How to Convert []byte to int in Go for TCP Communication?

Converting from []byte to int in Go for TCP Communication

Communication over TCP often requires exchanging data in the form of byte arrays ([]byte). However, in certain scenarios, you may need to convert these byte arrays to integers (int) for processing.

Conversion Methods

To convert a byte array to an integer in Go, you can use two primary methods:

1. Using encoding/binary:

The encoding/binary package provides functions that allow you to convert from various binary formats to Go types. Specifically, for converting byte arrays to integers, you can use:

binary.LittleEndian.Uint32(mySlice) // Converts to 32-bit unsigned int
binary.BigEndian.Uint32(mySlice) // Converts to 32-bit unsigned int in big endian format

2. Custom Conversion:

You can also implement your conversion logic if the standard library functions don't meet your specific requirements. Here's an example of a custom conversion for converting a 4-byte array to an integer:

func bytesToInt(mySlice []byte) int {
    return int(mySlice[0]<<24 | mySlice[1]<<16 | mySlice[2]<<8 | mySlice[3])
}

Example Application:

In your client-server example, you can use the following code to send integers to the server:

package main

import (
    "encoding/binary"
    "net"
)

func main() {
    // 2 numbers to send
    num1 := 100
    num2 := 200

    // Convert to byte arrays
    buf1 := make([]byte, 4)
    binary.LittleEndian.PutUint32(buf1, uint32(num1))
    buf2 := make([]byte, 4)
    binary.LittleEndian.PutUint32(buf2, uint32(num2))

    // Connect to server
    conn, err := net.Dial("tcp", "127.0.0.1:8080")
    if err != nil {
        // Handle error
    }

    // Send byte arrays to server
    if _, err := conn.Write(buf1); err != nil {
        // Handle error
    }
    if _, err := conn.Write(buf2); err != nil {
        // Handle error
    }
}

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