问题描述

我正在进行双向私人聊天，该聊天将在全屏游戏中工作.

这是需要让用户在屏幕顶部的半透明文本框中键入的半透明文本框，即使它没有焦点.

.

使用以下代码，我可以检测所有物理密钥，但使用虚拟键遇到了艰难的时光.

SHIFT被检测到.

2被检测到.

然而，Shift + 2两者都被视为单独的键(尽管[SHIFT+2]在我的键盘上给出@). IE:程序既输出shift又有2个，但不是它们产生的:@.

问题是，我将如何根据键盘转换为角色?
例如:

• 在英国键盘上，Shift+2会给我”(引号).
• 在美国键盘上，Shift +2会给我@.

如何根据键盘转换为特定字符?

这是到目前为止的代码:

static interface User32 extends Library {
    public static User32 INSTANCE = (User32) Native.loadLibrary("User32", User32.class);

    short GetAsyncKeyState(int key);
    short GetKeyState(int key);

    IntByReference GetKeyboardLayout(int dwLayout);
    int MapVirtualKeyExW (int uCode, int nMapType, IntByReference dwhkl);

    boolean GetKeyboardState(byte[] lpKeyState);

    int ToUnicodeEx(int wVirtKey, int wScanCode, byte[] lpKeyState, char[] pwszBuff, int cchBuff, int wFlags, IntByReference dwhkl);

}



public static void main(String[] args)  {   
    long currTime = System.currentTimeMillis();

    while (System.currentTimeMillis() < currTime + 20000)
    {
        for (int key = 1; key < 256; key++)
            {
                if (isKeyPressed(key)) 
                    getKeyType(key);
            }
    }
}



private static boolean isKeyPressed(int key)
{
    return User32.INSTANCE.GetAsyncKeyState(key) == -32767;
}



private static void getKeyType(int key)
{

    boolean isDownShift = (User32.INSTANCE.GetKeyState(VK_SHIFT) & 0x80) == 0x80;
    boolean isDownCapsLock = (User32.INSTANCE.GetKeyState(VK_CAPS)) != 0;


    byte[] keystate = new byte[256];
    User32.INSTANCE.GetKeyboardState(keystate); 


    IntByReference keyblayoutID = User32.INSTANCE.GetKeyboardLayout(0);
    int ScanCode  = User32.INSTANCE.MapVirtualKeyExW(key, MAPVK_VK_TO_VSC, keyblayoutID);






    char[] buff = new char[10];

    int bufflen = buff.length;
    int ret = User32.INSTANCE.ToUnicodeEx(key, ScanCode, keystate, buff, bufflen, 0, keyblayoutID);


    switch (ret)
    {
        case -1: 
            System.out.println("Error");
        break;

        case 0:  // no translation

        break;

        default: 
        System.out.println("output=" + String.valueOf(buff).substring(0, ret));
    }




}

它可以正常运行并输出按键，但不适用于Shift + Compinations.我意识到我可以执行”开关”，并将Shift+3转换为”£”，但这不会与不同的键盘一起使用.

推荐答案

我明白了.经过许多小时的搜索，我设法创建了一种将组合转换为当前键盘布局应该的方法.它不涉及死摩托(例如口音)，但它捕获了我需要捕获的所有[SHIFT+Combinations].

要使用它，如下:

getCharacter(int vkCode, boolean shiftKeyPressed);

所以，看这个魔术.如果我想得到SHIFT+3会给我的键盘(£)，我会使用:

getCharacter(KeyEvent.VK_3, true);

这是代码:

public static char getCharacter(int vkCode, boolean shiftKeyPressed)
{

    byte[] keyStates = new byte[256]; //Create a keyboard map of 256 keys

    if (shiftKeyPressed)
    {
        keyStates[16]=-127; //Emulate the shift key being held down
        keyStates[160]=-128; //This needs to be set as well
    }

    IntByReference keyblayoutID = User32.INSTANCE.GetKeyboardLayout(0); //Load local keyboard layout

    int ScanCode  = User32.INSTANCE.MapVirtualKeyExW(vkCode, MAPVK_VK_TO_VSC, keyblayoutID); //Get the scancode

    char[] buff = new char[1];

    int ret = User32.INSTANCE.ToUnicodeEx(vkCode, ScanCode, keyStates, buff, 1, 0, _currentInputLocaleIdentifier);

    switch (ret)
    {
    case -1: //Error
        return (char) -1;

    case 0:  //No Translation
        return (char) 0;

    default: //Returning key...
        return buff[0];
    }
}

这是声明:

final static int MAPVK_VK_TO_VSC = 0;
static IntByReference _currentInputLocaleIdentifier; 

static interface User32 extends Library {

    public static User32 INSTANCE = (User32) Native.loadLibrary("User32", User32.class);


    IntByReference GetKeyboardLayout(int dwLayout);
    int MapVirtualKeyExW (int uCode, int nMapType, IntByReference dwhkl);

    boolean GetKeyboardState(byte[] lpKeyState);

    int ToUnicodeEx(int wVirtKey, int wScanCode, byte[] lpKeyState, char[] pwszBuff, int cchBuff, int wFlags, IntByReference dwhkl);

}

非常感谢Brendanmck，他帮助我找到了这个解决方案.

