CStdioFile file;

file.Open(_T("parametertable.txt"), CFile::modeCreate|CFile::modeWrite);

file.WriteString(cstr+_T("\n"));//cstr---CString 类型

file.Close();

CStdioFile file;

int isOPend;

isOPend = file.Open(_T("ParameterSetting.ini"),CFile::modeRead);

if (!isOPend)

 {AfxMessageBox(_T("文件不存在或加载错误！"));

   return;}

CString strLine;

while(file.ReadString(strLine)) //每行读入strLine

    {......}

file.Close();