How to disable/enable displaying user input in console

[kimso.zhao]

Hi All,

I need a function that when user types a password in the console, the
password should be invisible (e.g. display nothing or display "*"
instead). Just as you can see when you login a machine.

How to implement this? Thanks!
Note: user is typing passord in the console.

 

[Thomas Tutone]

I need a function that when user types a password in the console, the
password should be invisible (e.g. display nothing or display "*"
instead). Just as you can see when you login a machine.

How to implement this? Thanks!
Note: user is typing passord in the console.

Your question is answered in the FAQ:

http://www.parashift.com/c++-faq-lite/input-output.html#faq-15.18

Best regards,

Tom

 

[Rolf Magnus]

Hi All,

I need a function that when user types a password in the console, the
password should be invisible (e.g. display nothing or display "*"
instead). Just as you can see when you login a machine.

How to implement this? Thanks!
Note: user is typing passord in the console.

There is no standard C++ way to do that, because the C++ doesn't define a
console, but rather only an input stream (that may be connected to a
keyboard or not) and some output streams (that may be connected to a
display or not). You will need some platform-specific functions.
Maybe the (n)curses library can help you.

 

[Ron Natalie]

Hi All,

I need a function that when user types a password in the console, the
password should be invisible (e.g. display nothing or display "*"
instead). Just as you can see when you login a machine.

How to implement this? Thanks!
Note: user is typing passord in the console.

What consoles do is system dependent. You need to ask
in a group for your operating system (and possibly
windowing system) ... windows, unix, etc...

C++ doesn't address this.

 

[Jim Langston]

Hi All,

I need a function that when user types a password in the console, the
password should be invisible (e.g. display nothing or display "*"
instead). Just as you can see when you login a machine.

How to implement this? Thanks!
Note: user is typing passord in the console.

Use whatever OS specific call you have to read a key from the keyboard. It
is different for each OS. Then get a keypress, and print "*" to the screen.

char Input;
std::string Password;
while ( Input = FunctionToGetKeypress() != 13 ) // 13 is usually enter
{
Password += Input;
std::cout << "*";
cout.flush(); // May or may not be needed
}
std::cout << std::endl;

for Windows it's getch()
Not sure for linux.
check for your OS what function it is to get a single key press.