How to prevent decompilation of vb.net exe or dll? - .NET (Core and Framework) Discussion Boards

Re: adding Launch conditions

Eddy Vluggen19-Sep-09 3:19

Eddy Vluggen

19-Sep-09 3:19

The best verification is a test. I'm not the author of the article, and I haven't created any setups recently.

I are Troll Smile | :)

Re: adding Launch conditions

Raj Jayaswal19-Sep-09 3:21

Raj Jayaswal

19-Sep-09 3:21

No worries. Thanks you Eddy

Fixed length record file library

Brady Kelly18-Sep-09 2:07

Brady Kelly

18-Sep-09 2:07

I'm looking for a .NET (much preferably open source in C#) library for dealing with fixed length field text files. It wouldn't be too much to write one, but existing, tested work is always nicer, to start with.

I will be extracting data in fixed length fields from files produced by a PBX. Each PBX has its own file format, as well a set of record formats. I'm looking for a library with a nice a simple way of using dynamic file and record formats, e.g. read from an INI or XML file.

I have been trying for weeks to get this little site indexed. If you wonder what it is, or would like some informal accommodation for the 2010 World Cup, please click on this link for Rhino Cottages.

on secondary topic

Luc Pattyn18-Sep-09 2:21

Luc Pattyn

18-Sep-09 2:21

Hi Brady,

I was told Google insists XHTML to be correct before it is willing to index.
yours isn't, see here[^].

So IMO it isn't about meta tags. yet.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Local announcement (Antwerp region): Lange Wapper? Neen!

Re: on secondary topic

Brady Kelly18-Sep-09 3:12

Brady Kelly

18-Sep-09 3:12

Ah, thanks. I'll fix all those train smash errors and hopefully placate the Might One. I just wonder why they couldn't tell me in my Webmaster Tools data.

I have been trying for weeks to get this little site indexed. If you wonder what it is, or would like some informal accommodation for the 2010 World Cup, please click on this link for Rhino Cottages.

Re: Fixed length record file library

Henry Minute18-Sep-09 3:31

Henry Minute

18-Sep-09 3:31

Hi Brady,

There is a library here on CP that does fixed length or delimited files.

Search the articles for FileHelpers. I would give you a link but I'm stuck on 53.6 Kbs for the moment and everything takes so much time that I can't be arsed! Big Grin | :-D

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Failed to decrypt Password using RsaProtectedConfigurationProvider

Sourabh N18-Sep-09 1:27

Sourabh N

18-Sep-09 1:27

Hi,

I have a .net solution that contains Windows Service Application. This application has app.config file that stores the connection strings and Appsettings. To encrypt these sensitive information, i am using the protectsection and unprotectsection with 'RsaProtectedConfigurationProvider'. These methods are written in a class "UsingRsaProtectedConfigurationProvider", in the WindowService project.

I have created a console application in the same solution. These console application calls the protectsection() method of class "UsingRsaProtectedConfigurationProvider" while encrypting. These console application is executed first to encrypt the app.config values.

However, when i start the windows service, it gives me an error "Failed to decrypt using provider 'RsaProtectedConfigurationProvider'. Error message from the provider: The RSA key container could not be opened."

I am pasting the inner exeception here. Please help me as i am unable to proceed.

<Snip>

System.Configuration.ConfigurationErrorsException was unhandled by user code

Message="Failed to decrypt using provider 'RsaProtectedConfigurationProvider'. Error message from the provider: The RSA key container could not be opened. (D:\\ContentIngestionTools\\RSSIngestorWS\\bin\\Debug\\NDNrssIngestor.exe.Config line 16)"

Source="System.Configuration"

BareMessage="Failed to decrypt using provider 'RsaProtectedConfigurationProvider'. Error message from the provider: The RSA key container could not be opened."

