Masking input

How would one go about masking an input... Like when entering passwords and pins and such? Running Windows Vista, making a Console app. Thanks guys.

Quote:

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Originally Posted by bradszy

How would one go about masking an input... Like when entering passwords and pins and such? Running Windows Vista, making a Console app. Thanks guys.

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You probably think you are the first who is asking this question...

Search forum for similar posts, read the answers, write your code and ask question about problems you encountered

For the start - read thsi http://faq.cprogramming.com/cgi-bin/...&id=1043284392

It explains how you can read an input before user press enter

I'm having some trouble using it. Here's my code:

Code:

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#include <iostream>
#include <cstdlib>
#include <windows.h>
#include <winable.h>
#include <string>
#include <winuser.h>
#include <stdio.h>
#include <conio.h>
#include <ctype.h>


using namespace std;
int main(int argc, char *argv[])
{
int ch;
int i = 0;
char PROTECTEDLOL[12];
char password[90];
int SECRETANSWER;
LOL:
system("color fc");
system("cls");

puts ("What would you like to do?");
puts ("Enter password");
puts (" OR " );
puts ("Press [2] To Exit" );
fflush(stdout);

 while ((ch = getch()) != EOF
          && ch != '\n'
          && ch != '\r'
          && i < sizeof(PROTECTEDLOL) - 1)
  {
    if (ch == '\b' && i > 0)
    {
      printf("\b \b");
      fflush(stdout);
      i--;
      PROTECTEDLOL[i] = '\0';
    }
    else if (isalnum(ch))
    {
      putchar('*');
      PROTECTEDLOL[i++] = (char)ch;
    }
  }

if (PROTECTEDLOL=="password")
{
       
        puts ("Hi");
}

else if (PROTECTEDLOL=="2")
{
    cout<<endl<<endl<<"Bye"<<endl;
    Sleep(3000);
    return 0;
    }
       
    else
        {
                MessageBox(NULL, "Password is invalid", "Denied", 48 | 1);
                MessageBox(NULL, "Access is denied", "Denied", 48 | 1);
                goto LOL;
        }
       
return 0;
}

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It gives me my error EVERY time. I don't know how to make it work. Any help? Thanks.

conio and getch are for Borland compilers
what compiler are you using?
what is the error?

Dev-C++,
And by 'my error' I'm refering to line 62, my 'else' statement.
I've looked in Dev-C++'s 'include' directory, and conio.h is in there.
Thanks to anyone that can help with my problem.

Code:

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if (PROTECTEDLOL=="password")

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This compares pointers -> will never be true
use strcmp()
Kurt

Like:

Code:

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strcmp(PROTECTEDLOL=="password");

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?

more like

Code:

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if ( strcmp(PROTECTEDLOL,"password") == 0 )

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or

Code:

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if ( !strcmp(PROTECTEDLOL,"password"))

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Kurt

Oh thankyou.

EDIT:

Code:

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#include <iostream>
#include <cstdlib>
#include <windows.h>
#include <winable.h>
#include <string>
#include <winuser.h>
#include <stdio.h>
#include <conio.h>
#include <ctype.h>


using namespace std;
int main(int argc, char *argv[])
{
int ch;
int i = 0;
char PROTECTEDLOL[BUFSIZ];
char password[BUFSIZ];
int SECRETANSWER;
LOL:
system("color fc");
system("cls");

puts ("What would you like to do?");
puts ("Enter password");
puts (" OR " );
puts ("Press [2] To Exit" );
fflush(stdout);

 while ((ch = getch()) != EOF
          && ch != '\n'
          && ch != '\r'
          && i < sizeof(PROTECTEDLOL) - 1)
  {
    if (ch == '\b' && i > 0)
    {
      printf("\b \b");
      fflush(stdout);
      i--;
      PROTECTEDLOL[i] = '\0';
    }
    else if (isalnum(ch))
    {
      putchar('x');
      PROTECTEDLOL[i++] = (char)ch;
    }
  }

if ( !strcmp(PROTECTEDLOL,"password"));
{
       
        puts ("Hi");
}

else if ( !strcmp(PROTECTEDLOL,"2"))
{
    cout<<endl<<endl<<"Bye"<<endl;
    Sleep(3000);
    return 0;
}
       
    else
        {
                MessageBox(NULL, "Password is invalid", "Denied", 48 | 1);
                MessageBox(NULL, "Access is denied", "Denied", 48 | 1);
                goto LOL;
        }
       
return 0;
}

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ERRORS:

Code:

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55 C:\Users\bradszy\Desktop\Untitled1.cpp expected primary-expression before "else"
55 C:\Users\bradszy\Desktop\Untitled1.cpp expected `;' before "else"
62 C:\Users\bradszy\Desktop\Untitled1.cpp expected primary-expression before "else"
62 C:\Users\bradszy\Desktop\Untitled1.cpp expected `;' before "else"

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Code:

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if ( !strcmp(PROTECTEDLOL,"password"));  <<-- remove that semicolon

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Still says invalid password. This is interesting.

Quote:

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Originally Posted by bradszy

Still says invalid password. This is interesting.

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Guess PROTECTEDLOL is not properly terminated
try

Code:

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    else if (isalnum(ch))
    {
      putchar('x');
      PROTECTEDLOL[i++] = (char)ch;
      PROTECTEDLOL[i] = 0;
    }

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Kurt

Thanks Kurt, you're pretty good at this eh? Worked perfectly. Thanks again, it's really appreciated.

Another suggestion for you, in case you have time or is willing: http://cpwiki.sf.net/Indentation
Good luck.

I'm partial to this implementation - no particular reason ;)
http://cboard.cprogramming.com/showp...94&postcount=5

gg

Written in C, but could be easily adapted to return std::string and such:

Code:

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char *getPass(char *szBuffer, size_t len)
{
        size_t i;
        HANDLE hIn = GetStdHandle(STD_INPUT_HANDLE);
        HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
        DWORD dwOld, dwNumRead, dwNumWritten;
        if((hIn != INVALID_HANDLE_VALUE) && (hOut != INVALID_HANDLE_VALUE))
        {
                if(GetConsoleMode(hIn,&dwOld))
                {
                        if(SetConsoleMode(hIn,ENABLE_PROCESSED_INPUT))
                        {
                                for(i=0;i<len-1;i++)
                                {
                                        if(ReadConsole(hIn,&szBuffer[i],1,&dwNumRead,NULL))
                                        {
                                                if(szBuffer[i] == '\r')
                                                {
                                                        break;
                                                }
                                                else WriteConsole(hOut,"*",1,&dwNumWritten,NULL);
                                        }
                                        else break;
                                }
                                WriteConsole(hOut,"\n",1,&dwNumWritten,NULL);
                                szBuffer[i] = '\0';
                                SetConsoleMode(hIn,dwOld);
                                return szBuffer;
                        }
                }
        }
        return NULL;
}

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