Articles by Len Holgate (Articles: 22)

Articles: 22

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Average article rating: 4.52

Desktop Programming
ATL	COM: IEnumXXXX to STL-style iterator wrapper class 24 Feb 2000 Updated: 24 Feb 2000 Rating: 5.00/5 Votes: 1 Popularity: 0.00 Licence: CPOL Views: 56,962 Bookmarked: 37 Downloaded: 918 Please Sign up or sign in to vote. A simplified method to enumerate a collection of objects.
MFC	Include/Exclude List Boxes 25 Feb 2000 Updated: 25 Feb 2000 Rating: 4.50/5 Votes: 5 Popularity: 3.15 Licence: CPOL Views: 121,231 Bookmarked: 47 Downloaded: 2,223 Please Sign up or sign in to vote. How to package lots of standard functionality into a CListBox derived class.
	A Task Tray Applet Framework 24 Feb 2000 Updated: 24 Feb 2000 Rating: 4.78/5 Votes: 3 Popularity: 2.28 Licence: CPOL Views: 156,593 Bookmarked: 53 Downloaded: 1,139 Please Sign up or sign in to vote. A framework for system tray applets
	Making ATL OLE DB Provider templates support updating of data - Part 1 20 Feb 2000 Updated: 20 Feb 2000 Rating: 4.33/5 Votes: 2 Popularity: 1.30 Licence: CPOL Views: 65,030 Bookmarked: 32 Downloaded: 778 Please Sign up or sign in to vote. The ATL OLE DB Provider templates only seem to support read-only rowsets and making them support updating of data isn't as easy as you'd expect!
	Making ATL OLE DB Provider templates support updating of data - Part 2 20 Feb 2000 Updated: 20 Feb 2000 Rating: 0.00/5 Votes: 0 Popularity: 0.00 Licence: CPOL Views: 61,371 Bookmarked: 26 Downloaded: 599 Please Sign up or sign in to vote. The ATL OLE DB Provider templates only seem to support read-only rowsets and making them support updating of data isn't as easy as you'd expect!
	Exposing tabular data from your COM object - Part 1 20 Feb 2000 Updated: 28 Jul 2000 Rating: 4.17/5 Votes: 3 Popularity: 1.99 Licence: CPOL Views: 98,060 Bookmarked: 35 Downloaded: 1,768 Please Sign up or sign in to vote. ADO seems to be the ideal way to expose tabular data from your own COM objects and the ATL OLE DB Provider templates can help!
	Exposing tabular data from your COM object - Part 2 20 Feb 2000 Updated: 28 Jul 2000 Rating: 5.00/5 Votes: 7 Popularity: 4.23 Licence: CPOL Views: 92,336 Bookmarked: 33 Downloaded: 1,068 Please Sign up or sign in to vote. The ATL OLE DB Provider templates appear to rely on the fact that your data is kept in a simple array, but that's not really the case at all!
	Exposing tabular data from your COM object - Part 3 20 Feb 2000 Updated: 28 Jul 2000 Rating: 5.00/5 Votes: 2 Popularity: 1.51 Licence: CPOL Views: 65,875 Bookmarked: 28 Downloaded: 1,249 Please Sign up or sign in to vote. Adding bookmark functionality is relatively easy and it enables our ADO recordset to be used with a greater number of data bound controls.
	Templates and MFC 27 Feb 2000 Updated: 27 Feb 2000 Rating: 4.65/5 Votes: 12 Popularity: 4.84 Licence: CPOL Views: 171,337 Bookmarked: 52 Downloaded: 2,406 Please Sign up or sign in to vote. Templates are a great way of reusing code, unfortunately MFC makes it hard to write MFC friendly template classes...
	Component Category Manager wrapper classes 24 Feb 2000 Updated: 24 Feb 2000 Rating: 4.20/5 Votes: 2 Popularity: 1.26 Licence: CPOL Views: 94,741 Bookmarked: 42 Downloaded: 1,561 Please Sign up or sign in to vote. COM objects can be categorised using the Component Category Manager. The code here makes it easier to use these categories in your code.
	Writing extensible applications 25 Feb 2000 Updated: 25 Feb 2000 Rating: 4.09/5 Votes: 8 Popularity: 3.69 Licence: CPOL Views: 100,353 Bookmarked: 54 Downloaded: 0 Please Sign up or sign in to vote. Using simple in-process COM objects you can make an application easy to extend without the need for recompilation of the main app.
	Sinking connection points in C++ objects 5 Jun 2002 Updated: 5 Jun 2002 Rating: 1.80/5 Votes: 2 Popularity: 0.54 Licence: CPOL Views: 129,203 Bookmarked: 44 Downloaded: 1,230 Please Sign up or sign in to vote. Sometimes it would be nice to be able to use a simple C++ object as a sink for Connection Point notifications. This article shows you how.
	Control Panel Applet Framework 24 Feb 2000 Updated: 24 Feb 2000 Rating: 4.76/5 Votes: 10 Popularity: 4.76 Licence: CPOL Views: 101,483 Bookmarked: 50 Downloaded: 1,556 Please Sign up or sign in to vote. A mini framework for writing Control Panel applets. Just fill in the blanks!.
