从二进制文件读取错误 [英] Reading from a binary file error

问题描述

试图从二进制文件中读取简单的记录结构，但得到以下错误消息.有什么问题吗?

Trying to read simple record structure from Binary file, but get the following error message. What is the problem?

类型为'System.IO.EndOfStreamException'的未处理异常 发生在mscorlib.dll

An unhandled exception of type 'System.IO.EndOfStreamException' occurred in mscorlib.dll

其他信息:无法读到流的末尾.

Additional information: Unable to read beyond the end of the stream.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace Reading_from_Binary_File
{
    class Program
    {
        struct TBook
        {
            public string author;
            public string title;
            public string genre; //TGenreTypes genre;
            public int bookid;
        };

        static void Main(string[] args)
        {
            FileStream currentFile;
            BinaryReader readerFromFile;
            currentFile = new FileStream("Test.bin", FileMode.Open);
            readerFromFile = new BinaryReader(currentFile);

            TBook myBooks;
            do
            {
                //Now read from file and write to console window
                 myBooks.title = readerFromFile.ReadString();
                 myBooks.author = readerFromFile.ReadString();
                 myBooks.genre = readerFromFile.ReadString();
                // myBooks.genre = (TGenreTypes)Enum.Parse(typeof(TGenreTypes),readerFromFile.ReadString());
                myBooks.bookid = readerFromFile.ReadInt16();
                Console.WriteLine("Title: {0}", myBooks.title);
                Console.WriteLine("Author: {0}", myBooks.author);
                Console.WriteLine("Genre: {0}", myBooks.genre);
                Console.WriteLine("BookID: {0}", myBooks.bookid);
            }
            while (currentFile.Position < currentFile.Length);

            //close the streams
            currentFile.Close();
            readerFromFile.Close();

            Console.ReadLine();
        }
    }
}

更新: 我也尝试过

while (currentFile.Position < currentFile.Length);
{
    ...
}

但是我遇到了同样的错误.

but I get the same error.

推荐答案

尝试交换

myBooks.bookid = readerFromFile.ReadInt16();

使用

myBooks.bookid = readerFromFile.ReadInt32();

默认情况下，int是System.Int32的别名.

as by default the int is an alias for System.Int32.

在您的结构中

struct TBook
{
    public string author;
    public string title;
    public string genre; //TGenreTypes genre;
    public int bookid;
};

您已指定int bookid，然后将其为System.Int32. 因此，仅读取2 bytes而不是4 bytes将导致流中剩下2 bytes.因此循环不会中断.然后，在循环中，您将尝试读取不存在的另一组数据"(仅2个字节).

you have specified int bookid which would then be a System.Int32. So reading just 2 bytes instead of 4 bytes will result in having 2 bytes left in the stream. So the loop won't break. In the loop you will then try to read another "set" of data which isn't there (just the 2 bytes).

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