英文:
Why go writes 000/s instead of string?
问题
由于某些原因，Go将字符串编码为字节，我想知道这是否是Go的一个错误。请参考下面的代码：
ip, _, err := net.ParseCIDR(cidr)if err != nil {log.Panicf("can't parse cidr %s, err was %v", cidr, err)}type Ip struct {Ip string}ips := string(ip)j := Ip{Ip: ips,}b, err := json.Marshal(j)if err != nil {log.Printf("error:", err)}fmt.Fprintln(w, string(b))
它输出：
{"Ip":"\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\ufffd\ufffd\ufffd\ufffd\u0007+"}
我正在从epel存储库（redhat）运行Go。我还创建了一个类似的代码片段，返回类似的结果。
[为我播放！][1]
[1]: http://play.golang.org/p/JbbbfK3whZ
英文:
For some reasons go encodes the string like bytes and I'm wondering if it's a go bug. See the code below:
ip, _, err := net.ParseCIDR(cidr)if err!=nil{log.Panicf("can't parse cidr %s, err was %v", cidr, err)}type Ip struct{Ip string}ips := string(ip)j:= Ip{Ip: ips,}b, err := json.Marshal(j)if err != nil {log.Printf("error:", err)}fmt.Fprintln(w, string(b))
It prints:
{"Ip":"\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\ufffd\ufffd\ufffd\ufffd\u0007+"}
I'm running Go from epel repository ( redhat ). I also made a snippet which returns similar results.
[Play it for me!][1]
[1]: http://play.golang.org/p/JbbbfK3whZ
答案1
得分: 3
这是因为你将一系列的IP地址字节视为原始字符串。
net.ParseCIDR 返回的 net.IP 值有一个 .String() 方法，你应该调用它，而不是使用 string(ip)。
尝试使用 这个 代码：
package mainimport ("encoding/json""fmt""log""net")func main() {cidr := "172.162.21.84/32"ip, _, err := net.ParseCIDR(cidr)if err != nil {log.Panicf("无法解析CIDR %s，错误：%v", cidr, err)}type Ip struct {Ip string}fmt.Printf("%T: %v\n", ip, ip)j := Ip{Ip: ip.String(),}b, err := json.Marshal(j)if err != nil {log.Printf("错误：", err)}fmt.Println(string(b))}
英文:
This happens because you are treating a sequence of IP address bytes as a raw string.
The net.IP value returned by net.ParseCIDR has a .String() method you should call, instead of doing string(ip).
Try this instead:
package mainimport ("encoding/json""fmt""log""net")func main() {cidr := "172.162.21.84/32"ip, _, err := net.ParseCIDR(cidr)if err != nil {log.Panicf("can't parse cidr %s, err was %v", cidr, err)}type Ip struct {Ip string}fmt.Printf("%T: %v\n", ip, ip)j := Ip{Ip: ip.String(),}b, err := json.Marshal(j)if err != nil {log.Printf("error:", err)}fmt.Println(string(b))}
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