通过go-socked.io接收字节数组时出现错误。

huangapple
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英文:

Error in Receiving byte array via go-socked.io

问题

我正在尝试将一个 Int8Array 从浏览器发送到 go-socked.io，这是我的客户端代码：

  1. function init(){
  2.     conn = io('http://localhost:8080/');
  3.     var c = new Int8Array([127]);
  4.     conn.emit('m', c);
  5. }

这是我的服务器代码：

  1. func main() {
  2.     server, err := socketio.NewServer(nil)
  3.     if err != nil {
  4.         log.Fatal(err)
  5.     }
  6.     server.On("connection", on_connection)
  7.     http.Handle("/socket.io/", server)
  8.     http.Handle("/src/", maxAgeHandler(0, http.FileServer(http.Dir("./"))))
  9.     http.Handle("/app/", maxAgeHandler(0, http.FileServer(http.Dir("./"))))
  10.     http.ListenAndServe(":8080", nil)
  11. }
  13. func on_connection(so socketio.Socket) {
  14.     log.Println("On connection")
  15.     so.Join("Room")
  16.     so.On("m", func(msg *socketio.Attachment) {
  17.         b, _ := ioutil.ReadAll(msg.Data)    // <---- I got error in this line
  18.         fmt.Println(b)
  19.     })
  20. }

我得到的错误信息是：

  1. panic: runtime error: invalid memory address or nil pointer dereference [recovered]
  2.     panic: runtime error: invalid memory address or nil pointer dereference

我想知道如何读取消息中的字节数据。

英文:

I am trying to send an Int8Array from browser to go-socked.io, here is my client's code:

  1. function init(){
  2.     conn = io('http://localhost:8080/');
  3.     var c = new Int8Array([127]);
  4.     conn.emit('m',c)
  5. }

This is my server code

  1. func main() {
  2. 	server, err := socketio.NewServer(nil)
  3. 	if err!= nil{
  4. 		log.Fatal(err)
  5. 	}
  6. 	server.On("connection",on_connection)
  7. 	http.Handle("/socket.io/", server)
  8. 	http.Handle("/src/", maxAgeHandler(0,http.FileServer(http.Dir("./"))))
  9. 	http.Handle("/app/", maxAgeHandler(0,http.FileServer(http.Dir("./"))))
  10. 	http.ListenAndServe(":8080",nil)
  11. }
  13. func on_connection(so socketio.Socket){
  14. 	log.Println("On connection")
  15. 	so.Join("Room")
  16. 	so.On("m",func(msg *socketio.Attachment){
  17. 		b, _ := ioutil.ReadAll(msg.Data)    <---- I got error in this line
  18. 		fmt.Println(b)
  19. 	})
  21. }

The error I got said:

  1. panic: runtime error: invalid memory address or nil pointer dereference [recovered]
  2.     panic: runtime error: invalid memory address or nil pointer dereference

I would like to know how to read the byte data in the message.

答案1

得分: 0

你没有发送附件，只是发送了数据。这些数据可以使用map[string]int8进行映射，因为你发送的是int8数组，而在socketio中，它被翻译为一个map。

  1. func on_connection(so socketio.Socket) {
  2.     log.Println("On connection")
  3.     so.Join("Room")
  4.     so.On("m", func(data map[string]int8) {
  5.         array := make([]int8, len(data))
  6.         for k, v := range data {
  7.             pos, _ := strconv.Atoi(k)
  8.             array[pos] = v
  9.         }
  10.         fmt.Println(array)
  11.     })
  12. }
英文:

You aren't sending an attachment, just data. This data can be used mapped with map[string]int8 because you're sending an array of int8 and this is translated as a map in socketio.

<!-- language: go -->

  1. func on_connection(so socketio.Socket) {
  2. 	log.Println(&quot;On connection&quot;)
  3. 	so.Join(&quot;Room&quot;)
  4. 	so.On(&quot;m&quot;, func(data map[string]int8) {
  5. 		array := make([]int8, len(data))
  6. 		for k, v := range data {
  7. 			pos, _ := strconv.Atoi(k)
  8. 			array[pos] = v
  9. 		}
  10. 		fmt.Println(array)
  11. 	})
  12. }

huangapple
  • 本文由 发表于 2016年12月25日 17:26:44
  • 转载请务必保留本文链接：https://go.coder-hub.com/41319992.html
  • go
  • socket.io
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