Reading editing and writing .bin file in C#

Question

I just started my adventure with C#. I want to write simple program that will read .bin file with OpenFileDialog, edit part of the file, and save the file with SaveFileDialog.

Unfortunately I have some problems probably because I have to learn a lot. Here is part of my code for reading but I have problems to save same file. Basically I think problem is with starting address and ending address because I don't know how to declare this in write function.

    OpenFileDialog ofd = new OpenFileDialog();
   
    private void button1_Click(object sender, EventArgs e)
    {
        ofd.ShowDialog();
        BinaryReader br = new BinaryReader(File.OpenRead(ofd.FileName));
        
        br.Close();
    }


    SaveFileDialog sfd = new SaveFileDialog();

    private void button2_Click(object sender, EventArgs e)
    {
        sfd.ShowDialog();
        BinaryWriter br= new BinaryWriter(File.OpenWrite(sfd.FileName));

        br.Close();
    }

I want to write same file back the length of file is always 8192 bytes so start from 0x0000 until 0x1FFF.

Answer 1

If I get you correctly, you are trying to read from a file, edit it and save the edited file. I think what you are missing is the actual reading

string s = br.ReadString();

and writing

bw.Write(s);

to the file (bw is BinaryWriter).

check out a simple tutorial on reading and writing with binary reader/writer.