文件读写。 [英] file to read and write.

问题描述

如何编写程序来读取大小为4096的文件，我必须为此提供块代码。之后通过检索这些块代码来编写文件？



我当前的代码是这个

How can I write a program to read a file of size 4096 and I have to give block code for that. After that to write the file by retrieving those block code?

My current code is this

using System;
using System.IO;
class FileRead
{
    string filereadbuf;  
    public void ReadFile(string FileName, int FileSize)
    {
        char[] buf = new char[FileSize];  
        
        StreamReader sr = new StreamReader(new FileStream(FileName, FileMode.Open, FileAccess.Read));
        int retval = sr.ReadBlock(buf, 0, FileSize); // 
        Console.Write("Total Bytes Read = " + retval + "\n");
        filereadbuf = new string(buf);  
        Console.WriteLine(filereadbuf); 
        sr.Close();
    }
}

class TestFileRead
{
    public static void Main(string[] args)
    {
        String[] cmdline = Environment.GetCommandLineArgs(); 
        Console.WriteLine("File Reader Using Stream Reader & File Stream \n");
        if (cmdline.Length < 2) 
        {
            Console.WriteLine("Usage: " + cmdline[0] + " <input file> ");
            return;
        }
      
      
        File[] fe = (new Directory(".")).GetFiles(cmdline[1]);
        if (fe.Length == 0)
        {
            Console.WriteLine(cmdline[1] + ": file not found"); 
            return;
        }
        FileRead fr = new FileRead();
        try
        {
            fr.ReadFile(cmdline[1], (int)fe[0].Length); 
        }
        catch (IOException e)
        {
            Console.WriteLine("I/O error occured" + e);
            return;
        }
    } 
}

推荐答案

你可以查看MSDN：基本文件I / O [ ^ ]。它提供了几种常见的场景以及如何通过C＃实现它们。



对于Block Code，你会发现大量的谷歌点击，例如 http://www.complextoreal.com/chapters/block.pdf [ ^ ]。



干杯

Andi

You may have a look at MSDN: Basic File I/O[^]. It provides several common scenarios and how to implement them by means of C#.

For Block Code, you find plenty of google hits, e.g. http://www.complextoreal.com/chapters/block.pdf[^].

Cheers
Andi

您的任务是实现 byte [] BlockDecode（byte [] encoded）函数。

起点可能是以下骨架。

由于到目前为止你还没有提供任何关于块代码的信息，我不能为它提供任何实现...... （参见下面的BlockDecode方法主体）。

Your task is to implement the byte[] BlockDecode(byte[] encoded) function.
A starting point might be the following skeleton.
Since you do not provide any information so far on the block code, I can not provide any implementation for it... (see BlockDecode method body below).

static void Main(string[] args)
{
   ...
   string inFilePath = ...;
   string outFilePath = ...;
   ...
   byte[] encoded = File.ReadAllBytes(inFilePath);
   byte[] decoded = BlockDecode(encoded);
   File.WriteAllBytes(outFilePath, decoded);
}
private static byte[] BlockDecode(byte[] encoded)
{
   byte[] decoded = new byte[encoded.Length];
   int decodedBytes = 0;
   // here you must provide the code for extracting the payload
   // from the encoded bytes counting up the number of decoded bytes
   ...
   Array.Resize(ref decoded, decodedBytes);
   return decoded;
}

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