请教：VC2019树视控件自行排序出错！

Question

这是网上的一段程序，关于树视控件自行排序。在VS2010能正常调试运行，但在VS2019调试时出错！直接运行（不调试）正常。

int CALLBACK MyCompareProc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
{
   //把该函数换成自己的规则
   CTreeCtrl* pmyTreeCtrl = (CTreeCtrl*)lParamSort;
   CString strItem1 = pmyTreeCtrl->GetItemText((HTREEITEM)lParam1);
   CString strItem2 = pmyTreeCtrl->GetItemText((HTREEITEM)lParam2);
   return strItem2.Compare(strItem1);
}

TVSORTCB tvs;
tvs.hParent = TVI_ROOT;
tvs.lpfnCompare = MyCompareProc;
tvs.lParam = (LPARAM)&m_TreeCtrl;
m_TreeCtrl.SortChildrenCB(&tvs);

其中一句出错:CString strItem1 = pmyTreeCtrl->GetItemText((HTREEITEM)lParam1);
错误信息：0x731F83DC (comctl32.dll)处(位于 Radar.exe 中)引发的异常: 0xC0000005: 读取位置 0x57D8F569 时发生访问冲突。

Answer 1

加个断点调试下，看看
CString strItem1 = pmyTreeCtrl->GetItemText((HTREEITEM) lParam1);
是不是有空指针