CComBstr CString 截取字符串

CComBSTR bstr;
    pDoc->get_FileName(&bstr);
    CString cstring(bstr);
    int len = cstring.GetLength();
    int pos = cstring.ReverseFind('\\');
    CString tmpstr = cstring.Right(len-pos-1);
    MessageBoxW(NULL, tmpstr, L"", 0);