Stack Overflows - Filesystemwatcher Unreliable With Large Amounts Of Processing?
Apr 19, 2010
I created a program that watches about 10 folders for different excel files. Using the filesystemwatcher with filters in place and correct error handling, it still misses some files once in a while (that's ok I guess).Anyways, I'm writing this because I added another form that has a filesystem watcher, when I tried to load the form I got a stack overflow error - an error that isn't debugged (a greenish line that you can only stop debugging).Am I going about this a wrong way? Is filesystemwatcher unreliable with large amounts of processing?
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Aug 20, 2011
Basically, my program will try to generate the list of all possible lowercase 5-letter words. Including all combinations that clearly are not real words like jshcc or mmdzq.
I do that by stacking up a massive amount of calls for a function, which does the word work.
But that's simply too much, and I get a stack overflow error.
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Mar 18, 2011
I just learned some basics of multi threading in VB.net recently as I came across processing a large List of records and inserting them into SQL database one by one.
I have code look like this:
Private Sub btnLoadNow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLoadNow.Click
Dim autoLoad1 As New Thread(AddressOf AutoLoad)
autoLoad1.Start()
[CODE]...
Itemlists is a global lists i retrieved from database, everything looks fine to me but when i run this program, I found that the threads are inserting one records 9 times into the database(I have 9 threads in total), which makes me think that maybe i need to specifically assign 1/9 of a list to each thread? Is there another way to do it which doesn't require the splitting of the list, if not , how do i split it then assign?
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Nov 11, 2011
How to send large amounts of text with TCP.[code]...
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Nov 11, 2009
What I want to do is display large amounts of text and a few pictures, ideally with hyperlinks between the pages. A lot like wikipedia really, lots of similarly arranged pages, text in categories with in-line hyperlinks and the occasional picture to illustrate a point.But not online, integrated as part of a larger app.
How would it be best to go about doing that? The display method is sortof dictated by the storage method. My thoughts were:
Lots and lots of labels stored in an Access database
Straight HTML as if it were a webpage embedded in an iFrame or something
Labels populated from XML files?
Program the whole lot in Flash or something else (A language I can't speak)
This is only a mockup for demonstration purposes so the priority is user-friendlyness and ease of programming rather than storage concerns or good programming form.
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Sep 5, 2009
Is it possible to create a kinda virtual storage in a vb application so that data created during run time are stored right in the applicaion instead of its environment?
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Oct 11, 2010
if I want to submit a large amount of text to my asp web page, do I need to worry about the text itself such as containing "&a=" that would mean another variable is being assigned for submitting data? Any way of not worrying about this? Or do I need to replace the & symbol everywhere in the test first if used?
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Apr 25, 2011
I recently wrote a program that collects information from the network can displays it in a DGV for the user to see. I tested this on networks where I would end up with several thousand items brought back and all worked fine, very little memory increase and once the search had finished the memory usage went back to pretty much what it was before the search, so I assume I have no major memory leaks that I should be concerned about (I'm careful to always dispose of things and clear large variables where possible).
However, a new company has now started using my application and they have several hundred thousand items that my program will find. They reported that they leave the program running its search for a few hours and most of the time it crashes with an Out Of Memory exception. Now I did have my app do some caching of certain information to avoid querying the network more than was necessary so I thought well maybe this is what is causing it but I added an option to turn that off and they say it still happens. So the only thing I can see it being is simply the amount of data that the program is finding and having to store in memory.once my application has gathered information about the items it stores them in a List(Of MyItemClass) and then when the search is complete the items are added to the DGV. So I'm thinking maybe its just the size of this List(Of MyItemClass) that is simply getting too large. Bear in mind that each instance of MyItemClass in this List can have quite a lot of information in it as it has several properties that are List(Of String) that may contain a few thousand strings in some scenarios.How do you deal with such large amounts of data without running out of memory?I'm assuming the only option I have got is to 'page' some of the data to a temporary file on disk once I get over a certain number of items in the List(Of MyItemClass)?
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Dec 18, 2009
I need to constantly display large amounts of colored text in WPF or Silverlight, and I need the user to percieve it as showing up instantly.
Currently I'm doing this using a canvas and textblocks, one textblock per 80-character line, with multiple runs to a textblock to handle the different colors. There can often be 20+ runs to a line.
In a 45x80 grid of text, this gets a framerate of about 12 in Silverlight, which is sluggish. Oddly enough, it's even slower in WPF... I can only speculate that this has something to do with my dev machine's lousy video card. Maybe it's trying to hardware accelerate and actually slowing down because of it?
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Dec 25, 2009
Couldn't think of a better title.(Background on the problem/me)Okay, so, first question/post here, so hi. Now that that's done with, the information pertinent to my problem. I'm fairly new to VB (and programming as well, aside from screwing around with C++ and learning assembler(well, attempting is the better word) god knows how many years ago), and have only seriously been programming for about under half a year, and my skill level is about at that stage. Only been using VB.Net, nothing older. Depending on the time of day and if I'm home or at school, I fluxuate between VB express and Vis Studio 08. Umm, this program I'm having trouble with was on a test that I took yesterday (took the problem home with me cause I really wanted to figure out what was wrong with it).
