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目前的程序中想要添加Hook，截獲鍵盤按鍵消息，所以上網(wǎng)找了一下關(guān)于C# Hook的東西。發(fā)現(xiàn)很多人都在說在添加C# Hook不成功和不穩(wěn)定，而建議使用C++封一個(gè)Dll給C#使用?？上驳氖亲詈笪疫€是成功的在程序中使用C#添加了Hook，經(jīng)過測(cè)試還是沒有什么問題的。
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進(jìn)行Hook需要使用三個(gè)API函數(shù)
SetWindowsHookEx 進(jìn)行Hook的注冊(cè)
UnhookWindowsHookEx 取消已經(jīng)注冊(cè)的Hook
CallNextHookEx 將消息傳遞給下一個(gè)Hook函數(shù)
看一下定義
- [DllImport("user32.dll")]
- private static extern IntPtr SetWindowsHookEx(
- HookType code, HookProc func, IntPtr instance, int threadID);
- [DllImport("user32.dll")]
- private static extern int UnhookWindowsHookEx(IntPtr hook);
- [DllImport("user32.dll")]
- private static extern int CallNextHookEx(
- IntPtr hook, int code, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);
我們需要定義一個(gè)delegate來接收消息
- private delegate int HookProc(int code, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);
定義兩個(gè)event提供給外界使用
- public delegate void HookEventHandler(object sender, HookEventArgs e);
- public event HookEventHandler KeyDown;
- public event HookEventHandler KeyUp;
因?yàn)橐邮盏氖擎I盤的消息所以要定義一些消息，和我們要接收的結(jié)構(gòu)。
- public class HookEventArgs : EventArgs
- {
- // using Windows.Forms.Keys instead of Input.Key since the Forms.Keys maps
- // to the Win32 KBDLLHOOKSTRUCT virtual key member, where Input.Key does not
- public Keys Key;
- public bool Alt;
- public bool Control;
- public bool Shift;
- public HookEventArgs(UInt32 keyCode)
- {
- // detect what modifier keys are pressed, using
- // Windows.Forms.Control.ModifierKeys instead of Keyboard.Modifiers
- // since Keyboard.Modifiers does not correctly get the state of the
- // modifier keys when the application does not have focus
- this.Key = (Keys)keyCode;
- this.Alt = (System.Windows.Forms.Control.ModifierKeys & Keys.Alt) != 0;
- this.Control = (System.Windows.Forms.Control.ModifierKeys & Keys.Control) != 0;
- this.Shift = (System.Windows.Forms.Control.ModifierKeys & Keys.Shift) != 0;
- }
- }
- private enum HookType : int
- {
- WH_JOURNALRECORD = 0,
- WH_JOURNALPLAYBACK = 1,
- WH_KEYBOARD = 2,
- WH_GETMESSAGE = 3,
- WH_CALLWNDPROC = 4,
- WH_CBT = 5,
- WH_SYSMSGFILTER = 6,
- WH_MOUSE = 7,
- WH_HARDWARE = 8,
- WH_DEBUG = 9,
- WH_SHELL = 10,
- WH_FOREGROUNDIDLE = 11,
- WH_CALLWNDPROCRET = 12,
- WH_KEYBOARD_LL = 13,
- WH_MOUSE_LL = 14
- }
- public struct KBDLLHOOKSTRUCT
- {
- public UInt32 vkCode;
- public UInt32 scanCode;
- public UInt32 flags;
- public UInt32 time;
- public IntPtr extraInfo;
- }
關(guān)鍵的在這里注冊(cè)C# Hook
- private void Install()
- {
- if (_hookHandle != IntPtr.Zero)
- return;
- Module[] list = System.Reflection.Assembly.GetExecutingAssembly().GetModules();
- System.Diagnostics.Debug.Assert(list != null && list.Length > 0);
- _hookHandle = SetWindowsHookEx(_hookType,
- _hookFunction, Marshal.GetHINSTANCE(list[0]), 0);
- }
哦，還有HookType _hookType = HookType.WH_KEYBOARD_LL; 因?yàn)橐孬@鍵盤消息
還有_hookFunction = new HookProc(HookCallback);
其實(shí)最關(guān)鍵的是Marshal.GetHINSTANCE(list[0])得到當(dāng)前程序的instance，這樣這個(gè)C# Hook就是全局的C# Hook，這個(gè)位置也可以是null，這樣就不是全局C# Hook。
有個(gè)很奇怪的現(xiàn)象就是這個(gè)函數(shù)，在調(diào)試狀態(tài)執(zhí)行不能成功，而做成Release以后運(yùn)行成功，所以你在做程序時(shí)，不要因?yàn)檎{(diào)試失敗而對(duì)這個(gè)函數(shù)有懷疑，編一個(gè)Release版本的程序，獨(dú)立運(yùn)行再試一下。我使用的環(huán)境是VS2005 + Vista。
接收消息的函數(shù)
- private int HookCallback(int code, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam)
- {
- if (code < 0)
- return CallNextHookEx(_hookHandle, code, wParam, ref lParam);
- if ((lParam.flags & 0x80) != 0 && this.KeyUp != null)
- this.KeyUp(this, new HookEventArgs(lParam.vkCode));
- if ((lParam.flags & 0x80) == 0 && this.KeyDown != null)
- {
- this.KeyDown(this, new HookEventArgs(lParam.vkCode));
- if (lParam.vkCode == 44)
- {
- return 1;
- }
- }
- return CallNextHookEx(_hookHandle, code, wParam, ref lParam);
- }
這里會(huì)區(qū)分KeyUp和KeyDown，注意一定要調(diào)用CallNextHookEx，這樣會(huì)將這個(gè)消息在系統(tǒng)中繼續(xù)傳遞，這很重要。除非你想阻止這個(gè)消息，也不希望其他程序再處理這個(gè)消息。
下面最后的操作，釋放注冊(cè)。
- private void Uninstall()
- {
- if (_hookHandle != IntPtr.Zero)
- {
- UnhookWindowsHookEx(_hookHandle);
- _hookHandle = IntPtr.Zero;
- }
- }
Ok，完成了。
名稱欄目：看看C#Hook如何實(shí)現(xiàn)
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