Question

我正在尝试使用golang解析xml文件。我已经创建了我需要的结构但是当我尝试编译go文件时，我收到一条错误说明如下：

./ main_v4.go：146：aggInfoXml.IpAddr.Hports undefined（类型[] Addr没有字段或方法Hports）

我对这个问题很难过。这是我的代码：

package main

import(
    "net/http"
    "html/template"
    "os/exec"
    "io/ioutil"
    "os"
    "encoding/xml"
    "encoding/json"
    "fmt"
    "bufio"
    "github.com/gorilla/websocket"
    "time"
    "log"

)

type PercentInfo struct {
    Percent IntPercent `xml:"taskprogress,omitempty"`
} 

type AggInfoXml struct {
    Percent     IntPercent  `xml:"taskprogress,omitempty"`
    IpAddr      []Addr      `xml:"host>address,omitempty"`
}

type IntPercent struct {
    Value float64 `xml:"percent,attr,omitempty"` // works
}


type Addr struct {
    Ip      string   `xml:"addr,attr"`
    Hports  []Ports  `xml:"host>ports>port,omitempty"` //failing to be recognized
}

type Ports struct {
    Port string `xml:"portid,attr"`
}

func (p *Addr) ipaddr() string {
     return p.Ip
}

func (p *Ports) ports() string {
     return p.Port
}

func (p *IntPercent) percent() float64 {
    return p.Value
}

func (f *Test) Name() string {
    return f.Value

}

var upgrader = websocket.Upgrader{
    ReadBufferSize: 1024,
    WriteBufferSize: 1024,
}

type Test struct {
    Value string    
}


func wsHandler(w http.ResponseWriter, r *http.Request) {

    conn, err := upgrader.Upgrade(w, r, nil)
    if err != nil {
        fmt.Println(err)
    }

    cmd := exec.Command("nmap", "-F", "-sS", "172.16.2.0/24", "-oX", "output.xml", "--stats-every", "1s")

    if err := cmd.Start(); err != nil {
        log.Fatal(err)
    }

    time.Sleep( 1000 * time.Millisecond) 

    fp, err := os.Open("output.xml")
    if err != nil {
        log.Fatal(err)
    }


    // create scanner on the output.xml file
    in := bufio.NewScanner(fp)

    // change this loop to buffer read the xml file...
    aggInfoXml  := AggInfoXml{}

    fmt.Printf("hello")

    for in.Scan() {

        err = xml.Unmarshal([]byte(in.Text()), &aggInfoXml.Percent) 
        if err != nil {
            fmt.Printf("Could not unmarshal the line <%v>", in.Text())
        } else {
            fmt.Printf("%+v\n", aggInfoXml.Percent.Value)
        }

        // bail out of slow loop if 100% reached
        if aggInfoXml.Percent.Value == 100 {
            break
        }

        time.Sleep(1000*time.Millisecond)

        bytesArray, err := json.Marshal(aggInfoXml.Percent)

        err = conn.WriteMessage(websocket.TextMessage, bytesArray)  // send JSON over
        if err != nil {
            panic(err)
        }

    }//this is the end of the in.Scan loop now

    fmt.Println("After loop")

    if err := cmd.Wait(); err != nil {  
        log.Fatal(err)
    }

    data, err := ioutil.ReadFile("output.xml")

    if err != nil {
        panic(err)
    }

    err = xml.Unmarshal(data, &aggInfoXml.IpAddr)
    if err != nil {
        log.Fatal("Could not unmarshal host")
    }

    for _, port := range aggInfoXml.IpAddr.Hports {
        fmt.Printf("Port: %s\n", port.ports())
    }

    for _, ip := range aggInfoXml.IpAddr {
        fmt.Printf("IpAdd: %s\n", ip.ipaddr())
    }

    conn.Close()
    fp.Close()
}

func handler(w http.ResponseWriter, r *http.Request) {

    t, _ := template.ParseFiles("index.html")
    t.Execute(w,nil)
}

func main() {

    http.HandleFunc("/", handler)
    http.Handle("/layout/", http.StripPrefix("/layout/", http.FileServer(http.Dir("layout"))))
    http.HandleFunc("/websocket", wsHandler)
    http.ListenAndServe(":8080", nil) 
}

任何建议都会有所帮助。

Answer 1

type AggInfoXml struct {
    Percent     IntPercent  `xml:"taskprogress,omitempty"`
    IpAddr      []Addr      `xml:"host>address,omitempty"`
}




type Addr struct {
    Ip      string   `xml:"addr,attr"`
    Hports  []Ports  `xml:"host>ports>port,omitempty"` //failing to be recognized
}

IpAddr是一个数组。它没有名为Hports的属性。您将不得不像这样引用该数组的一个元素。

aggInfoXml.IpAddr[0].Hports

但是如果你想访问Hports的端口，那么你将不得不这样做。

aggInfoXml.IpAddr[0].Hports[0]

Answer 2

我从Prajwal那里得到了答案，因为它指出了问题，但实际上，在您的代码中，您似乎应该用这样的代码替换for循环：

for _, ip := range aggInfoXml.IpAddr {
    fmt.Printf("IpAdd: %s\n", ip.ipaddr())

    for _, port := range ip.Hports {
        fmt.Printf("Port: %s\n", port.ports())
    }
}

Golang：struct error

2 个答案: