Why Is The MemoryStream Data Not Released From Memory
May 19, 2009
Is there something that needs to be done with the following code to release the memory it uses?
Dim objImage As MemoryStream
Dim objwebClient As WebClient
Dim sURL As String = Trim(m_StationInterface.PicLocation)
[Code].....
The code is on a popup form that shouldn't ever get disposed. A new image is loaded onto the form every time it pops up. However, the process size for the application continues to grow each time it makes it through that code block.
I've tried objImage.Close() and .Flush(), objWebClient.Dispose(). The process size still grows by a good 4mb after every call. It's like the old image is kept in memory.
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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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Jun 10, 2010
in VB.NET How can i write a memory stream to browser.My memory stream object has data to build a PDF file.Now i want it to be rendered on browser.How to do that ?
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Oct 22, 2010
Am trying to debug an application written by someone else. The issue is we get an "Out of Memory" when executing the following code
[Code]...
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Jun 24, 2011
I'm attempting to use symmetric encryption to encrypt some data, and store the key necessary to decrypt with the data in a MemoryStream. (While I know that this alone is really dumb security-wise, I'm going to use RSA to encrypt the symmetric key. Right now, though, I'm trying to just get this part to work.)I'm using the FileHelpers library to parse the data for my delimiter (the semicolon, as I don't believe I'll ever have a semicolon in the data). Unfortunately, in my decryption function, when it's parsing, it only returns back one record. And, if I show the entire string of encrypted data created at the end of this function, it doesn't appear to be using multiple records.I'm wondering if when I create the new cryptostream, it's defaulting to the beginning of the memory stream, so when I write my encrypted data, it overwrites the data I had just written to the memory stream.[code]
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Nov 18, 2009
I'm facing this peculiar problem since the past two days and now it is driving me nuts.I initialize a StreamReader from a MemoryStream object. When I move the seek pointer to beginning, the first time it is OK, but from 2nd time onwards I see an extra bad character at the beginning of stream that obviously should not be there.This doesn't happen with StreamReader initialized with other constructors like directly passing filename etc.I constructed a small program to demonstrate this. I added 2 buttons to a form and this code. When I run this code, clicking Button1 shows extra character at the beginning of string after ResetSeekPointer() function has been called at-least twice. This doesn't happen when I click Button2
vb.net
Imports System.IOImports System.XmlImports System.Xml.XslImports System.Xml.SchemaImports System.Collections.Genericublic Class Form1Private myStreamReader As
[code].....
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Dec 23, 2009
i've got a Set and a Get in a property. I want to allow multiple threads to do Get anytime they wish to, however if any thread tries to do Set, all threads must not be able to Get/Set until the Set is complete.[code]the problem is that this is pretty inefficient because each request to Get will steal the Mutex and prevent other Gets until the stolen Mutex is Released. Is there anyway to just check if a Mutex is released instead of using WaitOne because WaitOne checks and gains control of the Mutex which is not what i want
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Jan 7, 2011
When running a program in VS debug mode, I use the Debug.Print and watch the Immidiate Window. I'm sure there are more advanced ways to debug, but I haven't learned so far.
But I would like to know how is the best way to track both log of exceptions as well as in-code specific method print-outs (like Debug.Print), during "released" runtime; outside VS.
I would like for two purpose:
Write to log text-file
Write to UI window, like a rich-textbox.
Is this a case I should use Console.Writline? I have never used that, so if you could briefly explain if this is the right tool for what I want to accomplish, or what other ways I should consider.
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Jul 30, 2009
I can define a NEW sub that runs when an object is instantiated. What is the correct sub to call when it is disposed? I would think a method named dispose, but I seem to remember somewhere that there is a better choice than dispose.
Why do I care? I want to be able to track when a given object is released.
With a form, I can use formClosing, but what about a simple class definition?
how I would know what to search for to have found it without bugging any of you? everything I tried resulted in way too many hits that had nothing to do with VB or what I wanted to achieve.
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Apr 11, 2012
Private Function GetImageSize(ByVal FileName As String) As Size
Dim ImageSize As Size
Using BR As New BinaryReader(New FileStream(FileName, FileMode.Open))
Do
[code]....
