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Context Help Made Easy

, 2 Feb 2007 CPOL
This article introduces a new way of instrumenting your code that enables help authors associate help topics with the application’s visual contexts at any time - even post-compilation – and to do so using the application’s user interface without the involvement of the developer.
using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace ContextHelpMadeEasy
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            //add message filter
            MessageFilter oFilter = new MessageFilter();
            System.Windows.Forms.Application.AddMessageFilter((IMessageFilter)oFilter);

            Application.Run(new FTestApplication());
        }
    }

    internal class MessageFilter : IMessageFilter
    {
        bool IMessageFilter.PreFilterMessage(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x100: //MSG.WM_KEYDOWN
                    if ((int)m.WParam == (int)Keys.F1)
                    {
                        // Call the help handler.
                        HelpUtility.ProcessHelpRequest(Control.FromHandle(m.HWnd));
                        return true;
                    }
                    break;
            }
            return false;
        }
    }
}

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License

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

Tom Clement
Product Manager
United States United States
I've been programming in C, C++, Visual Basic and C# for almost 30 years. I've worked at Sierra Systems, ViewStar, Mosaix, Lucent, Avaya, Avinon, Apptero, Serena and now Guidewire Software in various roles over my career.

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