The stipulations of the test were:
No For->Each Loops
No using Built-In Sorting or Searching Functions
[code].....
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Oct 11, 2010
Been trying to implementing ThreadPool over a large and variable amount of data like the following:
public sub ProcessWorkItem(byval state as object)
Dim originalState as CustomStateInfo = CType(state, CustomStateInfo)
'Do stuff
[Code]....
This of course will bomb out if we have more than 64 items/threads being placed on the ThreadPool.
So, how would one process say x amount of items until there are no more items left to process?
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May 21, 2009
I got a question on sql splitting a record into peaces.I got a big record like this and all of this in one piece of record:
"
5/21/2009 1:03:49 PM
Order has been placed
5/25/2009 1:45:49 PM
[code]....
This is used for making notes, so you can keep adding notes on it until it's done.And I know this is not the 'best' way of keeping these records, this is the way how it was kept until now.So now my manager comes to me and asks to make a different structure of processing these notes.Because it is stored this way I can only retrieve full record from the database, but what I need is a way how to take for example only the 'top line' of it.Example:5/25/2009 8:45:49 PM Confirmation send
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May 22, 2012
I have spent way too much time trying to sort this little issue out. I have narrowed down the issue to the exact procedure that throws the error. Yes, I have used Google..
Try
Dim tempSource as String = Nothing
Console.WriteLine("Loading document...")
[code]....
I am loading a text file, that contains about 1100 lines, and each line is going to be processed with HTML Agility Pack. From what I can tell, when it runs "doc.loadhtml(richtextbox1)", it throws the error. I also have tried to load the file into a string, and load the string with "doc.loadhtml(thestring)". It doesn't make a difference, still errors.
Here are is a sample of how each line looks:
<Site Index="" Name="" Group="" PR="" />
<Site Index="" Name="" Group="" PR="" />
[code]....
I am using HTML Agility Pack, however the above is what is on every line, about 1100 lines! For testing, I have a smaller text file made of about 50 lines before I load up the 1100 line file ;) There aren't any HTML, HEAD, or BODY tags! They aren't needed for my parsing. I am using HTML Agility Pack because it is easy to parse elements with. I can grab each value easily from each line.
I am not sure if maybe the error is because it technically isn't HTML? Meaning since the loaded code doesn't have an HTML or BODY tag, that it errors? I wanted to get this question posted, and while I am waiting on some answers, I am going to parse the document another way. Just curious as to what the deal is and why HTML Agility Pack isn't working. More of a proof of concept then anything, for my own learning and knowledge.
Here is the error I get (btw the on the doc.load() line, is where it throws the exception):
Object reference not set to an instance of an object
Last Note: The routine is on a background thread. I have used multi-threading before, and have delegates created for deeper in the code.
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Jan 6, 2010
2008 Array Processing and Sequential File Processing
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May 19, 2011
Im a college student and this is my first programming class, i am having extremely diffcult time with arrays and sequential file processing. Im not asking for the whole program, just something to get me started and hints along as i progress with it. Please help me get started on my program, its due in 2 days.
Here are the requirements....
1. The program must input any number of individual�s last and first names using two separate textboxes.
2. The array of names must be sorted by the last name using a bubble sort. You must code the sort.
3. The program must be able to recall the names from the file and add to the existing list of names so that more names can be added to, sorted, and written back to the file in sorted order.
4. Sort in ascending order: A to Z
5. All names must be displayed in a listbox in sorted order when the user wishes to see them.
6. In the listbox the last and first names must be separated by a comma and a space. Example: Smith, Mary
7. The user must be able to search for a name in the array, using the binary search algorithm. You must code the search.
8. Do not use module-level variables. Instead you may choose to use Static.
9. The program must be designed using Visual Basic 2008
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Jun 9, 2011
I want to write a program to do Markov chain, but my states are quite large. First of all I calculate all the transition probabilities and revenues for all states(1381860 total states), and store in a multidimensional array. Public RevArr(0 To 9, 0 To 750, 0 To 282) As Long
After that the iteration of markov chain should use these as inputs to calculate the steady-state probabilities. But when I try to run the main code I got this error.Exception of type 'System.OutOfMemoryException' was thrown.
The following is the declaration of second array I add just another dimension for storing all the iterations, but I get this error. Dim stateprob(IT + 1, 0 To 9, 0 To 750, 0 To 282) As single
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Sep 11, 2010
This is what I am to create: [URL]I am having trouble coding the String for the amounts in the listbox since VB doesn't allow the dollar sign "$".
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Oct 13, 2011
I want to calculate the total for bill amounts in an arraylist. I have already used this code:
[Code]...
