An exception problem with column alignment for the MFC clistctrl control

See more:

MFC

m_ListCtrl->Create(WS_CHILD|WS_VISIBLE|WS_BORDER|LVS_REPORT,RDlgList,this,10000);

DWORD dwStyle = m_ListCtrl->GetExtendedStyle();
dwStyle |= LVS_EX_FULLROWSELECT;
dwStyle |= LVS_EX_GRIDLINES;

m_ListCtrl->SetExtendedStyle(dwStyle);
m_ListCtrl->InsertColumn( 0 , _T("Num") , LVCFMT_LEFT ,50);
for (int i = 1 ; i < COLNUM; i++)
{
strListname.Format(_T("REsult %d"),i);
m_ListCtrl->InsertColumn( i , strListname , LVCFMT_LEFT ,100);
}

When COLNUM exceeds 347, the display immediately appears misplaced and the data behind 348 cannot be seen. How can I solve this problem

What I have tried:

i had try to new ctl,but it is not useful