RIL + C#.NET + Windows Mobile 6.0: The application crashes

Question

Hi All,

 

Background:

• I am developing an application for WinMobile 6.0
• The device that I am currently use is HTC TyTN II
• I use the "[DllImport("ril.dll")]" functionality in order to get some phone info
• There is a thread that runs all the time in the background and samples few parameters in RIL
• I use such RIL functions as "RIL_GetSignalQuality", "RIL_GetLineStatus", "RIL_GetCellTowerInfo"...

The problem:

• Sometimes the application crashes without even throwing an exception.
• Looks like memory leak...
• The application may, sometimes, work for 15-20 minutes and then crash. And sometimes it can crash right in the beginning (after 2-3 samples).

What I've already done in order to try to fix the problem:

• I have minimized the application to only one parameter (one of the functions above) that is sampled once in 2 seconds - the application still crashes.
• Once I remove the call to the RIL function (this is the ONLY thing I remove) - the application works properly (without crashes).
• I have tried to remove all the code from "rilResultCallback" function (the one that is called by RIL once the result is ready) - didn't help.
• Trigger that helps to throw the application is moving it to the background by pressing the "Call" (green) button on the device - the application crashes without it as well.
• Similar application on C++ works fine on this device.
• I have tried to initialize the RIL in application start and finalize in the application end. And I have tried to initialize each time right before requesting the information, wait to the answer and the finalize.
• Tried to wait for the answer (previous bullet) by just calling "Thread.Sleep(500);" and by

  "waitHandle.WaitOne(5000, false);".

 

I can post some code samples on demand...

 

Please HELP!

 

Cross-posted.

Answer 1

Hi,

 

To rule out the RIL code you are using it might be worth taking a look at Dale Lane's blog entry, he includes the RIL code he has used, I have also used it and did not see any problems. If this still causes an issue then you would have to start replacing other factors in the equation :-

 

http://dalelane.co.uk/blog/?p=241

 

Hope this helps.

 

Paul Diston

 

Answer 2

Hi Mastema/Paul,

I am also experiencing the same behavior of random app crash after RIL_GetCelltowerInfo invocation in my windows mobile code. My environment is .NET 3.5 Windows Mobile 6.0 SDK and the phone is HTC 8525.

Paul, I am using the same code as given in your link.

Mastema, did you find out any solution for this in C#?

regards
srividhya

Answer 3

Hi SV123,

did you or somebody else found a solution to this problem. I'm experiencing the same problems.

I try to initialize RIL once on application start and deinit on ending, but then i get no updates on

RIL_GetCellTowerInfo


Anybody?

Cheers..

Answer 4

I was experiencing exactly the same issue as you. To help others who may stumble onto this issue, please see http://www.dzhang.com/blog/2009/12/15/watson-crash-in-ril_getcelltowerinfo