CODEWITHSUNDEEP
javascripthtmlelectronipc
Ahmetcan Aksu
Ahmetcan Aksu

Reputation: 73

Electron.js ipc.sendSync Frezees

Hi I'm requesting two results from the main process but when I click the button, the app keeps freezing. Even devtools is not working .

Main.js

ipcMain.on('fmail', (event, arg) => {
  var fmaile = even
  var fmaila = arg  

  ipcMain.on('fpass', (event, arg) => { 
    var fpasse = event
    var fpassa = arg

    console.log(fpassa)
    console.log(fmaila)

    fmaile.returnValue = "info"
    fpasse.returnValue = "info"
  })
})

Javascript

var datamail = ipcRenderer.sendSync('fmail', "fmail");
var datapass = ipcRenderer.sendSync('fpass', "fpass");
console.log(datamail)
console.log(datapass)

Thanks for help.

Upvotes: 6

Views: 5436

Answers (1)

pergy
pergy

Reputation: 5531

The docs is pretty clear on this one:

Sending a synchronous message will block the whole renderer process until the reply is received.

Since you don't provide a return value in your fmail callback, no wonder it blocks your app.

Also, I guess you wanted to register both listeners individually. What you currently have is "add listener to 'fpass' every time 'fmail' is called back"

Your code should probably look like this (but cannot tell exactly really)

ipcMain.on('fmail', (event, arg) => {
  console.log(arg)
  event.returnValue = "info"
})
ipcMain.on('fpass', (event, arg) => {
  console.log(arg)
  event.returnValue = "info"
})
console.log(
  ipcRenderer.sendSync('fmail', "fmail"),
  ipcRenderer.sendSync('fpass', "fpass")
)

Docs also mentions a more convenient alternative for such cases: Use invoke()

Upvotes: 10

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