英文:
Having trouble unmarshaling this xml
问题
尝试理解如何在Go中解析XML。阅读了多个示例和stackoverflow问题。我想要的是一个包含系统上安装的所有补丁的切片。我甚至无法将补丁解析出来，没有错误，只是一个空的切片。可能是做了一些基本错误的事情，提前感谢任何建议。
<probe version="1.3" date="2012-03-26:17:10">
<properties>
</properties>
<patches group="server">
<file name="5002012-02-09CR00000server.jar"/>
<file name="5002012-02-17CR00001server.jar"/>
</patches>
<patches group="client">
<file name="5002012-02-09CR00000client.jar"/>
<file name="5002012-02-17CR00001client.jar"/>
</patches>
</probe>
type Patch struct {
group string `xml:"group,attr"`
}
type Probe struct {
XMLName xml.Name `xml:"probe"`
Patches []Patch `xml:"patches"`
}
英文:
Trying to understand how to unmarshall XML in Go. Read through multiple examples and stackoverflow questions. What I want is a slice with the all the patches installed on the system. I can't even get the patches to unmarshal, no errors, just an empty slice. Probably doing something basically wrong, thanks in advance for any suggestions.
<probe version="1.3" date="2012-03-26:17:10">
<properties>
</properties>
<patches group="server">
<file name="5002012-02-09CR00000server.jar"/>
<file name="5002012-02-17CR00001server.jar"/>
</patches>
<patches group="client">
<file name="5002012-02-09CR00000client.jar"/>
<file name="5002012-02-17CR00001client.jar"/>
</patches>
</probe>
<!-- language: lang-go -->
type Patch struct {
group string `xml:"group,attr"`
}
type Probe struct {
XMLName xml.Name `xml"probe"`
Patches []Patch `xml:"patches"`
}
答案1
得分: 6
我相信你遇到的问题是xml包没有填充未导出的字段。xml文档中说：
>因为Unmarshal使用了reflect包，它只能赋值给导出的（大写字母开头）字段。
你只需要将group改为Group：
type Patch struct { Group string `xml:"group,attr"` }
你可以在这里找到一个可工作的示例：
http://play.golang.org/p/koSzZr-Bdn
英文:
The problem I believe you have is the xml package not populating unexported fields. The xml documentation says:
>Because Unmarshal uses the reflect package, it can only assign to exported (upper case) fields.
All you need to do is to change group to Group:
type Patch struct { Group string `xml:"group,attr"` }
You have a working example here:
http://play.golang.org/p/koSzZr-Bdn
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