about password

[Unregistered]

I'm a newbie in C
Recently I meet a problem that I don't know is there any solution can solve it!

I want to write a function that the prog will display a '*' after I input 1 character.

I was tried getch().But not work as my imagine

Can any one help me?

[Prelude]

Perhaps you could view the many theads on this topic that have already been answered with the search function.

-Prelude

[hkNewbie]

tks alot

[lemurian]

#include <conio.h>
#include <iostream.h>

int main()
{
char *pass;

pass=getpass("");

cout<<pass;
}

[quzah]

> #include <conio.h>
> #include <iostream.h>

What's wrong with this picture? Oh, I know! This is not the C++ board!

Quzah.

[Bull]

Below is some code I wrote a while ago which could be improved, etc, it will accept upto 20 characters and will display the character but when delete is hit will return a ., should be pretty easy to change.

void prompt(char word[21])
{
	char ch;

	for (ch=0;ch<21;ch++)
		word[ch]='\0';
	do
	{
		ch = getch();
		if (ch==8 && strlen(word)>0)        /*if backspace is pressed*/
		{
			if (strlen(word)==20)
				_setcursortype(2);
			textcolor(7);
			word[strlen(word)-1]='\0';
			cprintf("\b.\b");
		}
		else
		if ((ch>=32) && (ch<=255) && ((strlen(word))<20))  /*if a key is pressed*/
		{
			textcolor(15);
			word[strlen(word)]=ch;
			cprintf("%c",ch);
			if (strlen(word)==20)
				_setcursortype(0);
		}
		else
		if ((ch==8 && strlen(word)==0) || (ch>=32 && ch<=255 && strlen(word)==20))
			printf("\a");
	} while(ch != 13);                              /*until enter is pressed*/
}

the line that says: cprintf("%c",ch);
change to cprintf("*");
and it should make it all work perfectly, if you need more characters change the values refering to 20 and 21 to a higher number or better yet declare a constant to hold it.
Hope this helps

[Prelude]

>and it should make it all work perfectly
Assuming that the guy uses a Borland compiler, which is the only one to my knowledge that supports all of the nonstandard functions that you use in that snippet.

-Prelude

[Bull]

I dont really know the difference between the compilers honestly, which parts in particular are borland specific?

[Prelude]

Everything in conio.h is implementation defined and nonstandard. The only two functions from conio in that program that I have with MSVC++ is cprintf and getch. I also have Borland C++, but nonstandard functions are best avoided when possible.

-Prelude

[Unregistered]

this functions will go rghit:

int getcode(void)
{
	int t;
	t = getch();
	
	if ( ( t == 0 ) || ( t == 0xE0 ) )
		t = getch() ;

	return t;
}
//---------------------------------------
//---------------------------------------
void getpass(char pass[])
{ 

	int i, c;
	i=0;
	c=0;

		c = getcode();

			while( (c != 13) && (i < 8) ) 
			{ 
				if( c == 8 )
				{
					if( i == 0 )
						;	// Do Nothing....
					else
					{
						i-- ;
						printf("\b \b");	//Back than print blank ' ' then back...
					}//else
				}
				else if( ((c>=65) && (c<=90)) || (( c>=97 ) && ( c<=122 )) || (( c>=48 ) && ( c<=57 )))
				{	// make sure that the input is not anything but A-Z || a-z || 0-9 ...
					pass[i] = c ;
					i++ ;
					printf("*");
				}//else if
					
				c=getcode();
			}//while 
	
			if( i<8 ) pass[i] = '\0';
			// give the string NULL if not full (less than 8) ...
}// getpass

see you