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Revision as of 12:33, 22 January 2010 by tanjaluodes (Talk | contribs)

Using an already active connection on Symbian

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Article Metadata
Tested with
Devices(s): Nokia E90 Communicator, Nokia N95
Compatibility
Platform(s): S60 3rd Edition
S60 3rd Edition, FP1
S60 3rd Edition FP2
S60 3rd Edition FP1
S60 3rd Edition (initial release)
Article
Keywords: RHTTPSession, RSocketServ, RConnection, TCommDbConnPref, TConnectionInfoBuf
Created: (15 Feb 2008)
Last edited: tanjaluodes (22 Jan 2010)

Overview

You can use an already active RConnection to establish a connection to the Internet. This saves resources and memory.

RConnection has enumeration of the active connections. The source code finds active connections and attaches to the selected connection via the IAP. If there is no selected active connection, a new one is created. Errors are not handled in the source code.

MMP file

LIBRARY http.lib

LIBRARY ecom.lib

LIBRARY esock.lib

LIBRARY commdb.lib

CAPABILITY NetworkServices


Header file

#include <http.h>
#include <es_sock.h>
#include <commdbconnpref.h>


Source file

// Selected IAP
TInt selectedIap=6;
 
// Open socket server and connection
RHTTPSession session; // TODO: Set to your class member variable
RSocketServ socketServ; // TODO: Set to your class member variable
RConnection connection; // TODO: Set to your class member variable
TCommDbConnPref connPref; // TODO: Set to your class member variable
socketServ.Connect();
connection.Open(iSocketServ);
 
// Search through existing connections.
// If there is already a connection that matches the given IAP, try to attach to
// existing connection.
TBool connected(EFalse);
TConnectionInfoBuf connInfo;
TUint count;
if ( connection.EnumerateConnections(count) == KErrNone )
{
for (TUint i=1; i<=count; i++)
{
// Note: GetConnectionInfo expects 1-based index
if ( connection.GetConnectionInfo( i, connInfo ) == KErrNone )
{
if ( connInfo().iIapId == selectedIap )
{
if ( connection.Attach(connInfo, RConnection::EAttachTypeNormal)
== KErrNone )
{
connected = ETrue;
break;
}
}
}
}
}
 
// Is there an active connection?
if ( !connected )
{
// Could not attach to the existing connection.
// => Start a new connection.
connPref.SetDialogPreference(ECommDbDialogPrefDoNotPrompt);
connPref.SetIapId(selectedIap);
connection.Start(connPref);
}
 
// Open session
session.OpenL();
 
// Set the session's connection info...
RStringPool strPool = session.StringPool();
RHTTPConnectionInfo connInfo = session.ConnectionInfo();
 
// ...to use the socket server
connInfo.SetPropertyL ( strPool.StringF(HTTP::EHttpSocketServ,
RHTTPSession::GetTable() ), THTTPHdrVal (socketServ.Handle()) );
 
// ...to use the connection
connInfo.SetPropertyL ( strPool.StringF(HTTP::EHttpSocketConnection,
RHTTPSession::GetTable() ),
THTTPHdrVal (REINTERPRET_CAST(TInt, &(connection))) );
 
 
 
 
// TODO: Remember to close handles in your class destructor, such as:
CYourClass::~CYourClass()
{
session.Close(); // Close handles in this order
connection.Close();
socketServ.Close();
}

See also

TSS000056 - How can I determine active connections?

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