Filename="D:\\ContentIngestionTools\\RSSIngestorWS\\bin\\Debug\\NDNrssIngestor.exe.Config"

Line=16

StackTrace:

at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)

at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)

at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)

at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)

at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)

at System.Configuration.BaseConfigurationRecord.GetSection(String configKey, Boolean getLkg, Boolean checkPermission)

at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)

at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName)

at System.Configuration.ConfigurationManager.GetSection(String sectionName)

at System.Configuration.ConfigurationManager.get_AppSettings()

at System.Configuration.ConfigurationSettings.get_AppSettings()

at RSSIngestorWS.RSSService.OnStart(String[] args) in D:\ContentIngestionTools\RSSIngestorWS\RSSService.cs:line 49

at System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback(Object state)

InnerException: System.Configuration.ConfigurationErrorsException

Message="The RSA key container could not be opened."

Source="System.Configuration"

BareMessage="The RSA key container could not be opened."

Line=0

StackTrace:

at System.Configuration.RsaProtectedConfigurationProvider.ThrowBetterException(Boolean keyMustExist)

at System.Configuration.RsaProtectedConfigurationProvider.GetCryptoServiceProvider(Boolean exportable, Boolean keyMustExist)

at System.Configuration.RsaProtectedConfigurationProvider.Decrypt(XmlNode encryptedNode)

at System.Configuration.ProtectedConfigurationSection.DecryptSection(String encryptedXml, ProtectedConfigurationProvider provider)

at System.Configuration.Internal.InternalConfigHost.System.Configuration.Internal.IInternalConfigHost.DecryptSection(String encryptedXml, ProtectedConfigurationProvider protectionProvider, ProtectedConfigurationSection protectedConfigSection)

at System.Configuration.Internal.DelegatingConfigHost.DecryptSection(String encryptedXml, ProtectedConfigurationProvider protectionProvider, ProtectedConfigurationSection protectedConfigSection)

at System.Configuration.BaseConfigurationRecord.CallHostDecryptSection(String encryptedXml, ProtectedConfigurationProvider protectionProvider, ProtectedConfigurationSection protectedConfig)

at System.Configuration.RuntimeConfigurationRecord.CallHostDecryptSection(String encryptedXml, ProtectedConfigurationProvider protectionProvider, ProtectedConfigurationSection protectedConfig)

at System.Configuration.BaseConfigurationRecord.DecryptConfigSection(ConfigXmlReader reader, ProtectedConfigurationProvider protectionProvider)

InnerException:

</Snip>

How to prevent decompilation of vb.net exe or dll?

savitri18-Sep-09 0:25

savitri

18-Sep-09 0:25

Hi All,

I am new to this forum. We did one project in vb.net. I do not know how to prevent from decompilation? One way is there to prevent, is using third party softwares but i do not want to use those softwares. Is there any way to prevent through assemply level coding and from any way means without using third party softwares? Please give me some solution to prevent my code from decomipilation.

Thanks in Advance,
Savitri

Re: How to prevent decompilation of vb.net exe or dll?

Not Active18-Sep-09 1:51

Not Active

18-Sep-09 1:51

savitri wrote:
how to prevent from decompilation?

Simply put, you can't. Even an obfuscator won't prevent it, only make the code more difficult to read.

only two letters away from being an asset

Re: How to prevent decompilation of vb.net exe or dll?

Arun Jacob18-Sep-09 2:03

Arun Jacob

18-Sep-09 2:03

If you are having Visual Studio its having a obfuscation tool thats Dotfuscator.By using that you can obfuscate your code.It doesn't means that your code is 100% safe but dotfuscator will make your code difficult to understand after decompilation.So you can try that.

Arun Jacob
http://codepronet.blogspot.com/

Re: How to prevent decompilation of vb.net exe or dll?

bindasrakesh29-Nov-10 21:59

bindasrakesh

29-Nov-10 21:59

By design .NET embeds rich Meta data inside the executable code using MSIL. Anyone can easily decompile your DLL back using tools like ILDASM (owned by Microsoft) or Reflector for.NET which is a third party. Secondly there are many third party tools which make this decompiling process a click away. So any one can easily look in to your assemblies and reverse engineer them back in to actual source code and understand some real good logic which can make it easy to crack your application.

The process by which you can stop this reverse engineering is using “obfuscation”. It’s a technique which will foil the de compilers. There are many third parties (XenoCode, Demeanor for .NET) which provide .NET obfuscation solution. Microsoft includes one that is Dotfuscator Community Edition with Visual Studio.NET

lklklhjsdg

MOSS

Gunjan pandey17-Sep-09 23:09

Gunjan pandey

17-Sep-09 23:09

Dear's
ALL
From where we can Complete
Microsoft Office SharePoint Server Certification(MOSS) in development
or The Microsoft Certified Technology Specialist (MCTS)
Inform me and Certification fee,Books.

