Observing port by RComm::NotifyDataAvailable()

[ehsanTC]

Hi
I want to observe a port on my device to notify when a data is available.
I created and initialized a piece of code like below:

   RComm iComm;
   RCommServ iCommServer;
   TCommConfig iConfig;
   .
   iCommServer.Connect();
   iCommServer.LoadCommModule(iCommPort.iCsy);
   iComm.Open ( iCommServer, iCommPort.iPort, ECommShared, ECommRoleDCE);
   .
   .

and then when I execute the :

 iComm.NotifyDataAvailable(iStatus);

I get KERN-EXEC 0 panic.

Do you know where is the problem?
Thanks.

[vineet.jain]

The following three lines must have returned a code,if its something negative then problem lies there only.

iCommServer.Connect();
iCommServer.LoadCommModule(iCommPort.iCsy);
iComm.Open ( iCommServer, iCommPort.iPort, ECommShared, ECommRoleDCE);

[ehsanTC]

The mentioned lines are encapsulated in User::LeaveIfError().
I didnt write them for conciseness.

[symbianyucca]

basically the KERN-EXEC 0 means that you are trying to use R-Class that is not initialized properly, i.e. the opening/connecting has failed for some reason, thus I would suggest re-debugging the code and seeing what line of code is actually giving that, and then seeing what has been done for thr R-Class object used in that line, and seeing all initialization has been done without errors.

[ehsanTC]

Hi
the line

iComm.Open ( iCommServer, iCommPort.iPort, ECommShared, ECommRoleDCE);

returns KErrLocked. Whats the reason?
If i change the TCommRole parameter to ECommRoleDTE no error will be returned.

[ehsanTC]

Hi again
Not getting any response, I decided to explain the situation more.
I have a class which make it easy for me to write to and read from ports easily. In the factory function of this class i take a RCommServ object and a TCommPort object which were opened and configured before. For Example:

class MyPortClass : public CActive
{
public:
static MyPortClass* NewL(MyPortClassObserver&, RCommServ&, TCommPort&);  
void SendL(TDesC&);
void ReceiveL(TDesC&);
.
.
private:
InitializeL(RCommServ&, TCommPort&);
.
RComm   iComm;
.
};

In the InitilizeL() method I always get an error like KErrAccessDenied, KErrLocked,....
The implementation of InitilizeL() is:

void MyPortClass::Initialize(RcommSer& aServer, TCommPort& aPort)
{
   .
   // I always get an error here.
   User::LeaveIfError(iComm.Open(aServer, aPort.iPort, ECommShared, ECommRoleDCE));
   .
}

If I change the ECommRoleDCE to ECommRoleDTE the error would be solved.
Whats the differences between these enumerators?
Why I get KErrLocked when I opened the port by ECommShared?

If I just create one instance of MyPortClass in my project, I get KErrAccessDenied and if I creat e more objects i get KErrLocked.

[ehsanTC]

I changed the code a bit.
At present, Although the result of opening iComm object is 0, when I invoke iComm.Write(), I get KERN-EXEC 0 panic.
What is the problem?

[ehsanTC]

The RComm::Open() needs some CAPABILITIES like:
NetworkControl
NetworkServicies
CommDD
(I added LocalServicies but not sure it is mandatory).

Unfortunately, I still can't use functions like RComm::Write() and RComm::Read() properly, Since the former never activate RunL() and the late returns with iStatus.Int() == KErrInUse.

I wish someone could provide us with a class to easily write to and read from ports.