Buzzdev.org

I haven’t been on here a while and I apologize for that. This summer has been a busy one for me – first in summer school for AP Macroeconomics for 6 weeks and then I went back to India for 4 weeks. I’m back now and of course, school starts in 2 days. But I have been doing some WinMo stuff over the past 2 months. However, I haven’t been working on my OnDemand customization. Instead, something bigger has caught my attention.

Ever since Da_G over at XDA-Developers created a thread about the Image Update system, I’ve been following and developing some of my own software. For those who don’t know, the Image Update system allows for you to update the IMGFS and XIP partition of your phone via cab files instead of flashing the device and losing all personal data/installed applications. To make this mechanism work, which has been present in Windows Mobile since WM5, all of the DSMs (Device Side Manifests) need to be in the proper MS format. Unfortunately, all of the current kitchen tools that we use for ROMs malform these DSMs or completely remove them from the ROMs. Because of that, I’ve been working on applications that will make Image Update work properly. In June, I was able to create two applications – one that regenerated DSMS from scratch in the exact same way MS’s tools are supposed to work. The other would create the Image Update packages and sign them - they produce the same results as the ones generated my MS’s tools as well. I’ve been working to consolidate them into one app that will also act as a ROM kitchen that adheres to MS’s documentation (for the most part :D).

For those who are interested, you can check out Da_G’s thread in the Dev & Hacking section of XDA (I’m too lazy to link to it right now :D)

Where to start?

It is safe to say that there are more options for development on Windows Mobile 6 than on any other mobile platform. WM has been around for a while, and Microsoft has built up a huge variety of APIs and development tools to support the platform. This is good – no matter what your preferred style of programming is, there is probably a supported solution on WM. It can also be confusing if you are trying to find out where to start when developing an application.

The options include:

• Browser based development using scripting languages and Flash or Silverlight. This option is poorly supported in the existing mobile browsers, so at the moment, this is not a practical option.
• Managed Code using . NET languages and the .NET Mobile Library.
• Native coding using C++ and Windows Mobile native libraries.

Note: Not all Windows Mobile native libraries have managed equivalents. This means that the author of a managed program (in C# or VB for example) will have to use cumbersome and potentially unsafe methods to integrate the native library into the managed application if they wish to make use of the full libraries.

There are also different flavors of Windows Mobile 6: Standard and Professional. The big difference is that Professional devices have touch screens, and generally more features. It’s reasonable to expect that the performance of a professional device will be superior to that of a standard (no touch screen) device and the touch screen allows more input possibilities so I expect to focus on those devices.

At the moment, I’m not sure if I want to develop on managed or unmanaged code. I prefer to develop in C# using managed code, but may need the performance and APIs that are available to the C++ programmer. Luckily, I will use the same tools to develop both kinds of applications for WM, so I don’t have to decide what environment to use quite yet.

Reading up

In the past, the first stop in making sense of all these options would be to check Microsoft’s official documentation on MSDN, but that is changing. The official starting point for development on Windows Mobile is now the Windows Mobile Developer Portal.

For the moment, I actually prefer the material found on a different site -Windows Mobile Developer Center, although I’m told that these two sites will be integrated in the next few months. This site has webcasts, videos, and (of course) this blog.

The first thing I want to do is set up my development environment, and so I started looking for a section that would tell me how to start.  I already have a copy of Visual Studio 2008 installed, and wanted to use it, so I looked for that first.

Setting up

Note: Unlike the documentation on MSDN (Windows Mobile 6 Documentation) which only covers Visual Studio 2005, the information I found for setting up Visual Studio 2008 on the Developer Center was in videos. See http://code.msdn.microsoft.com/WM6YourFirstApp for a good getting started video.

Although the videos are current, excellent and accurate, watching the video is more time consuming than reading a procedure, (and impossible to find via search) so I’ll summarize them here:

1. Install Visual Studio 2008. The SDK only works with the Standard and Professional editions, not with the free Express editions. There is a 90 day trial edition that you can download for free at the following web page: Try Visual Studio 2008 – Trial Software.
2. Install the Visual Studio 2008 Service Pack 1 and .NET Framework 3.5 Service Pack 1. There may be other service packs available by the time you read this. Information on the latest service packs may be found at the following page: Visual Studio 2008 Development System.
3. Download the Windows Mobile 6 SDKs from the following page: Mobile 6 Professional and Standard Software Development Kits Refresh. I am installing both, although I am planning on writing only for the Professional Edition device. You never know when you might change your mind!

Note: if you have installed the SDKs before Visual Studio 2008, you will need to remove and re-install them after the VS 2008 install.

Building a test application

To confirm that you have a working installation of Visual Studio and the SDK(s), try creating a simple application. I created a blank C++ project by following these steps:

1. On the start page of Visual Studio 2008, in the upper left hand corner, there is a block titled “Recent Projects”. At the bottom of this block, there is a link for Opening a Project, and for Creating a Project. Choose Create Project.
2. In the New Project dialog box, choose “Visual C++, then “Smart Device in the Project Types list. The Templates section should be populated with different project templates for different kinds of projects.
3. Choose Win32 Smart Device Project, and enter a name for the project. “Test” is fine. Click OK.
4. The Win32 Smart Device Project Wizard opens. The presets are set to Windows Mobile 5.0, which I don’t want to use, so I choose the Next button at the bottom of the dialog.
5. This brings up a list of installed Windows Mobile SDKs. I am going to remove the Windows Mobile 5.0 SDK from the Selected SDKs list, and add the Windows Mobile6 Professional SDK and Windows Mobile Standard SDK. Once this is done, I click Next.
6. In the Project Settings Dialog, I select “Windows application” and click Finish. The dialog closes, and Visual Studio creates a new project, populated with basic files, named “Test”.

In Visual Studio, I make sure that “Windows Mobile 6 Professional Emulator” is chosen in the drop down list on the upper left tool bar. I then build the application “Test”, and choose to start debugging.

The Emulator appears, and in a moment, my application (with a blank screen) loads and is displayed in the emulator.

Clicking on the close icon in the upper right hand corner shuts down my application, and Visual Studio returns to its default state.

Excellent – that was easy, and everything works!

If I wanted to build for a different flavor of Windows Mobile (Standard, Windows Mobile 5, or deploy to an actual device, I would choose a different option from the upper left hand tool bar drop down. Does it all make sense so far?