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So I just spent an hour figuring out why I was getting an exception in my application when using a third party library to communicate to a credit card processing machine. I was getting a general exception back from the third party library, but the test software that comes with the library was working just fine.
Short answer, when I C&P'd my router's public IP address into the dialog box, there was a space at the end of the IP address. Took a while to spot:
Sigh. OK, so now I make sure to trim the IP address string (the third party library expects a string) and I suppose I should do some regex validation.
Still, why couldn't I get back an exception like "malformed IP address"? Why is the library so sensitive to an space at the end of string? Yes, I take some responsibility, but not all the responsibility!!!
when I C&P'd my router's public IP address into the dialog box
Copy & Paste, indeed! I expect more from you. You should be typing more. Trim()
I never trust user input because I used to do a lot of testing and open input boxes are the best way to break a program.
Summary, every time a cop didn't have the license plate for the ticket a NULL got entered into the database for the license plate. That meant all ticket fines got assigned to the owner with the license plate of NULL.
I faced something similar yesterday in one of my scripts. The string '1E2-' was validating as numeric...which it is...in hex!
To be fair, if the expression had been entered correctly as either '1' (a single position) or '1E2:-' (an expression) it would have been OK. However, it should have reported the expression error (missing param separator) instead of saving the incorrect value. It was a 10 minute fix and I caught it before the customer!
Stringly typing never seems to get out of fashion.Strict typing can be a pain at times, but in the end it's one of your strongest allies. Taking the lazy way out breeds so many small and large horrors, but why waste a thought on it when they waste other people's time?
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
Last Visit: 19-Feb-20 13:33 Last Update: 19-Feb-20 13:33