.net - How To Deallocate Memory
Nov 4, 2010
I have the following method for looping through a table, changint some values in every row and saving the chages back to the database. To make things go faster I am fetching data in sets of 10,000 rows. This is a large table with over 25 million records in it.
The problem is that my application doesn't seems to be releasing any memory. I have tried redeclaring the records variable to nothing or explicitly caling the garbage collector but the memory stays there.Runnning the built-in VS10 profiler I can see that the culprit is the system.linq.enumerable.tolist() method which takes up over 98% of my memory. How do I release that memory after the call to saveChanges?
[Code]...
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Feb 15, 2012
I have created an application which creates multiple webbrowser controls at runtime...now i want to clean up memory when these webrowsers are deleted see the code how can i do it(i have tried dispose method but no luck)
Creation on dynamic web browsers on button click
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]....
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Nov 5, 2009
In VB 2005, I am calling a C++ DLL function that returns the address in memory and size in bytes of a jpeg image. How can I load that jpeg image directly from memory into a picture box in my VB form? I cannot afford to save it to disk first.
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May 22, 2007
Im getting a problem with one of my programs I have made in visual basic.NET where it gives me a memory error when i debug the program in the IDE. the exact error is this: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". My program basically has a few forms with text fields on that get their text values from an access database on the same hard drive. Im wondering if im doing something wrong because my program just seems to eat up memory whenever it does anything. For example I have one form that has a combobox on it and when you change the drop down list selection it retreives a few strings from the database and puts them into the relevant text boxes, if you keep changing the selection then the memory usage (in task manager) just keeps going up and up. occasionally I get the error mentioned above when debugging but in my built version of the program it throws an exception everytime the memory usage gets past 49K.
Also I noticed when debugging in the "immediate window" frame I get the following message often:A first chance exception of type 'System. Invalid OperationException' occurred in System.Data.dll...Do I need to somehow be "releasing" the memory that is used to gather data once it becomes redundant?
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Nov 24, 2011
I am using the following code
This error occurs :
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Public Class FormRegEnumValue
[CODE]......................
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Feb 1, 2009
QuoteSystem.AccessViolationException was unhandled Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Source="System.Windows.Forms"
Im designing a web browser and i continue to receive this error after going to about 3 websites it crashes with that error.
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Jan 20, 2010
I have a BackgroundWorker object that I instantiated to perform a DB process on a background thread ansynchronously. I have event handlers for DoWork and RunWorkerCompleted. I can tell that the BackgroundWorker is disposing of itself because I added a message box into the Disposed event handler.Is it necessary to detach the event handlers to ensure that the memory is cleaned up and that there are not memory leaks?
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Apr 17, 2011
I've noticed that every time I start a new thread in my program, the memory usage jumps about 1000k and it never goes back down. I have ensured that the thread is no longer running, and only one instance of my worker thread is ever running at a time. I am using ThreadPool.QueueUserWorkItem and ASyncOperation to get stuff done. The program starts using a Sub Main in a module that uses STAThread; I read that using STAThread instead of MTAThread makes it impossible for the Garbage Collector to get in and consider objects for garbage collection. However, when I change the STAThread to an MTAThread, the WebBrowser control in my frmMain cannot be instantiated.
I get this exception:
Code: An unhandled exception of type 'System.Threading.ThreadStateException' occurred in System.Windows.Forms.dll
Additional information: ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment. I do threading with the WebBrowser control, so will using MTAThread fix my problem? If so, how should I partition my code so that the WebBrowser control won't be affected by the above exception? I call the thread repeatedly with a timer (although only one instance ever runs at a time), and my program's memory usage starts at about 5000k and can jump to 300,000k+ depending on many times the thread needs to be called.
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May 27, 2009
I cannot use Visual Basic 2008 at all. When I go to "new project" and choose "Windows Form Application" I get this error.I have tried multiple uninstall/reinstall with no result.A microsoft reply to this suggested that I needed: " .NET Framework 2.0 Service Pack 1 " I checked, and I did not have the .netframework 2.0 service Pack 1.
When I tried to download and install the above from Microsoft.com, the istaller said that "it was not allowsed" and I was not able to install the service pack 1.
