In form1 button click event :
First I'm trying to generate the Radar links.
private async void btnStart_Click(object sender, EventArgs e)
{
lblStatus.Text = "Downloading...";
await rad.GetRadarImages();
await sat.DownloadSatelliteAsync();
foreach(string link in sat.SatelliteUrls())
{
urls.Add(link);
}
await DownloadAsync();
}
The Radar class :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Extract
{
class Radar
{
private List<string> links = new List<string>();
string defaultlink;
DateTime current;
string currentLink;
public List<DateTime> dates = new List<DateTime>();
DateTime workingFirstDateTime;
public async Task GetRadarImages()
{
defaultlink = "mysite.com/Radar_";
current = RoundDown(DateTime.Now, TimeSpan.FromMinutes(-5));
var ct = current.ToString("yyyyMMddHHmm");
currentLink = defaultlink + ct + ".gif";
using (System.Net.WebClient wc = new System.Net.WebClient())
{
wc.DownloadFileCompleted += (s, e) =>
{
if (e.Error != null)
{
current = current.AddMinutes(-5);
ct = current.ToString("yyyyMMddHHmm");
currentLink = defaultlink + ct + ".gif";
wc.DownloadFileTaskAsync(new Uri(currentLink), #"d:\Downloaded Images\Radar\radar0.gif");
}
else
{
workingFirstDateTime = current;
GenerateRadarLinks();
}
};
await wc.DownloadFileTaskAsync(new Uri(currentLink), #"d:\Downloaded Images\Radar\radar0.gif");
}
}
private void GenerateRadarLinks()
{
for (var i = 0; i < 34; i++)
{
current = current.AddMinutes(-5);
dates.Add(current);
var date = dates[i].ToString("yyyyMMddHHmm");
links.Add(defaultlink + date + ".gif");
}
dates.Insert(0, workingFirstDateTime);
}
DateTime RoundDown(DateTime date, TimeSpan interval)
{
return new DateTime(date.Ticks / interval.Ticks *
interval.Ticks);
}
}
}
I'm downloading the first time :
await wc.DownloadFileTaskAsync(new Uri(currentLink), #"d:\Downloaded Images\Radar\radar0.gif");
Then in the completed event I'm checking if the downloaded file was fine or not by checking for error/s :
if (e.Error != null)
{
current = current.AddMinutes(-5);
ct = current.ToString("yyyyMMddHHmm");
currentLink = defaultlink + ct + ".gif";
wc.DownloadFileTaskAsync(new Uri(currentLink), #"d:\Downloaded Images\Radar\radar0.gif");
}
else
{
workingFirstDateTime = current;
GenerateRadarLinks();
}
};
If there is an error rebuild the link and try to download again this way I'm trying to rebuild the link over and over trying to download it until the download is success if there is no error/s the download is success then generate the link by calling the method GenerateRadarLinks()
The problem is I used a breakpoint on the line :
if (e.Error != null)
I see error 404 not found so the link is incorrect it should try to download over again with the new built link but instead it's jumping to the Program.cs and throw there the exception 404 not found :
Why it's not trying to download the new built link over and over again until success ?
