Samsung has a percussion application for their phones known as Caxixi (pronounced Ca-shee-shee) . The application makes use of the touch screen and the accelerometer to allow you to control up to 5 percussion instruments at once. If you’ve never seen it before take a look at this YouTube video.
Samsung has recently updated the application so it is now available for the Omnia II. You can download it from samsungcaxixi.com.
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I was looking for a Windows Mobile specific WCF reference since I knew that the Compact Framework doesn’t support all of the same WCF profiles that the desktop framework does. I was searching for a webcast that was done on the topic when I stumbled upon a document that had the information I was seeking on the CodePlex. You can see the document for yourself here. The document was created by Michele Bustamante aka That Indigo Girl.
The document contains a lot of good information and is written for the developer that has no experience with the compact framework or WCF. Only experience with the .Net framework is required. It will walk one through the steps of setting up their development environment for mobile development.
By the way, I did find a listing of the limitations for which I was looking.
Feature
Support
Streaming
Not Supported. Contract can use Stream parameters but they will not be buffered or streamed.
Sessions
Transport sessions not supported. Service contract can use SessionMode.Allowed. Service should use InstanceContextMode.PerCall behaviour.
Duplex
Services designed for duplex communications with callback contracts cannot be called by mobile clients. Duplex requires a transport session.
Transactions
Service contract cannot require transaction for any service operations.
Data Contracts and Serializable Types
Can freely use. The mobile client will use XmlSerializer types that are wire compatible
Message Contracts
Can freely use. If the message contract includes custom headers proxy generation will not work. Mobile client requires additional custom code to work with headers.
Fault Contracts
Can include in the service contract. Proxy generation will not include fault contracts so additional custom code for mobile client is required to work with faults.
There are quite a few more limitations to know about for WCF in the Compact Framework. I won’t name all of them here since I think the document does an excellent job of detailing the limitations. At a length of only 72 pages including diagrams its a document that a developer should be able to easily get through.
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For any mobile operating system that you can name you can find some one that will point out what they feel to be a flaw in the operating System. Mike Calligaro of the Windows Embedded team knows this all to well. If you read through the reader responses to many of his post you’ll find a plethora of emotionally charged responses For some of the responses I get the feeling the reader didn’t actually read the entire post. For others some readers make pretty good arguments. In either case I decided to collect what I thought to be the most interesting post addressing features of Windows Mobile that many have questioned.
As much as I love the job, there are certainly frustrations as well. One of them is that more than half of the code on one of our phones is written by other people (OEMs, ISVs contracted by OEMs, ISVs contracted by Mobile Operators, etc) and any failing in any of that code is usually blamed on us.
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So you’ve installed Visual Studio and you are ready to create a Smart Device project for your Windows Mobile device. But when you go to create a new project the Smart Device templates are no where to be found. Why is that? Let’s look at the possible causes for this problem.
Is your Visual Studio Version an Express Edition?
Presently Microsoft doesn’t have a version of Visual Studio Express that can be used to create smart device projects. If you are running an Express Edition of Visual Studio you will need to replace it with a professional version to develop for Windows Mobile.
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As of today the “24 Hours of Windows Mobile” presentations are 2/3 complete. I’ve been keeping track of the presentations. If you would like to see any of them the links are below.
Demonstration of the State and Notifications broker and other features of Windows Mobile that can assist in developing applications that consume less power
Learn how to properly start and terminate threads, update user interface controls inside multiple threads, and call Web services asynchronously.
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Michael Herald of Mobility Today has posted a video of Windows Mobile 6.5 with IE6 running on his HTC Diamond. It runs incredibly well. See the Mobility Today site for more details.
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Creating a cab installer for a Windows Mobile program is easy. After making a cab project you add your files and Visual Studio does everything else for you. But when you uninstall your application what happens to all of the registry entries and data files that your application has made? They get left behind unless you erase them yourself. Chances are your program won’t ever receive any notification that it is about to be uninstalled, so your program won’t be able to cleanup after itself. Instead you will need to create a DLL that contains custom actions. The installer build into the Windows Mobile device will call your DLL once before installation, once after installation, once before deinstallation, and right after deinstallation. So how to you make this custom DLL?
The custom DLL will be a Win32 DLL smart device project. The DLL must define four functions, Install_Init, Install_Exit, Uninstall_Init, and Uninstall_Exit. To cleanup after your program has been uninstalled you will place cleanup code in Uninstall_Exit Here is the code for the custom actions DLL that I wrote. I’ve added code to clean up the registry. If there are other programs that I’ve written still on the device they will be using the same registry hive to store their keys. If other programs are found the program will leave behing the \HKCU\Software\J2i.Net key as not to accidentally erase the keys that my other programs use. If there are no other programs found then J2i.Net will be removed.
To export the four functions the DLL will also need to contain a Module Definition file that exports the four functions. The contents of that file must look like the following.
