去xml解析“看不到”任何领域 [英] go xml parsing "doesn't see" any fields

问题描述

我必须错过一些非常明显的东西......我尝试解析一个简单的XML文件，按照 ExampleUnmarshal（）的例子在这里： http://golang.org/src/pkg/encoding/xml/example_test.go

I must be missing something really obvious... Am trying to parse a simple XML file, following the example from ExampleUnmarshal() in here: http://golang.org/src/pkg/encoding/xml/example_test.go

正如您在底部看到的，没有任何属性或子元素正在映射 - 无论是方向还是元帅还是Unmarshal。从我可以告诉的这几乎是他们在上面的example_test.go中完全相同的事情（我能看到的唯一区别是那个测试中的类型在函数的范围内 - 我试过了，没有区别，他们使用子元素而不是属性 - 除了 id - 但是每个 doc name，attr should work afaict）。

As you'll see at the bottom of this, none of the attributes or child elements are being mapped - either direction - Marshal or Unmarshal. From what I can tell this is almost the exact same thing they are doing in example_test.go above (the only differences I can see are the that types in that test are within the scope of the function - which I tried, makes no diff, and they are using child elements and not attributes - except for id - but per doc name,attr should work afaict).

代码如下所示：

Code looks like this:

package main

import (
    "fmt"
    "encoding/xml"
    "io/ioutil"
)


type String struct {
    XMLName xml.Name `xml:"STRING"`
    lang  string   `xml:"lang,attr"`
    value  string   `xml:"value,attr"`
}

type Entry struct {
    XMLName xml.Name `xml:"ENTRY"`
    id      string  `xml:"id,attr"`
    strings []String 
}

type Dictionary struct {
    XMLName xml.Name `xml:"DICTIONARY"`
    thetype  string   `xml:"type,attr"`
    ignore  string   `xml:"ignore,attr"`
    entries []Entry  
}

func main() {

    dict := Dictionary{}

    b := []byte(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<DICTIONARY type="multilanguage" ignore="en">
  <ENTRY id="ActionText.Description.AI_ConfigureChainer">
    <STRING lang="en" value="ActionText.Description.AI_ConfigureChainer"/>
    <STRING lang="da" value=""/>
    <STRING lang="nl" value=""/>
    <STRING lang="fi" value=""/>
  </ENTRY>
</DICTIONARY>
`)

    err := xml.Unmarshal(b, &dict)
    if err != nil { panic(err) }

    fmt.Println(dict) // prints: {{ DICTIONARY}   []}

    dict.ignore = "test"

    out, err := xml.MarshalIndent(&dict, "  ", "    ")
    fmt.Println(string(out)) // prints:   <DICTIONARY></DICTIONARY>

    // huh?

}

推荐答案

导出（大写）您的结构字段。

You need to Export (Capitalize) your struct fields.

从 encoding / xml Marshall 功能文档：

From the encoding/xml Marshall function docs:

结构的XML元素包含每个结构的导出字段的编组元素

The XML element for a struct contains marshalled elements for each of the exported fields of the struct

请参阅无法解析golang中复杂的json 为相关答案。

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