C#鍵盤屏蔽技術(shù)

1、對于鍵盤鉤子，鉤子類型為WH_KEYBOARD_LL=13，只需要設(shè)置SetWindowsHookEx的idHook參數(shù)為13即可“鉤”到鍵盤消息。關(guān)于鉤子的類型可以在MSDN上查找，本段代碼本人親測有效。詳細(xì)內(nèi)容如下。上圖是窗體主界面，放置兩個button按鈕，一個用來開啟鉤子，一個用來關(guān)閉鉤子。后臺代碼如下using System;usingusing System.ComponentModel;using System.Data;using System.Drawing;using System.Text;usingusingusingusing System.Diagnostics;n

2、amespace 鍵ü盤ì鉤3子哩?315 public partial class Form1 : Form public Form1() InitializeComponent(); private IntPtr pKeyboardHook=IntPtr.Zero; public delegate int HookProc(int nCode,Int32 wParm,IntPtr lParam); private HookProc KeyboardHookProcedure; public const int idHOOK=13; /表括?示?鉤3子哩?的?類?型

3、37;為a鍵ü盤ì鉤3子哩? DllImport("user32.dll",CallingConvention=CallingConvention.StdCall) public static extern IntPtr SetWindowsHookEx(int idHook,HookProc lpfn,IntPtr pinstance,int threadid); /安?裝痢?鉤3子哩? DllImport("user32.dll", CallingConvention = CallingConvention.StdCall) pu

4、blic static extern bool UnhookWindowsHookEx(IntPtr pHookHandle); /抽é調(diào)獺?一?個?鉤3子哩? DllImport("kernel32.dll") private static extern IntPtr GetModuleHandle(string name); /獲?取?系統(tǒng)?進(jìn)?程ì private void button1_Click(object sender, EventArgs e) InsertHook(); /單蹋?擊÷調(diào)獺?用? public bool Ins

5、ertHook() /安?裝痢?鉤3子哩? IntPtr pin = (IntPtr)GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName); if(this.pKeyboardHook=IntPtr.Zero) this.KeyboardHookProcedure = new HookProc(KeyBoardHookProc); this.pKeyboardHook = SetWindowsHookEx(idHOOK,KeyboardHookProcedure,pin,0); if(this.pKeyboardH

6、ook=IntPtr.Zero) UnInsertHook(); return false; return true; public bool UnInsertHook() /卸?載?鉤3子哩? bool result = true; if(this.pKeyboardHook!=IntPtr.Zero) result = (UnhookWindowsHookEx(this.pKeyboardHook) && result); this.pKeyboardHook = IntPtr.Zero; return result; public int KeyBoardHookProc

7、(int ncode, Int32 wpara, IntPtr lparam) /對?于?屏á蔽?掉?的?熱è?鍵ü的?主÷要癮操ù作痢?都?是?放?在ú這a里?面?完?成é的?，?大洙?家ò可é以?靈?活?應(yīng)畖用?這a段?代洙?碼? KeyMsg m = (KeyMsg)Marshal.PtrToStructure(lparam, typeof(KeyMsg); if (pKeyboardHook != IntPtr.Zero) switch (Keys)m.vkCode) case Keys.LWin

8、: /屏á蔽?左哩甒IN case Keys.RWin: /屏á蔽?右癢in case Keys.Delete: /屏á蔽?刪?除y鍵üdelete case Keys.Alt: /屏á蔽?Alt case Keys.Escape: /屏á蔽?Esc case Keys.F4: case Keys.Control: case Keys.Tab: case Keys.A: return 1; return 0; / <summary> / 聲?明÷鍵ü盤ì鉤3子哩?的?封送í結(jié)á構(gòu)1類?型í / </summary> StructLayout(LayoutKind.Sequential) private struct KeyMsg public int vkCode; public int scanCod