不在焦点时响应键盘?(C#，Vista) [英] Respond to keyboard when not in focus? (C#, Vista)

问题描述

我正在尝试编写一个应用程序，无论当前哪个应用程序具有焦点，只要按下 Shift 键就会响应.

I'm trying to write an application that responds whenever the Shift key is pressed, no matter what application currently has focus.

我用 SetWindowsHookEx() 和 GetKeyboardState() 尝试了这个，但是这两种方法只在应用程序的窗口有焦点时才有效.我需要它在全球范围内工作.

I tried this with SetWindowsHookEx() and with GetKeyboardState(), but both of these only work when the application's window has focus. I need it to work globally.

我该怎么做?

推荐答案

提供的答案都没有帮助我解决我的问题，但我自己找到了答案.在这里.

None of the provided answers helped me solve my problem, but I found the answer myself. Here it is.

使用 SetWindowsHookEx() 和 WH_KEYBOARD_LL 是正确的方法.但是，SetWindowsHookEx() 的其他参数不直观:

Using SetWindowsHookEx() with WH_KEYBOARD_LL was the correct approach. However, the other parameters to SetWindowsHookEx() are unintuitive:

• 最后一个参数 dwThreadId 需要为 0.
• 倒数第二个参数 hMod 需要指向某个 DLL.我用了User32，它是一个 DLL，无论如何总是被加载并被所有人使用使用 GUI 处理.我从 一篇关于此的 CodeProject 帖子 中得到了这个想法.

• The last parameter, dwThreadId, needs to be 0.
• The second-last parameter, hMod, needs to point to some DLL. I used User32, which is a DLL that is always loaded anyway and is used by all processes with a GUI. I got this idea from a CodeProject post about this.

因此，代码看起来有点像这样:

Thus, the code looks a bit like this:

instance = LoadLibrary("User32");
hhook = SetWindowsHookEx(WH_KEYBOARD_LL, hookFunction, instance, 0);

文档不清楚倒数第二个参数.它说:

The documentation is unclear about the second-last parameter. It says:

如果挂钩过程在与当前进程关联的代码中，则 hMod 参数必须设置为 NULL [...].

The hMod parameter must be set to NULL [...] if the hook procedure is within the code associated with the current process.

它没有说明这仅适用于某些类型的钩子，而不适用于 WH_KEYBOARD_LL 和 WH_MOUSE_LL.

It doesn't state that this only applies to some types of hooks, but not to WH_KEYBOARD_LL and WH_MOUSE_LL.

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