dounai9294
2015-03-31 14:37
浏览 28
已采纳

是否可以在Go中将结构作为参数传递?

I'm trying to pass an array of key, values to another function in Go. Very new to Go so am struggling to figure it out.

package main

import(
    "net/http"
    "fmt"
    "io/ioutil"
    "net/url"
)

type Params struct {
    items []KeyValue
}

type KeyValue struct {
    key string
    value string
}

func main() {
     data := []Params{
          KeyValue{ key: "title", value: "Thingy" },
          KeyValue{ key: "body", value: "Testing 123" }}

     response, error := makePost("test-api.dev", &data)
}

func makePost(urlString string, values []Params) (string, error) {

     v := url.Values{}

    for _, val := range values {
        v.Add(val.key, val.value)
    }

    response, err := http.PostForm(urlString, v)

    defer response.Body.Close()

    contents, err :=  ioutil.ReadAll(response.Body)

    if err != nil {
        fmt.Printf("%s", err)
    }

    return string(contents), err
}

I get errors:

val.key undefined (type Params has no field or method key)
val.value undefined (type Params has no field or method key)

When I compile however.

Go playground link http://play.golang.org/p/CQw03wZmAV

Thanks in advance!

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3条回答 默认 最新

  • doutuan6158 2015-03-31 15:23
    已采纳

    As others have mentioned, you have an []Params but you are trying to initialize with KeyValues.

    data := []Params{
          KeyValue{ key: "title", value: "Thingy" },
          KeyValue{ key: "body", value: "Testing 123" }}
    

    Instead, try:

    data := &Params{items: []KeyValue{
        {key: "title", value: "Thingy"},
        {key: "body", value: "Testing 123"},
    }}
    
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  • dongyimo1293 2015-03-31 15:19

    values is a []Params. When you iterate over it, val will be a Params, but you're treating it as though it was a KeyValue. Did you actually mean to pass an []Params at all, instead of just a Params or even just a []KeyValue?

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  • duangao8359 2015-03-31 16:23

    Thanks folks, finally got it working with: http://play.golang.org/p/aCKU5bTnhT

    package main
    
    import (
        "fmt"
    )
    
    type Params struct {
        items []KeyValue
    }
    
    type KeyValue struct {
        key   string
        value string
    }
    
    func main() {
        data := Params{items: []KeyValue{
            {key: "title", value: "Thingy"},
            {key: "body", value: "Testing 123"},
        }}
    
        makePost("test-api.dev", data)
    }
    
    func makePost(urlString string, values Params) string {
    
        for _, val := range values.items {
            fmt.Println("%s", val.key+":"+val.value)
        }
    
        return string("test")
    }
    
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