Handling key events from other windows

[vikhyath]

Hi,

I am interested in trying to pick up all the key events that are produced on the phone, and then check it against a particular key which triggers a function in my application.

I used

iKeyHandle =
CEikonEnv::Static()->RootWin().CaptureKetUpAndDowns(EStdKeyF3,0,0);

and then handled key events in
CSymbian1AppUi::HandleWsEventL (const TWsEvent &aEvent, CCoeControl *aDestination)
{ ...........}

This works fine but I need to pick up events that occur when my application is not in focus, and this is not happening. Can someone give me any suggestions as to why this is not working or how to make it work?

Thanks ,

Vikhyath

[vin2ktalks]

I hope from this thread you may get some idea: Bringing application to foreground.

[vikhyath]

Hi I tried the example from the thread above. I had tried it previously as well, but either the screen stays permanantly with my app in the foreground else it does not pick up keypresses in other apps. I have added comments to the code below:

I would really appreciate help... I am working using series 80 sdk.

Thanks,

Vikhyath

void CSymbian1AppUi::ConstructL()
{
BaseConstructL();

iAppView = CSymbian1AppView::NewL(ClientRect());

AddToStackL(iAppView);


// set application as system application so that it will not be closed by
// system events
CEikonEnv::Static()->SetSystem( ETrue );
// capture red key permanently
iHashKeyHandle = CEikonEnv::Static()->RootWin().CaptureKeyUpAndDowns(EStdKeyHash, 0, 0);

// set application priority to foreground priority even if it goes to background
//This line seems to make no difference
//CEikonEnv::Static()->RootWin().SetOrdinalPosition(0, ECoeWinPriorityAlwaysAtFront);
//with this line, even if i open anoter app, the screen stays with this app
//CEikonEnv::Static()->WsSession().ComputeMode( RWsSession::EPriorityControlDisabled );

//these lines dont do anything
// Make the application a high priority application
CEikonEnv::Static()->RootWin().EnableReceiptOfFocus( ETrue );
CEikonEnv::Static()->RootWin().SetOrdinalPosition(0, ECoeWinPriorityAlwaysAtFront);


}

CSymbian1AppUi::CSymbian1AppUi()
{
// no implementation required
}

CSymbian1AppUi::~CSymbian1AppUi()
{

CEikonEnv::Static()->RootWin().CancelCaptureKeyUpAndDowns(iHashKeyHandle);

if (iAppView)
{
iEikonEnv->RemoveFromStack(iAppView);
delete iAppView;
iAppView = NULL;
}
}

//this function causes this app to stay in foreground even if i open another app.
//void CSymbian1AppUi::HandleForegroundEventL (TBool aForeground)
//{
//// Make the application a high priority application
//if (aForeground)
//{
//CEikonEnv::Static()->RootWin().SetOrdinalPosition(0, ECoeWinPriorityAlwaysAtFront);
//}
//}

// Handle Key Events in this
void CSymbian1AppUi::HandleWsEventL (const TWsEvent &aEvent, CCoeControl *aDestination)
{
if (aEvent.Type() == EEventKey)
{
// This is for switching back to Application when Hash key is pressed
if (EStdKeyHash == aEvent.Key()->iScanCode && EEventKey == aEvent.Type())
{
TApaTask task(iEikonEnv->WsSession());
task.SetWgId(CEikonEnv::Static()->RootWin().Identifier());
task.BringToForeground();
return;
}
}
CEikAppUi::HandleWsEventL(aEvent, aDestination);

}

[vin2ktalks]

Which is your SDK version?

[vikhyath]

Symbian 7.0S - Series 80. I am also testing on a Nokia 9500 phone.

THanks,

Vik

[xhsoldier]

Only focus windows or apps has the ability to receive the keyevent.

but for hot key event, it can be received even if your app is not on focus.
I think,

[vin2ktalks]

Symbian 7.0S - Series 80. I am also testing on a Nokia 9500 phone.

THanks,

Vik

I my self tested the above given link's code with 3rd Ed and 2.6, 2.8 version of SDK and was working fine. I never try with 2.0.

[vikhyath]

The only line that changed was
CEikAppUi::HandleWsEventL(aEvent, aDestination);

in your version it was CAknAppUi.... Other than that all the functions are supported.....

Is there any other way of ensuring hte application picks up keypresses?

Thanks,

Vik

[vin2ktalks]

Check these API's with SDK RWindowGroup::CaptureKey(), RWindowGroup::CancelCaptureKey. And here you've an example of the same.