void SetWidthByContentInListBox(CDialog* pDlg, int nID)
{
if (nID <= 0|| pDlg == NULL) return;
CWnd* pWnd = (CWnd*)pDlg;
CListBox* pCB = (CListBox*)pWnd->GetDlgItem(nID);
if (pCB == NULL) return;
int origSize = pCB->GetHorizontalExtent();
int maxSize = origSize;
CDC* pDC = pWnd->GetDC();
CString cStr;
int str_num = pCB->GetCount();
for (int i = 0; i < str_num; i++)
{
pCB->GetText(i, cStr);
CSize strSize = pDC->GetOutputTextExtent(cStr);
if (strSize.cx > maxSize)
maxSize = strSize.cx;
}
// in case when adding to list, existing items may be
// longer than newer ones, so may not want to resize
if (maxSize > origSize)
pCB->SetHorizontalExtent(maxSize);
}
