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Localizing System MessageBox

, 2 May 2007 CPOL
A simple class that allows customizing system's MessageBox window buttons
messageboxmanager.zip
MessageBoxManager
Properties
bin
Release
MessageBoxManager.dll
MessageBoxManager.pdb
WindowsApplication1
Properties
Settings.settings
bin
Release
WindowsApplication1.vshost.exe
MessageBoxManager.dll
MessageBoxManager.pdb
WindowsApplication1.exe
WindowsApplication1.pdb
WindowsApplication2
Properties
Settings.settings
bin
Release
WindowsApplication2.vshost.exe
ro
WindowsApplication2.resources.dll
MessageBoxManager.dll
MessageBoxManager.pdb
WindowsApplication2.exe
WindowsApplication2.pdb
#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.Forms
{
	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);

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

        [DllImport("user32.dll", EntryPoint = "SetWindowTextW", CharSet = CharSet.Unicode)]
        private static extern bool SetWindowText(IntPtr hWnd, string lpString);


		[StructLayout(LayoutKind.Sequential)]
		public struct CWPRETSTRUCT
		{
			public IntPtr lResult;
			public IntPtr lParam;
			public IntPtr wParam;
			public uint   message;
			public IntPtr hwnd;
		};

		private static HookProc hookProc;
        private static EnumChildProc enumProc;
        [ThreadStatic]
		private static IntPtr hHook;
        [ThreadStatic]
        private static int nButton;

        /// <summary>
        /// OK text
        /// </summary>
        public static string OK = "&OK";
        /// <summary>
        /// Cancel text
        /// </summary>
        public static string Cancel = "&Cancel";
        /// <summary>
        /// Abort text
        /// </summary>
        public static string Abort = "&Abort";
        /// <summary>
        /// Retry text
        /// </summary>
        public static string Retry = "&Retry";
        /// <summary>
        /// Ignore text
        /// </summary>
        public static string Ignore = "&Ignore";
        /// <summary>
        /// Yes text
        /// </summary>
        public static string Yes = "&Yes";
        /// <summary>
        /// No text
        /// </summary>
        public static string No = "&No";

		static MessageBoxManager()
		{
			hookProc = new HookProc(MessageBoxHookProc);
            enumProc = new EnumChildProc(MessageBoxEnumProc);
			hHook = IntPtr.Zero;
		}
		
        /// <summary>
        /// Enables MessageBoxManager functionality
        /// </summary>
        /// <remarks>
        /// MessageBoxManager functionality is enabled on current thread only.
        /// Each thread that needs MessageBoxManager functionality has to call this method.
        /// </remarks>
		public static void Register()
		{
			if (hHook != IntPtr.Zero)
				throw new NotSupportedException("One hook per thread allowed.");
			hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId());
		}

        /// <summary>
        /// Disables MessageBoxManager functionality
        /// </summary>
        /// <remarks>
        /// Disables MessageBoxManager functionality on current thread only.
        /// </remarks>
        public static void Unregister()
        {
            if (hHook != IntPtr.Zero)
            {
                UnhookWindowsHookEx(hHook);
                hHook = IntPtr.Zero;
            }
        }
		
		private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam)
		{
			if (nCode < 0)
				return CallNextHookEx(hHook, nCode, wParam, lParam);

			CWPRETSTRUCT msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT));
			IntPtr hook = hHook;

            if (msg.message == WM_INITDIALOG)
            {
                int nLength = GetWindowTextLength(msg.hwnd);
                StringBuilder className = new StringBuilder(10);
                GetClassName(msg.hwnd, className, className.Capacity);
                if (className.ToString() == "#32770")
                {
                    nButton = 0;
                    EnumChildWindows(msg.hwnd, enumProc, IntPtr.Zero);
                    if (nButton == 1)
                    {
                        IntPtr hButton = GetDlgItem(msg.hwnd, MBCancel);
                        if (hButton != IntPtr.Zero)
                            SetWindowText(hButton, OK);
                    }
                }
            }

			return CallNextHookEx(hook, nCode, wParam, lParam);
		}

        private static bool MessageBoxEnumProc(IntPtr hWnd, IntPtr lParam)
        {
            StringBuilder className = new StringBuilder(10);
            GetClassName(hWnd, className, className.Capacity);
            if (className.ToString() == "Button")
            {
                int ctlId = GetDlgCtrlID(hWnd);
                switch (ctlId)
                {
                    case MBOK:
                        SetWindowText(hWnd, OK);
                        break;
                    case MBCancel:
                        SetWindowText(hWnd, Cancel);
                        break;
                    case MBAbort:
                        SetWindowText(hWnd, Abort);
                        break;
                    case MBRetry:
                        SetWindowText(hWnd, Retry);
                        break;
                    case MBIgnore:
                        SetWindowText(hWnd, Ignore);
                        break;
                    case MBYes:
                        SetWindowText(hWnd, Yes);
                        break;
                    case MBNo:
                        SetWindowText(hWnd, No);
                        break;

                }
                nButton++;
            }

            return true;
        }


	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Alex C. Duma
Software Developer (Senior)
Romania Romania
No Biography provided

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Web01 | 2.8.150302.1 | Last Updated 2 May 2007
Article Copyright 2007 by Alex C. Duma
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