c/c++语言开发共享C++核心技术登录实现

void clmsdlg::onbuttonlogin() {  // todo: add your control notification handler code here  cmainsystem dlg;  cadoconn adoconn;  cstring sqlstr,str;  int countcleck;  countcleck=((ccombobox*)getdlgitem(idc_combocleck))->getcursel();  ((ccombobox*)getdlgitem(idc_combocleck))->getlbtext(countcleck,str);    updatedata(true);  if(m_user.isempty())  {   messagebox("用户名不能为空","错误",mb_iconerror);   getdlgitem(idc_edituser)->setfocus();  }  try  {   sqlstr.format("select *from usertable where uusername='%s' and uuserpassword='%s' and uusercleck='%s'",m_user,m_password,str);   _bstr_t vsql;   vsql=(_bstr_t)sqlstr;   _recordsetptr m_recordset;     m_recordset=adoconn.getrecordset(vsql);      cstring str1,str2,str3;   str1=(lpcstr)(_bstr_t)(m_recordset->getcollect("uusername"));   str2=(lpcstr)(_bstr_t)(m_recordset->getcollect("uuserpassword"));   str3=(lpcstr)(_bstr_t)(m_recordset->getcollect("uusercleck"));   str1.trimright();   str2.trimright();   str3.trimright();   if(str1==m_user || str2==m_password || str3==str)   {    messagebox("恭喜你，登录成功!","正确",mb_iconquestion);    this->enddialog(1);    dlg.domodal();   }  }  catch(...)  {   messagebox("操作失败","错误",mb_iconerror);   m_user="";   m_password="";   getdlgitem(idc_edituser)->setfocus();   updatedata(false);  } }