捕捉消息框中的文字

把桌面上弹出的消息框中的文字取出来

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();
            }
        }
    }
}