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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Reflection;using System.Xml;using System.Runtime.InteropServices;namespace WindowsApplication26...{  public partial class Form1 : Form  ...{    public class HookMsg    ...{      Win32 API functions#region Win32 API functions      private const int WH_CBT = 0x5;      private const int IDC_OK = 0x1;      private const int IDC_Text = 0xFFFF;      [DllImport（"user32.dll"）]      protected static extern IntPtr SetWindowsHookEx（int code, HookProc func, IntPtr hInstance, int threadID）;      [DllImport（"user32.dll"）]      protected static extern int UnhookWindowsHookEx（IntPtr hhook）;      [DllImport（"user32.dll"）]      protected static extern int CallNextHookEx（IntPtr hhook, int code, IntPtr wParam, IntPtr lParam）;      [DllImport（"user32.dll"）]      protected static extern int GetWindowText（IntPtr hwnd, [Out]StringBuilder lpString, int nMaxCount）;      [DllImport（"user32.dll"）]      protected static extern int GetClassName（IntPtr hwnd, [Out]StringBuilder lpString, int nMaxCount）;      [DllImport（"user32.dll"）]      protected static extern int SetWindowText（IntPtr hWnd, string lpString）;      [DllImport（"user32.dll"）]      protected static extern IntPtr GetDlgItem（IntPtr hwnd, int id）;      [DllImport（"User32"）]      protected static extern int SetDlgItemText（IntPtr hDlg, int nIDDlgItem, string lpString）;      [DllImport（"user32.dll"）]      protected static extern int GetDlgItemText（IntPtr hDlg, int nIDDlgItem, [Out] StringBuilder lpString, int nMaxCount）;      [DllImport（"user32.dll", EntryPoint = "MessageBox"）]      protected static extern int _MessageBox（IntPtr hwnd, string text, string caption,        int options）;      [DllImport（"user32.dll"）]      protected static extern IntPtr GetActiveWindow（）;      [DllImport（"user32.dll"）]      protected static extern void DestroyWindow（IntPtr hwnd）;      #endregion      private static System.IntPtr m_hhook;      public delegate int HookProc（int code, IntPtr wParam, IntPtr lParam）;      protected static HookProc m_filterFunc;      static HookMsg（）      ...{        if （m_filterFunc == null）          m_filterFunc = new HookProc（CoreHookProc）;      }      public static void Install（）      ...{        m_hhook = SetWindowsHookEx（WH_CBT, m_filterFunc, IntPtr.Zero, AppDomain.GetCurrentThreadId（））;      }      public static void Uninstall（）      ...{        UnhookWindowsHookEx（m_hhook）;      }      //CallBack      protected static int CoreHookProc（int code, IntPtr wParam, IntPtr lParam）      ...{        if （code == 5）        ...{          StringBuilder sb = new StringBuilder（）;          sb.Capacity = 255;          //Title          GetWindowText（wParam, sb, 255）;          string strTitle = "jinjazz看到了:" + sb.ToString（）;          //Text          GetDlgItemText（wParam, IDC_Text, sb, 255）;          string strText = "jinjazz看到了:" + sb.ToString（）;          //获取按钮          int style = 0;          for （int i = 0; i <= 5; i++）          ...{            if （GetDlgItem（wParam, i） ！= IntPtr.Zero）              style += i;          }          SetDlgItemText（wParam, IDC_Text, strText）;          SetWindowText（wParam, strTitle）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.No）, "jinjazzOK"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.Cancel）, "jinjazzCancel"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.Abort）, "jinjazzAbort"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.Ignore）, "jinjazzIgnore"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.None）, "jinjazzNone"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.OK）, "jinjazzOK"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.Retry）, "jinjazzRetry"）;          SetWindowText（GetDlgItem（wParam, （int）DialogResult.Yes）, "jinjazzYes"）;        }        //  return CallNextHookEx（this.m_hhook, code, wParam, lParam）;        return 0;      }    }    public Form1（）    ...{      InitializeComponent（）;    }    private void Form1_Load（object sender, EventArgs e）    ...{    }    private void button1_Click（object sender, EventArgs e）    ...{      MessageBox.Show（this,"确定按钮                  ","标题"）;    }    private void button2_Click（object sender, EventArgs e）    ...{      MessageBox.Show（this, "确定按钮                  ", "标题", MessageBoxButtons.YesNoCancel）;    }    private void button3_Click（object sender, EventArgs e）    ...{      MessageBox.Show（this, "确定按钮                  ", "标题", MessageBoxButtons.AbortRetryIgnore）;    }    private void checkBox1_CheckedChanged（object sender, EventArgs e）    ...{      if （this.checkBox1.Checked）      ...{        HookMsg.Install（）;      }      else      ...{        HookMsg.Uninstall（）;      }    }  }}