cancel http operation

[badzio]

Hi,

I've following classess:
class CMyHttp: public CBase, public MHTTPDataSupplier, public MHTTPAuthenticationCallback
class CMyNet: public CActive, public MHttpObserver
class CMyHttpHandler: public CBase, public MHTTPTransactionCallback
where MHttpObserver is my interface.
object of CMyHttp is created in CMyNet class, I passed CMyNet object to CMyHttp, each event MHTTPTransactionCallback::MHFRunL call some function from CMyNet/MHttpObserver.
CMyNet is active object with own, separated thread.
What I do is:
1) from main application thread I complete CMyNet::iStatus
2) in RunL (it works in separated thread) I create CMyHttp object. CMyHttp creates RHTTPSession and RHTTPTransaction, opens session, sends http request RHTTPTransaction::SubmitL()
3) server answers very slowly (no idea why, it doesn't matter), I'd wait about 2minutes than I get correct http response
4) I don't want wait so long, so I cancel operation. From main thread I call CMyNet::Cancel().
5) In CMyNet:oCancel() I delete CMyHttp.
6) In CHttpConnection::~CHttpConnection I close RHTTPSession and delete RHTTPTransaction. But RHTTPSession::Close() causes panic KERN-EXEC 0.
Of course, if I wait till http response and after that close RHTTPSession than it works fine. Problem is only in mentioned case - if RHTTPSession::Close() is called between RHTTPTransaction::SubmitL and http respond.
What do I do wrong? Any idea?

PS I'm talking about S60 FP1, emulator and device

[badzio]

Something more...
I wait for http response. In MHttpTransactionCallback::MHFRunL I check aEvent.iStatus, if it's equal THTTPEvent::EGotResponseBodyData I analyze response and decide to break transaction. than I call RHttpTransaction.Close() and from CMyNet delete CMyHttp. Destructor is called, then RHttpSession.Close() is called and application hangt, nothing happens. No crash, no panic, no error, just nothing

[keerthi.ck06]

try to close all these then http transaction will close
RHTTPSession::Close(),RConnection::Close(),RSocketServ::Close().

[badzio]

I tried. But as I wrote - RHttpSession::Close() causes panic kern-exec 0

[kishore84]

I tried. But as I wrote - RHttpSession::Close() causes panic kern-exec 0

To cancel a trasaction cancel RHTTPTransaction object i.e RHTTPTransaction close
is sufficient.

Also show me the exact code (I want the closing sequence )how u r caceling the request.

[badzio]

class CMyHttp: public CBase, public MHTTPDataSupplier, public MHTTPAuthenticationCallback
{
	MHttpObserver iObserver;
	CMyHttpHandler* iHttpHandler;
	RHTTPSession iSession;
	RHTTPTransaction iTransaction;
}

class CMyNet: public CActive, public MHttpObserver
{
	CMyNet& iHttp;
	CMyHttp* iThis;
	public:
	static CancelProcess();
}

class CMyHttpHandler: public CBase, public MHTTPTransactionCallback
{
}

CMyHttp::~CMyHttp()
{
	iSession.Close(); //<- this line causes panic in main thread
	delete iTransaction;
	iTransaction = NULL;
}

// please remember that CMyNet has own, separated thread, runl is running this separated thread, CActiveScheduler has been also started in this thread
CMyNet::RunL()
{
	switch (iStatus.Int())
	{
	case X:
		iHttp = new CMyHttp(*this);
		iHttp->Start();
		iStatus = KRequestPending;
		SetActive();
	break;
	}
}

//this function is called from main thread
CMyNet::CancelProcess()
{
	iThis->Cancel();
}

CMyNet::DoCancel()
{
	delete iHttp;
	iHttp = NULL;
}

Problem occurs only in one case - CMyNet::CancelProcess() is called between iTransaction.SumbitL() and response from server

[kishore84]

Just try like below

CMyHttp::~CMyHttp()
{
        iTransaction.Close();
	iSession.Close(); //<- this line causes panic in main thread
}

Also ur code does not look very good. u don't need to delete ur entire sesiion while caneling a transaction.

here is a nice exp u can check
http://www.forum.nokia.com/info/sw.n...I_Example.html

[badzio]

I'm doing this similar way like in example.
I've found the reason of kern-exec 0. My application has 2 threads - main thread A and separated thread B. RunL is running in thread B. But when I call Cancel() from thread A than DoCancel is running also in thread A, not B.

[kishore84]

I'm doing this similar way like in example.
I've found the reason of kern-exec 0. My application has 2 threads - main thread A and separated thread B. RunL is running in thread B. But when I call Cancel() from thread A than DoCancel is running also in thread A, not B.

woh i c !!any way have u seen the reason of kwernexec 0

This panic is raised when the Kernel cannot find an object in the object index for the current process or current thread using the specified object index number .

See in this type of implementation as mentioned by u there are a lot of possibilities of pbs u may get into . Normal thing is the active object of different threads can't share resouces bet them. So u may submit ur transaction in one thread and I am wondering how ur 2nd thread's active object get notified to the events ?????

[badzio]

Now I don't call Cancel(), just request iStatus with KErrCancel and process that in runl. but if I cancel operation before establishing connection than panic e32user-cbase 46.
rhttpsession is opened and installed but rconnection wasn't started. next I cancel operation, rhttpsession is close (rconnection isn't stopped because didn't start). when application exits runl than e32user-cbase 46 is raised
BTW normally I don't try to share variables between threads. the only are static variables. communication between threads is via requeststatus or rmessage