在 Win32 上，如何使用 Perl、Python 或 Ruby（或 C）检测是否按下了 Left Shift 或 Right ALT？

在 Win32 上，您可以使用以下方法分别检测 Left Shift 和 Right ALT 是否被按下：

Perl

use Win32::API;

my $GetKeyState = Win32::API->new('user32', 'GetKeyState', 'I', 'I');

sub is_key_pressed {
    my $key_code = shift;
    return (($GetKeyState->Call($key_code) >> 15) & 1) == 1;
}

sub left_shift_pressed {
    return is_key_pressed(0x10);
}

sub right_alt_pressed {
    return is_key_pressed(0x12);
}

print "Left Shift Pressed: " . (left_shift_pressed() ? "Yes" : "No") . "\n";
print "Right ALT Pressed: " . (right_alt_pressed() ? "Yes" : "No") . "\n";

Python

import ctypes

GetKeyState = ctypes.windll.user32.GetKeyState

def is_key_pressed(key_code):
    return (GetKeyState(key_code) >> 15) & 1 == 1

def left_shift_pressed():
    return is_key_pressed(0x10)

def right_alt_pressed():
    return is_key_pressed(0x12)

print("Left Shift Pressed: Yes" if left_shift_pressed() else "No")
print("Right ALT Pressed: Yes" if right_alt_pressed() else "No")

Ruby

require 'fiddle'

GetKeyState = Fiddle::Function.new(Fiddle::Handle['user32'], 'GetKeyState', [Fiddle::TYPE_INT], Fiddle::TYPE_INT)

def is_key_pressed(key_code)
    (GetKeyState.call(key_code) >> 15) & 1 == 1
end

def left_shift_pressed
    is_key_pressed(0x10)
end

def right_alt_pressed
    is_key_pressed(0x12)
end

puts "Left Shift Pressed: Yes" if left_shift_pressed
puts "Right ALT Pressed: Yes" if right_alt_pressed

#include<windows.h>
#include<stdio.h>

int is_key_pressed(int key_code) {
    return (GetKeyState(key_code) >> 15) & 1 == 1;
}

int left_shift_pressed() {
    return is_key_pressed(0x10);
}

int right_alt_pressed() {
    return is_key_pressed(0x12);
}

int main() {
    printf("Left Shift Pressed: %s\n", left_shift_pressed() ? "Yes" : "No");
    printf("Right ALT Pressed: %s\n", right_alt_pressed() ? "Yes" : "No");
    return 0;
}

请注意，这些示例代码仅适用于 Windows 平台。如果您需要在其他平台上检测按键状态，请考虑使用其他库或方法。