DenisD. DenisD. - 1 month ago 13
C# Question

Strange Notepad++ HEX-editor pluging

The goal is to write byte array to file.
I have byte array fits[] with some bytes and then:

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

namespace _32_to_16
{
class Program
{
static void Main(string[] args)
{
byte[] fits = File.ReadAllBytes("1.myf");
byte[] img = new byte[fits.Length / 2];
for (int i = 0; i < fits.Length; i += 4) //Drops 2 high bytes
{
img[i/2] = fits[i + 2];
img[i/2 + 1] = fits[i + 3];
}
File.WriteAllBytes("new.myf", img);
}
}
}


Before writing to the file img[] has same values:


  • img[0]=0x31

  • img[1]=0x27

  • img[2]=0x31

  • img[3]=0xe2

  • and so on...



After writing to file, in HEX editor i see


  • 00000000: 31 27 31 3f and other wrong values.



Sometimes, with other fits[] values, img[] array write correctly to file. What I`m doing wrong?

File for test 1.myf (which makes wrong results) https://www.dropbox.com/s/6xyf761oqm8j7y1/1.myf?dl=0
File for test 2.myf (correct writes to file) https://www.dropbox.com/s/zrglpx7kmpydurz/2.myf?dl=0

I simplified the code:

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

namespace _32_to_16
{
class Program
{
static void Main(string[] args)
{
byte[] img_correct = new byte[8] { 0xbd, 0x19, 0xbd, 0x72, 0xbd, 0x93, 0xbd, 0xf7 };
File.WriteAllBytes("img_correct.myf", img_correct);

byte[] img_strange = new byte[8] { 0x33, 0x08, 0x33, 0xac, 0x33, 0xe3, 0x33, 0x94 };
File.WriteAllBytes("img_strange.myf", img_strange);
}
}
}


in HEX-editor img_correct.myf looks like this:
bd 19 bd 72 bd 93 bd f7

in HEX-editor img_strange.myf looks like this:
33 08 33 3f 3f 3f

Answer

You're using the HEX-Editor plugin from Notepad++, which seems to have a problem reading binary files.

Try with another hex editor and it should display the correct values.

Here's a screenshot of HxD and HEX-Editor displaying the same file as you can see here

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