CEditで65535文字の限界を超える

SetLimitText(0)すればOK

CWnd* pWnd = dlg.GetDlgItem(nItemId);
CEdit *edit = static_cast<CEdit*>(pWnd); //dynamic_cast does not work
if(edit != 0)
{
    UINT limit = edit->GetLimitText(); //The current text limit, in bytes, for this CEdit object.
    //value returned: 30000 (0x7530)
    edit->SetLimitText(0);
    limit = edit->GetLimitText();
    //value returned: 2147483646 (0x7FFFFFFE) 
}

ネタ元

• http://stackoverflow.com/questions/180853/cedit-control-maximum-length-in-characters-it-can-display
• http://www.atmarkit.co.jp/fdotnet/dotnettips/661textboxmaxlength/textboxmaxlength.html