24.总结

6.文件操作相关-综合练习题

---

6.1 知识点

为图中的Student类实现保存和读取2进制文件的方法

创建Student类,添加对应的变量

public class Student
{
    public int age;
    public string name;
    public int number;
    public bool sex;
}

Student类中创建保存方法。传入文件名参数。判断可读可写路径下是否存在Student文件夹，不存在则创建。新建流进行写入对应变量。

public void Save(string fileName)
{
    Debug.Log(Application.persistentDataPath); // 打印存储的路径

    // 如果不存在指定路径，则创建一个文件夹
    if (!Directory.Exists(Application.persistentDataPath + "/Student"))
    {
        Directory.CreateDirectory(Application.persistentDataPath + "/Student");
    }

    // 新建一个指定名字的文件，并返回文件流进行字节的存储
    using (FileStream fileStream = new FileStream(Application.persistentDataPath + "/Student/" + fileName + ".linwentao", FileMode.OpenOrCreate, FileAccess.Write))
    {
        // 写入 age
        byte[] bytes = BitConverter.GetBytes(age);
        fileStream.Write(bytes, 0, bytes.Length);

        // 写入 name
        bytes = Encoding.UTF8.GetBytes(name);
        // 存储字符串字节数组的长度
        fileStream.Write(BitConverter.GetBytes(bytes.Length), 0, 4);
        // 存储字符串字节数组
        fileStream.Write(bytes, 0, bytes.Length);

        // 写入 number
        bytes = BitConverter.GetBytes(number);
        fileStream.Write(bytes, 0, bytes.Length);

        // 写入 sex
        bytes = BitConverter.GetBytes(sex);
        fileStream.Write(bytes, 0, bytes.Length);

        // 刷新缓冲区，确保所有数据已写入文件
        fileStream.Flush();
        // 关闭文件流
        fileStream.Close();
    }
}

Student类中创建读取方法。传入文件名参数。判断文件是否存在，不存在返回空。申明Student对象，读取文件中全部直接数组，挨个读取其中的内容，用一个索引记录。

public static Student Load(string fileName)
{
    //判断文件是否存在
    if (!File.Exists(Application.persistentDataPath + "/Student/" + fileName + ".linwentao"))
    {
        Debug.LogWarning("没有找到对应的文件");
        return null;
    }

    //申明对象
    Student student = new Student();

    //加载2进制文件 进行赋值
    using (FileStream fileStream = File.Open(Application.persistentDataPath + "/Student/" + fileName + ".linwentao", FileMode.Open, FileAccess.Read))
    {
        //把我们文件中的字节 全部读取出来
        byte[] bytes = new byte[fileStream.Length];
        fileStream.Read(bytes, 0, bytes.Length);
        fileStream.Close();

        //读取索引
        int index = 0;

        //挨个读取其中的内容

        //读取age
        student.age = BitConverter.ToInt32(bytes, index);
        index += 4;

        //读取字符串字节数组的长度
        int length = BitConverter.ToInt32(bytes, index);
        index += 4;

        //读取name
        student.name = Encoding.UTF8.GetString(bytes, index, length);
        index += length;

        //读取number
        student.number = BitConverter.ToInt32(bytes, index);
        index += 4;

        //读取sex
        student.sex = BitConverter.ToBoolean(bytes, index);
        index += 1;
    }

    return student;
}

对读取存储方法进行测试

void Start()
{
    Student student1 = new Student();
    student1.age = 18;
    student1.name = "林文韬";
    student1.number = 1;
    student1.sex = false;

    student1.Save("林文韬");


    Student student2 = Student.Load("林文韬");
}

---

6.2 知识点代码

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Lesson06_文件操作相关_综合练习题 : MonoBehaviour
{
    //为图中的Student类实现保存和读取2进制文件的方法

    void Start()
    {
        Student student1 = new Student();
        student1.age = 18;
        student1.name = "林文韬";
        student1.number = 1;
        student1.sex = false;

        student1.Save("林文韬");


        Student student2 = Student.Load("林文韬");
    }
}

public class Student
{
    public int age;
    public string name;
    public int number;
    public bool sex;

    public void Save(string fileName)
    {
        Debug.Log(Application.persistentDataPath); // 打印存储的路径

        // 如果不存在指定路径，则创建一个文件夹
        if (!Directory.Exists(Application.persistentDataPath + "/Student"))
        {
            Directory.CreateDirectory(Application.persistentDataPath + "/Student");
        }

        // 新建一个指定名字的文件，并返回文件流进行字节的存储
        using (FileStream fileStream =
               new FileStream(Application.persistentDataPath + "/Student/" + fileName + ".linwentao",
                   FileMode.OpenOrCreate, FileAccess.Write))
        {
            // 写入 age
            byte[] bytes = BitConverter.GetBytes(age);
            fileStream.Write(bytes, 0, bytes.Length);

            // 写入 name
            bytes = Encoding.UTF8.GetBytes(name);
            // 存储字符串字节数组的长度
            fileStream.Write(BitConverter.GetBytes(bytes.Length), 0, 4);
            // 存储字符串字节数组
            fileStream.Write(bytes, 0, bytes.Length);

            // 写入 number
            bytes = BitConverter.GetBytes(number);
            fileStream.Write(bytes, 0, bytes.Length);

            // 写入 sex
            bytes = BitConverter.GetBytes(sex);
            fileStream.Write(bytes, 0, bytes.Length);

            // 刷新缓冲区，确保所有数据已写入文件
            fileStream.Flush();
            // 关闭文件流
            fileStream.Close();
        }
    }


    public static Student Load(string fileName)
    {
        //判断文件是否存在
        if (!File.Exists(Application.persistentDataPath + "/Student/" + fileName + ".linwentao"))
        {
            Debug.LogWarning("没有找到对应的文件");
            return null;
        }

        //申明对象
        Student student = new Student();

        //加载2进制文件 进行赋值
        using (FileStream fileStream = File.Open(Application.persistentDataPath + "/Student/" + fileName + ".linwentao",
                   FileMode.Open, FileAccess.Read))
        {
            //把我们文件中的字节 全部读取出来
            byte[] bytes = new byte[fileStream.Length];
            fileStream.Read(bytes, 0, bytes.Length);
            fileStream.Close();

            //读取索引
            int index = 0;

            //挨个读取其中的内容

            //读取age
            student.age = BitConverter.ToInt32(bytes, index);
            index += 4;

            //读取字符串字节数组的长度
            int length = BitConverter.ToInt32(bytes, index);
            index += 4;

            //读取name
            student.name = Encoding.UTF8.GetString(bytes, index, length);
            index += length;

            //读取number
            student.number = BitConverter.ToInt32(bytes, index);
            index += 4;

            //读取sex
            student.sex = BitConverter.ToBoolean(bytes, index);
            index += 1;
        }

        return student;
    }
}

---

---

转载请注明来源，欢迎对文章中的引用来源进行考证，欢迎指出任何有错误或不够清晰的表达。可以在下面评论区评论，也可以邮件至 785293209@qq.com