What is the last character of richtextbox1.text that has 3 lines

Question

1.00/5 (2 votes)

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In richTextBox1 I wrote these three lines:

line1
line2
line3

When I send this text to whatsapp as a message, the three lines become one line. I need to separate that single line to 3 separate lines. I am not able to do so.

If I could find the last character of each line (assume I found '@')

C#

richTextBox1.Text= richTextBox1.Text.Replace("@", "@" + System.Environment.NewLine);

I can insert new line.

How could I do that in each line?

What I have tried:

C#

char[] charArr = new char[50];
     string text = richTextBox1.Text;
     int len = richTextBox1.Text.Length;
     text.CopyTo(0, charArr, 0, len);

     byte[] bytes = Encoding.ASCII.GetBytes(text);
     string newText = Encoding.ASCII.GetString(bytes);

     newText.CopyTo(0, charArr, 0, len);
  for (int i = 0; i < len; i++)
  {
  //I am searching for '\0' or '\n'. It does not seems it is there
  MessageBox.Show(newText.Substring(i,1),"byte="+bytes[i].ToString()+"ch="+
  charArr[i].ToString());
  }

Posted 4-Sep-23 2:37am

Engineer khalid

Updated 8-Sep-23 11:06am

Deeksha Shenoy

v4

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3 solutions

Solution 1

Start by finding out what exactly you are getting from the Rich text box: use the debugger to look at the string text.
If that contains newlines ("\n") - and it should do - then check the charArr content.
I see newline characters exactly where I expect them if I try your code here ... they are byte values, so you are looking for "10" which is a "Line Feed" character in ASCII, "\n" in Unicode.

It's possible that you need to replace the '\n' with '\r' or "\r\n" to work with whatsapp.

Posted 4-Sep-23 2:55am

OriginalGriff

Comments

Engineer khalid 4-Sep-23 15:49pm

i beleive whatsapp will not accept \r\n for new line it concacnate all 3 lines in one single line
i will post the whole program here may be somebody solve it

Solution 2

Assuming each line contains a newline character at the end, you can extract them as an array, as described at TextBoxBase.Lines Property (System.Windows.Forms) | Microsoft Learn[^]. To send them to Whatsapp you need to check the Whatsapp documentation to see which character(s) they use to separate the lines.

Posted 4-Sep-23 3:01am

Richard MacCutchan

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Engineer khalid · Accepted Answer · 2023-09-04T09:54:00

<pre>using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MansoorBuildding
{
    public partial class WhatsAppForm : Form
    {
        char[] chary = new char[100];
        string[] CleanedString = new string[100];
        int len = 0;

        public WhatsAppForm()
        {
            InitializeComponent();
        }

        private void SendWhatUpMessage(string Message, string Number)
        {
            try
            {
                if (Number == "") MessageBox.Show("No number added");
                if (Number.Length <= 0)
                {
                    Number = "+966" + Number;
                }
                //Number = Number.Replace("","");
                System.Diagnostics.Process.Start("https://api.Whatsapp.com/send?phone=" + Number + "&text=" + Message);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        private void btnSendClick(object sender, EventArgs e)
        {
            int j, counter, Nline;
            string[] tempArray = richTextBox1.Lines;
            string str = "";
            Nline = richTextBox1.Lines.Count();
            Nline--;

            for (counter = 0; counter < Nline; counter++)
            {
                System.Diagnostics.Debug.WriteLine(tempArray[counter]);
                len = tempArray[counter].Length;

                tempArray[counter].CopyTo(0, chary, 0, len);

                CleanedString[counter] = "";
                for (j = 0; j < len; j++)
                    CleanedString[counter] += chary[j].ToString();
            }

            str = "";
            for (counter = 0; counter < Nline; counter++)
            {
                if (counter < Nline - 1) str += CleanedString[counter] + "%0a";//<=== add "%0a"  not \r\n
                else if (counter == Nline - 1) str += CleanedString[counter];
            }

            SendWhatUpMessage(str, textBoxMobileNo.Text);
        }
        public void ClearNumberAndMessage()
        {
            textBoxMobileNo.Text = "";
            richTextBox1.Text = "";
        }
    }
}