When Xojo App Closes Without Exception

General
1

How do I locate an error in my code if my app just closes and crashes without an exception?

Thanks

2

did you put code in the UNHANDLED EXCEPTION event of the APP object?
this doesn’t ALWAYS catch things, but sometimes

here is what I have in most of my apps

  Dim d As New Date
  Dim f As New FolderItem
  f  = SpecialFolder.Desktop.Child(App.ExecutableFile.DisplayName+"_ERRORLOG.txt")
  If f.exists Then f.delete
  
  Dim t As TextOutputStream
  t=textoutputstream.create(f)
  
  If t = Nil Then Return False
  
  t.WriteLine "UnhandledException: " + Introspection.GetType(error).Name + EndOfLine
  t.WriteLine "Current date: " +  d.SQLDateTime + EndOfLine + EndOfLine
  t.WriteLine "Executable Name: " + App.ExecutableFile.DisplayName
  t.WriteLine "Executable Path: " + f.NativePath + EndOfLine
  t.WriteLine "Executable Size: " + Str( App.ExecutableFile.Length )
  t.WriteLine "Executable ModificationDate: " + App.ExecutableFile.ModificationDate.SQLDateTime
  t.WriteLine "Executable CreationDate: " + App.ExecutableFile.CreationDate.SQLDateTime + EndOfLine
  t.WriteLine "Call Stack: " + EndOfLine
  t.WriteLine "Stack: " + EndOfLine + Join( error.Stack, EndOfLine)
  t.Close
  
  myMsgBox "An error occured "+ Introspection.GetType(error).Name + "^^A error log has been saved under " + EndOfLine + f.NativePath  +"^^App will be closed.",16
  
  f.Launch
  
  Quit
3

I’m locking this thread, since the discussion is duplicated here:

https://forum.xojo.com/24031-when-xojo-app-closes-without-exception