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Apr 11, 2009
I've been working on a project for a class for the last few days. Here is my current issue, I have created a form where I have multiple buttons representing different t-shirt with different prices. So hypothetically, if the end user were to click on the button that is assigned to red size small there would be an extra $2.00 (on top of the $5 fee of any other t-shirt), I know how to code for the calculation of one item, but I'm not certain how to add say a small red shirt, and a large pink shirt, and have the two items calculate correctly.
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Mar 20, 2009
make a money denomination program in VB.NET.The problem is when you enter a number the program should convert it to word format.If you enter in '98534671.23'the program should convert it to "ninety eight million five hundred thirty four thousand six hundred seventy one and twenty three cents".See Also:How can I convert an integer into its verbal representation?
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Mar 4, 2009
I am working on a VB application in Visual Studio 2005. I have a number of fields where the user needs to enter currency amounts. I am using a MaskedTextBox with the following currency mask. msktxtAssessedVal.Mask = "$ #######.99"
The problem that I am having is that when the users type in the value, the cursor always starts at the leftmost position and appears to force that many digits. The typical data values can vary anywhere between 9,999,999.99 and 20,000.00. If the users do NOT have a value that has 7 digits left of the decimal point, they need to move the cursor to the correct position before they start typing in the value. These users are used to quickly typing in their data, then tabbing to the next field so the current behavior is not acceptable.
Does anyone know if there is a way for the maskedtextbox or any text control to detect where the user types the decimal and format the data accordingly?
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Jul 16, 2010
I have three text boxes for inputting amounts of money. One is for a total check amount, the other two are separate amounts that should add up to the total check amount. In each of the individual text boxes validating events, I have the following
Private Sub txtAmount1_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtAmount1.Validating
Try
[code].....
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Jul 24, 2011
the project here is to take the three amounts from three text boxes entered by the user and return a string in a label telling the user if the triangle is either a right triangle, equilateral triangle, or neither after clicking a button. The code I have must use a new Class named Triangle. No matter what is entered in the text boxes, the label always returns "You created a right triangle!"
[Code]...
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Jan 28, 2012
The company require an application that displays coffee usage information for the managers of CostaB Coffee. Sample data has been provided for last years (2011) monthly usage amounts in kilos and is as follows: 400.5, 450, 475.5, 336.5, 457, 325, 220.5, 276, 300, 320.5, 400.5 and 415.
Requirements: The main form will allow the user to enter and store monthly amounts in an appropriate data structure. It will enable the users to calculate the total usage for the 12 month period and average monthly usage. A further requirement for the application is for the users to be able to display the monthly totals in ascending (smallest to highest) and descending (highest to lowest) order of the monthly usage amounts. Utilise appropriate formatting for input/output and include appropriate error trapping and data validation in the application.
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Apr 9, 2009
I'm trying to add a bargraph to one of my forms which will show a trend in dollars spent for certain projects (vs. the forecasted amounts). I wanted to know if there is a control or a function in VB.NET 2008 that I can use to build this graph in.... My only other thought is to use pictureboxes as bars (with background filled colors) and adjust their heights based on a ration or height to dollar amt... I don't mind doing this, but I wanted to know if there is a more intelligent way of building this... maybe some graph wizzard like in excel.
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Feb 20, 2012
I have my application watching my desktop, pictures, music, and document folders.[code]What would I need to put into logrename() in order for it to automatically upload the renamed file onto my server?
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Jul 31, 2010
I added FileSystemWatcher in Form1_Load like this -
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
....................
[code]....
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Apr 7, 2011
I can't seem to get a FileSystemWatcher to work, this is what I currently do.
Private Sub FileSystemWatcher1_Changed(sender As System.Object, e As System.IO.FileSystemEventArgs) Handles FileSystemWatcher1.Changed
MsgBox("Directory has changed")
End Sub
I have the filesystemwatcher path in my desktop. But when I create, re-name or delete something in the desktop it dosn't do anything, not even giving an error. I filter FileName, DirectoryName and LastWrite (the defaults).
The FileSystemWatcher have the EnableRaisingEvents set to true. So don't really know what the problem is.
I've tried google without any luck, all I found was people having problem that the FileSystemWatcher executed twice.
So do I have to do anything more on the code to get it to work?
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Mar 23, 2010
I have a FileSystemWatcher in my project and when Created new file, i can get MD5 value of the new file, but sometimes error occurred while getting MD5 value, my code is like this
Private Sub FileSystemWatcher_Changed(ByVal sender As System.Object, ByVal e As System.IO.FileSystemEventArgs) Handles SystemScanner.Changed
Try
[code]....
That error is "Access Denied", i think function must be wait for done the progress, how can resolve this problem ?
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May 25, 2010
I have a FileSystemWatcher monitoring a folder, and when many files are cut and pasted into the folder, the GUI freezes, as the 'Changed' event is fired over and over. Any way to deal with this?
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