On Thursday, June 4, 2020 at 9:06:50 PM UTC+3, Lars R. Damerow wrote:
>
> Hello all,
>
> I need to parse XML messages from a source I don't control. Each one has
> an envelope node that shows its source, and the first node in that envelope
> encodes the message type. I'm trying to compose structs to make it easier
> to do the parsing, and I put a stripped-down example for just one message
> type on the playground here:
>
> https://play.golang.org/p/tszPHRM-mMO
>
> What's puzzling me here is that, after unmarshaling,
> `v.Envelope.XMLName.Local` is empty. I'd expect it to contain "proto-alpha"
> from the example XML in the source; it does pick up the version attribute
> that's set on the envelope node, just not the `xml.Name` value.
>
> Can anyone share some clues about what I'm doing wrong here?
>
You have a extra layer there in the structs, try this
type Envelope struct {
XMLName xml.Name
Version string `xml:"version,attr"`
Body GreetingBody
}
type GreetingBody struct {
XMLName xml.Name `xml:"greeting"`
Str string `xml:"str"`
}
func main() {
var input = `<?xml version ="1.0" encoding="UTF-8"?>
<proto-alpha version="1.3">
<greeting>
<str>hello</str>
</greeting>
</proto-alpha>
`
v := Envelope{}
if err := xml.Unmarshal([]byte(input), &v); err != nil {
log.Panic(err)
}
fmt.Printf("%+v\n", v)
}
HTH
ain
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