API WriteFile Protected Memory Access?
May 22, 2009
I'm currently using an unmanaged library written in C++ and imported via <DLLImport()> to access a dos virtual device driver, and that works fine. However, I'd like to be able to do this via my .NET application (without requiring an accompanying DLL). So, I'm trying to write to the virtual dos device using the kernel32 API and WriteFile, however I receive the error: "Attempted to read or write protected memory."
Mapping to the device with DefineDosDevice and CreateFile (also in the kernel32 API) works fine and returns a valid file handle, however when I attempt to write to the file it fails. I've even tried marshaling the data to an unmanaged block of memory using InteropServices (AllocHGlobal and StructureToPtr) and then writing it from there, however I still receive the same error.
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Mar 12, 2012
I have written a code to take complaints and give that complaint a number automatically. For that i have created a "fno" named variable in settings.but somehow i cant change the value of it and i get this error "Attempt to access protected memory"
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Sep 30, 2010
I've seen other people that have had this exception post on the forums, but none have had it happen like my situation. So I have a multi-threaded VB.net app that will have the protected memory exception occur while it's in the Thread.Sleep call.
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Feb 19, 2008
I have code that connects to queries in an access database.
[code...]
Is the data not filling in because of the schema information not being retirieved? If so, is there a way around that?
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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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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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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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Jan 14, 2011
I have created an event DGVddlSubCategoryComboIndexChanged.as soon as the control come out of this event an error througn
Error:Attempted to read or write protected memory. This is often an indication that other memory is corrupted
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Feb 18, 2011
Have written a simple C++ DLL to provide info back to a calling VB.Net application in a structure passed over to the DLL from VB. On return the structure contains the data from the DLL but gives an error. Have tried changing the field types in C++ (I'm not strong at all in C++) but still getting error. Have provided the two sets of coding for the C++ Dll and the VB.Net program:
API_NKCdll.h file
namespace API
{[code].....
When this VB program is run the DLL crashes on the Interface_Link_ ConfigOperationTest(objInfo)
instruction with:- "Attempted to read or write protected memory. This is often an indication that other memory is corrupt"
the values in objInfo have been altered by the DLL correctly.
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Aug 3, 2010
I have a problem that came with the code conversion of a form-printing-project (available in the following url: http://www.codeproject.com/KB/printing/PrintingFormReport.aspx). I converted the project from C# to VB.Net. But there pops up a very strange exception in a specific part of the code in regard to the class usage that I cannot make out at all. The exception type is System.AccessViolationException and it says (after I translate it from my own language in which the message is give in my pc,into English): "Protected memory was tried to be read or written. This often indicates that the other memory is damaged".
And the part of the code where the exception comes is the following line:
[Code]...
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Dec 3, 2010
i have made application in vb.net which access the MFC Regular dll and it works fine if i run application from windows xp but when i run same dll from windows 7, it gives me above error.
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Dec 5, 2011
I'm getting this error only on my laptop (so far) trying to get the local IP address. I've tried 3 different ways of getting the IP address and each one fails with the same error. This has never happened on my desktop machine but when I moved it to my laptop for additional testing I started getting the error and it further states "This is often an indication that other memory is corrupt". It does however retrieve the ip address but I'd like to get rid of the error. Here's my code and I might add that it never takes the catch ex path in my try-catch code it just stops on the error when running in the IDE.
[Code]...
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Mar 20, 2010
i found out that the program wants to use a part of the memory that he may not use.In my case it only happens when i want to print something.In there i have a PrintPreviewDialog and add a PrintDocument.After that one is loaded it shows the document on the PrintPreviewDialog.Most errors that appear show drawing errors.So, how can i tell windows that the program may use the memory?
A friend of mine thought it was something like this:
[Security].Permissions.FileDialogPermission(Security.Permissions.SecurityAction.Demand) ]
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Jan 30, 2012
Estoy trabajando con una dll para el proceso de cifrar archvios "CryptoVault" y cuan la app que la implementa se encontraba en produccion, en el proceso, de invocar la dll se obtuvo el siguinete mensaje de error:-2147467261 - Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
generando un bloqueo en la app El inconveniente es que no he podido replicar el problema en desarrollo y este caso solo se ha presentado una vez .Gracias de antemano por su colaboración.
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Oct 11, 2011
I have several visual basic 2010 programs. One of the programs I have installed the program on four different windows 7 computers. I get the following error on one of the computers.Then another program I have installed it on 8 computers and I get the same error on 6 of the computers. Here is the error message I get:
2011-10-11 06:19:04 , Main, -2147467261, Attempted to read or write protected memory. This is often an indication that other memory is corrupt., at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
[code].....