Related
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Windows.Forms;
namespace DownloadFilesFromSite
{
public partial class Form1 : Form
{
private Queue<string> _downloadUrls = new Queue<string>();
private List<string> urls = new List<string>();
private List<string> sources = new List<string>();
private List<string> links = new List<string>();
public Form1()
{
InitializeComponent();
Sources();
}
private void Sources()
{
string link = "https://www.documentingreality.com/forum/f10/several-different-dead-chinese-women-176102/";
for (int i = 2; i < 141; i++)
{
sources.Add(link + "index" + i + ".html");
}
}
private void ReadSourcePage(string fn)
{
var lines = File.ReadAllLines(fn).ToList();
string contains = "https://www.documentingreality.com/forum/attachments/f10/";
for (int i = 0; i < lines.Count; i++)
{
if (lines[i].Contains(contains))
{
int index = lines[i].IndexOf("f10/") + 4;
int index1 = lines[i].IndexOf(".jpg") - index;
string result = lines[i].Substring(index, index1);
links.Add(contains + result + ".jpg");
}
}
}
private void downloadFiles(IEnumerable<string> urls)
{
foreach (var url in urls)
{
_downloadUrls.Enqueue(url);
}
// Starts the download
button1.Text = "Downloading...";
button1.Enabled = false;
progressBar1.Visible = true;
label1.Visible = true;
DownloadFile();
}
private void DownloadFile()
{
if (_downloadUrls.Any())
{
WebClient client = new WebClient();
client.Headers.Add("User-Agent: Other");
client.DownloadProgressChanged += client_DownloadProgressChanged;
client.DownloadFileCompleted += client_DownloadFileCompleted;
var url = _downloadUrls.Dequeue();
string FileName = url.Substring(url.LastIndexOf("/") + 1,
(url.Length - url.LastIndexOf("/") - 1));
client.DownloadFileAsync(new Uri(url), #"E:\dr\htmlsources\" + FileName);
label1.Text = url;
return;
}
// End of the download
button1.Text = "Download Complete";
}
private void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
if (e.Error != null)
{
// handle error scenario
throw e.Error;
}
if (e.Cancelled)
{
// handle cancelled scenario
}
DownloadFile();
}
void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
double bytesIn = double.Parse(e.BytesReceived.ToString());
double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
double percentage = bytesIn / totalBytes * 100;
progressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
downloadFiles(sources);
}
}
}
In the DownloadFile on the line :
client.DownloadFileAsync(new Uri(url), #"E:\dr\htmlsources\" + FileName);
If I copy the url address to the chrome it will show me the source of the page and I can save and download the source page it will be about 700KB
But when clicking the button1 when it start downloading this sources it will throw exception :
ArgumentOutOfRangeException: Value of '-154300' is not valid for 'Value'. 'Value' should be between 'minimum' and 'maximum'.
Parameter name: Value
And if I will not use the progressBar1 at all for testing all the downloaded sources files will be about 25KB instead about 700KB.
I tried to add the line :
client.Headers.Add("User-Agent: Other");
But not seems to fix the exception.
DownloadFileAsync will return immediately and then 'client' will also go out of scope. Read up on how to use async/await functions.
I have a problem. I made a service which monitoring printing jobs in real time. It didn't worked perfect, but I had no big problem. Now I need to change service into Windows Forms program. And I've got a problem with threads.
Error:
System.InvalidOperationException: 'The calling thread cannot access this object because a different thread owns it.'
This error appears on string "PrintQueue.Refresh()".
I can't find where the other thread tries to run.
I tried to set the other thread and start it with MonitoringJobs() procedure but it doesn't work.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Collections.Concurrent;
using System.Data.SqlClient;
using System.Diagnostics;
using System.ServiceProcess;
using System.Management;
using System.Windows;
using System.Printing;
using System.Configuration;
using System.Collections.Specialized;
using System.Threading;
namespace MonitoringPrintJobs
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
timer.Elapsed += GetJobs;
timer.AutoReset = true;
timer.Enabled = true;
}
System.Timers.Timer timer = new System.Timers.Timer(5);
int writeInterval = 1000;
int DefaultWriteInterval = 1000;
bool Logging;
SelectPrinter fSelectPrinter = new SelectPrinter();
ConcurrentDictionary<string, string> QueueJobs = new ConcurrentDictionary<string, string>();//declaration printers jobs dictionary
ConcurrentDictionary<string, DateTime> PrintedJobs = new ConcurrentDictionary<string, DateTime>();
PrintServer printServer = null;
PrintQueueCollection QueuesOnLocalServer = null;
List<PrintQueue> queues = new List<PrintQueue>();
public void MonitoringJobs()
{
//if(queues != null)
foreach (var PrintQueue in queues)
{
PrintQueue.Refresh();
using (var jobs = PrintQueue.GetPrintJobInfoCollection())//wait until collection updates!!!
