CAknSelectionListDialog causes panic: "USER: 0".

[jonas_h]

Hi.

I have a little problem, I have asked Google :) and searched in this forum, but havn't found anything that have helped. So, now I'm hoping that you can give me an answer, or a hint.

I want to create a listbox dialog, using CAknSelectionListDialog. But when I run the application I get an "USER: 0"-panic. I figured out that it crashes inside RunLD(). But I don't know what causes it.

This is the code (it's inside a static function):

...
/**
 * @Param:  Void.
 * @Return: TInt.
 * @Access: Public.
 */
TInt
CContactItems::ShowAdd2GrpDialog(void)
{
	CAknSelectionListDialog *dlg_obj;
	CDesCArray              *arr_obj;
	TInt                     index;
	TInt                     ret;

		arr_obj = NULL;
		arr_obj = new (ELeave ) CDesCArrayFlat(4);
		if (arr_obj == NULL)
			return(-2);

		TBuf<32> buff;
		for (index = 0; index < 4; index++) {
			buff.Format(_L("0\tITEM_%02d"), index);
			arr_obj->AppendL(buff);
		}

		index = 0;
		dlg_obj = NULL;
		dlg_obj = CAknSelectionListDialog::NewL(index, arr_obj, 0);
		if (dlg_obj == NULL)
			return(-1);

		ret = -1;
		dlg_obj->PrepareLC(R_LISTBOX_DLG);
		ret = dlg_obj->RunLD();

	return ret;
}
...

And this is the resource:

RESOURCE DIALOG r_listbox_dlg
{
	flags = EAknDialogSelectionList | EEikDialogFlagWait;
	buttons = R_AVKON_SOFTKEYS_SELECT_CANCEL;
	items = {
		DLG_LINE {
			type = EAknCtSingleListBox;
			id = EListboxDlgHandle01;
			control = LISTBOX {
				flags = EAknListBoxSelectionList;
			};
		}
	};
}

I hope that you can help me.
Regards,
Jonas.

[Shilpa13]

This is explanation for USER 0

This panic is raised when a thread calls User::Invariant().

Typically, User::Invariant() is called when a test for a class invariant fails, i.e. when a test which checks that the internal data of an object is self-consistent, fails.

Check the design and implementation of your class.

[rishiak]

Hi,

You need to pass the menubar in the CAknSelectionListDialog::NewL() as the third argument.

This menubar will be used by the dialog itself.
RESOURCE MENU_BAR r_res_id_for_a_menubar { titles = { MENU_TITLE { menu_pane = R_AVKON_MENUPANE_SELECTION_LIST; } }; };



Regards,

rishiak

[jonas_h]

Thanks for your replys.
I tried to add a menu, as a third parameter. But it didn't work, I still get the same panic.
Do I have to create this dialog in a special class, for instance in AppUi or a View?

[rishiak]

Hi jonas_h
Your code looks ok to me, Did you check the id in the resourcein DLG_LINE, it should not duplicate with other control id.

Regards,

rishiak

[navjotsingh1979]

Hi Jonas ,

where is this id = EListboxDlgHandle01; defined ,

i mean this constant 'EListboxDlgHandle01'

i was trying to execute this code pasted by you !!!


Regards
NEO'

[Bernd42]

It might be a bit late, but maybe it is helpfule for someone who is using the search function.

You have to use

id = ESelectionListControl;

instead of

id = EListboxDlgHandle01;

It seems CAknSelectionListDialog is looking for the predefined IDs to find the controls. If you use your own IDs, the controls cannot be found and so it is assumed that th data is corrupt.

Bernd