NULL If a get string returns null, that pretty much means something went wrong and there are a few things that could go wrong.

如果GetSting返回，大致上表示的是出错了,这里有几种出错的地方。

哈佛公开课 - 计算机科学课程节选

Today, when things go wrong for a company at the FDA, the public is reliant on the company to explain why things went wrong.

FORBES: Bringing Sunshine Into The FDA's Black Box

If the FDA can point to a single contaminated piece of farmland and explain what went wrong, it will go a long way toward ensuring that the spinach is safe in the future.

FORBES: Magazine Article

My most recent trip to a retail sales conference, went flawlessly on the way out, which made me feel like things had to go wrong coming back.

FORBES: The Modern Business Traveler: Top 5 Things That Will Keep Your Travel on Track