foreach (var job in jobs)
{
if (!QueueJobs.ContainsKey(job.Name))//if list with printer jobs doesn't contain found job (name)
{//then put name in list with printer jobs
QueueJobs.TryAdd(job.Name, job.JobStatus.ToString());
if (Logging == true)
{
File.AppendAllText(#"D:\Logs\Logging.txt", String.Format("{0} - {1} - {2}{3}", DateTime.Now, job.Name, job.JobStatus, Environment.NewLine));
}
}
else//if list with printer jobs contains found job name
{
if (QueueJobs[job.Name] != job.JobStatus.ToString() && !QueueJobs[job.Name].ToLower().Contains("error"))//if status for this job doesn't exist
{
QueueJobs[job.Name] = job.JobStatus.ToString();//replace job's status
if (Logging == true)
{
File.AppendAllText(#"D:\Logs\Logging.txt", String.Format("{0} - {1} - {2}{3}", DateTime.Now, job.Name, job.JobStatus, Environment.NewLine));
}
}
if (job.JobStatus.ToString().ToLower().Contains("error") && PrintedJobs.ContainsKey(job.Name))
{
var someVar = new DateTime();
PrintedJobs.TryRemove(job.Name, out someVar);
}
}
if (QueueJobs[job.Name].ToLower().Contains("print") && !QueueJobs[job.Name].ToLower().Contains("error"))//if successfully printed
{
PrintedJobs.TryAdd(job.Name, DateTime.Now);
}
}
}
}
private void GetJobs(Object source, System.EventArgs e)
{
writeInterval--;
MonitoringJobs();
if (writeInterval <= 0)
{
writeInterval = DefaultWriteInterval;
PrintedJobs.Clear();
QueueJobs.Clear();
}
}
protected void OnStart()
{
QueuesOnLocalServer = printServer.GetPrintQueues();
writeInterval = 120000;
foreach (var item in fSelectPrinter.SelectetPrinters)
Logging = true;
foreach (var printer in fSelectPrinter.SelectetPrinters)
{
if (string.IsNullOrEmpty(printer))
{
timer.Stop();
Environment.Exit(0);
}
var queue = QueuesOnLocalServer.FirstOrDefault(o => o.FullName.ToUpper() == printer.ToUpper());
if (queue == null)
{
timer.Stop();
Environment.Exit(0);
}
queues.Add(queue);
}
timer.Start();
}
private void button2_Click(object sender, EventArgs e)
{
fSelectPrinter.ShowDialog();
}
private void Form1_Load(object sender, EventArgs e)
{
printServer = new PrintServer();
foreach (PrintQueue pq in printServer.GetPrintQueues())
fSelectPrinter.listBox1.Items.Add(pq.Name);
}
private void button1_Click_1(object sender, EventArgs e)
{
bool StartPrinting = button2.Enabled = false;//turn of select printers form button
if (StartPrinting == false)//StartPrinting == monitoring == true
{
OnStart();
}
else
{
StartPrinting = true;//StartPrinting == monitoring == false
timer.Stop();
}
}
}
}
In this program I tried to get printing jobs statuses and output them in listbox1 and write results with string.Format in file.
On Form1_Load event you are adding things to your fSelectedPrinter.Listbox.
If you items you are adding are coming from a different thread, that will cause an error. Only UI thread can update objects on a form without using SynchornizationContext.
private readonly SynchronizationContext synchronizationContext;
InitializeComponent();
synchronizationContext = SynchronizationContext.Current;
Here is an example:
private async void btnListFiles1_Click(object sender, EventArgs e)
{
if (txtDirectory1.Text == "")
{
MessageBox.Show(InfoDialog.SELECT_DIRECTORY,PROGRAM_NAME);
return;
}
if (!Directory.Exists(txtDirectory1.Text))
{