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Dec 29, 2010
I'm stuck at dll imports with the c++ dll. Here is the function in the c++ dll that I want to call from my VB.net code.
bool LoadNewTestPlan(const char* szPlanFileName=" ");
I've tried many ways in my VB.net but always getting the error : "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
I have tried passing in byte(), Marshalling with LPStr, SafeArray and nothing works. Here is the example of my code code within the module
<DllImport("HPVKIfc.dll", EntryPoint:="?LoadNewTestPlan@HPVKIfc@@QAE_NPBD@Z", CharSet:=CharSet.Ansi)> _
Public Function LoadNewTestPlan(<MarshalAs(UnmanagedType.LPStr)> ByVal pln As String) As Boolean
End Function
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Feb 10, 2012
I have a Windows application written in Visual Studio .NET 2008 in Visual Basic using the .NET Framework 2.0 A couple clients have been experiencing this very frustrating (but random) error "Attempted to read or write protected memory..." message. I've identified the code specifically when trying to create a new object from a VB6 DLL. [code] The new event of the VB6 object has no code. The error is very random, seems to work more than 99% of the time but every now and then throws an error. Same workstation and user can run the same code numerous times without any issues but eventually the exeption is thrown. I'm at a loss on this and it cannot be reproduced on demand.The VB6DLL is marked COMSelfReg in the MSI. The VB6DLL has not changed but the error seems to be new in the last few weeks. Reinstall the app and the VB6DLL does not resolve.
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Feb 5, 2012
I get this weird error when using Tesseract (in vb.net):
"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
Here is my code:
Try
Dim T As New Tesseract
Using O As New OpenFileDialog
With O
If Not .ShowDialog = DialogResult.Cancel Then
Dim B As Bitmap = New Bitmap(.FileName)
[Code] .....
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Jan 20, 2010
I've made a screen capture program, and I have a program to play back the captured clips (right now there's no sound). All of the data is stored like so:
[Code]....
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Apr 26, 2010
I have gotten this error: Attempted to read or write protected memory. This is often an indication that other memory has been corrupted. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code. Exception Details: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory has been corrupted. The error is at code in red.
[Code].....
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Apr 26, 2010
I am trying to use a .dll in .Net that was written in C++ and was previously used in a VB6 application. I get the error mentioned above. I see lots of posts referring to how VB6's long data type is different in .Net but these fuctions use only integers and strings. Can anyone tell me what is wrong with this?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Module1.lp_checkout("Redistricting", "9.0", 1)
End Sub
[Code]...
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Apr 4, 2010
I am working on an application that starts a few threads every second. The threads don't do much, and everything seemed fine. I monitor the number of threads running, and I have never seen it higher than 4.
Last night I started the app and this morning I had this.
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
The threads can make changes to two List(of Strings) and I had SyncLock's surrounding the code that did that. It has been running for several hours again and all seems well.
My question is that I found a place in the UI thread that was copying the list without the lock. Could that have caused the error?
how to debug something that isn't going to fail conveniently?
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Feb 14, 2011
I started a new project with one form, this form has two comboboxes, combobox1 has datasource (access 2007 database). When I select a value from combobox1 then it sets a datasource on combobox2. Then I click on button to show openFiledialog, it throws exception.
"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
I am giving link to check its solution file. If I use database in access 2003 format it works fine!! [URL].
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May 29, 2010
When i run my projekt on my Pc , on my server then all works fine. Then i have try my project on another server, and get this error in almost. all my forms: Attempted to read or write protected memory, this is often an indication that other memory is corrupt. What to do?
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Aug 20, 2009
I receive random AccessViolationException on client machines. I have captured the exception text and have pasted it below. Unfortunately this error is not happening on code that I have written it appears to be happening when the .NET is trying to draw a group box on the form. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.at System.Drawing.SafeNativeMethods.Gdip.GdipDrawLineI(HandleRef graphics, HandleRef pen, Int32 x1, Int32 y1, Int32 x2, Int32 y2)at System.Drawing.Graphics.DrawLine(Pen pen, Int32 x1, Int32 y1, Int32 x2, Int32 y2)
[Code]...
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Apr 18, 2009
i am trying to open and navigate to second web browser when i recieve this error; here are the details;
System.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"
StackTrace:
[Code]...
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