WebClient And Locked XML File (deadlock Error)?
Jan 19, 2010
Quote:
System.Exception: Transaction (Process ID xx) was deadlocked on lock resources with another process and has been chosen as the deadlock victim.
I suspect this
Dim webc As New WebClient
webc.DownloadFile(remotexml, targetxml)
webc.Dispose()
Then i am using the targetxml right after that:
Dim xmldoc As New XmlDocument
xmldoc.Load(targetxml)
etc.
It seems that xml file is locked by the first process (WebClient).
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Dec 21, 2009
I am reading file with text contents on it.sample dictionary.txt contents:
aa
abaca
abroad
apple
Snippet A:
Dim path as String = Server.MapPath("dictionary.txt");
Dim dictionary() as String = {}
Try
[code]....
Basically, I want to make sure that I can handle/prevent this error.Does Snippet B, solves the problem, if not is there other way so that I can prevent this error.BTW, this a web application and I am expecting multiple users.
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Feb 1, 2012
I have written an application that monitors a log file. The Log file is locked by the writing application so I read it asynchronously:
Dim LicenseLog As New System.IO.FileStream("\serverLOGlicense.log", IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.ReadWrite)
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Jun 3, 2009
I am loading data from an Excel File to a dataset and performing some computation. The problem arises after the application is closed, the Excel file is locked for some reason and can only be read.
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Oct 25, 2010
I have been using VB2005 for many years on 2 PCs. Over the last month I have been getting an error when I try to run the project from the IDE:
Error 1 Unable to copy file "objx86DebugBackup.exe" to "binx86DebugBackup.exe". The process cannot access the file 'binx86DebugBackup.exe' because it is being used by another process.
C:WindowsMicrosoft.NETFrameworkv2.0.50727Microsoft.Common.targets 2324 9 Backup
My questions:
1. What has changed?
2. One thread I found suggested that it is a bug, but if true is this something that has been introduced recently (I'm not aware up updating VB2005 unless it happened as part of the general updates).
3. How do I get it back to where it was?
The file is actually locked by my own process, no other application can be using it. I've even tried it with a few line noddy program. I always have to come right out of the IDE, wait a couple of minutes and then go back in - a total productivity killer.
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Apr 21, 2010
is there a way to unlock file that is locked by IIS without doing a IIS reset? If yes, how can I do that in VB
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Mar 4, 2012
I am using WebClient.DownloadString method in vb.netto convert asp.net page to string after that I send this string by email. by I got this error from the server The remote server returned an error: (500) Internal Server Error. Unfortunately, no more details about the error. what is the possible problem ? edit: error in the following line of code :
[Code]...
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Jul 6, 2010
I am wondering how I can replace a file locked by another application. I am using VB.NET from 2008.
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Mar 20, 2008
I have developed a program that allows drag and drop pictures using the followng [code] this will display the image in the pictruebox and saves the location of the image to a database. at this time i can rename the image in windows using the file.rename() function.now if i exit and come back into the section of the program with the image.i query the database for the image location and use the same type of code aka ploc [code]Now when i try to do a rename of the file i get an error that says access denied. I have even tried changing images, but as long as i am in the program i get access denied.I also can not change or delete these file from windows as long as my application is runningfile.rename() Is there a way to force my program to stop using this picture so i cand rename or delte it?
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Nov 15, 2011
I have the following code that I'm trying to retrieve the HTML document. Not sure why it wouldn't work. Here's what I captured from Live HTTP Headers:
[Code]...
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Mar 4, 2012
I am using WebClient.DownloadString method in vb.netto convert asp.net page to string after that I send this string by email. by I got this error from the server
The remote server returned an error: (500) Internal Server Error.
Unfortunately, no more details about the error. what is the possible problem ?
error in the following line of code :
Dim str As String = client.DownloadString(Request.Url.GetLeftPart(UriPartial.Authority) + "/GFOPortalA/isd/ViewForm.aspx?ISD_FRM_NO=" + Session("ISD_ReqId"))
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Mar 8, 2010
I've been testing using WebClient.DownloadString and sometimes I encounter an error: "The remote server returned an error: (403) Forbidden". It is based upon which url I use. For instance, this works:
Dim wc As New Net.WebClientDim strResult As String = String.Empty
Try
strResult = wc.DownloadString("http:/ Obama pages always fails.
[code].....
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May 30, 2012
I'm automating downloads. I was getting this error quite a bit using Webbrowser to navigate to a PDF (various PDFs at various websites). In other words the PDF was already on display in the browser when I called WebClient.DownloadToFile. I got a LOT better results when I desisted from WebClient and switched to this API (just pass in the two strings along with zeroes for the other parameters).
[Code]...
And yet Webclient seems oriented for only two entries (username and password). How do you set up the credentials for three entries? I hate to abandon WebClient, but at this point I just don't know how to make it work.
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Feb 10, 2010
In my application, i am downloading file from DMS system to my server. Once the file gets downloaded, on some environment, the iis keeps lock of the file and when the application tries to redownload the file and put the file on same location, an error is generated that file is being used by another process. Following is the code :
[Code]...
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Mar 28, 2009
In which situations we can do the multithreading and deadlock concepts. can give some examples
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May 1, 2010
I'm trying to download a simple text file from a web server. It's easily accessible from the web browser and I can download it from the web browser. However, whenever I use a WebClient to download the file, I get a 403 Access Forbidden Error! I'm not sure what I'm supposed to do. I haven't come across this kind of error in programming before and I'm not sure what I'm supposed to do to get around it.
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Nov 12, 2011
My program takes user input, replaces all spaces with "+", then inserts it into a search url for a specified web host. For example, the user enters:"How long is a foot?"