I want to display photos of people when the mouse passes over their name. I wanted to be able to size the picture box to be proportional to the various photographs and let the Stretch property handle the rest.I used the code above offered by John Wein to a question from 2009 to read the dimension of the picture It worked fine until I pass over the same person twice. Then I get an error that the file is in use by another process.I tried adding:
"BR.Close"
With and without
"BR.Dispose"
But the file is still locked-out on the second pass. I tried setting "PictureBox.Image = Nothing" when the mouse leaves the square, still the file is seen as in use and locked.
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Feb 19, 2010
I have a VB program that displays a PDF file. When the program is closed it takes 30 seconds or so before AcroRd32 process releases the PDF file. In certain circumstances if the program is restarted with in this period, the PDF file does not display. The specific circumstances is that I have a second program (re)starting the program that displays the PDF file.
a) Make the PDF file be immediately released when my program closes
b) When the PDF file is loaded test that it properly loaded so that it can be reloaded if necessary.
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Sep 1, 2009
in a winform, in vb net,I have a list view with hoverselection set to true. I start a drag and drop operation when the mousedown event is fired, but it's fired only when i release the mouse button on the control or on the dropped control!
is it a normal behavior?
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May 17, 2010
I've created a simple Windows Forms Application and the idea is I want to identify all instances of Excel, save any open workbooks to my desktop and close all the Excel instances down.[code]I'm pretty new to this C# business so hints on the following two possible issues I've identified would be much appreciated:The ForEach loop doesn't seem to be successfully looping through the XlApp.Workbooks collection as I was hoping.
It seems that I can't quit each Excel application which, with my current code structure, is causing an infinite loop. My suspicion is that Marshal.GetActiveObject() is locking it up and preventing it from closing?If nothing obvious jumps out then I might try the alternative method by Andrew Whitechapel mentioned and linked to on this thread.
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Aug 2, 2011
I have a program designed in VB.net for a wafer probing system. The software has 3 main components that come standard and three that are options. When a customer decides not to have the three options they are disabled but still in the program. If at some point they decide to buy the options, one of our technicians would have to go there and be able to access the program with an administrative account to enabled the components.
Does anyone have any suggestions on what the easiest way to accomplish this?
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Apr 21, 2011
I am reading data from wordpad one by one which records the sale of grocery item by barcode. I want to store it in memory so that after reading the whole file I can calculate the total number of the same items sold by comparing the bar code.
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Oct 2, 2009
I have a small VB program written using VB Express 2008Part of it uses an Access database this all works fine using the custom classes.I want to extend it to use some parameterised settings which I have stored in a table in the same Access database .I want to load these parameters from the table at program startup, then use them later in the code as needed.In SQL I want to execute :-select parameter, parameter_value from system_ parametersthen store this in an array which I want to index on the parameter column/elementAny suggestions on how I can load this data into the array ?
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Feb 23, 2009
Is it possible to store data in memory or a temp file so that if my application crashes information such as text boxes can be restored?
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Jun 24, 2011
I have a problem with a memory stream.
I extract from an archive a Jpeg that's about 256 Kb, load it into a memorystream and display it into a picturebox
when doing that, my app ram ussage grows with 50+ MB
Here's the code
zip.Encryption = EncryptionAlgorithm.WinZipAes128
zip.Password = MainFrm._Pass
Dim str As New MemoryStream
[Code]....
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Jul 4, 2011
I need some informations to do my project. From webservice I get mye data as a List and this is stored in my application in bindingsource.datasource. The list do have many properties which displays as columns in the datagrid successfully.But my problem is how do I store the data in my local memory? You might say just make some local dataset or datatable....,but how do I convert the list to datatable? Or how do I convert bindingsource.datasource to datatable?
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Sep 2, 2009
I want to create an app that does NOT use a database or XML files, just in-memory data. On loading, it will populate one in-memory table with standard data. During operation, it will extract subsets of the data, change it, store it in a different table and display it in a datagrid. how this could be accomplished?
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Feb 27, 2009
I was wondering if there was a way to find out how much memory a data structure too up. So say I declared a list of strings.
Dim theRN As New Dictionary(Of String, Integer)
Say it had 25 elements in it. How to find out how much memory those 25 elements are costing me?
