问题描述

有没有办法在 windows 设备的屏幕上(应用程序框架外)捕获触摸输入?

Is there any way to capture touch input on the screen (outside application frame) in windows device?

我正在开发 WPF 应用程序，如果触摸输入仅出现在应用程序框架内，我可以检索它.另外，有没有办法在应用最小化的情况下注册触摸输入?

I'm working on a WPF application and can retrieve the touch input if it only occurs within the application frame. Also, is there a way to register the touch input even when the application is minimized?

推荐答案

WPF 框架没有内置方法可以让您在应用程序之外侦听输入.如果你想这样做，你必须进入 p/invoke 领域.

There's no built-in method of the WPF framework that lets you listen for input outside of the application. If you want to do that, you'll have to get into p/invoke territory.

具体来说，您需要创建一个 hook.您需要查看 SetWindowsHookEx 方法和 WH_MOUSE 或 WH_MOUSE_LL 钩子.

Specifically you'll need to create a hook. You'll want to look at the SetWindowsHookEx method and either the WH_MOUSE or WH_MOUSE_LL hooks.

由于您正在处理触摸输入，此答案可能对您有一些有用的信息:

Since you're dealing with touch inputs, this answer might have some useful information for you:

hookProc 回调的 lParam 参数是一个指向 MSLLHOOKSTRUCT.它包含一个 very 记录不佳的 dwExtraInfo 变量，它告诉您它是否是通过触摸生成的.

The lParam argument of your hookProc callback is a pointer to an MSLLHOOKSTRUCT. It contains a very poorly documented dwExtraInfo variable, which tells you whether it was generated from a touch.

如果 0xFF515700 中的所有位都在 dwExtraInfo 中设置，则调用回调以响应触摸.

If all of the bits in 0xFF515700 are set in dwExtraInfo, then the callback was invoked in response to a touch.

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