How to encode and receive struct?

[kuredoro]

I have the following code in the sender app:

type Data struct {
	a string `y3:"0x11"`
	b string `y3:"0x12"`
	c string `y3:"0x13"`
	d string `y3:"0x14"`
	e string `y3:"0x15"`
}

codec := y3.NewCodec(0x10)

func generateAndSendData(stream quic.Stream) {
	test := Data{
		a: "a",
		b: "bc",
		c: "def",
		d: "ghi",
		e: "jklmn",
	}
	for i := 0; i < 10; i++ {
		time.Sleep(100 * time.Millisecond)

		sendingBuf, _ := codec.Marshal(test)

		_, err := stream.Write(sendingBuf)
		if err != nil {
			log.Printf("Couldn't send buffer with i=%v", i)
		} else {
			fmt.Print(".")
		}
	}
}

And the following receiving-side code:

package main

import (
	"context"
	"fmt"

	y3 "github.com/yomorun/y3-codec-golang"
	"github.com/yomorun/yomo/pkg/rx"
)

type Data struct {
    a string `y3:"0x11"`
    b string `y3:"0x12"`
    c string `y3:"0x13"`
    d string `y3:"0x14"`
    e string `y3:"0x15"`
}

var convert = func(v []byte) (interface{}, error) {
    fmt.Printf("Received: %v\n", v)
    var mold Data
    err := y3.ToObject(v, &mold)
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        return nil, err
    }
    return mold, err
}

func Handler(rxstream rx.RxStream) rx.RxStream {
    return rxstream.
        Subscribe(0x10).
        OnObserve(convert).
        StdOut().
	Encode(0x11)
}

It prints this and fails:

Received: [144 35 17 5 97 98 99 100 101 18 7 121 111 117 32 97 114 101 19 5 110 105 99 101 114 20 4 116 104 97 110 21 4 101 118 101 114]
Error: fieldValue can not set:

I tried int64 instead of string, but it returns

Error: fieldValue can not set:0

What am I doing wrong? :(

[chenjunbiao]

Please set member variables to start with an uppercase letter, like this:

type Data struct {
	A string `y3:"0x11"`
	B string `y3:"0x12"`
	C string `y3:"0x13"`
	D string `y3:"0x14"`
	E string `y3:"0x15"`
}

then you can receive the data:

Received: [144 24 17 1 97 18 2 98 99 19 3 100 101 102 20 3 103 104 105 21 5 106 107 108 109 110]
[StdOut]:  {a bc def ghi jklmn}
Received: [144 24 17 1 97 18 2 98 99 19 3 100 101 102 20 3 103 104 105 21 5 106 107 108 109 110]
[StdOut]:  {a bc def ghi jklmn}

[kuredoro]

Right! Thank you very much! Not programming in Go for a long time really gets noticed....