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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) 
}

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