EXPORTS
Install_Init
Install_Exit
Uninstall_Init
Uninstall_Exit
That’s all that needs to be in the DLL. When you create your installer you will need to add both the primary output of your program and this DLL to the project. The last thing that you need to do is change the CE Setup DLL setting on the CAB project. Select the CAB project from the Solutions Explorer and you will see the CE Setup DLL setting in the property editor. Click on the dropdown to the right of the setting and select Browse. Navigate to the native DLL that you created and your done. All you need to do is compile and build the CAB.
As an example there is a Visual Studio project attached to this entry. The project contains a program of trivial simplicity. All that you need to know about that program is that it will save the information you enter to the registry. Without the custom action when you uninstall this program that information would be left in the registry. But thanks to the custom action it will be removed.
This isn’t the first observation of this type that I’ve seen, but Apple has filed for a patent for adjusting phone volume based on ambient noise. As the noise in the environment goes up so will the phones volume. Oddly enough I’ve seen a similar system published in an MSDN magazine for Windows Mobile phones.
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Earlier today Microsoft announced its plans for adjusting to the world economy. The news story I read stated that mid-PC sales were down while server software was up. I can’t help but associate that with what a Sony exec called “A race to the bottom” in which consumer and OEMs begin to target building the cheaper computer instead of the higher performing computer. With the increasing emphasis being placed on Cloud Computing and Web Services and it all supports a prediction that software was going to move from the individual PCs back to the servers. We can find evidence of this now. Previously if you wanted to work on a word document you needed a computer with sufficient space and a reasonably powered processor. You would then need to purchase and install Microsoft Word and you could edit documents from your siloed computer. While you can still do this today you also have the option of using an online service to essentially do the same thing. You can use a low powered computer with any of a variety of operating systems as long as that computer has a supported browser. The power of the individual computer matters a little less and connectivity matters a whole lot more. as applications begin to target modern terminals.
It’s possibly that my view of the future is slightly exaggerated but I doubt it is completely wrong. That being said my plans for adjusting to what I think to be the needs of the future are to accelerate my learning path for Microsoft Azure Services Platoform and Live Services. I’ve been experimenting with Live Services for some time now and have found them to be useful in quickly putting together useful applications. An Azure application runs across several 64-bit Windows 2008 servers. Installation of patches is handled for you, failover is taken care of, and so are several other maintenance tasks allowing development of highly available, secure, and redundant applications with more ease. Effective use of the platform is going to require a different way of thinking than developing the traditional application so I plan to get started tonight with the intent of having information to teach and share within the next week.
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I was reading through Mike Francis’s blog and saw a rather useful offer from Microsoft for free eBooks on LINQ, ASP.NET Ajax, and Silverlight 2.0. If you are interested all you have to do is register and you can download the eBooks. I’ll be teaching a Silverlight class in a little over a month so I hope to review the Silverlight book fairly soon so that I can consider recommending it to the students.
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I’m glad Mike Hall posted on this. There is a free book available to those wanting to learn C#. This is especially convinient for me because I was going to write a series of “Getting Started” articles on Windows Mobile development and I really see the task of learning the C# (or vb.net) language as being separate from learning how to target Windows Mobile devices. I’ll be referencing this book in one of my next articles.
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If you’ve developed a Windows Mobile application and would like to see it listed on the Windows Mobile Application Catalog then it will need to be tested for certification requirements and code signed. This normally cost up to $800. But Microsoft is offering a program whereby you can have these services performed for free. Just visit the Innovation Site and register. Remember, make sure that your application adhere’s to certification guidelines before submitting the application. Otherwise you could consume part if the $800 woth of service unnecessarily.
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As promised I uploaded the wrapper for the Skyhook Wireless SDK for Windows Mobile to the Skyhook Wireless discussion group. I tried the wrapper out with the 3.0 SDK and it works fine. It exposes all the SDK functionality with the exception of the WPS_tune_location function (I have no idea what that function does). So I am done with my interaction with the Skyhook Wireless SDK for now.
If you program in C# or VB.Net and want to use the SDK then you can get the code from the files area of the Skyhook Wireless discussion group.
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I was reading through WMPowerUser yesterday and happened upon an article on Augment Reality on Windows Mobile. The article shows some videos from the Christian Dopler Laboratory in which a mobile device is being used to track photographs and business cards and project 3D elements on them. Very cool! Best of all there is code available for the computer vision library that they used. Follow the link for the code and videos.
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Beyond having mentioned the Windows Mobile Power Toys once in refering to the “24 Hours of Windows Mobile” webcast I’ve not actually spoken about it. But given the level of popularity I’ve decided to write an article covering it along with the EQATEC Profiler and the EQATEC Tracer. All of these are free tools. I wrote my outline for the article last night and am now working on the example code. This will be something usable by both those that use Visual Studio and those that develop for Windows Mobile without Visual Studio.
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