C# problem

This is a discussion on C# problem within the C# Programming forums, part of the General Programming Boards category; Does anyone know how to store the contents of a file then read to a string array, then convert it ...

  1. #1
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    C# problem

    Does anyone know how to store the contents of a file then read to a string array, then convert it to hex, then read it to a richtextbox and then read to a second string and convert it back to text and save to the original file?

    the file is opened through the openfiledialog method; where I then browse for the file (using a filter) select and the open i.e -:

    Code:
                     OpenFileDialog dialog = new OpenFileDialog();
                    dialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
                    dialog.InitialDirectory = "@c:\\";
                    dialog.Title = "Select a text file";
    I tried using this :

    Code:
                    StreamReader streamReader = new StreamReader(OpenFileDialog.dialog);
                    string text = streamReader.ReadToEnd();
                    streamReader.Close();
    to read the file to a string, But the variable after new StreamReader(.... ) I can't quite get. Any help would be much appreciated.

  2. #2
    Confused Magos's Avatar
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    I'm to tired to even remotely understand that cryptic question, however to read the contents from a file to a string there is a very useful wrapper function:
    Code:
    System.Windows.Forms.OpenFileDialog FileDialog = new System.Windows.Forms.OpenFileDialog();
    FileDialog.Filter = ""; //Enter filter here
    
    if(FileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
    {
      string Text = System.IO.File.ReadAllText(FileDialog.FileName);
    }
    There's also a similar ReadAllLines function if you prefer to get a string[], one string per line.
    MagosX.com

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  3. #3
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    Thanks

    Thankyou Magos, The code has helped me and has got rid of much of the garbage I had in before! Now, using that code, where the file is now in the string, how can I now convert that to hex? and then load the converted data into the richtextbox? Sorry if that doesn't make much sense

  4. #4
    Confused Magos's Avatar
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    What do you mean "to hex"?
    To enter text into a richtextbox, simply:
    Code:
    MyRichTextBox.Text = "Hi there!";
    MagosX.com

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  5. #5
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    Heaxadecimal, the text file containts only A-Z characters, which I want to convert to hexadecimal format. Then ouput the new string text to the richtextbox.

  6. #6
    Confused Magos's Avatar
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    I'm sure you could traverse the string character by character and convert them one by one. Doesn't sound too effective, I'm sure there are better ways.
    Code:
    string Text = "Yatta!";
    string HexText = "";
    char[] HexTable = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
    
    foreach(char Character in Text.ToCharArray())
    {
    	int HexValue = (int)Character;
    	HexText += HexTable[HexValue / 16];
    	HexText += HexTable[HexValue % 16];
    }
    MagosX.com

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  7. #7
    a_capitalist_story
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    Assuming the file is ASCII encoded:
    Code:
    string text = "BlahDiBlahBlahBlah";
    StringBuilder sb = new StringBuilder(text.Length * 2);
    foreach (byte b in ASCIIEncoding.ASCII.GetBytes(text))
    {
        sb.AppendFormat("{0:x2}", b);
    }
    Console.WriteLine(sb.ToString());

  8. #8
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    Sorry, i was perhaps a bit unclear. The program is for a windows application. the user browses the directory and selects the file. SO I want to know how to read that file to a string, but with a variable i.e string string1.... etc so I can then load the contents of the string into text box (once converted) but just knowing the process to load the string to textbox would be great.

  9. #9
    a_capitalist_story
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    So Magos gave you how to read the file into a string, and how to set the .Text property to equal a string, and Magos and I both gave you ways to create a hexadecimal string from a regular old string. Seems you should just be able to put A + B + C together to get what you want.

  10. #10
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    Ok, I've done it....basically. There isa bit of cleaning up needs to be done but this is it so far -:

    Code:
    using System;
    using System.IO;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    
    namespace WindowsApplication1
    {
        public partial class Form1 : Form
        {
            public string ConvertToHex(string asciiString)
            {
                string hex = "";
                foreach (char c in asciiString)
                {
                    int tmp = c;
                    hex += "0x";
                    hex += String.Format("{0:x2}", (uint)System.Convert.ToUInt32(tmp.ToString()));
                    
                    hex += " ";
                }
                return hex;
            }
            public Form1()
            {
                InitializeComponent();
            }
    
            private string fileName;
            private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
            {
                MessageBox.Show("Written by James");
            }
    
            private void openToolStripMenuItem_Click(object sender, EventArgs e)
            {
                OpenFileDialog filechooser = new OpenFileDialog();
                filechooser.Filter = "Text files|*.txt";
    
                DialogResult result = filechooser.ShowDialog();
                if (result == DialogResult.Cancel)
                    return;
    
                fileName = filechooser.FileName;
                if (fileName == "" | fileName == null)
                    MessageBox.Show("Invalid Name", "Error");
    
                else
    
                {
                    richTextBox1.Text ="";
                    try
                    {
                       StreamReader mystream = new StreamReader(fileName);
                        string input = "";
                        string inputhex = "";
                        input += mystream.ReadToEnd();
                        inputhex=ConvertToHex(input);
                        richTextBox1.Text += inputhex;
                        richTextBox2.Text += input;
    
                        string output = "";
                            output+= input;
    
    
                    }
                    catch(IOException)
                        {
                            MessageBox.Show ("Can't open File");
    
    
                        }
    
                        
            }
    
            
        }
    
            private void richTextBox2_TextChanged(object sender, EventArgs e)
            {
                
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                Application.Exit();
            }
    
            private void saveToolStripMenuItem_Click(object sender, EventArgs e)
            {
    
            }
        }
    }
    However, i want to add a function that will write and convert a new string back to ASCII, and then save to a text file using savefiledialog Any ideas? (the above code works, ignore the empty event handlers, They aren't crucial at this tage)

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