C# 实现屏幕键盘 (ScreenKeyboard)
原文地址:http://www.cnblogs.com/youzai/archive/2008/05/19/1202732.html
要实现一个屏幕键盘,需要监听所有键盘事件,无论窗体是否被激活。因此需要一个全局的钩子,也就
是系统范围的钩子。
什么是钩子(Hook)
钩子(Hook)是Windows提供的一种消息处理机制平台,是指在程序正常运行中接受信息之前预先
启动的函数,用来检查和修改传给该程序的信息,(钩子)实际上是一个处理消息的程序段,通
过系统调用,把它挂入系统。每当特定的消息发出,在没有到达目的窗口前,钩子程序就先捕获
该消息,亦即钩子函数先得到控制权。这时钩子函数即可以加工处理(改变)该消息,也可以不
作处理而继续传递该消息,还可以强制结束消息的传递。注意:安装钩子函数将会影响系统的性
能。监测“系统范围事件”的系统钩子特别明显。因为系统在处理所有的相关事件时都将调用您的
钩子函数,这样您的系统将会明显的减慢。所以应谨慎使用,用完后立即卸载。还有,由于您可
以预先截获其它进程的消息,所以一旦您的钩子函数出了问题的话必将影响其它的进程。
钩子的作用范围
一共有两种范围(类型)的钩子,局部的和远程的。局部钩子仅钩挂自己进程的事件。远程的钩
子还可以将钩挂其它进程发生的事件。远程的钩子又有两种: 基于线程的钩子将捕获其它进程中
某一特定线程的事件。简言之,就是可以用来观察其它进程中的某一特定线程将发生的事件。 系
统范围的钩子将捕捉系统中所有进程将发生的事件消息。
Hook 类型
Windows共有14种Hooks,每一种类型的Hook可以使应用程序能够监视不同类型的系统消息处理机
制。下面描述所有可以利用的Hook类型的发生时机。详细内容可以查阅MSDN,这里只介绍我们将要
用到的两种类型的钩子。
(1)WH_KEYBOARD_LL Hook
WH_KEYBOARD_LL Hook监视输入到线程消息队列中的键盘消息。
(2)WH_MOUSE_LL Hook
WH_MOUSE_LL Hook监视输入到线程消息队列中的鼠标消息。
下面的 class 把 API 调用封装起来以便调用。
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安装钩子
使用SetWindowsHookEx函数(API函数),指定一个Hook类型、自己的Hook过程是全局还是局部Hook,
同时给出Hook过程的进入点,就可以轻松的安装自己的Hook过程。SetWindowsHookEx总是将你的Hook函
数放置在Hook链的顶端。你可以使用CallNextHookEx函数将系统消息传递给Hook链中的下一个函数。
对于某些类型的Hook,系统将向该类的所有Hook函数发送消息,这时,
Hook函数中的CallNextHookEx语句将被忽略。全局(远程钩子)Hook函数可以拦截系统中所有线程的某
个特定的消息,为了安装一个全局Hook过程,必须在应用程序外建立一个DLL并将该Hook函数封装到其中,
应用程序在安装全局Hook过程时必须先得到该DLL模块的句柄。将Dll名传递给LoadLibrary 函数,就会得
到该DLL模块的句柄;得到该句柄 后,使用GetProcAddress函数可以得到Hook过程的地址。最后,使用
SetWindowsHookEx将 Hook过程的首址嵌入相应的Hook链中,SetWindowsHookEx传递一个模块句柄,它为
Hook过程的进入点,线程标识符置为0,该Hook过程同系统中的所有线程关联。如果是安装局部Hook此时
该Hook函数可以放置在DLL中,也可以放置在应用程序的模块段。在C#中通过平台调用(前文已经介绍过)
来调用API函数。
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使用完钩子后,要进行卸载,这个可以写在析构函数中。
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将这个文件编译成一个dll,即可在应用程序中调用。通过它提供的事件,便可监听所有的键盘事件。
但是,这只能监听键盘事件,没有键盘的情况下,怎么会有键盘事件?其实很简单,通过SendInput
API函数提供虚拟键盘代码的调用即可模拟键盘输入。下面的代码模拟一个 KeyDown 和 KeyUp 过程,
把他们连接起来就是一次按键过程。
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自己实现一个 KeyBoardButton 控件用作按钮,用 Visual Studio 或者 SharpDevelop 为屏幕键盘设计 UI,然后
在这些 Button 的 Click 事件里面模拟一个按键过程。
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其中 combinationVKButtonsMap 是一个 IDictionary<short, IList<KeyboardButton>>, key 存储的是
VK_SHIFT, VK_CONTROL 等组合键的键盘码。左右两个按钮对应同一个键盘码,因此需要放在一个 List 里。
标准键盘上的每一个键都有虚拟键码( VK_CODE)与之对应。还有一些其他的常量,
把它写在一个静态 class 里吧。
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屏幕键盘必须是一个不能获得输入焦点的窗体,在这个窗体的构造函数里,可以安装
一个全局鼠标钩子,再通过调用 SetWindowLong API 函数完成。
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鼠标单击标题栏,让屏幕键盘可以接收焦点,并激活,单击其他部分则不激活窗体(如果激活了,其他程序必然取消激活,
输入就无法进行了),这样才可以进行输入,并且保证了可以拖动窗体到其他位置。
至此,一个屏幕键盘程序差不多完成了,能够实现与实际键盘完全同步。至于窗体,按键重绘,以及 Num Lock, Caps Lock,
Scroll Lock 等键盘灯的模拟,这里就不讲了,如果有兴趣,可以下载完整的代码。最后我们的屏幕键盘程序运行的效果如
下图: