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CListView Population is slow (populate with std::string and doubles)

Posted on 2009-04-23
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Last Modified: 2013-11-20
Dear Experts

I am creating an MFC application where one of my document views is a list view. The data I want to populate the list with is a time series, the header row being the name of the series, the first column being times, and the rest of the columns should be filled with data. In some sense this resembles the view in Excel.

My problem is that populating the listview is extremely slow. The code doing that part is:

void CSeriesView::InsertData()
{
      LVITEM lvItem;
      int nItem;
      CListCtrl& m_List = GetListCtrl();

      CSeriesDoc *iDoc = GetDocument();
      unsigned int nr = iDoc->iSeries.timelength();
      unsigned int nc = iDoc->iSeries.serieslength();
      for (unsigned int i=0; i<nr; i++)
      {
            lvItem.mask = LVIF_TEXT;
            lvItem.iItem = i;
            lvItem.iSubItem = 0;
            std::stringstream iS;
            iS << iDoc->iSeries.t(i);
            lvItem.pszText = str2lpstr(iS.str());
            nItem = m_List.InsertItem(&lvItem);

            for (unsigned int j=0; j<nc; j++)
            {
                  double d_ = iDoc->iSeries(i,j);
                  std::string s_ = boost::lexical_cast<std::string,double>(d_);
                  m_List.SetItemText(nItem, j+1, str2lpstr(s_));
            }
      }
}

The iSeries is my time series object, its member function t simply returns the time (boost posix_time) for the current row, str2lpstr is my own function converting a std::string to a lpstr and the boost::lexical_cast is my own clumsy way of converting a double to a std::string.

I guess all this stupid conversion is what slows down my application. But it could of course also be the way I use ListView in general. I hope some of you have an idea or two that would help me out.

Thanks, Peter
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Question by:PeterTokeHedenAhlgren
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Accepted Solution

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Zoppo earned 500 total points
ID: 24216690
Hi PeterTokeHedenAhlgren,

how many rows do you insert into the list? Is it slow even if you don't add really much items? If you insert much more items than visible a significant speed increasement can be reached using the list view as a virtual list control. A description including sample code for this can be found here: http://www.codeguru.com/cpp/controls/listview/data/article.php/c4197/

ZOPPO
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Author Comment

by:PeterTokeHedenAhlgren
ID: 24216999
Ii intend to add >10000 rows. And you are right. Whenever I use a low number of items, speed is all right.

Thanks a lot Zoppo. You are a true "wizard"
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 24217062
:o)

Thanks for the compliment ...

Nice if I could help you.

Have a nice day,

best regards,

ZOPPO
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