MessageBox.Show(InfoDialog.DIRECTORY_NOT_EXIST, PROGRAM_NAME);
return;
}
try
{
string fileTypes = (txtFileTypes1.Text == "") ? "" : txtFileTypes1.Text;
string[] files = Directory.GetFiles(txtDirectory1.Text.TrimEnd(),
(fileTypes == "") ? "*.*" : fileTypes,
(chkSub1.Checked) ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);
listBoxFiles.Items.Clear();
progressBar.Step = 1;
progressBar.Value = 1;
progressBar.Maximum = files.Length + 1;
listBoxFiles.BeginUpdate();
if (txtSearchPattern1.Text != "")
{
string searchPattern = txtSearchPattern1.Text.ToLower();
await System.Threading.Tasks.Task.Run(() =>
{
foreach (string file in files)
{
if (file.ToLower().Contains(searchPattern))
{
AddToListBox(file);
}
}
});
}
else
{
await System.Threading.Tasks.Task.Run(() =>
{
foreach(string file in files)
{
AddToListBox(file);
}
});
}
listBoxFiles.EndUpdate();
progressBar.Value = 0;
}
private void AddToListBox(string item)
{
synchronizationContext.Send(new SendOrPostCallback(o =>
{
listBoxFiles.Items.Add((string)o);
progressBar.Value++;
}), item);
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Facebook;
using System.Net;
using System.IO;
namespace WebSite_Login_And_Browsing
{
class Posts
{
public string PostId { get; set; }
public string PostStory { get; set; }
public string PostMessage { get; set; }
public string PostPicture { get; set; }
public string UserId { get; set; }
public string UserName { get; set; }
}
class FacebookPosts
{
static string accesstoken;
//static string token = "2f89d691b5f39";
static string token = "1186840401345424|GoJRCpM";
static string mytoken = "CAACEdEose0cBACPu39NSSalHCGFGDGRKZAvwiTuzG8PHlNRJwbyMVugovDxgL7CT3a1QbRuVDZALXxWU0ntwSrDyq75LIIuzFpBtx47cJYCY2OiA21lpTRKt2bB0t5HrsQYIXHXhmU7GnavWZCzqN8yeuv5NWXxTIOfVCZAZArjYNiPWhZBqZAZAO03s6FKNIulm4kjzXvp4QKiahAlcyaZBg";
static string mytokenaslip = "CAACEdEose0cBABmWuBI9p9dpPxEsMJoFZAG3kScx61kZAImNBgt52kVrd8WWPRpwjWP8nCPX69zdLuFyVQHzxYfMk85ZBZC4BIajVWXNLo7OI7yaCbNIwqkcdwpabQVFZBRWt0rzTQrQr6ZBij45XnrQyEUqFKP4gADeO4Fl9yRaZAZCOFtV3b84sWUFEgwaKbZAPY4BCljVjWQZDZD";
public static void RetrievePosts()
{
try
{
var client = new FacebookClient(mytokenaslip);
dynamic result = client.Get("/me/posts");
List<Posts> postsList = new List<Posts>();
//all the posts and their information (like pictures and links) is strored in result.data not in result
for (int i = 0; i < result.data.Count; i++)
{
Posts posts = new Posts();
posts.PostId = result.data[i].id;
if (object.ReferenceEquals(result.data[i].story, null))
posts.PostStory = "this story is null";
else
posts.PostStory = result.data[i].story;
if (object.ReferenceEquals(result.data[i].message, null))
posts.PostMessage = "this message is null";
else
posts.PostMessage = result.data[i].message;
posts.PostPicture = result.data[i].picture;
posts.UserId = result.data[i].from.id;
posts.UserName = result.data[i].from.name;
postsList.Add(posts);
}
}
catch (Exception err)
{
//throw;
string myerr = err.ToString();
}
}
}
}
I'm getting 25 results in the List postsList
How do i loop now asgain to get the next page with the next 25 results and add it to postsList and loop over and over again untill there are no more results ?
What i want to do is to delete automatic every 50 minutes the last old 25 posts.
