I have a bit of code in my App.cs file to catch unhandled exceptions in the event of a crash. The problems is when I step through the code, it reads as if the file exists, but no new file is actually created. I am probably overlooking something simple but I could use a second (or more ;)) set of eyes on it. Here is my method.
private void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
{
var contents =
string.Format(
"HResult: {1}{0}" + "HelpLink: {2}{0}" + "Message: {3}{0}" + "Source: {4}{0}"
+ "StackTrace: {5}{0}" + "{0}",
Environment.NewLine,
e.Exception.HResult,
e.Exception.HelpLink,
e.Exception.Message,
e.Exception.Source,
e.Exception.StackTrace);
if (!File.Exists("/Source/CrashLogs/Exceptions.txt"))
{
File.WriteAllText("/Source/CrashLogs/Exceptions.txt", contents);
}
else
{
File.AppendAllText("/Source/CrashLogs/Exceptions.txt", contents);
}
e.Handled = true;
}
I'll next expand this out so that the file name contains the current date, but I would just like to get it running first.
Thanks!!
is folder /Source/CrashLogs/ already exists?
handle also AppDomain.CurrentDomain.UnhandledException
more info here
Related
I'm new in developing in Visual Studio so I hope my problem is not too stupid :-)
I try to establish a FileWatcher in my VSPackage to detect any changes performed in the current solution.
For this I found the class FileWatcher, which - in my opinion - detect any file changes.
But anything in my code must be wrong as no event is fired.
Maybe you can help me?
The solution I want to watch is in D:\\Test but entering the specific path doesn't help
class Watcher
{
FileSystemWatcher watcher = new FileSystemWatcher();
[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
public void StartWatching()
{
Debug.WriteLine("in watcher method");
watcher.Path = #"D:\\";
watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
| NotifyFilters.FileName | NotifyFilters.DirectoryName;
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Deleted += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
watcher.EnableRaisingEvents = true;
}
private static void OnChanged(object source, FileSystemEventArgs e)
{
Debug.WriteLine("Changes in folder:" + e.FullPath);
}
private static void OnRenamed(object source, RenamedEventArgs e)
{
Debug.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
}
private static void OnDeleted(object source, RenamedEventArgs e)
{
Debug.WriteLine("deleted");
}
private static void OnCreated(object source, RenamedEventArgs e)
{
Debug.WriteLine("created");
}
}
In the initialize method of my VSPackage i call:
("in watcher method" is displayed in output so this part should work)
watch = new Watcher();
watch.StartWatching();
Tank you in advance!
EDIT
I found out, that the path at the test environment changes.
But now I have the problem, that I'm not able to get the name of the changed file, as the change event only gives me .opensdf or .sdf
Can you help me?
Instead of watching the file changes yourself you can use the built in events provided by Visual Studio: SolutionEvents and ProjectItemEvents. This Stack Overflow post explains how to use them in a vs package.
hi im working on a project that uses invoke and threads.. it is a simple remote desktop program with chat.. i got a sample here on the internet in c# winform, but i would like to convert it to wpf.. i have no problem in sending message to another client using the wpf program but it cannot receive ( or cannot read) the sent messages from the others.. i think it has something to do with the thread and the invoke method, i read that wpf does invoke differently and i did try the dispatcher.invoke, but it still doesnt do the trick
pls hellp
here's the code
wait = new Thread(new ThreadStart(waitForData));
wait.Start();
that snippet above is executed when a successful connection is made in tcpclient
private void waitForData()
{
try
{
NetworkStream read = tcpclnt.GetStream();
while (read.CanRead)
{
byte[] buffer = new byte[64];
read.Read(buffer, 0, buffer.Length);
s = new ASCIIEncoding().GetString(buffer);
System.Console.WriteLine("Recieved data:" + new ASCIIEncoding().GetString(buffer));
rcvMsg = new ASCIIEncoding().GetString(buffer) + "\n";
hasNewData = true;
bool f = false;
f = rcvMsg.Contains("##");
bool comand = false;
comand = rcvMsg.Contains("*+*-");
/*File receive*/
if (f)
{
string d = "##";
rcvMsg = rcvMsg.TrimStart(d.ToCharArray());
int lastLt = rcvMsg.LastIndexOf("|");
rcvMsg = rcvMsg.Substring(0, lastLt);
NetworkStream ns = tcpclnt.GetStream();
if (ns.CanWrite)
{
string dataS = "^^Y";
byte[] bf = new ASCIIEncoding().GetBytes(dataS);
ns.Write(bf, 0, bf.Length);
ns.Flush();
}
try
{
new Recieve_File().recieve_file(rcvMsg);
}
catch (Exception ec)
{
System.Console.WriteLine(ec.Message);
}
}
/*Command-shutdown/restart/logoff*/
else if (comand)
{
string com = "*+*-";
rcvMsg = rcvMsg.TrimStart(com.ToCharArray());
execute_command(rcvMsg);
}
else
{
this.Invoke(new setOutput(setOut));
Thread.Sleep(1000);
}
}
}
catch (Exception ex)
{
wait.Abort();
output.Text += "Error..... " + ex.StackTrace;
}
}
the snippet above is a code that listens if there is a message or command.. the line
this.invoke(new setoutput(setout)) is a code for appending text in the rtb
hope someone could help me thanks
You've posted a lot of code, but I'm assuming it's only the call to Control.Invoke which is causing the problem. In WPF, use Dispatcher.Invoke (or Dispatcher.BeginInvoke) instead, via the Dispatcher property on the relevant UI element.
