我有一个要求用户输入密码的Perl脚本。我怎么也只能随声附和“*”代替字符的用户类型，因为他们类型呢？
我使用的是Windows XP / Vista操作系统。
你可以玩期限:: ReadKey。这是一个很简单的例子，一些检测退格键和删除键。我测试了它在Mac OS X 10.5，但根据它应该工作在Windows下的ReadKey manual。该manual表明，在Windows下使用非阻塞读（ReadKey(-1)）将失败。这就是为什么我使用ReadKey（0）谁基本上getc（更多GETC在libc manual）。
#!/usr/bin/perl
use strict;
use warnings;
use Term::ReadKey;
my $key = 0;
my $password = "";
print "\nPlease input your password: ";
# Start reading the keys
ReadMode(4); #Disable the control keys
while(ord($key = ReadKey(0)) != 10)
# This will continue until the Enter key is pressed (decimal value of 10)
{
# For all value of ord($key) see http://www.asciitable.com/
if(ord($key) == 127 || ord($key) == 8) {
# DEL/Backspace was pressed
#1. Remove the last char from the password
chop($password);
#2 move the cursor back by one, print a blank character, move the cursor back by one
print "\b \b";
} elsif(ord($key) < 32) {
# Do nothing with these control characters
} else {
$password = $password.$key;
print "*(".ord($key).")";
}
}
ReadMode(0); #Reset the terminal once we are done
print "\n\nYour super secret password is: $password\n";
在过去，我已经使用IO::Prompt这一点。
use IO::Prompt;
my $password = prompt('Password:', -e => '*');
print "$password\n";
如果你不希望使用任何套餐......仅用于UNIX
system('stty','-echo');
chop($password=<STDIN>);
system('stty','echo');
你应该看看要么Term::ReadKey或Win32::Console。您可以使用这些模块来读取单次击键，并发出“*”或whathever。
在Pierr - 吕克的计划的基础上，刚添加的反斜杠一些控制。有了这个，你不能永远保持按下反斜线：
sub passwordDisplay() {
my $password = "";
# Start reading the keys
ReadMode(4); #Disable the control keys
my $count = 0;
while(ord($key = ReadKey(0)) != 10) {
# This will continue until the Enter key is pressed (decimal value of 10)
# For all value of ord($key) see http://www.asciitable.com/
if(ord($key) == 127 || ord($key) == 8) {
# DEL/Backspace was pressed
if ($count > 0) {
$count--;
#1. Remove the last char from the password
chop($password);
#2 move the cursor back by one, print a blank character, move the cursor back by one
print "\b \b";
}
}
elsif(ord($key) >= 32) {
$count++;
$password = $password.$key;
print "*";
}
}
ReadMode(0); #Reset the terminal once we are done
return $password;
}
使用Pierr - 吕克的计划
# Start reading the keys
ReadMode(4); #Disable the control keys
while(ord($key = ReadKey(0)) != '13' )
# This will continue until the Enter key is pressed (decimal value of 10)
{
# For all value of ord($key) see http://www.asciitable.com/
if(ord($key) == 127 || ord($key) == 8 && (length($password) > 0)) {
# DEL/Backspace was pressed
#1. Remove the last char from the password
chop($password);
#2 move the cursor back by one, print a blank character, move the cursor back by one
print "\b \b";
} elsif(ord($key) > 32) {
$password = $password.$key;
print "*";
}
}
ReadMode(0); #Reset the terminal once we are done
您是否尝试存储字符串（让你的程序仍然可以读取它），并找出它的长度，然后创建相同长度的字符串，但只能用“*”？