In my other class in my project i'm posting automatic to my wall a post every minute. After 50 minutes i want to delete the last old 25 posts so on my wall will be all the time with 25 posts only.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using mshtml;
using HtmlAgilityPack;
using System.Net;
using System.IO;
namespace WebSite_Login_And_Browsing
{
public partial class Facebook_Post : Form
{
WebBrowser wb = new WebBrowser();
int postsCounter = 0;
StreamWriter w = new StreamWriter(#"e:\posts.txt");
WebBrowser webBrowser1;
public Facebook_Post()
{
InitializeComponent();
webBrowser1 = new WebBrowser();
webBrowser1.DocumentCompleted += webBrowser1_DocumentCompleted;
webBrowser1.ScriptErrorsSuppressed = true;
webBrowser1.Navigate("https://www.facebook.com/");
label4.Text = DateTime.Now.ToString();
w.WriteLine(label4.Text.ToString());
w.WriteLine(Environment.NewLine);
label5.Visible = false;
label2.Visible = false;
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
try
{
if (e.Url.AbsoluteUri != webBrowser1.Url.AbsoluteUri)
{
return;
}
wb = webBrowser1;
foreach (HtmlElement he in wb.Document.All.GetElementsByName("xhpc_message"))
{
he.SetAttribute("value", RandomString(10));
}
var elems = wb.Document.GetElementsByTagName("button");
foreach (HtmlElement elem in elems)
{
if (elem.InnerText == "Post")
{
elem.InvokeMember("click");
}
}
sent = true;
postsCounter += 1;
label2.Text = postsCounter.ToString();
label2.Visible = true;
timer1.Enabled = true;
webBrowser1.Dispose();
if (postsCounter == 720)
{
w.WriteLine(postsCounter.ToString());
w.WriteLine(Environment.NewLine);
label5.Text = DateTime.Now.ToString();
label5.Visible = true;
w.WriteLine(label5.Text.ToString());
w.Close();
}
}
catch(Exception err)
{
string myerr = err.ToString();
}
}
private void button1_Click(object sender, EventArgs e)
{
List<string> results = new List<string>();
HtmlElementCollection elems = wb.Document.GetElementsByTagName("INPUT");
foreach (HtmlElement elem in elems)
{
String nameStr = elem.GetAttribute("value");
results.Add(nameStr);
}
}
bool sent = false;
int count = 0;
private void timer1_Tick(object sender, EventArgs e)
{
try
{
count += 1;
if (sent == true && count >= 60)
{
count = 0;
timer1.Enabled = false;
webBrowser1 = new WebBrowser();
if (webBrowser1.IsBusy == false)
{
webBrowser1.DocumentCompleted += webBrowser1_DocumentCompleted;
webBrowser1.Navigate("https://www.facebook.com/");
}
sent = false;
}
}
catch(Exception err)
{
string myerr = err.ToString();
}
}
private StringBuilder builder;
private static Random random = new Random((int)DateTime.Now.Ticks);
private string RandomString(int size)
{
try
{
builder = new StringBuilder();
char ch;
for (int i = 0; i < size; i++)
{
ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);
}
}
catch(Exception err)
{
string myerr = err.ToString();
}
return builder.ToString();
}
}
}
I believe this is what you're looking for:
var client = new FacebookClient(mytokenaslip);
//1-25
dynamic result = client.Get("/me/posts", new { limit = "25", offset = "0"});
//26-50
dynamic result = client.Get("/me/posts", new { limit = "25", offset = "25"});
You can also chose to get more than 25 posts at once.
//51-100
dynamic result = client.Get("/me/posts", new { limit = "50", offset = "50"});
You can use a "recursive function" to get all entries, and the "next" parameter in the API result includes the API call for the next batch of results: https://developers.facebook.com/docs/graph-api/using-graph-api#paging
Be careful though, you may hit an API limit if you try to do this too fast and if there are too many results. Also, since you want to delete old entries and deleting one entry is one API call, you should try with a timeout after each call just to make sure not to hit a limit.
Make sure you learn and understand how recursive functions work, here´s one of countless threads about that: Help with Creating a Recursive Function C#
I am developing an application for my own, In fact this application is for downloading latest version of antivirus that we are using in our company
in this application I want to use DownloadFileAsync method for download my files but it's not working and I am getting this error :
WebClient does not support concurrent I/O operations.
