ListBox.. App. Closed..

[ashish_apj]

Hi,

I want to create a list box in my application. My code is as below:-I have defined the resouce in .rss file as below:-

RESOURCE LISTBOX r_listbox_timer
{
flags = EAknListBoxSelectionList | EAknListBoxViewerFlags;
array_id = r_listbox_timer_items;
}

RESOURCE ARRAY r_listbox_timer_items
{
items =
{
LBUF { txt = "Item1"; },
LBUF { txt = "Item2"; },
LBUF { txt = "Item3"; }
};
}

In View Class, i want to create the list box from resource file as below:-

void CtimerAppView::ConstructL( const TRect& aRect )
{
// Create a window for this application view
CreateWindowL();

//Ashsih list Box Addition:-starts
iListBox = new (ELeave) CAknSingleStyleListBox();

// construct listbox
iListBox->ConstructL(this);

// set container control
iListBox->SetContainerWindowL(*this);

// initialize resource reader, passing resource id as parameter
TResourceReader reader;
TInt resource_id= R_LISTBOX_TIMER; //r_demo_listbox_viewer/*R_DEMO_LISTBOX_VIEWER*/

iEikonEnv->CreateResourceReaderLC(reader,resource_id);

// load and construct the resource

iListBox->ConstructFromResourceL(reader);
CleanupStack::PopAndDestroy(); // rr

//Ashish ListBox Edition Ends

// Set the windows size
SetRect( aRect );

// Activate the window, which makes it ready to be drawn
ActivateL();

}


Compilation is okay, but wheni run my application, it crashes "App. Closed"

Can somebody help me out in resolving the problem...

[symbianyucca]

Could you try running it in the emulator, basically if you put a break point at the start of the code and run it line-by-line you could get the actual line causing the crash.

Also you could try using TRAPs to trap the error code. Then put more information here and maybe somebody could figure out what is causing the crash.

yucca

[Priju Jacob Paul]

also check the listbox example that comes with the FP2 sdk.that would favour you.

Priju

[ashish_apj]

Hi I have checked the example, and to my surprise all things are same...

Well i debug the program and found that its crashing in

iListBox->ConstructFromResourceL()

I checked other forums as well and they suggested to implement thses functions
TInt CountComponentControls() const;
CCoeControl* ComponentControl(TInt aIndex) const;
but after that also, its crashing at same point, in function iListBox->ConstructFromResourceL()

Please suggest what to do?

[Priju Jacob Paul]

What have you got under those functions?
does it return the iListBox under ComponentControl() and 1 under the function CountComponentControls() if you have only listbox as a control in your container.

Please post those functions out here.

Priju

[ashish_apj]

Yes, these functions implement exactly what you have mentioned, please find them as under..

TInt CtimerAppView::CountComponentControls() const
{
return 1; // return number of controls inside this container
}

CCoeControl* CtimerAppView::ComponentControl(TInt aIndex) const
{
switch (aIndex)
{
case 0:
return iListBox;
default:
return NULL;
}
}

[Priju Jacob Paul]

Check this links from wiki forum nokia.

http://wiki.forum.nokia.com/index.ph...simple_listbox

i would ask you to do these:
1) check the format of the contents which you are appending onto the listbox array.
2) Check the error code also. Hope you have enabled the extended panic code and are testing on in the emulator.

Priju

[ashish_apj]

Hi Priju,

Please tell me how to enable "extended panic code". Meanwhile i go through the link you have menitoned.

Thanks
-Ashish

[Priju Jacob Paul]

Just go thru this link.
Extended Panic Code.

Seems like your format of the items are wrong.Check giving it like this.

LBUF { txt = "\tItem1"; },
LBUF { txt = "\tItem2"; },
LBUF { txt = "\tItem3"; }

Just give a try.

Priju

[ashish_apj]

Hi tried with the modified resource you provided the status is same... Application closes.

With extended Panic code enabled, I get the message

App. Closed:
timer
AVKON 6

[Priju Jacob Paul]

Check this link.

http://discussion.forum.nokia.com/fo...d.php?t=104333

Are you doing the same mistake quoted in that thread.

Priju

[ashish_apj]

Hi,

I have tried all, but not able to figure out whats going on....please suggest me wat to do?

[Priju Jacob Paul]

Hello Ashish,
I just tried out your code.

Please make the following changes.

1)
in .rss

RESOURCE ARRAY r_listbox_timer_items
{
items =
{
 LBUF { txt = "\tItem1"; },
 LBUF { txt = "\tItem2"; },
 LBUF { txt = "\tItem3"; }
};
}

2) in your ConstructL,
as you are constructing the listbox from the resource you need not create it dynamically.henceforth comment iListbox->ConstructL().Thats not needed.
3)
Add this in your SizeChanged() function.

iListBox->SetExtent(TPoint(0,0), iListBox->MinimumSize() );

Hope you get it right!

Priju

[ashish_apj]

Thanks Friend,

Finally, I can see the listbox appearing in my application...

-Ashish

[Priju Jacob Paul]

Thanks Friend,

Finally, I can see the listbox appearing in my application...

-Ashish

Good Enough!!!

Priju