Let's talk about how to convert byte to int in golang

Golang is a programming language that supports high concurrency and is lightweight. Because it is easy to learn, clear code, and rapid development, it is gradually loved by more and more developers. In Golang, different types of data need to be converted. The conversion of byte and int data types is very commonly used in processing binary data and network data packets. This article will introduce the conversion method of byte and int data types, which is mainly divided into the following two parts:

1. Implementation method of converting byte to int
2. Implementation method of converting int to byte

1. Implementation method of converting byte to int

In Golang, byte is a basic data type, which represents an 8-bit unsigned integer ranging from 0 to 255. While int represents a signed integer type, its range depends on the compiler and operating system. When converting byte to int, we need to note that since byte is an unsigned integer type, the int type obtained after conversion is also an unsigned integer type.

Method 1: Use the ParseUint function in the strconv library for conversion

In Golang, you can use the ParseUint function in the strconv library to convert the byte type to the uint64 type, and then convert the uint64 type is of int type, as shown below:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    b := byte(100)
    i := int(strconv.ParseUint(fmt.Sprintf("%d", b), 10, 64))
    fmt.Printf("%d\n", i)
}

In the above code, we first define a variable b to represent byte type data, then use the fmt.Sprintf function to convert it to a string type, and use strconv The .ParseUint function converts it to uint64 type. Finally, use the int function to convert the uint64 type to the int type to get the desired result.

Method 2: Use the BigEndian.Uint16 function in the binary library for conversion

In Golang, you can use the BigEndian.Uint16 function in the binary library to convert byte type data to uint16 type Big endian integer, and then use the int function to convert it to the int type, as shown below:

package main

import (
    "encoding/binary"
    "fmt"
)

func main() {
    b := byte(100)
    i := int(binary.BigEndian.Uint16([]byte{0, b}))
    fmt.Printf("%d\n", i)
}

In the above code, we use the binary.BigEndian.Uint16 function to convert the byte type data to A big-endian integer of type uint16, the returned data type is uint16. Then we convert it to int type and we get the desired result.

2. Implementation method of converting int to byte

In Golang, when converting int type to byte type, it should be noted that if the int type data exceeds the range of byte type, then Data will be truncated and unexpected errors may occur. Therefore, you should first determine whether the int type data is within the range of byte before performing conversion.

Method 1: Use []byte slices to achieve

You can use []byte slices to convert int type to byte type, as shown below:

package main

import "fmt"

func main() {
    i := 100
    if i < 0 || i > 255 {
        fmt.Printf("Error: %d is out of range.\n", i)
    } else {
        b := []byte{byte(i)}
        fmt.Printf("%v\n", b)
    }
}

In the above In the code, we first determine whether the int type data is within the range of the byte type. If it is within the range, initialize the int type data with []byte to obtain the required results.

Method 2: Use unsafe.Pointer to achieve

In Golang, you can also use unsafe.Pointer to convert int type to byte type, as shown below:

package main

import (
    "fmt"
    "unsafe"
)

func main() {
    i := 100
    if i < 0 || i > 255 {
        fmt.Printf("Error: %d is out of range.\n", i)
    } else {
        b := *(*byte)(unsafe.Pointer(&i))
        fmt.Printf("%d\n", b)
    }
}

In the above code, we first determine whether the int type data is within the range of the byte type. If it is within the range, use (byte)(unsafe.Pointer(&i)) to convert i to byte type to get the desired result.

Conclusion

Through the introduction of this article, we have learned about the conversion implementation method of byte and int data types in Golang. In daily programming work, whether it is processing binary data or network data packets, this knowledge point is very useful. We hope this article can bring you some help and allow you to better use Golang for development.

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