Replacing special characters in C#

[Madmartigan]

Hi all

I am trying to figure out how to replace a passwordchar of '*' in a windows form textbox, with a valid character entry entered by a user.

Using Sharpdevelop and the textbox is already instantiated with a randomly generated word. I'm now trying to capture a keypress event in a second textbox and if any of the characters entered matches that of textbox1 I'd like to reveal the character in place of the passwordchar '*".

void TextBox2KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
        	
        char l = e.KeyChar;
        string upper = l.ToString().ToUpper();
        l = upper[0];
		

               if (TheGuessManager.GotALetter(l) == true)
	      {
	      // this works but it changes every PassWordChar to the      
                      // correctly guessed letter					      textBox1.PasswordChar = e.KeyChar;
				
	      }
        }

[Madmartigan]

Hi

I have attempted this with the follwoing method but am still having no joy.

I have two textboxes. One contains a databinding for a random word that is generated. The other textbox is linked to the first through keypress events(see below).

The characters are hidden(password char set to '*') in textbox1. I would like the hidden characters to change from '*' to the respective keypress event(character ) in textbox2, if the character is contained in the hidden word in textbox2.

Is the property of passwordchar on a textbox able to be manipulated on individual characters in that textbox?

This is for a Hangman game I am trying to develop.

Thanks for any help.

void TextBox2KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
        	
        	char l = e.KeyChar;
			
			if (UserGuess.GotALetter(l) == true)
			{
				int intResult;
				string str1 = textBox1.Text;
				intResult = str1.IndexOf(l);
				
				
				StringBuilder sb = new StringBuilder(str1);
				
				 
				for (int i = 0; i < sb.Length; i++)
				{	
					sb.Replace('*', l, intResult, 1);
			    	string str = sb.ToString();
					this.textBox1.Text = str;
				}
			}
}

[LorenVS]

Hello,

Alright, I think I understand what you're trying to do... I'm not quite sure how your form is set up, so here is what I believe your function should look like:

I believe the problem you are having is because you are trying to use passwordchar, which is less than a great idea, since you're trying to have some characters visible. A better bet would be to initial fill the entire textbox with '*'s manually and disable the textbox...

string password = "* **** * *****";
string decrypted = "I LOVE C SHARP";

protected void Initialize() // or some other startup function
{
       PasswordTB.Text = password;
       PasswordTB.Enabled = false;
}
protected void KeyPress(object s, KeyPressEventArgs e)
{
       char PressedLetter = e.KeyChar; //Or whatever the property is

       for(int i = 0; i < decrypted.Length; i++)
       {
            if(decrypted[i] == PressedLetter)
                  password[i] = PressedLetter;
       }

       PasswordTB.Text = password;
}

You could then update your text box's accordingly

[Madmartigan]

Loren, You are a champ!!!

I've been so taken in by trying to change the property of PasswordChar that I didn't think of an alternative. Anyhow, I've now amended the code as below and it works a treat. Thanks a million....been stuck on this for 3 days :)

My next step is to get the second loop to work the same as the first if the user opts to play a second game. Feel like a weight has been taken off. Owrooha.

       private void Hidden_Load(object sender, System.EventArgs e) 
        {
        	textBox1.DataBindings.Add("text", UserGuess.GetSecretWord(), null);
      		
        	StringBuilder sa = new StringBuilder(textBox1.Text);
        	
        	for(int i = 0; i < sa.Length; i++)
        	{
        		sa[i] = '*';
        		
        	}
        	
        	textBox1.Text = sa.ToString();
        	textBox1.Enabled = false;
        	
        }

       void TextBox2KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
        	
        	char l = e.KeyChar;
			
			if (UserGuess.GotALetter(l) == true)
			{
				// get the password length and characters '*'
				StringBuilder sb = new StringBuilder(textBox1.Text);
				StringBuilder sc = new StringBuilder(this.UserGuess.GetSecretWord());
 				
       			for(int i = 0; i < sc.Length; i++)
      			 {
           			 if(sc[i] == l)
                 	 sb[i] = l;
       			 }
 
       			textBox1.Text = sb.ToString().ToUpper();
					

          }

Had to use StringBuilder instaed cause it kept complaining that the index was read only. Fair game. Thanks again.