Question

Display of rows in a listview common control (win32 )

Asked by: pascal_lalonde

Hello Experts,


  I am using Win32 api, Visual Studio C++ 2008. I created a parent window and I added a listview common control in it. I wrote the function the parent uses to handle the WM_NOTIFY messages originating from one of the controls of the parent window (it can be the listview or another one).

This said, the function DoNotifyItemBtnWnd() is called many times and many times the listview is the sender of the message. I see the columns but not the rows containing the data. Why?

By the way the variable needUpdate is initialized true and NB_ROWS == 5 and the hWndListView is correct.

Thank you!

//-----------------------------------------------------------
// DoNotifyItemBtnWnd - Process WM_NOTIFY message for window.
//
LRESULT DoNotifyItemBtnWnd (HWND hWnd, UINT wMsg,
                            WPARAM wParam, LPARAM lParam) {
  LVITEM lvI;
 
  if(((LPNMHDR) lParam)->idFrom == ID_LISTVIEW)
  {
    if (needUpdate == true){
	needUpdate = false;
	for (int rows = 0; rows < NB_ROWS; rows++)
	{
         	  lvI.mask = LVIF_PARAM;
	  lvI.iItem = rows;
	  lvI.iSubItem = 0;
	  lvI.lParam = (LPARAM) &dataToDisplay[rows];
	  if(ListView_InsertItem(hWndListView, &lvI)  -1){
		return -1;
   	  }
	}
    }
  }
 
  return 0;
}
                                  
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Asked On
2009-11-02 at 14:45:15ID24865570
Tags

listview control win32 WM_NOTIFY

Topics

Windows ATL / WTL / COM Programming

,

Windows Programming

,

C++ Programming Language

Participating Experts
2
Points
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Comments
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Answers

 

by: alb66Posted on 2009-11-02 at 23:56:21ID: 25726789

Try to add also a text to you items:

          lvI.mask = LVIF_PARAM|LVIF_TEXT;
          lvI.iItem = rows;
          lvI.iSubItem = 0;
          lvI.pszText  = "Hello!";
          lvI.lParam = (LPARAM) &dataToDisplay[rows];

 

by: itsmeandnobodyelsePosted on 2009-11-03 at 06:55:42ID: 25729498

To add to above comment:

The ListView_InsertItem would only insert a new row if the lvI.iItem is less than the number of rows currently contained by the list control.

So, the above notification is a one-time notification to initially filling the list. Or you have to clear the list before notification.

IMO, none of these is an action which a notification handler should perform ?

 

by: pascal_lalondePosted on 2009-11-03 at 07:12:31ID: 25729677

Yes the "Hello" is displayed in the first column (1st of five columns). Why is this displayed but not my dataToDisplay struct?
Fyi

typedef struct dataLV{
      WCHAR column1[120];
      WCHAR column2[120];
      WCHAR column3[120];
      WCHAR column4[120];
      WCHAR column5[120];
}dataLV;



dataLV dataToDisplay[NB_ROWS] = {{TEXT("pascal"), TEXT("pascal"), TEXT("pascal"), TEXT("pascal"), TEXT("pascal")},
{TEXT("Danny"), TEXT("Danny"), TEXT("Danny"), TEXT("Danny"), TEXT("Danny")},
{TEXT("Teddy"), TEXT("Teddy"), TEXT("Teddy"), TEXT("Teddy"), TEXT("Teddy")},
{TEXT("Julie"), TEXT("Julie"), TEXT("Julie"), TEXT("Julie"), TEXT("Julie")},
{TEXT("Georges"), TEXT("Georges"), TEXT("Georges"), TEXT("Georges"), TEXT("Georges")}};

 

by: alb66Posted on 2009-11-03 at 07:18:53ID: 25729733

You need to set the subitems...

       for (int row = 0; row < NB_ROWS; row++)
       {
           for ( int col = 0: col <5; col++ )
           {
              lvI.mask = LVIF_TEXT;
              lvI.iItem = row;
              lvI.iSubItem = col;
              lvI.pszText  = dataLV[rows][cols];
                 
              ListView_InsertItem(hWndListView, &lvI);
          }
       }

 

by: pascal_lalondePosted on 2009-11-03 at 08:03:42ID: 25730302

It works partially. The name Pascal only appears in the the first column of the first row. Also the
ListView_InsertItem() returns -1.

