Check online

Getting Started
1

I need a way to have an event fire when a desktop app is online/offline, is their anything in Xojo that would tell me this or some other way of knowing?

2

The easiest way is to periodically check if you can reach a few websites. For instance,

api.ipify.org www.example.com

3

My preferred way is to use the HTTPSocket.GetHeader method. As long as the result is Nil, you’re offline. To be on the safe side, I usually do this with two different websites.

4

from : https://forum.xojo.com/36891-best-way-to-determine-internet-connection-vote-advice

Public Function IsInternetConnected() as Boolean
  ' checks if internet is connected by checking the connection to google,apple and microsoft
  ' fastest way found today
  ' see https://forum.xojo.com/36891-best-way-to-determine-internet-connection-vote-advice
  
  Dim http As New TCPSocket
  
  http.Address = "www.apple.com"
  http.port = 80
  http.Connect
  dim okapple as Boolean = (http.LastErrorCode = 0)
  http.close
  
  http.Address = "www.google.com"
  http.Connect
  dim okgoogle as Boolean = (http.LastErrorCode = 0)
  http.close
  
  http.Address = "www.microsoft.com"
  http.Connect
  dim okmicrosoft as Boolean = (http.LastErrorCode = 0)
  http.close
  
  Return okapple and okgoogle and okmicrosoft
  
End Function
5

Thanks everyone