this is my source code :
private static WebClient wc = new WebClient();
private static ManualResetEvent handle = new ManualResetEvent(true);
private DateTime myDate = new DateTime();
private void btn_test_Click(object sender, EventArgs e)
{
using (WebClient client = new WebClient())
{
client.Encoding = System.Text.Encoding.UTF8;
var doc = new HtmlAgilityPack.HtmlDocument();
ArrayList result = new ArrayList();
doc.LoadHtml(client.DownloadString("https://www.symantec.com/security_response/definitions/download/detail.jsp?gid=savce"));
foreach (var href in doc.DocumentNode.Descendants("a").Select(x => x.Attributes["href"]))
{
if (href == null) continue;
string s = href.Value;
Match m = Regex.Match(s, #"http://definitions.symantec.com/defs/(\d{8}-\d{3}-v5i(32|64)\.exe)");
if (m.Success)
{
Match date = Regex.Match(m.Value, #"(\d{4})(\d{2})(\d{2})");
Match filename = Regex.Match(m.Value, #"\d{8}-\d{3}-v5i(32|64)\.exe");
int year = Int32.Parse(date.Groups[0].Value);
int month = Int32.Parse(date.Groups[1].Value);
int day = Int32.Parse(date.Groups[3].Value);
myDate = new DateTime(
Int32.Parse(date.Groups[1].Value),
Int32.Parse(date.Groups[2].Value),
Int32.Parse(date.Groups[3].Value));
listBox1.Items.Add(m.Value);
if (myDate == DateTime.Now)
{
Download(m.Value,filename.Value);
}
else
{
MessageBox.Show("There is no Update!");
}
}
}
}
}
private void Download(string url, string fileName)
{
wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(wc_DownloadProgressChanged);
wc.DownloadFileAsync(new Uri(url), #"\\10.1.0.15\Symantec Update Weekly\\" + fileName);
//wc.DownloadFile(url, #"\\10.1.0.15\Symantec Update Weekly\\" + fileName);
}
private void WcOnDownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
if (!e.Cancelled && e.Error == null)
{
//async download completed successfully
}
handle.Set();
}
private void wc_DownloadProgressChanged(object sender, System.Net.DownloadProgressChangedEventArgs e)
{
double bytesIn = double.Parse(e.BytesReceived.ToString());
double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
double percentage = bytesIn / totalBytes * 100;
progressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
}
when my application trying to download files,
it seems that above method can not download multiple files in same time.
I searched a lot and find this solution but I could not apply that into my application.
how can I solve that.
thanks in your advise.
// Declare a field to hold the Task
private static Task DownloadTask;
private Task Download(string url, string fileName)
{
var wc = new WebClient();
wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(wc_DownloadProgressChanged);
return wc.DownloadFileTaskAsync(new Uri(url), #"\\10.1.0.15\Symantec Update Weekly\\" + fileName);
}
You'll probably need change the progressbar to handle multiple threads.
Inside btn_test_Click
// Before foreach
var tasks = new List<Task>();
// Inside foreach
if (myDate == DateTime.Now)
{
MessageBox.Show("Updates are New");
}
else
{
tasks.Add(Download(m.Value,filename.Value));
}
// After foreach
// You can also set the TimeSpan value and update the progressbar
// periodically until all the tasks are finished
DownloadTask = Task.WhenAll(tasks);
See Task.WaitAll, WebClient.DownloadFileTaskAsync
I have two exceptions here. Not sure why they occur because I use Form.Invoke to run UI updates on the UI thread. So first,
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Xml;
using System.Windows.Forms;
namespace Toplr
{
using System.Collections.Specialized;
using System.Xml.XPath;
using System.Xml.Linq;
using System.Text;
using System.ServiceModel.Web;
using System.ServiceModel.Syndication;
using System.Net;
using System.Web;
using System.Xml.Schema;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
public partial class ToplrForm : Form
{
private readonly Uri SearchBase = new Uri(#"http://www.twine.com/feed/atom/entries/");
private readonly UriTemplate SearchTemplate = new UriTemplate(#"search?type={type}&author={author}");
public ToplrForm()
{
InitializeComponent();
Exiting = false;
TaskContext = new TaskManager();
Items = new AsyncBindingList<Twine>(this);
twineBindingSource.DataSource = Items;
}
private void ToplrForm_Load(object sender, EventArgs e)
{
}
private readonly TaskManager TaskContext;
private readonly AsyncBindingList<Twine> Items;
private bool Exiting;
private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
MessageBox.Show("Close()");
Close();
}