I must say that before I try to insert items inside the control, I only created the column headers. Do I also need to create the columns before (ie 5 columns of 5 rows each because dataLV has 5 rows)?

Thank you!

 

by: itsmeandnobodyelsePosted on 2009-11-03 at 08:07:08ID: 25730353

The ListView_InsertItem(hWndListView, &lvI); only would create the row and add column 0. For subitems (column) 1 to 5 you need to call ListView_SetItem.

 

by: itsmeandnobodyelsePosted on 2009-11-03 at 08:11:06ID: 25730401

So you need:
 
     for (int row = 0; row < NB_ROWS; row++)
       {
            lvI.mask = LVIF_TEXT;
            lvI.iItem = row;
            lvI.iSubItem = 0;
            lvI.pszText  = dataLV[row][col];
           for ( int col = 1; col <5; col++ )
           {
              lvI.iSubItem = col;
              lvI.pszText  = dataLV[row][col];
                 
              ListView_SetItem(hWndListView, &lvI);
          }
       }

Note, I changed the indices for dataLV and also removed a typo in the inner for statement. You better would copy/paste code snippets rather than retyping them.

 

by: itsmeandnobodyelsePosted on 2009-11-03 at 08:13:26ID: 25730431

Should be

      lvI.pszText  = dataLV[row][0];
      ListView_InsertItem(hWndListView, &lvI);
      for ( int col = 1; col <5; col++ )

 

by: pascal_lalondePosted on 2009-11-03 at 09:05:57ID: 25731055

The code in comment 25730401 works well. But if I want to insert (or add) a whole row how will I do it?
Is it by using something like:


  for (int row = 0; row < NB_ROWS; row++)
  {
     lvI.mask = LVIF_PARAM;
     lvI.iItem = row;
     lvI.iSubItem = 0;
     lvI.lParam = (LPARAM)&dataToDisplay[rows];
     ListView_SetItem(hWndListView, &lvI); // or ListView-InsertItem(....
}

 

by: itsmeandnobodyelsePosted on 2009-11-03 at 09:43:36ID: 25731469

See code below.

     for (int row = 0; row < NB_ROWS; row++)
       {
            lvI.mask = LVIF_TEXT | LVIF_PARAM;
            lvI.iItem = row;
            lvI.iSubItem = 0;
            lvI.pszText  = dataLV[row][0];
            lvI.lParam = (LPARAM)&dataToDisplay[rows];
            // insert a new row and the text of first column
            ListView_InsertItem(hWndListView, &lvI); 
            // set text for additional columns
            for ( int col = 1; col <5; col++ )
            {
              lvI.mask = LVIF_TEXT; 
              lvI.iSubItem = col;
              lvI.pszText  = dataLV[row][col];
                  
              ListView_SetItem(hWndListView, &lvI);
          }
       }
                                              
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by: pascal_lalondePosted on 2009-11-03 at 10:03:44ID: 25731682

The comment #25731469 add nothing to the code in the comment 25730401 but an useless instruction
(          lvI.lParam = (LPARAM)&dataToDisplay[rows];  ).

I dont want to add each column one by one (so no lvI.pszText and no LVIF_TEXT).

 

by: pascal_lalondePosted on 2009-11-03 at 11:08:29ID: 25732332

Thank you! This said can you find an answer to comment #25731682?

 

by: itsmeandnobodyelsePosted on 2009-11-03 at 11:48:40ID: 25732758

>>>> lvI.lParam = (LPARAM)&dataToDisplay[rows];
Those statements are very useful. Assume the user sorts the list by clicking on a column header. Then the initial order got lost and the *param* you passed to the row when creating it might be the only identification of the row. There is no alternative beside the values of the columns would provide a unique identification.

>>>> add nothing to the code in the comment 25730401 but an useless instruction
It was posted by you in #25731055 and I thought you needed it.

>>>> I dont want to add each column one by one
Unfortunately there is no way other to insert/set each cell in the list control.

But of course you could put the inner loop to a function where you pass the dataLV[row] and finally have like

     for (int row = 0; row < NB_ROWS; row++)
     {
           insertRow(hWndListView, row, dataLV[row]);
     }


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