List Box Problem

[amitaggarwal]

m facing a problem in reading a selected value from List Box.

I have created a list box from Resource( .rss file).

I actually have put it on a Dialog.

This is the code i write on OkToExitL() method of the dialog.
----------------------------------------------------------------------------
/ Get a pointer to the control.
CCoeControl* myListBoxPtr = this->Control(EListBoxId);

// Downcast the returned CCoeControl* pointer to the correct type.
CEikTextListBox* myListBox = static_cast<CEikTextListBox*>( myListBoxPtr);

TInt selectedIndex= myListBox->CurrentItemIndex();

CTextListBoxModel* iModel= myListBox->Model();

TPtrC a=iModel->ItemText(selectedIndex);
----------------------------------------------------------------------------

But it fails the compile process and this is the error .

Error : illegal use of incomplete struct/union/class 'CTextListBoxModel'
ClockDlg.cpp line 220

Error : Compile failed

What can be the problem......

[symbianyucca]

have you included header file that defines the CTextListBoxModel in your ClockDlg.cpp file.

yucca

[amitaggarwal]

Thanks Yucca .May be that was the problem .It is passing the compile test now ..

But i have never had such a type of error if u miss the header class.

May be thats why i was struck with it as i thought it cannot be header related error.

Thanks once again

[nishantanindya]

hello Mr. symbianyucca
This is my program from which i want to create list box without using resource....

void Cview_list::ConstructL()
{
iListBox = new (ELeave) CAknSingleNumberStyleListBox();//CAknSingleNumberStyleListBox(); // markableCEikTextListBox();//
// Construct listbox
iListBox->ConstructL(this, EAknListBoxSelectionList | EAknListBoxLoopScrolling );
iListBox->SetContainerWindowL( *this );
// Set scrollbars
iListBox->CreateScrollBarFrameL( ETrue );
iListBox->ScrollBarFrame()->SetScrollBarVisibilityL( CEikScrollBarFrame::EOn, CEikScrollBarFrame::EAuto );

// Create listbox item array
iListBoxItems = new (ELeave) CDesCArrayFlat(4);
// Create listbox items
iListBoxItems->AppendL( _L("1\tItem") );
iListBoxItems->AppendL( _L("2\tItem") );
iListBoxItems->AppendL( _L("3\tItem") );
// Add items to listbox
iListBox->Model()->SetItemTextArray( iListBoxItems );
// Listbox deletes the item array
iListBox->Model()->SetOwnershipType( ELbmOwnsItemArray );
iListBox->HandleItemAdditionL( );
// Activate Listbox
iListBox->SetRect( Rect() );
iListBox->ActivateL();

}
void Cview_list::SizeChanged()
{
iListBox->SetRect( Rect() );
}

but i am getting errors like

illegal use of incomplete struct/union/class 'CTextListBoxModel'

undefined identifier 'CAknSingleNumberStyleListBox'

undefined identifier 'EAknListBoxSelectionList'

illegal use of incomplete struct/union/class 'CTextListBoxModel'
kindly let me know what am i missing???
thank you.

Nishant

[vineet.jain]

Search for all these classes in SDK & include their corresponding headers/libs in your cpp/mmp file.

[nishantanindya]

thanks Vineet.
I got it
i forgot to add aknlist.h
but now there is new problem..
my program is crashing now.....
please help me.
Thanks..

[wizard_hu_]

Check the panic code, http://www.developer.nokia.com/Commu...ded_panic_code
You can find a short, resource-less listbox example in http://www.developer.nokia.com/Commu...m-with-ListBox

[nishantanindya]

Thanks wizard_hu_

i am able to create list box but now i am not able to scroll it by up arrow key or down arrow key...
is something am i missing??
kindly tell me..
thanks

[vineet.jain]

You already have implemented OfferKeyEventL()? Wiki has number of articles on how to create listbox etc. ,you should have tried searching them, just like this one :

http://www.developer.nokia.com/Commu...st_box_example

[nishantanindya]

Hi vineet
my code is as follows
for creating listbox
void Cview_list::ConstructL(const TRect& aRect)
{
CreateWindowL();
iListBox = new (ELeave) CAknSingleNumberStyleListBox();//CAknSingleNumberStyleListBox(); // markableCEikTextListBox();//
// Construct listbox
iListBox->ConstructL(this, EAknListBoxSelectionList|EAknListBoxLoopScrolling );
iListBox->SetContainerWindowL( *this );
// Set scrollbars
iListBox->CreateScrollBarFrameL( ETrue );
iListBox->ScrollBarFrame()->SetScrollBarVisibilityL( CEikScrollBarFrame::EOn, CEikScrollBarFrame::EAuto );

// Create listbox item array
iListBoxItems = new (ELeave) CDesCArrayFlat(4);
// Create listbox items

iListBoxItems->AppendL( _L("0\tOneItem1\t") );
iListBoxItems->AppendL( _L("0\ttwoItem2\t") );
iListBoxItems->AppendL( _L("0\tthreeItem3\t") );
iListBoxItems->AppendL( _L("0\tfourItem4\t") );
//iListBox->SetCurrentItemIndex(1);
// Add items to listbox
iListBox->Model()->SetItemTextArray( iListBoxItems );
// Listbox deletes the item array
iListBox->Model()->SetOwnershipType( ELbmOwnsItemArray );
iListBox->CreateScrollBarFrameL(ETrue);
iListBox->ScrollBarFrame()->SetScrollBarVisibilityL(CEikScrollBarFrame::EOff,CEikScrollBarFrame::EAuto);
SetRect(aRect);
ActivateL();


and offerkey's part as follows
TKeyResponse Cview_list::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)
{

if(aType != EEventKey)
{
return EKeyWasNotConsumed;
}
switch(aKeyEvent.iCode)
{
case EKeyUpArrow:
case EKeyDownArrow:
{
// Forward up and down key press events to the list box
return iListBox->OfferKeyEventL( aKeyEvent, aType );
}
default:
break;
}
return EKeyWasNotConsumed;
}
and i dont know what should i do??
list box is created but i cant scroll it by down arrow key...

[vineet.jain]

Did you added the view in which this listbox is created to stack inside the DoActivateL() ?


void CYourView::DoActivateL( const TVwsViewId& /*aPrevViewId*/,
TUid /*aCustomMessageId*/,
const TDesC8& /*aCustomMessage*/ )
{

iContainer = Cview_list::NewL(aRect, *this);
iContainer->SetMopParent(this);
AppUi()->AddToStackL(*this, iContainer);
}

or if you are activating this view directly from AppUi then:

AddToStackL(iView); // where iView is Cview_list*iView

[nishantanindya]

thanks its working...

[nishantanindya]

hi vineet..

I have 2 classes suppose
class A and class b
in class A..
CDesCArrayFlat* iListBoxItems;
and in class B..
CDesCArrayFlat* iListBoxItems2;
I want to copy iListBoxItems into iListBoxItems2..
with some appended data..
How can I do it...


_LIT(x,"1\t");
_LIT(y,"\t");
TBuf<500> text;
for(TInt i=0;i<4;i++)
{
text.Append(x);
iListBoxItems->AppendL(text);
iListBoxItems->AppendL( iappview->MyArray ->operator[](i));
text.Append(y);
iListBoxItems->AppendL(text);
text.Append(y);
}

[nishantanindya]

But when I reach at
iListBoxItems->AppendL( iappview->MyArray ->operator[](i));
my program crashes....

[pooja_1650]

But when I reach at
iListBoxItems->AppendL( iappview->MyArray ->operator[](i));
my program crashes....

You should see the panic code from here.