在go中使用来自网络的原始字节 （抱歉，问题长）我最近一直在尝试C++游戏服务器仿真器，我正在做一个项目，我在问我是否用明智的GO术语来实现它。正如您所料，服务器通过发送遵循特定协议规范的原始数据包（TCP）与一个或多个游戏客户端进行通信。相关部分如下所示：

接收头->解密它->接收字节，直到达到头长度->解密数据包的其余部分->分派给处理程序->解码数据包->根据需要处理->发送响应

协议是以字节序定义的，所以在C++实现中，包头看起来像这样（我知道，它只在LE机器上工作）：

在recv（）对该头进行加密和解密后，我将提取字段：

// client->recv_buffer is of type u_char[1024]
header = (pkt_header*) client->recv_buffer;

if (client->recv_size < header->length) {
    // Recv some more
}
// Decrypt and so on

作为一个新手，我非常欢迎关于如何更有效地实现这一点的反馈。到目前为止，它工作得很好，但现在我面临的挑战是如何做相反的事情：从[]字节->结构（例如，[C8 00 03 00 01 00 00]到头{length=C8，size=03，flags=0100}

---

我是否需要实现与此相反的方法，或者是否有更好的方法从字节数组转换为任意结构（或者相反，与我的函数相反）？请告诉我是否有任何额外的清晰性会有所帮助。

最好的方法是使用它，它在内部实现了您上面所写的内容

（）

哪张照片

in = &main.Header{Length:0xc8, Size:0x3, Flags:0x100}
wire = c8 00 03 00 00 01 00 00
out = main.Header{Length:0xc8, Size:0x3, Flags:0x100}

---

太好了，谢谢！我应该在去写我自己的函数之前问一下。至少它很有趣。。。

// Serializes the fields of a struct to an array of bytes in the order in which the fields are
// declared. Calls panic() if data is not a struct or pointer to struct.
func StructToBytes(data interface{}) []byte {
    val := reflect.ValueOf(data)
    valKind := val.Kind()
    if valKind == reflect.Ptr {
        val = reflect.ValueOf(data).Elem()
        valKind = val.Kind()
    }

    if valKind != reflect.Struct {
        panic("data must of type struct or struct ptr, got: " + valKind.String())
    }

    bytes := new(bytes.Buffer)
    for i := 0; i < val.NumField(); i++ {
        field := val.Field(i)

        switch kind := field.Kind(); kind {
        case reflect.Struct:
            binary.Write(bytes, binary.LittleEndian, StructToBytes(field.Interface()))
        case reflect.Array, reflect.Slice:
            binary.Write(bytes, binary.LittleEndian, field.Interface())
        case reflect.Uint8:
            binary.Write(bytes, binary.LittleEndian, uint8(field.Uint()))
        case reflect.Uint16:
            binary.Write(bytes, binary.LittleEndian, uint16(field.Uint()))
        // You get the idea
        }
    }
    return bytes.Bytes()
}

type Header struct {
    length uint16
    size uint16
    flags uint32
}
newHeader := new(Header)
// Initialization, etc
client.Conn.Write(StructToBytes(newHeader)) // ex. [C8 00 03 00 00 00 01 00]  

package main

import (
    "bytes"
    "encoding/binary"
    "fmt"
    "log"
)

type Header struct {
    Length uint16
    Size   uint16
    Flags  uint32
}

func main() {
    header := &Header{Length: 0xC8, Size: 3, Flags: 0x100}
    fmt.Printf("in = %#v\n", header)
    buf := new(bytes.Buffer)

    err := binary.Write(buf, binary.LittleEndian, header)
    if err != nil {
        log.Fatalf("binary.Write failed: %v", err)
    }
    b := buf.Bytes()
    fmt.Printf("wire = % x\n", b)

    var header2 Header
    buf2 := bytes.NewReader(b)
    err = binary.Read(buf2, binary.LittleEndian, &header2)
    if err != nil {
        log.Fatalf("binary.Read failed: %v", err)
    }
    fmt.Printf("out = %#v\n", header2)
}

in = &main.Header{Length:0xc8, Size:0x3, Flags:0x100}
wire = c8 00 03 00 00 01 00 00
out = main.Header{Length:0xc8, Size:0x3, Flags:0x100}