private void ToplrForm_FormClosing(object sender, FormClosingEventArgs e)
{
MessageBox.Show("Exiting = tru");
Exiting = true;
//TaskContext.Dispose();
}
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
var sfd = new SaveFileDialog()
{
ValidateNames = true
};
if (sfd.ShowDialog() == DialogResult.OK)
{
using (var xtw = new XmlTextWriter(sfd.FileName, Encoding.UTF8))
{
var xw = XmlWriter.Create(xtw);
xw.WriteStartDocument();
xw.WriteStartElement("opml");
xw.WriteAttributeString("version", "1.1");
xw.WriteStartElement("head");
xw.WriteElementString("title", userNameComboBox.Text);
xw.WriteEndElement();
xw.WriteStartElement("body");
foreach (var row in twineDataGridView.SelectedRows)
{
var twine = (Twine)((DataGridViewRow)row).DataBoundItem;
if (twine != null)
{
xw.WriteStartElement("outline");
xw.WriteAttributeString("text", twine.Title);
xw.WriteAttributeString("type", "link");
xw.WriteAttributeString("url", twine.HtmlAddress);
xw.WriteStartElement("outline");
xw.WriteAttributeString("text", twine.Title);
xw.WriteAttributeString("type", "atom");
xw.WriteAttributeString("url", twine.AtomAddress);
xw.WriteEndElement();
xw.WriteEndElement();
}
}
xw.WriteEndElement();
xw.WriteEndElement();
xw.WriteEndDocument();
xw.Close();
}
}
}
private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
{
MessageBox.Show("Copyright (C) 2009 Bent Rasmussen");
}
private void accessButton_Click(object sender, EventArgs e)
{
var user = userNameComboBox.Text;
Task.Create(x => ProcessAccount(user));
}
public void ProcessAccount(string user)
{
this.Invoke((Action)(() =>
{
userNameComboBox.Enabled = false;
accessButton.Enabled = false;
toolStripStatusLabel1.Text = "Processing...";
}));
var param = new NameValueCollection();
param.Add("type", "Twine");
param.Add("author", user);
var source = SearchTemplate.BindByName(SearchBase, param);
var wc = new WebClient();
using (var feedStream = wc.OpenRead(source))
{
var reader = XmlReader.Create(feedStream);
var feed = SyndicationFeed.Load(reader);
int c = 0, i = 0;
foreach (var item in feed.Items)
{
this.Invoke((Action)(() =>
{
toolStripProgressBar1.Increment(1);
toolStripStatusLabel1.Text = "Processing...";
}));
if (item.Links.Count != 0)
{
//try
{
ProcessTwine(item);
i++;
}
//catch (Exception)
{
c++;
}
}
if (Exiting)
break;
}
}
this.Invoke((Action)(() =>
{
userNameComboBox.Enabled = true;
accessButton.Enabled = true;
}));
}
private Twine ProcessTwine(SyndicationItem item)
{
var result = new Twine();
result.Title = item.Title.Text;
result.HtmlAddress = item.Links[0].Uri.ToString();
result.AtomAddress = "";
var wc = new WebClient();
var data = wc.DownloadData(result.HtmlAddress);
var stream = new MemoryStream(data);
var readerSettings = new XmlReaderSettings()
{
ProhibitDtd = false,
ValidationType = ValidationType.None,
ValidationFlags = XmlSchemaValidationFlags.None,
};
var reader = XmlReader.Create(stream, readerSettings);
var doc = XDocument.Load(reader);
var htmlNs = (XNamespace)"http://www.w3.org/1999/xhtml";
var root = doc.Root;
var atom = from r in root.Descendants(htmlNs + "head").Descendants(htmlNs + "link")
where r.Attribute("rel").Value == "alternate" && r.Attribute("type").Value == "application/atom+xml"
select r.Attribute("href");
foreach (var e in atom)
{
if (e.Value != "")
{
result.AtomAddress = e.Value;
this.BeginInvoke((Action)(() =>
{
Items.Add(result);
toolStripProgressBar1.Increment(1);
}));
}
break;
}
return result;
}
}
}
This triggers the exception "Cannot access a disposed object" on this fragment
this.Invoke((Action)(() =>
{
toolStripProgressBar1.Increment(1);
toolStripStatusLabel1.Text = "Processing...";
}));
If this fragment is commented out, I run into the next problem - a TargetInvocationException on Program level.
The inner exception of this is an InvalidOperationException.
The code is quite simple, so it should not be hard to implement this, I just new a few hints to move on.
Visual Studio project files.
If the user hits the exit button, the Close() method is called, and the UI starts getting torn down. However, your worker code keeps running and attempts to update the UI, which it can no longer do.
If you centralise all those invoke calls:
public void UpdateUI(Action action) {
if(!Exiting) this.Invoke(action);
}
you can call:
UpdateUI(() =>
{
toolStripProgressBar1.Increment(1);
toolStripStatusLabel1.Text = "Processing...";
});
(etc - all the this.Invoke calls should use UpdateUI instead)
and it should work. Also, make Exiting volatile.