使用当前键盘布局截取键盘输入 [英] Intercept keyboard input using current keyboard layout

问题描述

我已经使用SetWindowsHookEx()函数实现了低级键盘挂钩.它可以正常工作，并为每个击键返回一个虚拟键代码.我可以使用KeyInterop.KeyFromVirtualKey()将此虚拟键代码转换为System.Windows.Input.Key.但是目标是在当前键盘布局中获得与此虚拟按键代码相对应的符号.

I've implemented a low-level keyboard hook using SetWindowsHookEx() function. It works fine and returns a virtual key code for each keystroke. I can convert this virtual key code to a System.Windows.Input.Key using KeyInterop.KeyFromVirtualKey(). But the target is to get a symbol that corresponds to this virtual key code in current keyboard layout.

即对于德国布局，我想为Key.Z获得"Y"，为Key.Y获得"Z".

I.e. for German layout I want to get "Y" for Key.Z, "Z" for Key.Y.

有人可以帮忙吗?

谢谢.

推荐答案

不太确定我们是否在谈论同一场景，但是我最近遇到了类似的问题，其中ToUnicodeEx中断了用户的按键(使用'alt + numpad之类的修饰符时'或德文键盘上的'+'键修饰符)，从而导致意外的字母被打印到屏幕上(如果需要的话).

Not quite sure we're talking about same scenario, but I recently encountered similar problem where ToUnicodeEx interrupted users' key strokes (when using modifiers like 'alt+numpad' or on German keyboard the '+' key modifier), causing unexpected letters to be printed into screen instead if the desired ones.

通过在运行ToUnicodeEx之前将@Nejchy的代码与ClearKeyboardBuffer方法结合起来解决了我的问题:

Solved my problem by combining @Nejchy's code with ClearKeyboardBuffer method right before running ToUnicodeEx:

private static bool ClearKeyboardBuffer(uint vk, uint sc, IntPtr hkl)
{
    StringBuilder sb = new StringBuilder(10);
    int rc = -1;
    bool isDeadKey = false;
    while (rc < 0)
    {
        rc = user32.ToUnicodeEx(vk, sc, new byte[256], sb, sb.Capacity, 0, hkl);
        if (!isDeadKey && rc == -1) isDeadKey = true;
        Console.Write(rc);
    }
    return isDeadKey;
}

在执行"ToUnicodeEx"的代码中:

In your code that does 'ToUnicodeEx':

var isDeadKey = ClearKeyboardBuffer((uint)aKey, 0, hKd);
if (isDeadKey) return;
user32.ToUnicodeEx((uint)aKey, vkCode, keyboardState, characters, 10, (uint)0, hKd);

参考: http://www.siao2.com/2006/03/23/558658. aspx http://www.siao2.com/2006/04/06/569632. aspx

还要看一下他的代码: https://stackoverflow.com/a/8705696/802848

Also look at his code: https://stackoverflow.com/a/8705696/802848

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