Re: MOSS

Richard MacCutchan17-Sep-09 23:55

Richard MacCutchan

17-Sep-09 23:55

Did you think of asking Microsoft?

Re: MOSS

Not Active18-Sep-09 1:50

Not Active

18-Sep-09 1:50

There is a SharePoint forum here

only two letters away from being an asset

how to pass excel application object to automation object?

SRKSHOME17-Sep-09 20:50

SRKSHOME

17-Sep-09 20:50

Hi,

I am working on shared add-in in c# for Excel. Let us consider 3 components A,B,C. Where A is a Shim,B is Shared an add-in(used IDTExtensibility interface) which creates all tool bars, menu items for Excel and C is an automation add-in which contains UDFs.

I have static property in Automaion add-in(C) which set/gets Excel Application object. Whenever OnConnection(..) of shared add-in is called from the framework, I am setting the Excel application object using this property. So When I type some UDF in Excel, it uses this Excel application object for further work on Excel.

Recently I tried to remove the Shim and put the VSTO on it. When I use VSTo, it doesn't use shared add-in.Here also I set the Excel application object by using static property. Now I have I enabled this Auotomation add-in(add-in->Options->Automation Tab).But when I type some UDF in Excel cell, excel object is not available that is set from VSTO.How do I pass reference to Excel object to Automation add-in so that the same Excel Object is available in Automation add-in when we type some UDFs.

What I observed here is VSTO and Automation add-ins are working in different AppDomains.

Please help me.
Thanks.

Re: how to pass excel application object to automation object?

Richard MacCutchan17-Sep-09 22:54

Richard MacCutchan

17-Sep-09 22:54

see here[^]

How to deserialize on top of an existing object?

RichardM117-Sep-09 16:49

RichardM1

17-Sep-09 16:49

I am sending objects across the wire, and receive some back.
I can identify if an object was sent and returned, or if it is a new object.
For returned objects, I would like to substitute the original object into the deserialization process in the OnDeserialized method of my framework's base class.
This allows all references to the object that got sent to remain intact, without having to get a new deserialized object and then copy all it's fields onto the old object.
----------------------
Functionally, I add a class above the current base class, with two fields:
Int64 ObjectSerialNumber; always unique.
bool ObjectIsNew; which is set to true on creation, and false when it finishs deserializing (see below).
When objects are serialized, they are stuck in a dictionary hooked to that comms session, hashed by ObjectSerialNumber.
In the base OnDeserialized, I have already deserialized ObjectSerialNumber, and ObjectIsNew, but none of the other fields.
If ObjectIsNew != true, I get the original object from the dictionary and insert it in place of the object that the stream is being deserialized into.
If ObjectIsNew == true, I set ObjectIsNew = false and continue using the one provided by the deserializer.
------------------------
The only fly in the ointment is that "insert it in place of the object" really means:

this = originalObject;

I have not found a way to do this in .NET. Anyone have an idea of how to go about that?
Is there a way into the fields that are hidden in 'this'?
The whole framework is already 'unsafe'.
Thanks
Richard

Silver member by constant and unflinching longevity.

LinkDemands and FxCop [modified]

Gideon Engelberth17-Sep-09 4:54

Gideon Engelberth

17-Sep-09 4:54

I ran FxCop over my assembly and got the warning about not indirectly exposing methods with LinkDemands (CA2122 help link). The original code was like this (Marshal.GetLastWin32Error is the method with the LinkDemand):

Dim extendedStyle As Integer = NativeMethods.GetWindowLong(hwnd, GWL_EXSTYLE)
If extendedStyle = 0 Then
     Throw New System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error())
End If

I then moved the exception throwing into a method on the NativeMethods class and the code now looks like this:

Dim extendedStyle As Integer = NativeMethods.GetWindowLong(hwnd, GWL_EXSTYLE)
If extendedStyle = 0 Then
    NativeMethods.ThrowWin32Error()
End If

