private bool CheckCourseAvailabilityFromMasterClassSchedule(Course course)
{
InsertLog("Checking availability of " + course.CourseCode + " " + course.Section + "...", Color.Black);
WebManager schedulePage = new WebManager("https://banweb.cityu.edu.hk/pls/PROD/hwscrssh_cityu.P_DispOneSection");
try
{
String[] courseSubjectAndCode = Regex.Split(course.CourseCode, @"(?<=\D)(?=\d)");
schedulePage.SetReferer("https://banweb.cityu.edu.hk/pls/PROD/hwscrssh_cityu.P_GetCrse")
.AddParameter("term", AddDropTerm)
.AddParameter("subj", courseSubjectAndCode[0])
.AddParameter("crse", courseSubjectAndCode[1])
.AddParameter("camp", "")
.AddParameter("web_avail", "")
.Load();
InsertLog(schedulePage.ToString());
// Retrive the course details
foreach (HtmlAgilityPack.HtmlNode row in schedulePage.GetHtmlNodeCollection("//div[@class='body']//tr[@bgcolor='#ffccff']"))
{
HtmlAgilityPack.HtmlNodeCollection courseDetails = row.SelectNodes("td");
if (courseDetails[1].InnerText == course.Section)
{
courseDetails[6].SelectSingleNode("span[@style='display:none']")?.Remove();
int.TryParse(courseDetails[6].InnerText.Substring(2), out course.AvaliableQuota);
courseDetails[8].SelectSingleNode("span[@style='display:none']")?.Remove();
int.TryParse(courseDetails[8].InnerText, out course.WaitlistQuota);
break;
}
}
return(course.AvaliableQuota > 0 || course.WaitlistQuota > 0);
}
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(CheckCourseAvailabilityFromMasterClassSchedule(course));
}
}
}
else if (ex is NullReferenceException || ex is ArgumentOutOfRangeException)
{
InsertLog("Cannot retrieve the course details.", Color.Red);
}
else
{
InsertLog(ex.ToString(), Color.Red);
}
}
return(false);
}
private List <Course> GetCourseListFromMasterClassSchedule(String courseCode, List <String> courseSectionList)
{
InsertLog("Retrieving course details of " + courseCode + "...", Color.Black);
WebManager schedulePage = new WebManager("https://banweb.cityu.edu.hk/pls/PROD/hwscrssh_cityu.P_DispOneSection");
try
{
String[] courseSubjectAndCode = Regex.Split(courseCode, @"(?<=\D)(?=\d)");
schedulePage.SetReferer("https://banweb.cityu.edu.hk/pls/PROD/hwscrssh_cityu.P_GetCrse")
.AddParameter("term", AddDropTerm)
.AddParameter("subj", courseSubjectAndCode[0])
.AddParameter("crse", courseSubjectAndCode[1])
.AddParameter("camp", "")
.AddParameter("web_avail", "")
.Load();
InsertLog(schedulePage.ToString());
// Retrieve the course title
String courseTitle = "";
String htmlSource = schedulePage.GetHtmlNode("//div[@class='body']/b[1]").InnerText;
if (htmlSource.IndexOf("Course : " + courseCode + " ") >= 0)
{
courseTitle = htmlSource.Substring(htmlSource.IndexOf("Course : " + courseCode + " ") + courseCode.Length + 10);
InsertLog("title: " + courseTitle, Color.Green);
}
else
{
throw new NullReferenceException();
}
// Retrive the course details
List <Course> toReturn = new List <Course>();
HtmlAgilityPack.HtmlNodeCollection courseTable = schedulePage.GetHtmlNodeCollection("//div[@class='body']//tr[@bgcolor='#ffccff']");
if (courseTable != null)
{
foreach (HtmlAgilityPack.HtmlNode row in courseTable)
{
HtmlAgilityPack.HtmlNodeCollection courseDetails = row.SelectNodes("td");
// Ignore the duplicate rows
if (courseDetails[0].InnerText != "" && courseSectionList.Remove(courseDetails[1].InnerText))
{
Course course = new Course();
course.CRN = courseDetails[0].InnerText;
course.CourseCode = courseCode;
course.Section = courseDetails[1].InnerText;
course.Title = courseTitle;
course.Credit = Convert.ToSingle(courseDetails[2].InnerText);
course.Date = courseDetails[9].InnerText;
course.DayOfWeek = courseDetails[10].InnerText;
course.Time = courseDetails[11].InnerText;
course.Room = courseDetails[13].InnerText + ", " + courseDetails[12].InnerText;
course.Instructor = courseDetails[14].InnerText;
courseDetails[6].SelectSingleNode("span[@style='display:none']")?.Remove();
int.TryParse(courseDetails[6].InnerText, out course.AvaliableQuota);
course.MaxQuota = Convert.ToInt32(courseDetails[7].InnerText);
courseDetails[8].SelectSingleNode("span[@style='display:none']")?.Remove();
int.TryParse(courseDetails[8].InnerText, out course.WaitlistQuota);
toReturn.Add(course);
}
}
}
String notFoundSections = "";
foreach (String courseSection in courseSectionList)
{
notFoundSections += (notFoundSections == "" ? "" : ", ") + courseSection;
}
if (notFoundSections != "")
{
InsertLog("Cannot find section(s) " + notFoundSections + ".", Color.Red);
}
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(GetCourseListFromMasterClassSchedule(courseCode, courseSectionList));
}
}
}
else if (ex is NullReferenceException || ex is ArgumentOutOfRangeException)
{
InsertLog("Cannot retrieve the course details.", Color.Red);
}
else
{
InsertLog(ex.ToString(), Color.Red);
}
}
return(null);
}