I'd also strongly encourage you to:
Refactor your code into smaller methods
Stop catching just Exception except at the top level of any large operation (it should just be a fall-back; usually you catch specific exceptions)
Start following .NET naming conventions
Add a using directive for System so you can just write Console.WriteLine instead of System.Console.WriteLine everywhere
Use Encoding.ASCII instead of creating a new ASCIIEncoding each time you need one
Use a StreamReader to read character data from a stream, instead of reading it as binary data first and then encoding it
For either Stream or TextReader, don't ignore the return value from Read - it tells you how many bytes or characters have been read
I have a WebBrowser control on a form, but for the most part it remains hidden from the user. It is there to handle a series of login and other tasks. I have to use this control because there is a ton of Javascript that handles the login. (i.e., I can't just switch to a WebClient object.)
After hopping around a bit, we end up wanting to download a PDF file. But instead of downloading, the file is displayed within the webBrowser control, which the user can not see.
How can I download the PDF instead of having it load in the browser control?
Add a SaveFileDialog control to your form, then add the following code on your WebBrowser's Navigating event:
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
if (e.Url.Segments[e.Url.Segments.Length - 1].EndsWith(".pdf"))
{
e.Cancel = true;
string filepath = null;
saveFileDialog1.FileName = e.Url.Segments[e.Url.Segments.Length - 1];
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
filepath = saveFileDialog1.FileName;
WebClient client = new WebClient();
client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
client.DownloadFileAsync(e.Url, filepath);
}
}
}
//Callback function
void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
MessageBox.Show("File downloaded");
}
Source: http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/d338a2c8-96df-4cb0-b8be-c5fbdd7c9202
The solution I ended up using:
I did everything else as-needed to get the URL where it needed to go. Knowing that all of the login information, required settings, viewstates, etc. were stored in the cookies, I was finally able to grab the file using a hybrid of the web control to navigate then the WebClient object to actually snag the file bytes.
public byte[] GetPDF(string keyValue)
{
DoLogin();
// Ask the source to generate the PDF. The PDF doesn't
// exist on the server until you have visited this page
// at least ONCE. The PDF exists for five minutes after
// the visit, so you have to snag it pretty quick.
LoadUrl(string.Format(
"https://www.theMagicSource.com/getimage.do?&key={0}&imageoutputformat=PDF",
keyValue));
// Now that we're logged in (not shown here), and
// (hopefully) at the right location, snag the cookies.
// We can use them to download the PDF directly.
string cookies = GetCookies();
byte[] fileBytes = null;
try
{
// We are fully logged in, and by now, the PDF should
// be generated. GO GET IT!
WebClient wc = new WebClient();
wc.Headers.Add("Cookie: " + cookies);
string tmpFile = Path.GetTempFileName();
wc.DownloadFile(string.Format(
"https://www.theMagicSource.com/document?id={0}_final.PDF",
keyValue), tmpFile);
fileBytes = File.ReadAllBytes(tmpFile);
File.Delete(tmpFile);
}
catch (Exception ex)
{
// If we can't get the PDF here, then just ignore the error and return null.
throw new WebScrapePDFException(
"Could not find the specified file.", ex);
}
return fileBytes;
}
private void LoadUrl(string url)
{
InternalBrowser.Navigate(url);
// Let the browser control do what it needs to do to start
// processing the page.