I tried Uninstalling net framework 3.5, 3.0, 2.0 and then reinstalling .netframework 2.0 sevice pack 1; then reinstalling Visual basic 2008 express edition. At the reinstall of Visual basic 2008, .netframework 2.0 sevice pack 1 is unistalled by .net framework service pack 2.When I check the foruims for simiar problems, the formus are mostly for Visual basic 5.0, or other programs that I do not have.
Here is the programs I have installed:
Operating system: Windows XP
Microsoft .net framework 1.1
Microsoft .NET framwork 1.1 Hotfix(KB928366)
Microsoft .Net Framework 2.0 Service Pack 2
[code]....
All the security updates and hotfixes for Widows XP.
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Jan 11, 2012
The follow code can be called about 6K times on the server it is run on then gets a out of memory error in the last catch statement. I don't see what is wrong with the code, it works well up until the out of memory..
Public Function AddUserToGroup(ByVal sSamAccountName As String, ByVal sGroupName As String) As Boolean
Try
Dim returnStatus As Boolean = True[code]......
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Feb 9, 2011
I have two forms, Form1 and Form2. Form2 has a button to show OpenFileDialog. I call Form2 from Form1 by a button. My startUp Form is Form1. When i start debugging, i press my Form1's button to show my Form2, it shows, but when i click On Form2's Button to show OpenFileDialog it is giving me exception that
"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
When i set my startup Form to Form2 and click Form2's Button to show OpenFileDialog then it shows!
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Aug 3, 2010
I have a new problem with this same Form Printing project and I get exactly the same exception but from the different point of code:
line 538: d.PrintFunction(c, typePrint, mp, x, y, extendedHeight, ScanForChildControls)
The exception type is System.AccessViolationException and it says (after I translate it from my own language in which the message is given in my pc, into English):"Protected memory was tried to be read or written. This often indicates that the other memory is damaged"
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Aug 4, 2010
I am getting the following error: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". i am using interop service.
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Feb 9, 2011
This code was put together for a one time run. It's purpose is to count all the pages in a group of images. After about 6000 of 1,250,000 images in ##X it throws an "out of memory" error. Besides it being thrown together for a one time run does anybody see anything obvious that could be causing the error?
CODE:
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Dec 11, 2011
I am using VB.NET 2010 and accessing a DLL that was created in VB6.I added the DLL in the References, and in the program I do the following:
Dim
RTF As
myDLL.clsRTF
[code]....
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Feb 15, 2010
I have a hard problem here: how to cleanup the no use memory from the RAM?
[Code]...
I have a container that need to add many PictureBoxes with a quite large image, then i need to clear all PictureBoxes and create some new ones. like this: If I click the button some more times, my computer will be out of ram, whatever how many ram do your computer have.How can I dispose all the things used in Graphics and the controls in FlowLayoutPanel1 but not disposing the FlowLayoutPanel1 itself?
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Aug 31, 2009
How can i detect how much memory each tab is using
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Jan 4, 2010
i was concerned if constants take up storage. if a class had 10 integer constants at class level, will that adds up to 40bytes of storage or is that actually not true because they are constants?
what i'm trying to do: find the best place to put the constants that i need to access at class scope, and whether its best to make them shared or not. [constants are private]
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Jun 7, 2011
A short while ago, I posted the following code snippet in reply to someone who was looking to make a simple encoded password... See here for a full explanation of how this works --> [URL].
[Code]....
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May 15, 2009
What is the best way to get a structure from memory, I know the format:
[Code]...
The structure is 53 bytes until the chat text, the message length is determined by one of the structure variables LineLength, so what is the best way to get that and put into into a structure?
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Apr 20, 2009
How would i go about editing memorey in Visual basic..(like say i have a memorey for a program {EX. x032342 is the memory} and how would i call the program and put this memorey in
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Jun 10, 2009
I am pretty new to Visual Basic and am only using it to create a very simple programme. It is essentially an interactive encyclopedia where the user can type in a subject into a text box and get a form with information on it to pop up. I am not using any data sets etc. While the forms are all very simple and the code very limited there are dozens of forms involved, this was working fine until recently when I started to run into OutOfMemoryExceptionThrown every time I try to build my program and debug it. This exception started appearing sporadically with the programme sometimes compliling fine and other times refusing to but now it is every time. I have never written code to do this before so how do I got about freeing up memory? I read in a similar post that it may be connected to allocating memory and then not freeing it up again, or perhaps having too many event handlers in my program without ending them, however I am lost and don't know how to fix these problems.
