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How to develop an App for multiple mobile-OSys?

Hey there folks,
after reading these forums for quite a while and having several smartphones during the last years, I reached the point where I want to start creating my own apps. I tried to google around a bit and found some interesting tutorials on how to start creating apps. I also found several SDKs for different operating systems. But exactly that is the point leading to my question.
Before starting to code: is it possible to choose a platform from where my app can be delivered to each winmo, iphone, blackberry or android?
Or is that just plain impossible? I mean, those are all touch based devices Should'nt be that much of a difference? Originally I wanted to start developing an iphone app, but that would leave out all the android users and so on. I don't want to rewirte everything from scratch for an android device after having finished the iphone variant. And that did not even consider the advent of windows 7.
So, is there any way of coding for all the operating systems, keeping the effort of switching between operating systems low?
greetings and thanks in advance for your help,
your unexperienced coder-in-spe,
joker

While all four of the devices mentioned all use ARM processors of various flavours to do the work, they are four completely different operating systems, each with their own IDE and programming models.
Even considering Windows Mobile, you have to decide whether you are programming for a SmartPhone/Classic or a Pocket PC/Professional device. In this case it is possible to write code that will run on both WM platforms, but you will have to make that decision at design time, before you even think of writing a single line of code. Your application will then have to act accordingly, depending on the machine on which it runs.

java apps for symbian often works ok on wm using a midlet manager
not sure about android and blackbarry but being java not too much code would be required to port it I suppose
mind you java on wm work pretty poorly
and iphone got rules that you can only make apps using objective-C/c/c++ and their SDK
which is only available if you own a mac computer

Thank you for your answers. Looks like starting to code is not that simple as expected. So I will try developing for iPhone only :/

[Q] Certificate Store in WP7

Hi,
As per the subject, I have been given a Windows Phone 7 device and been tasked to see if a root/user certificate can be extracted from the phone.
We install certificates onto mobile devices such as iPhones, to allow IPSEC VPN tunnels and secure access to exchange servers.
Using the tools I found on this site, I have managed to unlock my test WP7 device, installed the root and user certificates on my WP7 (I downloaded it from our test site) and I also install Advanced File Explorer on WP7 phone.
Based on my rudimentary research, the Certificate Store is not accessible on a WP7 device and the only to remove a certificate from the store is to reset the phone to factory settings.
In the root of the WP7 phone, there is a file called drmstore.dat. I have used Advanced File Explorer to copy this file to my desktop and using NotePad++ see that it does have some MS root certicates in there. But is this the file that would contain the user installed certificates?
My WP7 experience is limited to 3 days so far, so was hoping somebody could point me in the right direction wrt to file location. From what I've read, the OS does seem to be designed really well, so I am hoping that it is indeed impossible to extract the certificate from the device.
The only reason we are doing this test is to work out if the new phone is secure as it is getting difficult to get hold of Windows mobile 6.5 phones as the days progress. The problem is that WP7 phone dont support disk encryption yet (or so I believe) hence the worry ...
Many thanks in advance for your help and pointers.

if the phone is locked then it is really impossible to get it off the phone.
after the update from MS we aren't able to unlock the phone again so I think it is pretty save.
maybe you could look at a dump of a rom to find out where the serts are stored.

Thanks for your reply.
There are interesting times ahead.
The Chevron WP7 exploit will be closed but hte Touchxplorer developer claims that his solution will still allow full file access to system, so I am waiting with bated breadth to see how it all pans out. And who knows, we may have Nokia announcing that they will be using WP7 as an OS for their Nokia hardware on Friday.
Since I am not to au fait with the structure of WP7 phone (and I don't even know why I was given this job considering my hacking skills are about 5%) would you have an inkling as to where they sort of could be kept or how to read or even create a dump of the ROM?
Many thanks. I will search on the forums to see if I can get more information.
Thanks again.

[Q] Can Rapiconfig can be used on WP7.x?

