Converting words to *'s

This is a discussion on Converting words to *'s within the C++ Programming forums, part of the General Programming Boards category; Garanteed everyone here has seen this done. Where text entered is turned into *'s. Like when you signed up for ...

  1. #1
    Codigious FingerPrint's Avatar
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    Converting words to *'s

    Garanteed everyone here has seen this done. Where text entered is turned into *'s. Like when you signed up for this forum, as you entered your password.

    Does anyone know how this can be done? I am just experimenting with small programs figuring little things out. This seems like something that could be useful later, and will help me out now.

    Thanks for any responses.
    Code:
    /* ------------------------------------------------------------------*/
                               // INSERT CODE HERE
    /* ------------------------------------------------------------------*/

  2. #2
    The superhaterodyne twomers's Avatar
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    Here's something. I'm sure there is (was) something in the FAQ about this, but I can't find it, so you get an example.

    Code:
    #include <iostream>
    #include <string>
    
    #include <windows.h> // I think. May not be needed, but I think VK_RETURN's there
    #include <conio.h> // doesn't make most people happy - unstandard
    
    
    std::string StarString ( void )
    {
    	std::string Password;
    	char ch;
    
    	while ( (ch=getch()) && ch!=VK_RETURN )
    	{
    		Password += ch;
    		
    		std::cout<< '*';
    	}
    
    	return Password;
    }
    
    int main( void )
    {
    	std::string pword = StarString(); // outputs stars ****
    	std::cout<< pword; // outputs what you typed
    
    	return 0;
    }
    NOTE: This is very basic! You'll have to (if you want it to be accurate), make it deal with backspaces and whatnot. I'll leave that to you.
    Last edited by twomers; 10-18-2006 at 05:23 PM.

  3. #3
    Hardware Engineer
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    Here's the FAQ twomers was looking for.

    The problem is: ANSI/ISO Standard C++ does not allow your program to accept input 'till you hit ENTER.

    Most operating systems do allow your program accept keyboard input without displaying it, and they usually allow your program to "see" the keystrokes before you hit ENTER. And, most C++ compilers also have a way of doing this.

    Just be aware that <conio.h> and getch() are common, but non-standard. There is nothing wrong with using non-standard libraries and functions... Most real-world programs do!

    It is important that you know when you are going outside the standard, and it's a good idea to document the fact with comments, just in case somebody (maybe you) wants to re-compile the program with a different compiler and/or for another platform.

  4. #4
    Rabite SirCrono6's Avatar
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    Just a little note, twomers, you should check for VK_BACKSPACE and if it is pressed you should pop off the last character of Password and std::cout << "\b \b".
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  5. #5
    Frequently Quite Prolix dwks's Avatar
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    There's something like that here, although it's written in C: http://board.theprogrammingsite.com/viewtopic.php?t=113
    dwk

    Seek and ye shall find. quaere et invenies.

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  6. #6
    The superhaterodyne twomers's Avatar
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    >> Just a little note, [...]

    I know this*. I have the equivalent function done out completely, but shaved most of the necessary stuff off so the OP could learn through improving the function. \b wrecks my head! Worst sound in the world


    * "this is very basic! You'll have to (if you want it to be accurate), make it deal with backspaces and whatnot. I'll leave that to you."

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