	Registry API Wrapper 24 Feb 2000 Updated: 24 Feb 2000 Rating: 4.92/5 Votes: 9 Popularity: 4.70 Licence: CPOL Views: 211,592 Bookmarked: 57 Downloaded: 3,755 Please Sign up or sign in to vote. The Win32 Registry API is far too complex for simple tasks, and all the error checking gets in the way of the real work...
	A Reusable, High Performance, Socket Server Class - Part 3 2 Jun 2002 Updated: 18 Jul 2002 Rating: 4.84/5 Votes: 22 Popularity: 6.40 Licence: CPOL Views: 586,504 Bookmarked: 137 Downloaded: 10,662 Please Sign up or sign in to vote. When a server has to deal with lots of short lived client connections, it's advisable to use the Microsoft extension function for WinSock, AcceptEx(), to accept connections.
	Handling Multiple Pending Socket Read and Write Operations 20 Jul 2002 Updated: 17 Aug 2002 Rating: 4.90/5 Votes: 28 Popularity: 6.94 Licence: CPOL Views: 654,333 Bookmarked: 153 Downloaded: 8,729 Please Sign up or sign in to vote. This article explains the potential problems with having multiple pending recvs calls on a single socket.
	A Reusable, High Performance, Socket Server Class - Part 1 25 May 2002 Updated: 17 Aug 2002 Rating: 4.83/5 Votes: 44 Popularity: 7.80 Licence: CPOL Views: 1,026,009 Bookmarked: 352 Downloaded: 25,688 Please Sign up or sign in to vote. Writing a high performance server that runs on Windows NT and uses sockets to communicate with the outside world isn't that hard once you dig through the API references. What's more, most of the code is common between all of the servers that you're likely to want to write.
	A reusable, high performance, socket server class - Part 2 25 May 2002 Updated: 17 Aug 2002 Rating: 4.70/5 Votes: 33 Popularity: 7.02 Licence: CPOL Views: 937,515 Bookmarked: 192 Downloaded: 5,943 Please Sign up or sign in to vote. To maintain performance a socket server shouldn't make blocking calls from its IO threads. This article builds on the previous one to add a business logic thread pool to our example server.
	A High Performance TCP/IP Socket Server COM Component for VB 15 Jun 2002 Updated: 25 Jun 2002 Rating: 3.50/5 Votes: 11 Popularity: 3.64 Licence: CPOL Views: 393,565 Bookmarked: 60 Downloaded: 11,554 Please Sign up or sign in to vote. Although socket based TCP/IP servers using IO Completion Ports are often written in C++, it's sometimes useful to write such a server in Visual Basic.
Programming Languages
C++	Store COM+ administration details as XML files to help with source control 8 Apr 2002 Updated: 8 Apr 2002 Rating: 5.00/5 Votes: 6 Popularity: 3.89 Licence: CPOL Views: 54,033 Bookmarked: 23 Downloaded: 643 Please Sign up or sign in to vote. There's no standard way to save complex COM+ application configuration in a form that can be placed under version control. This article presents 2 scripts that take advantage of the COM+ Catalog accessibility via script to provide functionality that should really come as standard.
Visual Basic	COM Mailslots - Designing asynchonous COM components for VB 10 Apr 2002 Updated: 10 Apr 2002 Rating: 5.00/5 Votes: 10 Popularity: 4.77 Licence: CPOL Views: 101,482 Bookmarked: 36 Downloaded: 1,054 Please Sign up or sign in to vote. This example COM component provides 3 COM objects for using the Win32 Mailslot IPC mechanism. The component may be useful if you need to communicate from VB using Mailslots.
XML	Testing TCP and UDP Socket Servers using C# and .NET 20 Jul 2002 Updated: 20 Jul 2002 Rating: 4.92/5 Votes: 20 Popularity: 6.05 Licence: CPOL Views: 320,099 Bookmarked: 192 Downloaded: 11,964 Please Sign up or sign in to vote. When you're developing a TCP/IP server application, it's easy to test it poorly. In this article, we develop a test framework that does most of the hard work for you.

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Len Holgate

Software Developer (Senior) JetByte Limited

United Kingdom

Len has been programming for over 30 years, having first started with a Sinclair ZX-80. Now he runs his own consulting company, JetByte Limited and has a technical blog here.

JetByte provides contract programming and consultancy services. We can provide experience in COM, Corba, C++, Windows NT and UNIX. Our speciality is the design and implementation of systems but we are happy to work with you throughout the entire project life-cycle. We are happy to quote for fixed price work, or, if required, can work for an hourly rate.

We are based in London, England, but, thanks to the Internet, we can work 'virtually' anywhere...

Please note that many of the articles here may have updated code available on Len's blog and that the IOCP socket server framework is also available in a licensed, much improved and fully supported version, see here for details.