Technical notes

 Take input from a MFC Control as string : CString txtname; GetDlgItemText(IDC_EDIT1, txtname); Here IDC_EDIT1 is the Control Edit Text and txtname is the input at the moment we call. Convert it to integer or int : int iPort = _atoi( txtname.GetString() ); int iPort = _wtoi( txtname.GetString() ); // if you use wide charater formats     Append text to Edit Control :   void CServerDlg::AppendTextToEditCtrl(CEdit& edit, LPCTSTR pszText) {    // get the initial text length    int nLength = edit.GetWindowTextLength();    // put the selection at the end of text    edit.SetSel(nLength, nLength);    // replace the selection    edit.ReplaceSel(pszText); }