RTCDataChannel.binaryType - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Draft

This page is not complete.

The property binaryType on the RTCDataChannel interface is a DOMString which specifies the type of JavaScript object which should be used to represent binary data received on the RTCDataChannel. Values allowed by the WebSocket.binaryType property are also permitted here: "blob" if Blob objects are being used or "arraybuffer" if ArrayBuffer objects are being used. The default is "blob".

When a binary message is received on the data channel, the resulting message event's MessageEvent.data property is an object of the type specified by the binaryType.

Syntax

var type = aDataChannel.binaryType;

aDataChannel.binaryType = type;

Value

A DOMString that can have one of these values:

"blob"

Received binary messages' contents will be contained in Blob objects.

"arraybuffer"

Received binary messages' contents will be contained in ArrayBuffer objects.

Example

This code configures a data channel to receive binary data in ArrayBuffer objects, and establishes a listener for message events which constructs a string representing the received data as a list of hexadecimal byte values.

var dc = peerConnection.createDataChannel("Binary");
dc.binaryType = "arraybuffer";

dc.onmessage = function(event) {
  let byteArray = new Uint8Array(event.data);
  let hexString = "";

  byteArray.forEach(function(byte) {
    hexString += byte.toString(16) + " ";
  });
};

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• WebRTC
• Using WebRTC data channels
• RTCDataChannel
• RTCDataChannel.send()