Labels

[zohirey2]

here my application is GUI with UI designer

i put a lable in the form
and its name is label1

and in handling a menu option command i write this code


label1->SetText(_L("Mohamed Is in Love and Not!!"));

but compiler give me this error


undefined identifier 'label1'
what is the problem?

[kiran10182]

undefined identifier 'label1'
what is the problem?

Problem lies in your description itself. Make sure that label1 is defined in the context you are trying to use.

[zohirey2]

OK i am sure of this
but how can i solve it

[kiran10182]

OK i am sure of this
but how can i solve it

But complier is aways right, generally. It says that label1 is undefined and so it would be. Can you show where did you declare label1 in your code?

[tamhanna]

Did you define label1 where? Just in Carbide.ui?

We need more info. In what context is this call?

[zohirey2]

i haven't declare label1 any where!
i am sorry i forget to mention this
where i have to declare it

[stavrospapa]

hi!

if you have used the GUI to place a label,
then search in class your_appContainer.cpp
(the variable should be iLabel1)

If you have used the options menu to change the label's text,
then you need to define a new method (i.e., changeText())
in your_appContainer.cpp to be called by your_appContainerView.cpp
at the event handler method.

hope that helps!
Stavros

[zohirey2]

Did you define label1 where? Just in Carbide.ui?

We need more info. In what context is this call?

i have make a method
called
void ChangeText();
and put it in applicationContainer.h
and make the following defination in applicationContainer.cpp

void ChangeText(const TRect& aRect)
{
label1->SetTextL(aRect);

}
in applicationVontainerView


_LIT(x,"Mohamed is not happy");
label1->ChangeText(x);

but it tell me that
label1 is undefined

i try instate of label1 using iLabel1

but i face the same problem

[wizard_hu_]

May I ask why you think that 'label1' should exist?
It is not even clear if you are really talking about a form (CAknForm, lines containing heading and some kind of editor) or an empty page.
Have you considered reading the code prior to modifying it? If you check the header file for the view/container, and search for the word label in it, you will quickly find if there is a label at all, and if it exists, you will find its name.

[savaj]

i have make a method
called
void ChangeText();
and put it in applicationContainer.h
and make the following defination in applicationContainer.cpp

void ChangeText(const TRect& aRect)
{
label1->SetTextL(aRect);

}
in applicationVontainerView


_LIT(x,"Mohamed is not happy");
label1->ChangeText(x);

but it tell me that
label1 is undefined

i try instate of label1 using iLabel1

but i face the same problem

Have you declared label1 in your applicationContainer.h ??? Do you know the meaning of TRect ??? Even if you declare and instantiate label1 the statement "label1->SetTextL(aRect)" will not compile.

I suggest you to once go through following article to create label in your container.
http://wiki.forum.nokia.com/index.ph...o_create_Label

[zohirey2]

Have you declared label1 in your applicationContainer.h ??? Do you know the meaning of TRect ??? Even if you declare and instantiate label1 the statement "label1->SetTextL(aRect)" will not compile.

I suggest you to once go through following article to create label in your container.
http://wiki.forum.nokia.com/index.ph...o_create_Label

very good
but i am using UI Designer
i mean that i place a label from tool box
where should i declare it

[kiran10182]

very good
but i am using UI Designer
i mean that i place a label from tool box
where should i declare it

When you drag-drop controls(label) from UI designer, it will show as lable1, label2 etc... When you save the UI design, Carbide.c++ IDE will add iLabel1 in your *Container.h and *Container.cpp files.

So you need to play with iLabel1 instead of label1. Try with adding one more label from UI designer and after saving it see the corresponding changes in your *Container.h/cpp files.

void ChangeText(const TDesC& aText) //Because you need to pass text, not Rect, ideally
{
     iLabel1->SetTextL(aText);

}

I hope this helps.

[zohirey2]

When you drag-drop controls(label) from UI designer, it will show as lable1, label2 etc... When you save the UI design, Carbide.c++ IDE will add iLabel1 in your *Container.h and *Container.cpp files.

So you need to play with iLabel1 instead of label1. Try with adding one more label from UI designer and after saving it see the corresponding changes in your *Container.h/cpp files.

void ChangeText(const TDesC& aText) //Because you need to pass text, not Rect, ideally
{
     iLabel1->SetTextL(aText);

}

I hope this helps.

thank you so much
you understand me very good
but
let me want to change the text of label in selecting the first choice of options
do i need to implement the function SetText()
and if so
where to declare it .h
and how to call it in the event

i am sorry for being stupid a lot!

[savaj]

thank you so much
you understand me very good
but
let me want to change the text of label in selecting the first choice of options
do i need to implement the function SetText()
and if so
where to declare it .h
and how to call it in the event

i am sorry for being stupid a lot!

1) declare/define function (say ChangeText()) in container.
2) declare/define function (say ChangeText()) in containerview (if you have).
3) call ContainerView::ChangeText() from Appui::HandleCommandL()
4) call Container::ChangeText() from ContainerView::ChangeText()
4) set text in your label in Container::ChangeText()

Hope this will help you.

[kiran10182]

1) declare/define function (say ChangeText()) in container.
2) declare/define function (say ChangeText()) in containerview (if you have).
3) call ContainerView::ChangeText() from Appui::HandleCommandL()
4) call Container::ChangeText() from ContainerView::ChangeText()
4) set text in your label in Container::ChangeText()

Hope this will help you.

To avoid these, people are using Carbide.c++ with UI Designer. It is a matter of drag and drop.

@zohirey2: You can add menu options from UI designer itself. Go to UI designer and under Label control, you will find Menu->Menu bar. Drag and drop that menu bar on the screen and add whatever option command you want. Say Change Label. It will generate corresponding entries in your application.

Then in your AppUI class -> Under HandleCommandL function, add following code:

void CUIDesignerTestAppUi::HandleCommandL( TInt aCommand )
{
...
....
...
....
  if ( !commandHandled ) 
  {
	switch ( aCommand )
	{ 
	case EUIDesignerTestAppUiChange_LabelMenuItemCommand: // This is from .hrh file.
	iUIDesignerTestContainer->ChangeTextL(_L("Hi there"));
                break;
	default:
		break;
	}
  }
}

PS: There might be an easier way than this which I am unaware of.