The generated URL (in this case I'm using dogpile.com) is:
"http://www.dogpile.com/info.dogpl/search/web?&q=How+long+is+a+foot"
This method has worked before for me, but now I just get an Internal Server Error every time the code is executed.
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Sep 7, 2010
If I have two Synclocks
synclock a
synclock b
end synclock
[code].....
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Jan 17, 2012
I have a VB.NET GUI (VS2005) that calls into a VB6 DLL to query MSAccess 2003 databases using DAO 3.6. Yes, I know this is not an ideal scenario, but that's the way the current application is set up. Component Checker shows MDAC 2.8 SP1 is installed. This application usually runs for a long time on our customer's Windows XP SP3 system with no issues. Occasionally (read: after 11 minutes or 11 hours or days), we experience a hang in the application, such that it needs to be ended with task manager and restarted. According to crash dumps and one lucky capture within the debugger, all threads are waiting on objects/critical sections within ntdll.dll. My specific thread gets stuck there and comes from MSJet40.dll. In the crash dumps, most threads are stuck in NTWaitForSingleObject, RtlEnterCriticalSection, etc.
I've been troubleshooting this intermittent issue for months and am convinced this is a bug in MSJet40.dll. The version of the DLL is 4.0.9511 and I see there is a hotfix for 4.0.9514 on XP SP3 outlined in: =[URL] I would like to get this hotfix to see if it fixes the issue and speak with MS if it doesn't. I have crash dumps and procmon traces of these events. This sounds very similar to the dreaded "Jet Bug" that shows up on a Google, supposedly fixed for Windows 2003 Server SP1, but I see no mention of it on Windows XP SP3.
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Apr 13, 2011
I was wondering if this is known / expected behavior. By design?Is it documented somewhere?
My 'real' code does need something to keep one thread from accessing a listview while another is busy clearing and refreshing the Items collection, so it's not as easy as omitting the synclock section in the example below (The SyncLock in my case is on the ListView).
This code, which can be pasted over a new empty form's user code class, deadlocks during the Invoke call. It doesn't reach the entry point of SetText (setting a brakpoint there, the deadlock occurs before the breakpoint is hit).[cod]e...
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Oct 7, 2011
I've managed to narrow down my issue to a simple annoyance. I had a Webbrowser control mostly coded to navigate around an Oracle CRM On Demand site to generate metric reports, but then realized when I tried to build in the auto-download part, that the Webbrowser object wasn't going to give me the behind-the-scenes control I wanted. Searching online, it seems the Webclient control might be a better route. However I'm stuck trying to get by the login page so I can use the Download-File method to get my generated xls report. [Code] But every reply from the server has "Sign In Error: Both a user sign in ID and a password must be given." which tells me the form/post data isn't getting where it needs to go (It thinks the form is blank at [Code].
The above username and password are bogus of course, but once I can get a different reply then 'the fields are blank' I can worry about correct logon information. I'm just not sure what I'm not doing correctly or if I need to include something else. Since it's a publicly accessible site and I'm stuck getting something in the form to be 'seen', it should be easy for others to try and test.
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Sep 21, 2011
I am getting an error with this Dim Web As New WebClient Web.Proxy = "69.196.16.237:62159" It says runtime errors may occur when converting string to System.Net.IWebProxy What does that mean?
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Mar 27, 2009
I will connect with one database from several machines. In all machines they need to insert the data in single table. In that time: how to use multithreading and deadlock concepts? Using the MySQL database and also MS Access.
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Nov 23, 2010
I am trying to use system.net to download a zip from a website.I am using the following code .[code].....I am doing something wrong here.The zip file is getting downloaded but the size is not correct.How to know the size of the file I download and assign to my buffer .
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Aug 15, 2011
I am trying to use WebClient to download a .zip file from my server. In debugging mode the code works perfectly, but when I deploy my software the file does not even begin to download.After my program checks to see if an update is available, it should download the .zip file from my web server via the following
[Code]...
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Mar 1, 2011
I am using the code below to upload a file to a server running windows IIS 5.1.
I am just testing on my own computer to see if this works ok. However, I keep getting the following error message:
The remote server returned an error (405) Method Not Allowed I am sure this is a IIS problem maybe something to so with permissions. However, I am configure the virtual directory to allow read, write, and directory browsing.
The config.xml file I am trying to upload is located in the same directory as the executable and does exist.
Private Sub upload_config_to_server()
Dim url As New Uri("http://localhost/softphone/config.xml")
Dim wc As New WebClient()
[Code]....
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Feb 19, 2012
[code]It gives me problems right there because it downloads the file but not the data in it,url... is 1 kb and has one character in it - 1, when it downloads it has the right name and extention but the contents and size is gone size is 0 bytes and contents are empty.
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Feb 1, 2012
My program writes to a .txt file (and this is the ONLY program that writes to it) in a thread (with lowest priority), but every now and then it gets an error "The process cannot access the file because another process has locked a portion of the file" when it executes this code: swLog.WriteLine(sPacket).Other program reads from the file, not write to it, why do I get this error, and how can I get around it, or what shall I do when I get this error since I can't write to the file ?
Class
clsFile
Private swLogOrig As StreamWriter
[code].....
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Aug 8, 2011
I'm using the WebClient class' OpenWriteAsync function, and I'm having a little trouble with it. I want it to write some information to a .txt file I have uploaded on my FTP. I made it display a message after it has completed doing so, and the message does indeed pop up.However, I've checked my .txt file numerous times, and it hasn't actually been e Here's some of my
Dim otherclient As New WebClient()
AddHandler otherclient.OpenWriteCompleted, AddressOf WriteCompleted
otherclient.OpenWriteAsync(New Uri(URL))
[code].....
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Jun 29, 2010
I need to upload a file to an ftp site. Can I use a simple webclient or do I need to use ftpwebrequest? What are the differences?
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