How to Convert Structs to Byte Arrays and Vice Versa in Go?

Go Conversion Between Struct and Byte Array

Q: How can I perform C-like type casting between structs and byte arrays in Go? For example, how can I map a received network byte stream directly to a struct?

A: The encoding/binary package provides a more convenient and safer alternative to unsafe.Pointer:

<code class="go">// Create a struct and write it.
type T struct {
  A uint32
  B float64
}

t := T{A: 0xEEFFEEFF, B: 3.14}
buf := &bytes.Buffer{}
err := binary.Write(buf, binary.BigEndian, t)

if err != nil {
  panic(err)
}

fmt.Println(buf.Bytes())

// Read into an empty struct.
t = T{}
err = binary.Read(buf, binary.BigEndian, &t)

if err != nil {
  panic(err)
}

fmt.Printf("%x %f", t.A, t.B)</code>

By utilizing the binary package, you can easily convert between structs and byte arrays in a safer and more concise manner, handling sizes and endianness automatically.

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