Exception handling with XML classes

Errors can occur while using XML built-in classes.

For example, calling methods of a SAX handler in an invalid order raises the runtime error -8004.

By default, the program stops in case of exception. XML errors can be trapped with the WHENEVER ERROR or TRY/CATCH exception handlers of Genero. If an error occurs during a method call of an XML class, the runtime system sets the status variable.

This code example shows the trapping of XML classes errors.

MAIN
  DEFINE w om.SaxDocumentHandler
  LET w = om.SaxDocumentHandler.createFileWriter("sample.xml")
  TRY
    CALL w.endDocument()
  CATCH
    DISPLAY "ERROR: ", status
  END TRY
END