如何遍历 CListCtrl 的元素？

Question

简要说明：
I got an instance of CTreectrl class where objects are stored, when an object is selected corresponding list report for that object is displayed.
我需要调整从CListCtrl 派生的 MyListCtrl 类实例的列宽，以便用户可以在不调整列大小的情况下看到该列中的数据。

我如何处理我的任务：
我实现了从树中选择对象时调用的方法 InitColumnWidth

    void COwnListCtrl::InitColumnWidth ( unsigned const * defwidth, BOOL chars )
        {
            /* find the largest string in each column and set column width accordingly
            so that user no longer need to manually adjust columns width */

            RECT r;
            GetClientRect ( & r );
            int* arrOfMaxColumnWidth = new int[NumCol]; // array where max length for columns will be stored
            for (int i = 0; i < NumCol; ++i)
                arrOfMaxColumnWidth[i] = 0; // initialize
            tstring dataInColumn;
            double Scale = ( defwidth && chars ) ? GetCharAveWidth ( * GetFont () ) : ( r.right * 0.01 );
            int numberOfVisitedItems = 0;
            do
            {
                dataInColumn = _T(""); // initialize
                for (int col = 0; col < NumCol; ++col)
                {
                    //DWORD const itemData = this->GetItemData(numberOfVisitedItems);

                    dataInColumn = this->GetSubItemString(this->GetItemData(numberOfVisitedItems), col); 
                /* 1-st varaint returns only first row of the list 
           because GetItemData always returns zero, but I need to visit all rows */
                    dataInColumn = this->GetSubItemString(numberOfVisitedItems, col); 
   /* 2-nd variant, works for most objects from CTreeCtrl, but for a few of them assertion is raised, system reports on the corrupted heap and application terminates*/
                    if (dataInColumn.length() > arrOfMaxColumnWidth[col])
                        arrOfMaxColumnWidth[col] = dataInColumn.length();
                }
                ++numberOfVisitedItems;
            }
            while(dataInColumn.length() != 0); /* do{} while loop is used to get number of rows in the table
                                       as long as an empty string is read, which means that all rows were read*/
            for (int col = 0; col < NumCol; ++col)
                int tmp = ColWidth[col] = arrOfMaxColumnWidth[col] * Scale;
            ColWidth[0] = 100;

需要帮助！

Answer 1

使用这个（用下面的代码替换你的for (int col = 0; col < NumCol; ++col)）：

for (int col = 0; col < NumCol; ++col)
{
    int len = 0;
    for(int row = 0; this->GetItemCount(); ++row)
    {
        CString item = this->GetItemText(row, col);
        if(item.GetLength() > len) len = item.GetLength();
    }
    if (len > arrOfMaxColumnWidth[col])
        arrOfMaxColumnWidth[col] = len; // should you multiple it to Scale?
}

Answer 2

无需重新发明轮子。如果您只想调整列的大小以适应文本，请尝试：

for (int i = 0; i < NumCol; ++i)
    ListView_SetColumnWidth( m_hWnd, i, LVSCW_AUTOSIZE );