2016-03-09 23:14
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Golang Websocket检测文件消息并在超过1 ws帧字节的情况下将其写入

I need to save each new picture in one file, which is sent by several frames through websockets. Here is code of my file:

package main

import (

var (
dirPath string
test    byte
lenFile int

func check(e error) {
if e != nil {

func ChatServer(ws *websocket.Conn) {   
defer ws.Close()
var test []byte
var payload []byte
for {
    err := websocket.Message.Receive(ws, &payload)
    if err != nil {

    fmt.Println("Payload: ", len(payload))

    test = append(test, payload...)
    fmt.Println("Test: ", len(test))

    fo, err := os.Create(fmt.Sprintf("./%d.png", time.Now().UnixNano()))
    _, err = fo.Write(test)


func main() {
if len(os.Args) < 2 {
    log.Fatal("Usage: chatExample <dir>")

dirPath = os.Args[1]

fmt.Println("Starting... ")

http.Handle("/", http.FileServer(http.Dir(dirPath)))
http.Handle("/ws", websocket.Handler(ChatServer))

err := http.ListenAndServe(":3000", nil)

if err != nil {
    log.Fatal("ListenAndServe ", err)

And here is my results of downloading two files in order:

Console logging of bytes every ws frame Two images that I sent Result in filesystem catalog So I need save only two files (images) if I send two files, not three. Also I need to save two different files, I have to somehow detect new file from websocket connect.

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1条回答 默认 最新

  • duansao20000508 2016-03-10 00:17

    The sender fragments one of the messages into two frames. Because the x/net/websocket API exposes frames instead of messages, the application writes three files.

    It's not possible to detect message boundaries using the x/net/websocket package. Use the gorilla/websocket package instead.

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