I'm getting this error message : Invalid value for transfer when trying to use, for the very first time, the message-ports-reply-streams.
In preload.js I defined this api:
contextBridge.exposeInMainWorld(
"api", {
electronIpcPostMessage: (channel: string, message: any, transfer?: MessagePort[]) => {
ipcRenderer.postMessage(channel, message, transfer)
},
}
)
declare global {
interface Window {
api: {
electronIpcPostMessage: (channel: string, message: any, transfer?: MessagePort[]) => void;
}
}
And , following the example found here: https://www.electronjs.org/docs/latest/tutorial/message-ports#reply-streams , in the renderer React component I defined the streaming request as follows:
const Layers = () => {
const componentIsMounted = React.useRef(true)
React.useEffect(() => {
const cb = (event, args) => {
try {
if (componentIsMounted.current) {
console.log("react-leaflet-layers-args: ", args)
}
} catch (err) {
console.log("err: ", err)
}
}
const makeStreamingRequest = (element, cb) => {
// MessageChannels are lightweight--it's cheap to create a new one for each request.
const { port1, port2 } = new MessageChannel()
// We send one end of the port to the main process ...
window.api.electronIpcPostMessage(
'give-me-a-stream',
{ element, count: 10 },
[port2]
)
// ... and we hang on to the other end.
// The main process will send messages to its end of the port,
// and close it when it's finished.
port1.onmessage = (event) => {
cb(event.data)
}
port1.onclose = () => {
console.log('stream ended')
}
}
makeStreamingRequest(42, (data) => {
console.log('got response data:', event.data)
})
// We will see "got response data: 42" 10 times.
return () => { // clean-up function
componentIsMounted.current = false
window.api.electronIpcRemoveListener(
"give-me-a-stream",
cb,
)
}
}, [])
As said, when running Electron-React app the error message I get when accessing the page rendered by that component, is : Invalid value for transfer .
From this StackOverflow question : Invalid value for transfer while using ipcRenderer.postMessage of electron, it seems that I'm not the only one stumbling on this type of error, but I didn't find any solutions yet.
What am I doing wrongly or missing? How to solve the problem?
My objective is to send, better in a streaming fashion, a very big geojson file from the main process to the renderer process. That's why I thought to try to use ipcRenderer.postMessage.
By the way, any other working solutions that accomplish this goal, are welcomed.
Other info:
electron: v. 16
node: v. 16.13.0
O.S: Ubuntu 20.04
Looking forward to hints and help