Linked List

[merry]

Hi all

I m working on Qt3.1(Linux Operating System)
I m creating a linkedlist of items (id,name)
I had created the linked list of items but
I want to display the items of the created linked list in QListBox

How can i ?

Please help

Thanx

[high_flyer]

You could use QListBox::insertItem ( const QString & text, int index = -1 )
where 'text' can be a id+name concated in one QString

[merry]

Thanx for the reply

but it wont works

QListBox::insertItem ( const QString & text, int index = -1 )

'text' can be a id+name concated in one QString

- How?

Actually the items I had taken are char *name , int id

[vermarajeev]

Thanx for the reply

but it wont works


- How?

Actually the items I had taken are char *name , int id

convert char* name to QString like this

QString nameStr(name);

[merry]

Thanx 4 the Reply Mr Rajeev

But where can I convert char into QString;

I m sending you the code pls View this code and tell me the solution

#include <qlistbox.h>
#include <qpushbutton.h>
#include <qstring.h> 
 
 
 
struct list
{
    list * next;
    int id;
   char *name;
} * firstptr ;
 
list *lastptr;
 
 
 
void Form1::create_list() 
{
 
          AppendIntoList(1,"neha");
	  AppendIntoList(2,"jyoti");
	  AppendIntoList(3,"aarti");
	  AppendIntoList(4,"promila");
}
 
 
 
 
void Form1 :: AppendIntoList(int id1,char * name1)
{
    list  * temp;
    if(firstptr==NULL)
    {
	firstptr=new list;
	firstptr->id=id1;
	firstptr->name=name1;
	firstptr->next=NULL;
 
    }
    else
    {
	 lastptr=firstptr ;
	  while(lastptr->next!=NULL)
	  lastptr=lastptr->next;
	  temp=new list;
	  temp->id=id1;
	  temp->name=name1;
	  temp->next=NULL;
	  lastptr->next=temp;
      }
}

#include <qlistbox.h>
#include <qpushbutton.h>
#include <qstring.h> 



struct list
{
    list * next;
    int id;
   char *name;
} * firstptr ;

list *lastptr;



void Form1::create_list() 
{
    
          AppendIntoList(1,"neha");
	  AppendIntoList(2,"jyoti");
	  AppendIntoList(3,"aarti");
	  AppendIntoList(4,"promila");
}




void Form1 :: AppendIntoList(int id1,char * name1)
{
    list  * temp;
    if(firstptr==NULL)
    {
	firstptr=new list;
	firstptr->id=id1;
	firstptr->name=name1;
	firstptr->next=NULL;
	
    }
    else
    {
	 lastptr=firstptr ;
	  while(lastptr->next!=NULL)
	  lastptr=lastptr->next;
	  temp=new list;
	  temp->id=id1;
	  temp->name=name1;
	  temp->next=NULL;
	  lastptr->next=temp;
      }
}

To copy to clipboard, switch view to plain text mode 

Thanx

[high_flyer]

First: it looks like you need first to learn programming with C/C++ in general.
Only then I suggest you should try working with Qt.
Basic casting problems and general C/C++ programming questions might be better suited in the general programming forum.

To the problem:
If there is no reason not to do it, you can change your struct:

struct list
{
list * next;
int id;
QString name;
} * firstptr ;

struct list
{
list * next;
int id;
QString name;
} * firstptr ;

To copy to clipboard, switch view to plain text mode 

This will free you from the need to cast.

If you cant do the above, then in the function where you are puting the items in the listbox you do:

QString strItem = QString::number(list->id);
strItem += " "+list->name;
listBox->insertItem(strItem);

QString strItem = QString::number(list->id);
strItem += " "+list->name;
listBox->insertItem(strItem);

To copy to clipboard, switch view to plain text mode 

P.S
Please use the code qutes for code, not the text quotes, thanks.

[vermarajeev]

Why create linked link when you already have a QPtrList provided by Qt. Is there any particular use????

[merry]

Hi Rajeev

Why create linked link when you already have a QPtrList provided by Qt.

I m new to Qt and learning Qt , So my senior told me that u have to create a linklist of 4 or 5 items and also to show the created linklistt in the listbox. thats why i m using this.

[vermarajeev]

Hi Rajeev


I m new to Qt and learning Qt , So my senior told me that u have to create a linklist of 4 or 5 items and also to show the created linklistt in the listbox. thats why i m using this.

Start learning Qt4.x.x, as Trolltech will stop supporting Qt3.x.x from June. I too have to uninstall Qt3.x.x and start using Qt4...

Thanks

[merry]

Thanx 4 the advice Rajeev

[wysota]

Start learning Qt4.x.x, as Trolltech will stop supporting Qt3.x.x from June.

Trolltech will, but we won't