Float64Array is converted to Uint8Array when sent over IPC

[vshymanskyy]

• Electron Version:
  v1.8.8, v3.1.4, v4.0.6
• Operating System:
  • Windows 10 (1803)

Expected Behavior

Float64Array and other Typed Arrays should preserve their type and correct values.

Actual Behavior

Main process sends an object with multiple Float64Array instances, Renderer gets all of them converted byte-wise to Uint8Array.

P.S. With electron 1.7.16 it was converted to Array with correct values.

May be related to #13055 or #6572

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[miniak]

@vshymanskyy what do you mean exactly by sent over IPC? Using ipcRenderer.send() / ipcMain.on() or the remote module?

[MrNovado]

@miniak having the same issue. It's ipcRenderer.send(). Also reproducible with Float32Array . "electron": "5.0.6", windows.

[miniak]

This is now natively supported in Electron 8

IPC between main and renderer processes now uses the Structured Clone Algorithm. #20214

This change cannot be backported to older major versions due to semver.

[miniak]

in older versions you can do this as the underlying ArrayBuffer is transferred:

main

const array = new Float64Array(10)
mainWindow.webContents.send('test', array, array.byteOffset, array.length)

renderer

ipcRenderer.on('test', (e, buffer, byteOffset, length) => {
  const array = new Float64Array(buffer.buffer, byteOffset, length)
  console.log('test', array)
})