Learn the encoding/binary.Write function in the Go language documentation to write binary data

Learn the encoding/binary.Write function in the Go language document to implement binary data writing

Go language is a statically typed compiled language, which has good performance and concise syntax. In the Go language, you can use the Write function in the encoding/binary package to write binary data. This article will introduce the use of this function in detail and provide specific code examples.

Before using the encoding/binary.Write function, you need to understand some basic knowledge. Within the computer, all data is stored and transmitted in binary form. In programming, we usually use abstract data types such as integers and floating point types to process these binary data. In the Go language, encoding and decoding binary data operations can be implemented through the encoding/binary package.

The encoding/binary.Write function is defined as follows:

func Write(w io.Writer, order ByteOrder, data interface{}) error

Among them, w is the io.Writer interface for writing binary data; order specifies the byte order of written data, which can be binary.BigEndian or binary.LittleEndian; data is the data to be written, which can be multiple data types, such as integers, floating point types, custom types, etc.

Next, we will demonstrate the use of the encoding/binary.Write function through actual code examples.

First, we create a structure containing multiple data types:

type Person struct {
    ID     int
    Name   string
    Height float64
}

Then, we define a function whose function is to write the data of the Person structure in binary form To the specified file:

func WritePersonToFile(filename string) error {
    // 创建一个Person结构体实例
    person := Person{
        ID:     1,
        Name:   "Tom",
        Height: 1.8,
    }

    // 创建文件
    file, err := os.Create(filename)
    if err != nil {
        return err
    }
    defer file.Close()

    // 将Person结构体实例以二进制形式写入文件
    err = binary.Write(file, binary.LittleEndian, person)
    if err != nil {
        return err
    }

    return nil
}

In the above code, we first create a Person structure instance and specify the values ​​of its various fields. Then, create the file and open it, and finally use the binary.Write function to write the Person structure to the file in binary form. It should be noted that when calling the binary.Write function, we also need to specify the byte order as binary.LittleEndian, that is, the low-order byte first.

Next, we call the WritePersonToFile function to test the written code:

func main() {
    filename := "person.bin"
    err := WritePersonToFile(filename)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    fmt.Println("Write to", filename, "successfully")
}

In the above code, we first specify the name of the generated binary file as "person.bin", and then call WritePersonToFile The function writes the data of the Person structure to the file in binary form.

When we execute the above code, if no errors occur, "Write to person.bin successfully" will be output on the console, indicating that the write operation is executed successfully.

Through the above code examples, we can see that binary data can be easily written to a file using the encoding/binary.Write function. This is very useful for network communication, data storage and other scenarios. At the same time, we can also extend and customize the use of this function to meet different needs.

Summary:
This article introduces how to use the encoding/binary.Write function in the Go language document. Through this function, we can easily write various data types into files in binary form, which provides convenience for data storage and transmission. I hope the introduction in this article will be helpful to you in learning and using the encoding/binary.Write function of Go language.

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