其他推荐答案

尝试使用 jintellitype 库.它比JNA要简单得多，并且应该能够进行Shift + 键(mod_shift).您唯一可以遇到的问题是检测3，但这很容易解决(例如，键的键盘打印代码).

其他推荐答案

GetKeyboardState有一些问题，但是GetAsyncKeyState似乎正常.

在这里完成从任何窗口读取键盘状态的控制台应用程序的工作示例.
在Windows 7上使用2个非EN-US键盘布局测试.

处理所有内容=)，尤其是Shift+ Compinations
(即Shift+3将转换为当前键盘布局的正确字符)

P.S. David，Thanx的代码示例我最终发现了MapVirtualKeyExW和ToUnicodeEx functions的正确参数:)

P.P.S.该代码在C#中，但我想它可以很容易地移植到Java(因为当我阅读您的代码时，我错误地认为它是C#，并且在问题标题中只有后来注意到了” Java”)

using System;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace KeyboardInputTest
{
    class Program
    {
        static void Main(string[] args)
        {
            new KeyboardTestClass().RunTest();
        }
    }

    public class KeyboardTestClass
    {
        public void RunTest()
        {
            while (true)
            {
                string keyString = string.Empty;
                if (ReadKeyboardInput(ref keyString) && keyString.Length > 0)
                {
                    Console.WriteLine(string.Format("Pressed: {0}", keyString));
                }
                Thread.Sleep(10);
            }
        }

        public bool ReadKeyboardInput(ref string res)
        {
            var hwnd = WinAPI.GetForegroundWindow();
            var pid = WinAPI.GetWindowThreadProcessId(hwnd, IntPtr.Zero);
            var keyboardLayoutHandle = WinAPI.GetKeyboardLayout(pid);

            foreach (var key in (Keys[])Enum.GetValues(typeof(Keys)))
            {
                if (Keyboard.GetAsyncKeyState(key) == -32767)
                {
                    switch (key)
                    {
                        // handle exceptional cases
                        case Keys.Enter:
                        case Keys.LineFeed:
                            res = string.Empty;
                            return false;
                    }
                    res = ConvertVirtualKeyToUnicode(key, keyboardLayoutHandle, Keyboard.ShiftKey);
                    return true;
                }
            }
            return false;
        }

        public string ConvertVirtualKeyToUnicode(Keys key, IntPtr keyboardLayoutHandle, bool shiftPressed)
        {
            var scanCodeEx = Keyboard.MapVirtualKeyExW(key, VirtualKeyMapType.ToVScanCodeEx, keyboardLayoutHandle);
            if (scanCodeEx > 0)
            {
                byte[] lpKeyState = new byte[256];
                if (shiftPressed)
                {
                    lpKeyState[(int)Keys.ShiftKey] = 0x80;
                    lpKeyState[(int)Keys.LShiftKey] = 0x80;
                }
                var sb = new StringBuilder(5);
                var rc = Keyboard.ToUnicodeEx(key, scanCodeEx, lpKeyState, sb, sb.Capacity, 0, keyboardLayoutHandle);
                if (rc > 0)
                {
                    return sb.ToString();
                }
                else
                {
                    // It's a dead key; let's flush out whats stored in the keyboard state.
                    rc = Keyboard.ToUnicodeEx(key, scanCodeEx, lpKeyState, sb, sb.Capacity, 0, keyboardLayoutHandle);
                    return string.Empty;
                }
            }
            return string.Empty;
        }
    }

    // Win API Imports:
    public enum VirtualKeyMapType : int
    {
        ToChar = 2,
        ToVScanCode = 0,
        ToVScanCodeEx = 4
    }
    public static class Keyboard
    {
        public static bool ShiftKey
        {
            get
            {
                return Convert.ToBoolean((int)GetAsyncKeyState(Keys.ShiftKey) & 32768);
            }
        }

        [DllImport("User32.dll")]
        public static extern short GetAsyncKeyState(Keys vKey);

        [DllImport("user32.dll", CharSet = CharSet.Unicode, EntryPoint = "MapVirtualKeyExW", ExactSpelling = true)]
        public static extern uint MapVirtualKeyExW(Keys uCode, VirtualKeyMapType uMapType, IntPtr dwKeyboardLayoutHandle);

        [DllImport("user32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
        public static extern int ToUnicodeEx(Keys wVirtKey, uint wScanCode, byte[] lpKeyState, StringBuilder pwszBuff, int cchBuff, uint wFlags, IntPtr dwKeyboardLayoutHandle);
    }

    public class WinAPI
    {
        [DllImport("user32.dll")]
        public static extern IntPtr GetForegroundWindow();

        [DllImport("user32")]
        public static extern int GetWindowThreadProcessId(IntPtr hwnd, IntPtr lpdwProcessId);

        [DllImport("user32")]
        public static extern IntPtr GetKeyboardLayout(int dwLayout);
    }
}

以上所述是小编给大家介绍的使用JNA（JAVA）获取AsyncKeyState和VirtualKeys/特殊字符,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对77isp云服务器技术网的支持！