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);
 }
}