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Jun 14, 2009
I wrote a procedure that builds a DataTable in memory using data stored on our DB2 database. The function builds a Multi-Level Bill of Materials (BoM), meaning that the data cannot simply be queried. The function works great and returns a nicely arranged DataTable object. However, I then need to query the in-memory DataTable against other tables on our server. What would be the best way to approach this problem? Should I make a DataTableAdapter for the Server tables and then build a DataView? I don't have too much experience yet with Data objects. (By the way, I looked into LINQ to DB2 and even installed IBM's addin's, but our server doesn't seem to support it at this time.)
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Aug 3, 2010
I'm trying to do an application for a HTC viva PDA, and i'm a begginer in visual basic programming language so i don't understand much of it.The application is intended to receive data from a data aquisition equipment that connects with the PDA trough bluetooth, i managed to receive data in the PDA, but i don't know how to save all the data that comes from the data aquisition device in a Microsoft excel format or in any other format i can work with.the code that is needed so that the software saves all incoming data to a excel file in the memory card of the PDA?
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Apr 25, 2011
I am having an issue using BinaryFormatter.Serialize. I have this generic extension method to "clone" an object via binary serialization:
[Code]...
This is killing performance. Anything more that about 7 or 8 clones brings the app to a halt. Why would this happen? The USING block ought to ensure the MemoryString is disposed of, right? Shouldn't a new MemoryString be created each time? I would think since the same original Mode object is the source for the serialization, the MemoryString length would be the same.
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Jul 5, 2011
I'm working on a project to extract documents from a SQL Database and writing those documents to a network drive. However some of the files pointed at in the DB are encrypted files (RijndaelManaged)that reside on another network driveI have been able to retrieve, and decrypt the files using streams. Now aving problems saving or converting the Memorystream into an actual file.
Here is my code
Public
Sub ExtractDocument(ByVal ThisDocumentInfo
[code].....
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Jul 6, 2011
I'm working on a project in VB.Net (2010) where I'm extracting files from an Document Management System.The Files reside on the network, and information about the files are in a SQL 2005 Database and have been encrypted with the Encryption Stream (System. Security. Cryptography. Rijndael Managed)i have retrieved the file, and decrypted them, but I'm trying to find out how to write the stream back to a file.I know the file type (which is stored in a SQL DB)I can't find a solution in any of the VB files or the MS site.
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Aug 10, 2010
I am dynamically creating an pdf from a memorystream to a web browser, using itextsharp. It is called via https and it works in IE and Firefox but not Safari or Opera. I don't care about Opera but I do want it to work in Safari though. If I make the call with http it does work (creates the pdf) in Safari but not https
The error I get is The error is: unknown error (CFURLErrorDomain:303).
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Apr 17, 2009
Ive a picture box on a webform. I want to load a picture into from a memorystream. The code im using :
If Me.ComboBox1.SelectedValue.ToString.Trim <> "System.Data.DataRowView" Then
Dim bmpTmp As Drawing.Bitmap = Drawing.Bitmap.FromFile(Me.ComboBox1.SelectedValue.ToString.Trim)
[Code]....
What I'm trying to do is convert a tiff image to a gif and display it in a picturebox on a webform. The source file is deffinatly be found as the commented out line which saves the file to the c: drive works perfectly. However I cant seem to get the picturebox to load with the memory stream.
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Apr 16, 2010
I have some trouble with loading a richtextbox from a memorystream.I have some data in a database table stored as a byte array, I convert it to a string and load it into a memorystream and then I want to load that memory stream in the richtextbox. The application breaks on
Dim tr As New TextRange(rtbTemplate.Document.ContentStart, rtbTemplate.Document.ContentEnd)
though.
[code].....
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Dec 5, 2010
I wrote a piece of code that grabs a fileupload, puts it into a memory stream, converts the main pic, and thumbnail pic, then saves them as jpegs, then updates the database.
Everything works fine, except one little glitch. If the DPI is above 300 then the image doesn't save right. It get's pixelated and blury.
here is the code.
Dim fileLen As Integer
# Dim myStream As System.IO.Stream
# Dim ImgContentType As String
[Code].....
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