Open Source Messenger for Any Version of Windows

Environment: VC6, WIN XP SP1

While I was writing a LAN (Local Area Network) chat program, I noticed that many people on my LAN use different programs for message sending and that not all of them are compatible with other programs. The second problem I noticed was that many of them don't work on Win95/98. So, I decided to add this functionality to my program. I started to search for a universal method for all Windows versions and most message-sending programs and I discovered that the best solution is to add a MAILSLOT mechanism to my program (along with some others). The first place I searched was MSDN and CodeGuru, but I didn't find any complete solution. That's the main reason I wrote this article.

I wrote a function that writes to the mailslot (I saw how to do that on CodeGuru) and a simple class that reads from the mailslot (I found many explanations and put all of them together—mostly from "PJ Naughter"). I also wrote a simple project so you can see how to link these two things and put everything in the right places.

Here are the steps you need to do:

  1. Add "mailslot.h" and "mailslot.cpp" to your project.
  2. Create a CMailSlot instance in your main class (for example, m_serverMailSlot).
  3. Add an OnTimer event to your project and somewhere set the Timer. For example, you can do that in OnInitDialog():
    SetTimer(timerID, 2000, NULL);    //this is for 2 seconds
  4. Create a CheckForNewMessage() function. That is the place where you will be calling an m_serverMailSlot.Read() function.
  5. In the OnTimer() function, call the CheckForNewMessage() function, which will check for new messages and display them (if there are any waiting).

That is all. I know that there are better ways to send messages, but this is the most-used method so you will be able to receive messages from many different programs and to use it on any Windows operating system.

If you have any questions or need some extra help with this, e-mail me... If there are any suggestions or comments, you are most welcome to contact me, too.

You can download "mailslot.h", "mailslot.cpp" (contains CServerMailslot), and "sendfun.txt". You can also download the sample project and executable file.

Downloads

Download executable - 72 Kb
Download demo project - 32 Kb
Download source - 3 Kb


Comments

  • Nice! But one question...

    Posted by Legacy on 03/05/2003 12:00am

    Originally posted by: VaKa

    Your App nice and very helpfull for me in understanding mailslot messaging.
    
    

    But I noticed that if I send a message from one PC to another, second PC receives that message multiple times.
    (in described case one PC running Windows NT4, another - Windows 98)

    Can You help me in understanding that?

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

  • U.S. companies are desperately trying to recruit and hire skilled software engineers and developers, but there is simply not enough quality talent to go around. Tiempo Development is a nearshore software development company. Our headquarters are in AZ, but we are a pioneer and leader in outsourcing to Mexico, based on our three software development centers there. We have a proven process and we are experts at providing our customers with powerful solutions. We transform ideas into reality.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date