[英]Reading a password from std::cin
I need to read a password from standard input and wanted std::cin
not to echo the characters typed by the user...我需要从标准输入中读取密码,并希望
std::cin
不回显用户输入的字符...
How can I disable the echo from std::cin?如何禁用 std::cin 的回声?
here is the code that I'm currently using:这是我目前使用的代码:
string passwd;
cout << "Enter the password: ";
getline( cin, passwd );
I'm looking for a OS agnostic way to do this.我正在寻找一种与操作系统无关的方式来做到这一点。 Here there are ways to do this in both Windows and *nix.
这里有一些方法可以在 Windows 和 *nix 中执行此操作。
@wrang-wrang answer was really good, but did not fulfill my needs, this is what my final code (which was based on this ) look like: @wrang-wrang 答案非常好,但没有满足我的需求,这就是我的最终代码(基于此)的样子:
#ifdef WIN32
#include <windows.h>
#else
#include <termios.h>
#include <unistd.h>
#endif
void SetStdinEcho(bool enable = true)
{
#ifdef WIN32
HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE);
DWORD mode;
GetConsoleMode(hStdin, &mode);
if( !enable )
mode &= ~ENABLE_ECHO_INPUT;
else
mode |= ENABLE_ECHO_INPUT;
SetConsoleMode(hStdin, mode );
#else
struct termios tty;
tcgetattr(STDIN_FILENO, &tty);
if( !enable )
tty.c_lflag &= ~ECHO;
else
tty.c_lflag |= ECHO;
(void) tcsetattr(STDIN_FILENO, TCSANOW, &tty);
#endif
}
Sample usage:示例用法:
#include <iostream>
#include <string>
int main()
{
SetStdinEcho(false);
std::string password;
std::cin >> password;
SetStdinEcho(true);
std::cout << password << std::endl;
return 0;
}
There's nothing in the standard for this.标准中没有任何内容。
In unix, you could write some magic bytes depending on the terminal type.在 unix 中,您可以根据终端类型编写一些魔术字节。
Use getpasswd if it's available.如果可用,请使用getpasswd 。
You can system() /usr/bin/stty -echo
to disable echo, and /usr/bin/stty echo
to enable it (again, on unix).您可以 system()
/usr/bin/stty -echo
禁用回声,并/usr/bin/stty echo
启用它(再次,在 unix 上)。
This guy explains how to do it without using "stty"; 这家伙解释了如何在不使用“stty”的情况下做到这一点; I didn't try it myself.
我自己没试过。
If you don't care about portability, you can use _getch()
in VC
.如果你不关心可移植性,你可以在
VC
使用_getch()
。
#include <iostream>
#include <string>
#include <conio.h>
int main()
{
std::string password;
char ch;
const char ENTER = 13;
std::cout << "enter the password: ";
while((ch = _getch()) != ENTER)
{
password += ch;
std::cout << '*';
}
}
There is also getwch()
for wide characters
. wide characters
也有getwch()
。 My advice is that you use NCurse
which is available in *nix
systems also.我的建议是你使用
NCurse
,它也在*nix
系统中可用。
只知道我有什么,您可以逐个字符读取密码字符,然后只打印退格键(“\\b”)和“*”。
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