<SecurityPermission(SecurityAction.Demand, UnmanagedCode:=True)> _
Friend Module NativeMethods
    Friend Sub ThrowWin32Error()
        Throw New System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error())
    End Sub

    'other code here
End Module

As expected, the original method is no longer flagged by FxCop. I expected the new NativeMethods.ThrowWin32Error to be flagged, but it is not. Neither the NativeMethods class nor the method have any attributes. Does anyone know more about LinkDemands or this warning that could provide an explanation for why this is not flagged? (EDIT: I am getting the FxCop warning now without the attribute.) Is applying a SecurityPermission attribute the right way to deal with that warning?

I am getting the same message for the serialization constructors of Exceptions that call GetObjectData, and I assume that whatever I end up doing for this situation will need to be done for them too.

modified on Thursday, September 17, 2009 1:51 PM

Getting the current Windows Session user from a different User Domain

Tristan Rhodes16-Sep-09 6:30

Tristan Rhodes

16-Sep-09 6:30

Hi Guys,

I have a service running under a restricted access user (say - AppUser) that is not related to the user who is currently logged in to windows (say - JSmith).

I'm trying to get the user name of the currently logged in user (JSmith) from an application running under AppUser.

How would i go about doing this?

Regards

Tris

-------------------------------

Carrier Bags - 21st Century Tumbleweed.

VS SDK: How to apply additional formatting after (not instead) default colorization.

Sergiy Sakharov16-Sep-09 3:58

Sergiy Sakharov

16-Sep-09 3:58

Hello,

I'm trying to change background color of some line in a .cs file.

MSDN seems pretty straightforward regarding custom colorization: one has to define custom colorizer, and probably some font items. But the idea behind it is adding new language highlighting rather than modification of predefined one.

------
It could be a wrong forum, however answer is:

IVsTextLineMarker should be used in this case. For more details see: MSDN forums[^]

Best Regards,
Sergiy

modified on Wednesday, September 16, 2009 1:32 PM

upzip a folder in vb.net

nicetohaveyou15-Sep-09 21:36

nicetohaveyou

15-Sep-09 21:36

Most simple code to unzip folder in vb.net

Re: upzip a folder in vb.net

Eddy Vluggen16-Sep-09 5:16

Eddy Vluggen

16-Sep-09 5:16

nicetohaveyou wrote:
Most simple code to unzip folder in vb.net

Why, that's phrased like a contest Smile | :)

You could use the DeflateStream[^] that comes with the Framework, or the GZipStream[^].

If you can use third-party libraries then you have, again, two choices;
* DotNetZip[^]

using (ZipFile zip = ZipFile.Read(sourcePath)
 {
   zip["myFile.dll"].Extract();
 }

Or;
* #ZipLib[^]

using ICSharpCode.SharpZipLib.Zip;

FastZip fz = new FastZip();        
fz.ExtractZip("myFile.dll", "C:\TEMP", "");

I are Troll Smile | :)

Web Camera settings

Raj Jayaswal15-Sep-09 6:56

Raj Jayaswal

15-Sep-09 6:56

hi forum,
My question is that is there any method to control the webcam settings such as contrast, brightness, etc. in vb.net?

Re: Web Camera settings

Manas Bhardwaj16-Sep-09 8:45

Manas Bhardwaj

16-Sep-09 8:45

Raj Jayaswal wrote:
My question is that is there any method to control the webcam settings such as contrast, brightness, etc. in vb.net?

The simple answer is NO.
VB.Net does not has any supporting API/class for webcamera. But you can try to look at the internet, there are quite a number of open source libraries which do this.
Good Luck. Smile | :)

Manas Bhardwaj
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Do Microsoft .NET Certificates Expire ?

Hristiyan15-Sep-09 2:48

Hristiyan

15-Sep-09 2:48

Good day,

Today i took the MCTS 70-536 exam with flying colors, but unfortunately i heard the secretary saying that she "thinks" that the Microsoft .NET certificates expire after two years.

I googled for prove but i couldn't find anything on that topic.

I'm specificly asking for the "MCTS: .NET Framework 3.5, Windows Forms Applications" certificate

Best regards, Hris

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