readAsArrayBuffer

Summary

Returns partial Blob data representing the number of bytes currently loaded (as a fraction of the total), as an ArrayBuffer object, a fixed-length binary data buffer.

Method of apis/file/FileReaderapis/file/FileReader

Syntax

var  = FileReader.readAsArrayBuffer(blob);

Parameters

blob

Data-type

Blob

Return Value

Returns an object of type DOM NodeDOM Node

Type: HRESULT

This method can return one of these values.

S_OK

Examples

var reader = new FileReader();

reader.onload = function(e) {
  var arrayBuffer = reader.result;
}

reader.readAsArrayBuffer(file);

Notes

This method asynchronously starts reading the contents of the specified File. When the read operation is finished, readyState will become DONE and the onloadend event handler (that is, callback), if present, will be invoked. At that time, the result attribute contains an array buffer object representing the file’s data.

Related specifications

W3C File API Specification

W3C Working Draft

Attributions

• Microsoft Developer Network: Windows Internet Explorer API reference Article