MessageBoxManager/MessageBoxManager.cs

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#pragma warning disable 0618
using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Security.Permissions;

[assembly: SecurityPermission(SecurityAction.RequestMinimum, UnmanagedCode = true)]
namespace System.Windows
{
	public class MessageBoxManager
	{
        private delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
        private delegate bool EnumChildProc(IntPtr hWnd, IntPtr lParam);

        private const int WH_CALLWNDPROCRET = 12;
        private const int WM_DESTROY = 0x0002;
        private const int WM_INITDIALOG = 0x0110;
        private const int WM_TIMER = 0x0113;
        private const int WM_USER = 0x400;
        private const int DM_GETDEFID = WM_USER + 0;

        private const int MBOK = 1;
        private const int MBCancel = 2;
        private const int MBAbort = 3;
        private const int MBRetry = 4;
        private const int MBIgnore = 5;
        private const int MBYes = 6;
        private const int MBNo = 7;


		[DllImport("user32.dll")]
        private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

		[DllImport("user32.dll")]
        private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

		[DllImport("user32.dll")]
        private static extern int UnhookWindowsHookEx(IntPtr idHook);
			
		[DllImport("user32.dll")]
        private static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", EntryPoint = "GetWindowTextLengthW", CharSet = CharSet.Unicode)]
        private static extern int GetWindowTextLength(IntPtr hWnd);

        [DllImport("user32.dll", EntryPoint = "GetWindowTextW", CharSet = CharSet.Unicode)]
        private static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int maxLength);

		[DllImport("user32.dll")]
        private static extern int EndDialog(IntPtr hDlg, IntPtr nResult);

        [DllImport("user32.dll")]
        private static extern bool EnumChildWindows(IntPtr hWndParent, EnumChildProc lpEnumFunc, IntPtr lParam);

        [DllImport("user32.dll", EntryPoint = "GetClassNameW", CharSet = CharSet.Unicode)]
        private static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

        [DllImport("user32.dll")]
        private static extern int GetDlgCtrlID(IntPtr hwndCtl);