Unable to see minus Terminator NULL

Question

I struggled with this for a while. I created a utility that allows you to open .TXT files. These text files contain PCL (print command language). When I import a new file, it is truncated with \ 0 (NULL Terminator). Since PCL files contain graphic images randomly in everything that I import, it is truncated in the first bitmap, because bitmaps start with NULL.

This is the exact problem, like here: Displaying raw data from an image file using a TextBox or RichTextBox?

Unfortunately, I can not comment on this topic, although because of my low (newbies) reputation (15 repetitions are needed). Also unable to insert a screenshot (10 repetitions required).

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This is how Notepad ++ displays information:

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RichTextBox :

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(Zoomed out):

, (PCL). .

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(: RichTextBox, , RichTextBox ):

byte[] bytes = new byte[2048];
string data = System.Text.Encoding.ASCII.GetString(bytes);
dragDropRichTextBox1.Text = data.Replace("\0", @"1");

2048 "1", . .

, :

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

namespace PCL_Utility
{
    public class DragDropRichTextBox : RichTextBox
    {
        public DragDropRichTextBox()
        {
            this.AllowDrop = true;
            this.DragDrop += DragDropRichTextBox_DragDrop;
        }

        void DragDropRichTextBox_DragDrop(object sender, DragEventArgs e)
        {
            //string[] fileText = e.Data.GetData(DataFormats.FileDrop) as string[];
            string[] fileText = e.Data.GetData(DataFormats.FileDrop) as string[];

            if (fileText != null)
            {
                foreach (string name in fileText)
                {
                    try
                    {
                        this.AppendText(File.ReadAllText(name) + "\n -------- End of File -------- \n\n");
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);  
                    }
                }
            }
        }
    }
}

Answer 1

, , , .

, . "\ 00" ASCII 127.

    public static class BinaryFile
    {

        private static string[] __byteLookup = new string[256];

        static BinaryFile()
        {
            // Display printable ASCII characters as-is
            for (int i = 0x20; i < 0x7F; i++) { __byteLookup[i] = ((char)i).ToString(); }

            // Display non-printable ASCII characters as \{byte value}
            for (int i = 0; i < 0x20; i++) { __byteLookup[i] = "\\" + i.ToString();}
            for (int i = 0x7F; i <= 0xFF; i++) { __byteLookup[i] = "\\" + i.ToString(); }

            // Replace pre-populated values with custom values here if desired.
        }

        public static string ReadString(string filename)
        {
            byte[] fileBytes = System.IO.File.ReadAllBytes(filename);

            return String.Join("", (from i in fileBytes select __byteLookup[i]).ToArray());
        }
    }

, , :

   void DragDropRichTextBox_DragDrop(object sender, DragEventArgs e)
    {
        string[] fileText = e.Data.GetData(DataFormats.FileDrop) as string[];

        if (fileText != null)
        {
            foreach (string name in fileText)
            {
                try
                {
                    // Read each file using the helper class rather than File.ReadAllText
                    // then append the end-of-file line
                    this.AppendText(BinaryFile.ReadString("your_file_name.txt") 
                        + "\n -------- End of File -------- \n\n");
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);  
                }
            }
        }
    }

Answer 2

, ASCII. ASCII - 7- . , ( 128 255), . ASCII .

-, Windows , . '\0'. , .

"" , ( , ). . :

byte[] fileBytes = File.ReadAllBytes("filename");

, , , . - :

StringBuilder sb = new StringBuilder();
foreach (var b in fileBytes)
{
    // handle printable characters
    if (b >= 32 || b == 10 || b == 13 || b = 9) // lf, cr, tab
        sb.Append((char)b);
    else
    {
        // handle control characters
        switch (b)
        {
            case 0 : sb.Append("(nul)"); break;
            case 27 : sb.Append("(esc)"); break;
            // etc.
        }
    }
}

, switch, , , . , , . - :

private Dictionary<byte, string> Conversions = new Dictionary<byte, string>()
{
    {0, "(nul)"},
    {27, "(esc)"},
    // etc.
};

:

foreach (var b in fileBytes)
{
    string s;
    if (Conversions.TryGetValue(b, out s))
    {
        sb.Append(s);
    }
    else
    {
        sb.Append((char)b);
    }
}