How to read file binary in C#?

Question

I want to make a method that takes any file and reads it as an array of 0s and 1s, i.e. its binary code. I want to save that binary code as a text file. Can you help me? Tha

Answer 1

Generally, I don't really see a possible way to do this. I've exhausted all of the options that the earlier comments gave you, and they don't seem to work. You could try this:

        `private void button1_Click(object sender, EventArgs e)
    {
        Stream myStream = null;
        OpenFileDialog openFileDialog1 = new OpenFileDialog();
        openFileDialog1.InitialDirectory = "This PC\\Documents";
        openFileDialog1.Filter = "All Files (*.*)|*.*";
        openFileDialog1.FilterIndex = 1;
        openFileDialog1.RestoreDirectory = true;
        openFileDialog1.Title = "Open a file with code";

        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            string exeCode = string.Empty;
            using (BinaryReader br = new BinaryReader(File.OpenRead(openFileDialog1.FileName))) //Sets a new integer to the BinaryReader
            {
                br.BaseStream.Seek(0x4D, SeekOrigin.Begin); //The seek is starting from 0x4D
                exeCode = Encoding.UTF8.GetString(br.ReadBytes(1000000000)); //Reads as many bytes as it can from the beginning of the .exe file
            }
            using (BinaryReader br = new BinaryReader(File.OpenRead(openFileDialog1.FileName)))
                br.Close(); //Closes the BinaryReader. Without it, opening the file with any other command will result the error "This file is being used by another process".

            richTextBox1.Text = exeCode;
        }
    }`

• That's the code for the "Open..." button, but here's the code for the "Save..." button:

  ` private void button2_Click(object sender, EventArgs e) { SaveFileDialog save = new SaveFileDialog();

      save.Filter = "All Files (*.*)|*.*";
      save.Title = "Save Your Changes";
      save.InitialDirectory = "This PC\\Documents";
      save.FilterIndex = 1;
  
      if (save.ShowDialog() == DialogResult.OK)
      {
  
          using (BinaryWriter bw = new BinaryWriter(File.OpenWrite(save.FileName))) //Sets a new integer to the BinaryReader
          {
              bw.BaseStream.Seek(0x4D, SeekOrigin.Begin); //The seek is starting from 0x4D
              bw.Write(richTextBox1.Text);
          }
      }
  }`
  

  • That's the save button. This works fine, but only shows the '!This cannot be run in DOS-Mode!' - Otherwise, if you can fix this, I don't know what to do.

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