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8.6

Display of rows in a listview common control (win32 )

Asked by pascal_lalonde in Windows ATL / WTL / COM Programming, Windows Programming, C++ Programming Language

Tags: listview control win32 WM_NOTIFY

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!

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             //-----------------------------------------------------------
// 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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Display of rows in a listview common control (win32 )

Asked by pascal_lalonde in Windows ATL / WTL / COM Programming, Windows Programming, C++ Programming Language

Tags: listview control win32 WM_NOTIFY

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