Thread.Sleep(100);
// If EITHER we can't continue OR
// the web browser has not been idle for 10 consecutive seconds yet,
// then wait some more.
// ...
// ... Some stuff here to make sure the page is fully loaded and ready.
// ... Removed to reduce complexity, but you get the idea.
// ...
}
private string GetCookies()
{
if (InternalBrowser.InvokeRequired)
{
return (string)InternalBrowser.Invoke(new Func<string>(() => GetCookies()));
}
else
{
return InternalBrowser.Document.Cookie;
}
}
bool documentCompleted = false;
string getInnerText(string url)
{
documentCompleted = false;
web.Navigate(url);
while (!documentCompleted)
Application.DoEvents();
return web.Document.Body.InnerText;
}
private void web_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
documentCompleted = true;
}
I have a code like the following (I have stripped some code for readability)
private void RicercaArticoloStripped(object sender, DoWorkEventArgs e)
{
try
{
using (var context = new ControlloSchedeLocalEntities())
{
var prodotti = context.VProdotti.Where(i => i.WACMAT == textBoxCodiceArticolo.Text);
if (prodotti.Count() > 0)
{
this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(delegate()
{
textBlockDescrizioneArticolo.Text = prodotti.FirstOrDefault().WADESC;
}));
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error:\n\n" + ex.Message + "\r\nStack: " + ex.ToString());
}
}
private void textBoxCodiceArticolo_KeyUpStripped(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
worker = new BackgroundWorker();
worker.WorkerReportsProgress = true;
worker.DoWork += new DoWorkEventHandler(RicercaArticoloStripped);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RicercaArticoloWorkerCompleted);
worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
object[] parameters = new object[] { textBoxCodiceArticolo.Text, textBlockDescrizioneArticolo.Text };
worker.RunWorkerAsync(parameters);
}
}
So, as for my understanding of BackgroundWorker, when I instantiate the:
var prodotti = context.VProdotti.Where(i => i.WACMAT == textBoxCodiceArticolo.Text);
I am doing it FROM the working thread, not the UI thread.
But I get an exception on the line immediately below, when I try to access the value:
if (prodotti.Count() > 0)
I get the (in)famous error:
"The calling thread cannot access this object because a different thread owns it"
Why?
As you already said you must use Dispatcher.BeginInvoke/Invoke to perform operations from the control's owner thread or you will get "The calling thread cannot access this object because a different thread owns it" exception. Thats why you got this exception;
And here is why you got this exception on the line below (when prodotti.Count() was called):
When you create prodotti variable it's just a IEnumerable<T> object. So he actually calculates only when you call for prodotti.Count() method and thats why you got exception on this line.
IEnumerable actually is generator, that means that he will produce new set of objects every time he used.
To test this you can calculate prodotti as shown bellow:
var prodotti = context.VProdotti.Where(i => i.WACMAT == textBoxCodiceArticolo.Text).ToList();
In this case you will get exception immediately because .ToList() forces all calculations.
Check this article for generators and enumerators: http://www.codeproject.com/Articles/155462/IEnumerable-Lazy-and-Dangerous
Updated:
really, when you use IEnumerable with reference types you can get the same objects as previously. Read this answer for more: https://stackoverflow.com/a/14361094/1467309
The property Text of TextBox gets the value of the DependencyProperty Text, this can only be done from the UI-thread. You are accessing textBoxCodiceArticolo.Text from your Worker thread.
I am trying to get a background worker process working in a wpf application. it creates 2 files then crashes.
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += delegate(object s, DoWorkEventArgs args)
{
CreateFile(i.ToString());
};
worker.RunWorkerAsync();
private void CreateFile(string fileName)
{
string path = string.Format(#"{0}\{1}.txt", directory, fileName);
using (StreamWriter sw = new StreamWriter(path))
{
sw.WriteLine(fileName);
}
}
I get this error "
The requested operation cannot be performed on a file with a user-mapped section open." what am I doing wrong?
Any help would be great
Another process has the file open, e.g., an antivirus program or WordPad. You can use Process Monitor to see which process it is.