Golang:[]byte to string

Hello everyone , I meet you again , I'm your friend, Quan Jun .

golang in , Character slices []byte convert to string The easiest way to do it is

package main
 
import (
    "fmt"
    _ "unsafe"
)
 
func main() { 
   
    bytes := []byte("I am byte array !")
    str := string(bytes)
    bytes[0] = 'i'// Pay attention to this line ,bytes The data is modified here , however str The printed ones are still unchanged ,
    fmt.Println(str)
}

Copy

Print information :I am byte array !

The above code bytes The data is modified here , however str The printed ones are still unchanged , Because []byte Memory of has been copied . Now let's look at the following code

package main
 
import (
    "fmt"
    "unsafe"
)
 
func main() { 
   
    bytes := []byte("I am byte array !")
    str := (*string)(unsafe.Pointer(&bytes))
    bytes[0] = 'i'
    fmt.Println(*str)
}

Copy

Print information :i am byte array !

Now the printed information has changed , Now you can see str and bytes Share a piece of memory .

The point of this is , In network communication , Most acceptance methods are []byte, If []byte The data is relatively large , Memory copy will affect the performance of the system .

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