How to capture any key pressed or Screen is touched for touch screen in Non UI app

[waziz40]

Hello Friends

How to get event/notification for any key press or screen is touched in Non UI application.

Please suggest some links or piece of code.

[wizard_hu_]

"Any" is not really possible, but you can use CaptureKey for getting keypresses when your application is not visible (either non-GUI or GUI). Search for it in the Wiki, and you can find a really simple test code in http://www.developer.nokia.com/Commu...is-key-capture, which may help in understanding the Wiki example too.
Capturing screen touches is not really supported as I know. You can experiment having some top-priority invisible window, but it is not trivial at least.

[waziz40]

Hi Wizard

I have displayed an image using exact code at http://www.developer.nokia.com/Commu...tion_framework. I want to capture pointer events when displayed image is at top.

is it possibly in this scenario.

Note: I am not using any custom control.

[waziz40]

Friends,

I have to capture pointer events in the following Scenario.

1.In a NON UI application i have displayed an image.

2. I need to be notified when user touches the screen so that i can remove/close image.

For reference i have pasted the code i am using to display an image

#include <apgwgnam.h> //CApaWindowGroupName
#include "WindowDrawer.h"
#include <coedef.h> //for ECoeWinPriorityAlwaysAtFront

CWindowDrawer* CWindowDrawer::NewL(void)
{
CWindowDrawer* self = CWindowDrawer::NewLC(void);
CleanupStack::Pop(self);
return self;
}


CWindowDrawer* CWindowDrawer::NewLC(void)
{
CWindowDrawer* self = new (ELeave) CWindowDrawer(void);
CleanupStack::PushL(self);
self->ConstructL();
return self;
}

// the active object priority should be relatively low
CWindowDrawer::CWindowDrawer(void):CActive(EPriorityLow)
{
}

CWindowDrawer::~CWindowDrawer()
{
Cancel();

if(iMyFont)
{
iScreenDevice->ReleaseFont(iMyFont);
iMyFont = NULL;
}

delete iWindowGc;
iWindowGc = NULL;
delete iScreenDevice;
iScreenDevice = NULL;

iWindow.Close();

iWindowGroup.Close();
iWsSession.Close();
}

void CWindowDrawer::ConstructL(void)
{
CActiveScheduler::Add(this);

User::LeaveIfError(iWsSession.Connect());

iScreenDevice=new (ELeave) CWsScreenDevice(iWsSession);
User::LeaveIfError(iScreenDevice->Construct());
User::LeaveIfError(iScreenDevice->CreateContext(iWindowGc));

TFontSpec MyeFontSpec (KFontArial, 12*15);
MyeFontSpec.iTypeface.SetIsProportional(ETrue);
User::LeaveIfError(iScreenDevice->GetNearestFontInTwips(iMyFont,MyeFontSpec));

iWindowGroup=RWindowGroup(iWsSession);
User::LeaveIfError(iWindowGroup.Construct((TUint32)&iWindowGroup, EFalse));
// iWindowGroup.SetOrdinalPosition(0,ECoeWinPriorityNormal);
iWindowGroup.SetOrdinalPosition(0,ECoeWinPriorityAlwaysAtFront);
iWindowGroup.EnableReceiptOfFocus(EFalse);

CApaWindowGroupName* winGroupName=CApaWindowGroupName::NewLC(iWsSession);
winGroupName->SetHidden(ETrue);
winGroupName->SetWindowGroupName(iWindowGroup);
CleanupStack::PopAndDestroy();

iWindow=RWindow(iWsSession);
User::LeaveIfError(iWindow.Construct(iWindowGroup, (TUint32)&iWindow));

TPixelsTwipsAndRotation SizeAndRotation;
iScreenDevice->GetDefaultScreenSizeAndRotation(SizeAndRotation);

iWindow.Activate();
iWindow.SetExtent(TPoint(0,0),SizeAndRotation.iPixelSize);
iWindow.SetBackgroundColor(KRgbBlue);
// iWindow.SetOrdinalPosition(0,ECoeWinPriorityNormal);
iWindow.SetOrdinalPosition(0, ECoeWinPriorityAlwaysAtFront);
iWindow.SetNonFading(ETrue);
iWindow.SetVisible(ETrue);

Draw();
iWsSession.RedrawReady(&iStatus);
SetActive();
}

void CWindowDrawer::RunL()
{
if (iStatus != KErrCancel)
{
TWsRedrawEvent e;
iWsSession.GetRedraw(e);

// if Windows Server does not want a redraw the window handle is 0
if (e.Handle() != 0)
{
// draw our only window
Draw();
}

iWsSession.RedrawReady(&iStatus);
SetActive();
}
}

void CWindowDrawer::Draw(void)
{
iWindowGc->Activate(iWindow);

TRect DrwRect(TPoint(0,0), iWindow.Size());

iWindow.Invalidate(DrwRect);
iWindow.BeginRedraw();
iWindowGc->Clear(DrwRect);

if(iMyFont)
{
iWindowGc->UseFont(iMyFont);

TInt StartY ((DrwRect.Height() - iMyFont->HeightInPixels()) / 2);

iWindowGc->DrawText(KtxHelloThere,TRect(0,StartY,DrwRect.Width(),(StartY + iMyFont->HeightInPixels())),iMyFont->AscentInPixels(), CGraphicsContext::ECenter, 0);
}

iWindow.EndRedraw();

iWindowGc->Deactivate();
iWsSession.Flush();
}

void CWindowDrawer::DoCancel()
{
iWsSession.RedrawReadyCancel();
}

[wizard_hu_]

Pointer events are just simple Window Server events. You can get Window Server events via RWsSession::EventReady+GetEvent.
Note that this is not called capturing, that is why it may work without any wild hack.

[waziz40]

Thnx i could get pointer events successfully.

What if i want to receive key press events in addition to pointer events? What should i do to receive any key press event.

[wizard_hu_]

If your window is focused, keypresses are WS events too.
If your window is not focused, CaptureKey, as suggested in #2 already.

[waziz40]

Is there any way to disable all notification programatically

[wizard_hu_]

"All"? Probably there is no way for that.

[waziz40]

actaully some of applications are hiding or managed to disable "Data packet connectio onhold/active" notification, low charging and charger plug in. May hide atleast these three notifications

1. Packet data connection on hold

2. Charging is low.

3. Notification while we plugin charger

[waziz40]

Hi again.

I have been facing a strange issue.

I could successsfully display an image over call buble. After fresh installation of my application on Nokia 5800. I could display image as many times as i call. Butttttttttt when i restart phone then i could never display image rather application crashes.

Please suggest what should i do?
For reference i have already posted my code plz see in #4.