string 给定字符串时 strconv.Atoi() 抛出错误
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strconv.Atoi() throwing error when given a string
提问by dead beef
When trying to use strconv on a variable passed via URL(GET variable named times), GoLang fails on compilation stating the following:
当尝试在通过 URL 传递的变量上使用 strconv（GET 变量命名时间）时，GoLang 编译失败，说明以下内容：
multiple-value strconv.Atoi() in a single-value context
单值上下文中的多值 strconv.Atoi()
However, when I do reflect.TypeOf I get string as the type, which to my understanding is the correct type of argument.
但是，当我进行reflect.TypeOf 时，我将字符串作为类型，据我所知，这是正确的参数类型。
I have been trying to fix this issue for several hours. I'm new to go and have become pretty frustrated with this problem. I finally decided to ask for help. Any feedback would be appreciated.
我一直试图解决这个问题几个小时。我是新手，对这个问题感到非常沮丧。我最终决定寻求帮助。对于任何反馈，我们都表示感谢。
func numbers(w http.ResponseWriter, req *http.Request) {
fmt.Println("GET params were:", req.URL.Query());
times := req.URL.Query()["times"][0]
time := strconv.Atoi(times)
reflect.TypeOf(req.URL.Query()["times"][0]) // returns string
}
回答by Cerise Limón
The error is telling you that the two return values from strconv.Atoi(intand error) are used in a single value context (the assignment to time). Change the code to:
该错误告诉您strconv.Atoi(int和error)的两个返回值用于单个值上下文（对 的赋值time）。将代码更改为：
time, err := strconv.Atoi(times)
if err != nil {
// handle error
}
回答by Thirumalai Parthasarathi
Although this has been answered and the question is quite old, I thought it would be nice to complement the accepted answer.
虽然这已经得到回答并且这个问题已经很老了，但我认为补充已接受的答案会很好。
When a function returns multiple values as in the question, if any of the value is not needed then they can be discarded by using the blank identifier_as in the following.
当函数返回问题中的多个值时，如果不需要任何值，则可以使用空白标识符来丢弃它们_，如下所示。
num, _ := strconv.Atoi(numAsString)
This would store the converted number in numbut discard the error by assigning it to the blank identifier.
这会将转换后的数字存储在其中，num但通过将其分配给空白标识符来丢弃错误。
But do note that once a value is assigned to _it cannot be referenced again. i.e.
但请注意，一旦为_它分配了一个值，就不能再次引用它。IE
num, _ := strconv.Atoi(numAsString)
fmt.Println(_) // won't compile. cannot reference _
