Exception handling fails - Help!

[Ricardo Canelas]

Hey all,

I'm having an issue. essentially:

! Load in the document

  myDoc => parseFile("h2o.xml", iostat=ios, ex=ex)

  if (inException(ex)) then

    print*,"DOM Parse error ", getExceptionCode(ex)

    stop

  else

    !stmg else

 endif

fails to catch the exception. If 'h2o.xml' doesn't exist a severe access violation aborts the execution. This happens across every functionality of FoX on my build, and I can't understand why.

I'm on windows, built the last github repo using cmake -> visual studio -> ifort 2017

Regards,

Ricardo

[Andrew Walker [EAR]]

Hi Ricardo,

Sorry about the delay in getting back to you. I don't get as much time to work on FoX as I once did.

I suspect there are a few things going on here. First, make sure that the 'ex' variable is not a pointer (that was the only way I could get a segmentation fault out of this). Second, you need to check the value of the 'ios' variable. If this optional argument is present and the file cannot be found that's the variable that gets set in the parseFIle function. If 'ios' is not present FoX will abort itself reporting that it "Cannot open file". This kind of error does not get attached the DOMException.

So, what I ended up with is:

program dom_open_errors_example

  use FoX_dom

  implicit none

  type(Node), pointer :: myDoc

  type(DOMException) :: ex

  integer :: ios

  myDoc => parseFile("h2o.xml", iostat=ios, ex=ex)

  if (ios.ne.0) then

      print*, "Problem reading file. iostat was ", ios

      stop

  elseif (inException(ex)) then

      print*,"DOM Parse error ", getExceptionCode(ex)

      stop

  else

      print*, "Not in exception and file read OK"

  endif

  ! Do something with myDoc

end program dom_open_errors_example

Hopefully this works for you. You should see a DOM Parse error if the XML file exists but is not well-formed XML, and a non-zero iostat (strictly with a machine-specific meaning) if the file cannot be read. One oddity to note is that if ex is not present but ios is, you may end up with a FoX error code in ios. That only happens if the file exists but it not well-formed XML.

I'll add an annotated version of this to the examples directory.

Best wishes,

Andrew

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