iOS Question Reason for crashed APP

[Nitin Joshi]

Thread is related to B4i APP.
When i clicked on button, APP gets crashed (completely closed, not even at background). I am not getting any message or information in log, so, is there way to know the reason?

By the way, for B4A it is working fine. I am using B4XPages.

 

[Alexander Stolte]

Does the button have code that it executes? then I would comment it out and try again. If it still crashes then I understand your question, but if not then you have clearly given too little information.

 

[Nitin Joshi]

Does the button have code that it executes?

No, not even excuting first line as first line after button click event is log("here"). I can not even get "here" message in log.

 

[Erel]

1. Post the code of this button event.

2. Might be more information in the device logs: https://www.b4x.com/android/forum/threads/tip-on-device-logs.156056/#content

 

[Nitin Joshi]

Ok and thank you @Erel
I will check tonight and update here.

 

[Nitin Joshi]

@Erel, i could get logs however it was too hard for me to find the root cause from logs....
Meanwhile, i myself debugged the code and resolved the issue, thank you for your support.

 

[Nitin Joshi]

@Erel B4i APP was crashing because i want to close UDPSkt while page disappears. what could be the reason? by the way, its not happening for B4A.

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    Dim UDPSkt As UDPSocket
End Sub

Private Sub B4XPage_Appear()
    UDPSkt.Initialize("UDP", 4211, 255)
End Sub


Private Sub B4XPage_Disappear
    UDPSkt.Close
End Sub

 

[Erel]

Not enough information here to help you, however it looks like a mistake to start and stop the UDP socket based on the page visibility. Start it once and keep it open as long as the process is running.

 

[Nitin Joshi]

Start it once and keep it open as long as the process is running.

Do i need to stop (UDP_Skt.close) in page disappear event i. e. Switching from one page to another?

 

[Erel]

No. Don't stop it all.

With B4XPages the pages are never paused. Unlike with B4A activities.

 

[Nitin Joshi]

Ok, noted with thanks...