Ok, so basically what I am trying to achieve is configuring the security policies on a WP7 device. Currently at WP7, but will be moving up to 7.1/7.5 to try and figure this out for all platform variations.
I've some experience with Rapiconfig on WM6.5 devices, basically configuring the policies listed here but as yet I haven't found a way to push XML direct to the device to update these on WP.
Another route here is to unlock via Chevron and use the registry editor - the issue there is knowing which registry keys are applicable to which security policy - which I know others are also trying to figure out at the moment, but without a full mapping as yet.
Any help here would be great - and if anyone could point me to a Provxml tutorial I would also appreciate it - having trouble deciphering the many guides available.
Thanks as always, this forum is a wealth of positive information and an example of community support at its best.
Cheers,
Mark

http://forum.xda-developers.com/showthread.php?t=936235
that's the most complete tut which is customized to the windows phone.

Yes we use this on samsung devices.
Can you contact me? I might need some help. But we use it to provision xml's

mark14 said:
Ok, so basically what I am trying to achieve is configuring the security policies on a WP7 device. Currently at WP7, but will be moving up to 7.1/7.5 to try and figure this out for all platform variations.
I've some experience with Rapiconfig on WM6.5 devices, basically configuring the policies listed here but as yet I haven't found a way to push XML direct to the device to update these on WP.
Another route here is to unlock via Chevron and use the registry editor - the issue there is knowing which registry keys are applicable to which security policy - which I know others are also trying to figure out at the moment, but without a full mapping as yet.
Any help here would be great - and if anyone could point me to a Provxml tutorial I would also appreciate it - having trouble deciphering the many guides available.
Thanks as always, this forum is a wealth of positive information and an example of community support at its best.
Cheers,
Mark
Click to expand...
Click to collapse
Yes we use rapiconfig, but when we use it it's an on-device version of it which resides in the \Windows directory and so far the only arguments that have been tested to work with it are provxml filenames. Marvin_S, you're a perfect resource for this .

[Q] Wanting to start creating homebrew applications.

Ok, so I have no experience of working with any type of coding of development except for Adobe Flash. I don't think that really counts though, nor help me here, but I want to start off by saying that I'm simply a 17 year old.
I want to start development of an app to edit the registry. For example, I got the idea for everytime you click a button on the app, it edits something on the registry. Of course, phones will have to be Interop-Unlocked (Which my Samsung Focus is).
So to get on topic, how may I start creating an app for Windows Phone to edit registry and etc.? As I said before, I really don't have much experience, but I would love to learn and help the community.
Thanks in advance.

Bump up....

Ok, basic first steps: do you have the WP7 SDK? You can get it for free, and you'll need it. It includes the tools to build and deploy apps (compilers and so forth).
The project you're talking about is a bit heavy for a first foray into app development, but you can give it a shot. One of the easier ways (for me, at least) to learn things is to look at what other people did, which in coding usually means looking at open source projects. There are a few open-source apps which access the registry.
For example, my MultiTaskToggle app (linked in my sig) works on Samsung and provides an example of how to read and write a specific registry value.
If you want to browse the registry at all, you'll need something different. This can be done, using COM to call native APIs. Look at the Homebrew library (used by the Webserver projects, among others) or WP7 Advanced Explorer (open source, code is on Codeplex). These types of project have two parts: managed (.NET code, typically in C#) that calls the COM interface, and native (C/C++, written using the Windows Mobile SDK) that implements the COM object.
You may want to do some research online to get started, either here on XDA-Devs (though I think most tutorials here assume at least basic knowledge) or elsewhere (even from MS directly) if you're really starting from scratch.

Android VPN auto config

Hi
I was not sure not sure where to post this question exactly, but I need some thoughts on a issue at work. We have about 200+ android devices that need a VPN config loaded onto them.
Apple, as pointed out by an apple nazi fan, has an apple config utility that allows a config to be mailed to the clients and applied by opening the attachment. Which is exactly what I am looking for.
I searched around and from what I gathered some people recommend a custom ROM to writing a android app using the android vpn api (available from ICS). any other suggestions would be greatly appreciated