使用低级键盘钩子更改键盘字符

发布于 2024-08-17 15:24:40 字数 1066 浏览 14 评论 0原文

我正在创建自定义键盘布局。作为开始步骤，我想让用户按下一个键，让我的键盘钩子拦截它，并输出我选择的不同键。

我找到了这个键盘挂钩代码，我试图根据我的目的对其进行稍微修改： http://blogs.msdn.com/toub/archive/ 2006/05/03/589423.aspx

我已经将相关方法更改为：

private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
    {
        KBDLLHOOKSTRUCT replacementKey = new KBDLLHOOKSTRUCT();
        Marshal.PtrToStructure(lParam, replacementKey);
        replacementKey.vkCode = 90; // char 'Z'
        Marshal.StructureToPtr(replacementKey, lParam, true);
    }
    return CallNextHookEx(_hookID, nCode, wParam, lParam);
}

我希望它声明一个新的KBD结构对象，将键盘钩子提供的KBD结构复制到其中，修改我的对象的vkCode使用不同的字符，然后用我的修改版本覆盖提供的对象。除了写出不同的字符之外，这应该会保持一切相同。

不幸的是，它不起作用。输入原始键盘字符。 Visual Studio 输出窗格还会出现A first opportunity exception of type 'System.ArgumentException' returned in MirrorBoard.exe 错误。

我可以在这里做什么来拦截键盘挂钩并将其替换为我选择的字符？

谢谢！

原文

I'm creating a custom keyboard layout. As the beginning step, I want to have the user press a key, have my keyboard hook intercept it, and output a different key of my choosing.

I found this keyboard hook code, which I'm trying to slightly modify for my purposes:
http://blogs.msdn.com/toub/archive/2006/05/03/589423.aspx

I've changed the relevant method to this:

private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
    {
        KBDLLHOOKSTRUCT replacementKey = new KBDLLHOOKSTRUCT();
        Marshal.PtrToStructure(lParam, replacementKey);
        replacementKey.vkCode = 90; // char 'Z'
        Marshal.StructureToPtr(replacementKey, lParam, true);
    }
    return CallNextHookEx(_hookID, nCode, wParam, lParam);
}

I want it to declare a new KBD structure object, copy the KBD structure supplied by the keyboard hook into it, modify my object's vkCode to use a different character, and then overwrite the supplied object with my modified version. This should hopefully keep everything the same except for the fact that it writes a different character.

Unfortunately, it's not working. The original keyboard character is typed. The Visual Studio output pane also gets a A first chance exception of type 'System.ArgumentException' occurred in MirrorBoard.exe error.

What can I do here to intercept the keyboard hook and replace it with a character of my choosing?

Thanks!

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温馨耳语 2024-08-24 15:24:40

Marshal.PtrToStructure 的第二个参数必须是类而不是结构，并且 KBDLLHOOKSTRUCT 可能是结构。

相反，你应该像这样使用它：

KBDLLHOOKSTRUCT replacementKey = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));
replacementKey.vkCode = 90; // char 'Z'
Marshal.StructureToPtr(replacementKey, lParam, false);

The second parameter for Marshal.PtrToStructure must be a class not a struct and KBDLLHOOKSTRUCT is probably a struct.

Instead you should use it like this:

KBDLLHOOKSTRUCT replacementKey = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));
replacementKey.vkCode = 90; // char 'Z'
Marshal.StructureToPtr(replacementKey, lParam, false);

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