英文:
Unmarshal JSON into Golang type Big.Float
问题
我有一个需要将其解组为具有一些来自math包的big.Float字段的结构体的JSON消息。JSON字段的类型是数字类型。它给出了err = json: cannot unmarshal string into Go value of type *big.Float的错误。
我想知道为什么它会抱怨"无法解组字符串"，因为我的JSON字段是数字类型。我需要做什么才能将JSON字段解组为*big.Float字段。
示例：
type Msg struct {
Usage0 *big.Float
Usage1 *big.Float
Usage2 *big.Float
}
// jsonMsg = {'Usage0': 31241.4543, "Usage1": 54354325423.65, ...}
err := json.Unmarshal(jsonMsg, &msg)
英文:
I have a json message that needs to be unmarshaled to a struct which has some big.Float fields from the math package. The json field is of type numeric. It gives me err = json: cannot unmarshal string into Go value of type *big.Float.
I wonder why it complains "cannot unmarshal string" since my json field is numeric type. And what do I need to do to unmarshal the json filed to a *big.Float field.
Example:
type Msg struct {
Usage0 *big.Float
Usage1 *big.Float
Usage2 *big.Float
}
// jsonMsg = {'Usage0': 31241.4543, "Usage1": 54354325423.65, ...}
err := json.Unmarshal(jsonMsg, &msg)
答案1
得分: 8
根据文档，我认为它期望将big.Float的JSON作为字符串传递。这个示例证明了这种方法的可行性：
https://play.golang.org/p/7XKn2hhXRD
如果你无法控制JSON的格式，你可以实现自己的解码器作为替代方案。
英文:
It appears to me (based on the docs) that it expects the json for big.Float to be passed in as strings. This play proves that to work:
https://play.golang.org/p/7XKn2hhXRD
If you cannot control the json then you can implement your own unmarshaller as an alternative.
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