Value cannot be null. Parameter name: bytes

Question

1.00/5 (1 vote)

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I wanted to convert a binary file to a byte array and save the output to a text file

My code appears below:

C#

using System;
using System.IO;

namespace WindowsFormsApp9
{
	
	internal static partial class Program
	{
		
		[STAThread]
		private static void Main()
		{
			FileStream stream = File.OpenRead("C:\\\\Users\\\\Sniper\\\\Desktop\\\\array3.bin");
			byte[] fileBytes = new byte[stream.Length];
			stream.Read(fileBytes, 0, fileBytes.Length);
			stream.Close();
			File.WriteAllBytes("C:\\\\Users\\\\Sniper\\\\Desktop\\\\array3.txt", (byte[])Program.byteArr);
		}
	}
}

This is the line that doesn't work:

C#

File.WriteAllBytes(@"C:\\Users\\Sniper\\Desktop\\array3.txt", 
(byte[])byteArr);

Picture describing the problem:
https://g.top4top.io/p_2072tzl4e1.png[^]
What can I do?

What I have tried:

I tried many times but failed every time

Posted 3-Sep-21 1:17am

Nisrja

Updated 3-Sep-21 1:28am

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Richard Deeming · Answer 1 · 2021-09-03T01:28:00

Read the error message again. Your byte array is called fileBytes, but you are trying to write an uninitalized field called byteArr into the file.

Your code can be simplified to:

C#

using System;
using System.IO;

internal static class Program
{
    static void Main()
    {
        byte[] fileBytes = File.ReadAllBytes(@"C:\Users\Sniper\Desktop\array3.bin");
        File.WriteAllBytes(@"C:\Users\Sniper\Desktop\array3.txt", fileBytes);
    }
}

But this code makes no sense. You are simply copying the file and changing the extension. The bytes from the source file almost certainly won't make sense as text.