or Blob
objects in a synchronous way into an ArrayBuffer
. This interface is only available in workers as it enables synchronous I/O that could potentially block.
Syntax
Parameters
blob
-
The File
or Blob
to read into the File
or ArrayBuffer
.
Return value
An ArrayBuffer
representing the file's data.
Exceptions
The following exceptions can be raised by this method:
-
NotFoundError
DOMException
-
Thrown if the resource represented by the DOM File
or Blob
cannot be found, e.g. because it has been erased.
-
SecurityError
DOMException
-
Thrown if one of the following problematic situation is detected:
- the resource has been modified by a third party;
- too many read are performed simultaneously;
- the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
-
NotReadableError
DOMException
-
Thrown if the resource cannot be read due to a permission problem, like a concurrent lock.
-
EncodingError
DOMException
-
Thrown if the resource is a data URL and exceed the limit length defined by each browser.
Specifications
Browser compatibility
|
Desktop |
Mobile |
|
Chrome |
Edge |
Firefox |
Internet Explorer |
Opera |
Safari |
WebView Android |
Chrome Android |
Firefox for Android |
Opera Android |
Safari on IOS |
Samsung Internet |
readAsArrayBuffer |
9 |
12 |
8 |
10 |
≤12.1 |
6 |
4.4 |
18 |
8 |
≤12.1 |
6 |
1.0 |
See also