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Going Mobile with the Active Template Library

  • January 9, 2008
  • By Nick Wienholt
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Although the prospect of implementing a free-threaded component may not appear attractive to developers who have struggled with understanding the COM global interface table, it is worth noting that the complexities of needing to go between multiple STAs and the MTA do not exist in Windows Mobile because apartments are not present in the slimmed-down COM plumbing. The other point worth noting is that the primary use of COM on Windows Mobile is to integrate with and extend user interface elements such as the Soft Input Panel, Internet Explorer, and Media Player. In these scenarios, a COM component will be called on the user-interface thread, and will not be subject to the same level of multi-threading stress as a COM component in a server environment.

ATL simplifies the consumption and production of COM components, and the version of ATL available for Smart Device projects offers the bulk of functionality from the full ATL version. The COM implementation that ships with most builds of Windows CE, including all Windows Mobile builds, lacks many of COM's advanced features like apartments, and this simplifies the programming experience for C++ developers using ATL. For the C++ developer with some experience with templates and COM, Smart Device ATL offers a fast track for integrating with a range of Windows CE technologies.

About the Author

Nick Wienholt is an independent Windows and .NET consultant based in Sydney. He is the author of Maximizing .NET Performance and co-author of A Programmers Introduction to C# 2.0 from Apress, and specialises in system-level software architecture and development, with a particular focus of performance, security, interoperability, and debugging.

Nick is a keen and active participant in the .NET community. He is the co-founder of the Sydney Deep .NET User group and writes technical article for Australian Developer Journal, ZDNet, Pinnacle Publishing, CodeGuru, MSDN Magazine (Australia and New Zealand Edition) and the Microsoft Developer Network. An archive of Nick's SDNUG presentations, articles, and .NET blog is available at www.dotnetperformance.com.

In recognition of his work in the .NET area, he was awarded the Microsoft Most Valued Professional Award from 2002 through 2007.





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