exception – Page 3 – Tarik Billa

UIPopoverPresentationController should have a non-nil sourceView or barButtonItem set before the presentation occurs on iOS 9

January 8, 2024 by Tarik

You can create a popover presentation controller like this also and it may work – (IBAction)showPopup:(UIButton *)sender { ViewController *contentViewController = [[ViewController alloc] init]; contentViewController.preferredContentSize = CGSizeMake(200, 200); contentViewController.modalPresentationStyle = UIModalPresentationPopover; UIPopoverPresentationController *popoverpresentationController = contentViewController.popoverPresentationController; popoverpresentationController.delegate = self; popoverpresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp; popoverpresentationController.sourceRect = sender.bounds; popoverpresentationController.sourceView = sender; [self presentViewController:contentViewController animated: YES completion: nil]; }

What does `at ReturnAddress` mean in Delphi?

January 8, 2024 by Tarik

ReturnAddress is the address to which VerifyWrite would have returned when finished. Raise Exception.Create… at ReturnAddress means that when the exception dialog is displayed, it would indicate the address of the exception as being at ReturnAddress. In other words, the exception message would read Exception <whatever> raised at <ReturnAddress>: <Exception Message>. Here is an excerpt … Read more

Detecting what the target object is when NullReferenceException is thrown

January 7, 2024 by Tarik

At the point where the NRE is thrown, there is no target object — that’s the point of the exception. The most you can hope for is to trap the file and line number where the exception occurred. If you’re having problems identifying which object reference is causing the problem, then you might want to … Read more

Best way to return status flag and message from a method in Java

January 7, 2024 by Tarik

Returning a small object with both the boolean flag and the String inside is probably the most OO-like way of doing it, although I agree that it seems overkill for a simple case like this. Another alternative is to always return a String, and have null (or an empty String – you choose which) indicate … Read more

How to design exception “types” in C++ [closed]

January 7, 2024 by Tarik

The C++ standard library’s exception hierarchy is IMHO pretty arbitrary and meaningless. For example, it would probably just create problems if anyone started actually using e.g. std::logic_error instead of terminating when it’s clear that the program has a Very Nasty Bug™. For as the standard puts it, “The distinguishing characteristic of logic errors is that … Read more

How to imitate Python 3’s raise … from in Python 2?

January 7, 2024 by Tarik

There’s a raise_from in python-future; simply install it pip install future and import to use from future.utils import raise_from # or: from six import reraise as raise_from class FileDatabase: def __init__(self, filename): try: self.file = open(filename) except IOError as exc: raise_from(DatabaseError(‘failed to open’), exc) UPDATE The compatibility package six also supports raise_from, from version 1.9 … Read more

(Kotlin) Backend Internal error: Exception during code generation

January 7, 2024 by Tarik

Ensuring that Exceptions are always caught

January 7, 2024 by Tarik

No. See A Pragmatic Look at Exception Specifications for reasons why not. The only way you can “help” this is to document the exceptions your function can throw, say as a comment in the header file declaring it. This is not enforced by the compiler or anything. Use code reviews for that purpose.

Handling a Python exception that occurs within an except clause

January 6, 2024 by Tarik

I believe what you’re seeing is the result of exception chaining, which is a change in Python 3. From the Motivation section of the PEP: During the handling of one exception (exception A), it is possible that another exception (exception B) may occur. In today’s Python (version 2.4), if this happens, exception B is propagated … Read more

python – specifically handle file exists exception

January 5, 2024 by Tarik

According to the code print …, it seems like you’re using Python 2.x. FileExistsError was added in Python 3.3; You can’t use FileExistsError. Use errno.EEXIST: import os import errno try: os.mkdir(folderPath) except OSError as e: if e.errno == errno.EEXIST: print(‘Directory not created.’) else: raise