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Jun 22, 2010
I am writing some code to retrieve data from SQL Server, including an image field. I load the retrieved image data into a byte array and then convert the array into an image. Finally, I want to show a thumbnail of the image in a picturebox control on my app's form. All this works perfectly on my dev machine running windows 7, but the following code:
Dim myblankCallback As Image.GetThumbnailImageAbort = New Image.GetThumbnailImageAbort(AddressOf blankCallback)
PictureBox1.Image = newImage.GetThumbnailImage(180, 180, myblankCallback, New
[Code]....
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Dec 8, 2011
I am testing code that recursively searches for files, reads them and determines if a user supplied text string can be found. I am getting Out of memory errors on files > 250 MB. The system has 4GB RAM and no other apps are running. Here is the section that throws the error. Other than this, the program seems to work perfectly. 250 MB files are OK, 275MB files are not.
Private Function FindStringInFile(ByVal FileName As String, ByVal SearchFor As String) As Integer
Dim strTest As String = String.Empty
[Code].....
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Mar 29, 2012
The following code works with smaller images, but it throws an out of memory exception when the image is a png file, 8 bit depth, 13200x10234 pixels.
Using FS As New IO.FileStream(FileName, IO.FileMode.Open, IO.FileAccess.Read)
Dim B = New Bitmap(System.Drawing.Bitmap.FromStream(FS))
End Using
I'm working on a viewer that shows an image, asks the user for a window and saves the cropped image. Here is an overview of what I'm trying to achieve: The process starts with a 30+MB pdf file containing hundreds of large technical drawings. I open the file with the pdf reader, save as png 300dpi images, then I run my application that works on the saved images. I am interested on a few details of those drawings, and I have two goals:
1) Use my viewer with a subset of details instead of the pdf reader with the full set of whole images, and
2) Pick some cropped details and insert them into another application.
I start the application, look at the first image, click delete, and keep clicking delete until I find an drawing with a detail that I need. Then I draw a rectangle, save the cropped image, and repeat with 3-4 more details on the same image. Then delete the original image, go to the next, and restart the cycle. So I start with 100 large images in my folder and end with 20 small ones. At this point I can browse them very quickly and continue with the following steps (inserting them in another application).
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Jan 20, 2009
the program ive created will need to run for 3-7 days with out be restarted.im worried about memory leaks and anything else that might occur. to view what my program is using ive opened windows task manager.these are the reading i get:
CPU: between 0 and 2
working set(memory) about 29,596 - 29,600k
memory(private working set) about 8756 k[code]....
2 question, first does this look ok (is my program using to much memory, etc) and secondly why does the thread say 12-14?i thought the program is one thread plus i have a second thread running in the background so shouldnt that be just 2 then?(the program is an sms sender.it sends and recieves sms's, databases them, and sends out responses based on what the txt msg is).
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Mar 22, 2011
i want to be able to fill in a form using an XML file from the user.how can i have them upload the XML file to read, without actually saving it to the server? is it possible?
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Dec 10, 2011
I have a little code here, but it is not working. When I try to run this then it says that "the index was outside the bounds of the array".[code].....
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Jun 3, 2010
There isa xml file about 30 mb size. we are reading text of this file and assigning to a string variable.Then it occupy sapce in memory. But after comes out from method memory still not released. I also set variable to nothing.It still not released.[code]When i close the application.Then all the memory release. Or when i use the GC.GetTotalMemory(True) after st=nothing. Then most of the memory release not completely. I am checking the memory usage from Task manager and process explorer.
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Oct 1, 2010
in main form, when a button is clicked, it opens a new form which has a webbrowser. users can use it to browser some sites. if the user closed this form, it goes back to the main form. and they can click button to open the browser form again.
I noticed that one thing. if the browser form is opened, it uses much memory (which is normal because of the site it browses). however, after the browser form is closed, the memory is not released.
In the browser form, when it is closing, the webbrowser is disposed and dereferenced. and no other part uses much memory in the form. GC is called too. what else should I do to release all memory the browser form uses?
now, it is like once the browser form is opened once, the memory usage never goes down even the form is closed.
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