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CListCtrl sorting ...

Posted on 1997-03-10
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Last Modified: 2008-03-03
how do I set up a list control to allow simle alphanumeric
sorting when the column title button is clicked .

i.e. Just like the windows explorer columns.

Should I be using the more simpler CViewList.?
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Question by:georgeo
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MFCGuy earned 50 total points
ID: 1161899
First, set up your ListCtrl rows to have an LParam (SetItemData()) that means something for the sort
like a pointer to the object you want to sort on.
I used an object in the example below.

Insert the following code:

in .h
-----
static int CALLBACK ListCtrlCompareProc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);

in .cpp
-------
int CALLBACK CODListCtrl::ListCtrlCompareProc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
{
      //If LPARAMs are invalid, return 0 (sort items are equal)
      if(lParam1 == 0 || lParam2 == 0)
            return 0;
        int column = (int) lParamSort;

      CMyObject* s1 = (CMyObject*)lParam1;
      CMyObject* s2 = (CMyObject*)lParam2;
//I'm only sorting column 0 here...
        if(column == 0)      //default - compare as CStrings
             return s1->m_aString.Compare(s2->m_aString);
        return 0;//rows matched
}

Call the function in your .cpp when the user clicks on a column
by using:
CListCtrl::SortItems(ListCtrlCompareProc, <the column that was sorted on>);

This will sort in ascending order.

Hope that gave you enough to get you going...

Regards,
MFCGuy
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