问题描述
来自:
我遇到过这种情况,这会导致运行时恐慌。 / p>
我想知道的是,如果任何人都可以提供一个工作程序来演示json.Marshal返回非零错误的非紧急情况。最好的答案是显然包括使用的输入。
为了补充Jonathan的回答,json .Marshal函数可以返回两种类型的错误: UnsupportedTypeError
或 UnsupportedValueError
第一个是可能造成的,正如Jonathan所说,试图对一个无效类型进行编组:
_,err: = json.Marshal(make(chan int))
_,ok:= err。(* json.UnsupportedTypeError)// ok == true
另一方面,您也可以通过传递无效值来使Marshal函数返回错误:
_,err:= json.Marshal(math.Inf(1))
_,ok:= err。(* json.UnsupportedValueError)// ok == true
From the docs:
I've experienced this situation, which results in a runtime panic.
What I'm wondering is if anyone can provide a working program that demonstrates a non-panic situation where json.Marshal returns a non-nil error. The best answers would clearly include the inputs used.
Just to complement Jonathan's answer, the json.Marshal function can return two types of errors: UnsupportedTypeError
or UnsupportedValueError
The first one can be caused, as Jonathan said by trying to Marshal an invalid type:
_, err := json.Marshal(make(chan int))
_, ok := err.(*json.UnsupportedTypeError) // ok == true
On the other hand you can also have the Marshal function return an error by passing an invalid value:
_, err := json.Marshal(math.Inf(1))
_, ok := err.(*json.UnsupportedValueError) // ok == true
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