// Web interaction methods
private bool PrepareLogin()
{
InsertLog("Waiting response from AIMS server...", Color.Black);
WebManager loginPage = new WebManager("https://banweb.cityu.edu.hk/pls/PROD/twgkpswd_cityu.P_WWWLogin");
try
{
loginPage.Load();
InsertLog(loginPage.ToString());
InsertLog("Server responsed.", Color.Blue);
// Get required login parameters
foreach (HtmlAgilityPack.HtmlAttribute attr in loginPage.GetHtmlNode("//input[@name='p_sess_id']").Attributes.AttributesWithName("value"))
{
SessionID = attr.Value;
}
foreach (HtmlAgilityPack.HtmlAttribute attr in loginPage.GetHtmlNode("//input[@name='p_ip']").Attributes.AttributesWithName("value"))
{
IPAddress = attr.Value;
}
InsertLog("p_ip: " + IPAddress + ", p_sess_id: " + SessionID, Color.Green);
return(true);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
if (ex is WebException)
{
InsertLog("Server returned error: " + ex.Message, Color.Red);
}
else if (ex is NullReferenceException)
{
InsertLog("Cannot retrieve the login parameters.", Color.Red);
}
else
{
InsertLog(ex.ToString(), Color.Red);
}
}
return(false);
}
private List <Course> GetCourseListFromRegisteredRecords()
{
InsertLog("Retrieving your active registered course...", Color.Black);
WebManager activeCoursePage = new WebManager("https://banweb.cityu.edu.hk/pls/PROD/hwskaddp_cityu.P_ChkReg");
try
{
activeCoursePage.Load();
InsertLog(activeCoursePage.ToString());
String title = activeCoursePage.GetHtmlNode("//h2").InnerText;
label_registeredCourse.Text = label_registeredCourse.Text.Replace(":", " for " + title.Replace("Active Registration (", "").Replace(")", "") + ":");
List <Course> toReturn = new List <Course>();
foreach (HtmlAgilityPack.HtmlNode row in activeCoursePage.GetHtmlNodeCollection("//table[3]//tr"))
{
HtmlAgilityPack.HtmlNodeCollection courseDetails = row.SelectNodes("td");
// Ignore the first row
if (courseDetails != null && courseDetails[0].InnerText != "CRN")
{
Course course = new Course();
course.CRN = courseDetails[0].InnerText;
course.CourseCode = courseDetails[1].InnerText;
course.Section = courseDetails[2].InnerText;
course.Title = courseDetails[3].InnerText;
course.Credit = Convert.ToSingle(courseDetails[4].InnerText);
toReturn.Add(course);
}
}
InsertLog("Retrieved registered course.", Color.Blue);
return(toReturn);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
if (ex is WebException)
{
InsertLog("Server returned error: " + ex.Message, Color.Red);
if (ex.Message == "Break in attempt" || ex.Message == "Session timeout")
{
if (PrepareLogin() && Login())
{
return(GetCourseListFromRegisteredRecords());
}
}
}
else if (ex is NullReferenceException)
{
InsertLog("Cannot retrieve registered course.", Color.Red);
}
else
{
InsertLog(ex.ToString(), Color.Red);
}
}
return(null);
}