I need to catch some warnings being thrown from some php native functions and then handle them. Specifically: array dns_get_record ( string $hostname [, int $type= DNS_ANY [, array &$authns [, array &$addtl ]]] ) It throws a warning when the DNS query fails. try/catch doesn’t work because a warning is not an exception. I … Read more
I have always been of the belief that if a method can throw an exception then it is reckless not to protect this call with a meaningful try block. I just posted ‘You should ALWAYS wrap calls that can throw in try, catch blocks.‘ to this question and was told that it was ‘remarkably bad … Read more
I want to write trycatch code to deal with error in downloading from the web. url <- c( “http://stat.ethz.ch/R-manual/R-devel/library/base/html/connections.html”, “http://en.wikipedia.org/wiki/Xz”) y <- mapply(readLines, con=url) These two statements run successfully. Below, I create a non-exist web address: url <- c(“xxxxx”, “http://en.wikipedia.org/wiki/Xz”) url[1] does not exist. How does one write a trycatch loop (function) so that: When … Read more
From time to time in Python, I see the block: try: try_this(whatever) except SomeException as exception: #Handle exception else: return something What is the reason for the try-except-else to exist? I do not like that kind of programming, as it is using exceptions to perform flow control. However, if it is included in the language, … Read more
I’m looking at the article C# – Data Transfer Object on serializable DTOs. The article includes this piece of code: public static string SerializeDTO(DTO dto) { try { XmlSerializer xmlSer = new XmlSerializer(dto.GetType()); StringWriter sWriter = new StringWriter(); xmlSer.Serialize(sWriter, dto); return sWriter.ToString(); } catch(Exception ex) { throw ex; } } The rest of the article … Read more
In Java, I want to do something like this: try { … } catch (/* code to catch IllegalArgumentException, SecurityException, IllegalAccessException, and NoSuchFieldException at the same time */) { someCode(); } …instead of: try { … } catch (IllegalArgumentException e) { someCode(); } catch (SecurityException e) { someCode(); } catch (IllegalAccessException e) { someCode(); } … Read more
I want to catch and log exceptions without exiting, e.g., try: do_stuff() except Exception as err: print(Exception, err) # I want to print the entire traceback here, # not just the exception name and details I want to print the exact same output that is printed when the exception is raised without the try/except intercepting … Read more
I wrote some code for testing the impact of try-catch, but seeing some surprising results. static void Main(string[] args) { Thread.CurrentThread.Priority = ThreadPriority.Highest; Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.RealTime; long start = 0, stop = 0, elapsed = 0; double avg = 0.0; long temp = Fibo(1); for (int i = 1; i < 100000000; i++) { start … Read more
Is there a method that I can call that will tell me if Integer.parseInt() will throw a NumberFormatException before calling it? Then I would have no problem logging this, since it should never happen. Sadly, no. At least not in the core Java API. It’s easy to write one, however – just modify the code … Read more
While reading from the file, your are not terminating your loop. So its read all the values and correctly throws EOFException on the next iteration of the read at line below: If you read the documentation, it says: Throws: EOFException – if this input stream reaches the end before reading eight bytes. IOException – the stream has … Read more
