Error Has No Valid Clr Header And Cannot Be Disassembled
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programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is a CLR header in .net applications? up vote 1 down vote favorite While using the ildasm.exe tool for disassembling other .Net applications, I came across the following line. program.exe has not valid CLR Header and cannot be disassembled But when I tried to disassemble my code, it didn't show any error, and disassembled the code easily. As a result I am curious about what is a CLR Header and what can be the advantages/disadvantages of having a valid CLR Header for your assembly? Can anybody please answer the above questions? I checked the msdn, but couldn't find much information on the topic. c# .net decompiling disassembling share|improve this question asked Jan 21 '14 at 19:10 Pratik Singhal - ps06756 2,41322050 In what language did you write the application? –Pete Garafano Jan 21 '14 at 19:14 I wrote my application in C# –Pratik Singhal - ps06756 Jan 21 '14 at 19:26 The "other .Net applications" must not have been .NET applications. –Scott Chamberlain Jan 21 '14 at 19:30 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted ILDASM.exe is meant to disassemble CLR code. If there is not a valid CLR header, it usually means that the executable was written in another language and compiled natively. share|improve this answer answered Jan 21 '14 at 19:13 Justin Niessner 179k19300438 So, is there any way to protect my .Net app from being disassembled. –Pratik Singhal - ps06756 Jan 21 '14 at 19:15 2 There is no way to prevent any program from being disassembled. You can only make it harder to figure out what the disassembled code is doing by using Code Obfuscation (either through a automated tool or hiring a expert on it as a consultant for your project). See "How to protect .Net exe from Decompiling/Cracking" –Scott C
XenDesktop 7.x Evaluations SysTools Export Notes Software Testdrive What is Software TestDrive? PowerShell Basic Question and Answers Deleting Files and Folders Copying File/Folder(s) Listing only Files/Folder(s) Executing Commands Unix like Head & Tail Implementing detailed logging Mapping a Free Drive Letter Convert PS script into an Exe Process Explorer Password Generator SQL List all active connections List all DBs Sizes in MBs List all DB names in Oracle Kill all sessions connected http://stackoverflow.com/questions/21267011/what-is-a-clr-header-in-net-applications to SQL DB Search a complete SQL DB Convert UTC Time to Local Time Saving each row from SELECT results set dbo vs. db_owner Others Php - What is my IP Address? ASP - What is my IP Address? Password Generator - Simple String Compiling Perl Modules Viewing and Analyzing http://www.gunnalag.com/2014/06/02/viewing-and-analyzing-the-executables-execonsole-applications-developed-in-net-without-source-code/ the Executables (.exe)/Console Applications developed in .Net without Source Code gunnalagJune 2, 2014August 12, 2014 Most of the .Net developers would probably know, how to view or analyze a third party console application that is developed in .Net. This capability/skill would be required for various other roles like application re-packagers/integrators and Security Analysts/Researchers, etc.,. Here I’d be briefing about how to view the compiled Intermediate Language (IL) (Microsoft calls as a managed code) code of any executable (.exe application) that is developed in .Net. Microsoft provides a tool named Ildasm.exe (Microsoft Windows Intermediate Language (IL) disassembler). This tools shipd along with the .Net developer IDE Visual Studio and you can have this downloaded from Microsoft. About Intermediate Language (IL) disassembler: This tool is usually located in …\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\Ildasm.exe of your Visual studio Installation folder. Example: C:\Temp\MyConsoleApp>which Ildasm.exe/cygdrive/c/Program Files (x86)/Microsoft SDKs/Windows/v8.1A/bin/NETFX 4.5.1 Tools/Ildasm.exe C:\Temp\MyConsoleApp> Using Intermediate Language (IL)
in MSIL In the Start menu's Run dialog box, type ildasm and click OK. You'll see a nondescript application with a few menu options. At this point, from the File menu, click Open. http://www.brainbell.com/tutors/C_Sharp/Hello_World_in_MSIL.htm When the File Open dialog box appears, browse to the folder containing the HelloWorld.exe application you created earlier (on Chapter 3) and select it. As shown in Figure 3-4, things start to look a bit more https://community.thingworx.com/thread/2227 promising. - Figure 3-4 ILDASM lets you spelunk in the caverns of the manifest and the IL opcodes that make up your .NET application.- Notice the tree view that ILDASM uses to list the contents error has of a managed binary. Figure 3-5 shows the various icons used in the ILDASM tree view to describe the parts of a .NET application. As you can see by cross-referencing the icons shown in Figure 3-5 and the "Hello, World" program in ILDASM, HelloWorld.exe consists of a manifest, one class (HelloWorld), two methods (a class constructor and the static method Main), and a bit of class information. - Figure 3-5 The different error has no icons used to denote the parts of a .NET application in ILDASM.- The most interesting part of "Hello, World" is in the Main method. Double-click the Main method in the ILDASM tree view, and ILDASM will present a window displaying the MSIL for the Main method, as shown in Figure 3-6. - Figure 3-6 To look at the generated MSIL for a method, open the binary in ILDASM and double-click the method.- "Hello, World," even in MSIL, isn't too exciting, but you can learn a few facts about the generated MSIL to carry over to any .NET application. Let's look at this method line by line to see what I mean. .method public hidebysig static void Main() il managed { .entrypoint // Code size 11 (0xb) .maxstack 8 IL_0000: ldstr "Hello, World" IL_0005: call void [mscorlib]System.Console::WriteLine (class System.String) } // end of method HelloWorld::Main The first line defines the Main method by using the .method MSIL keyword. We can also see that the method is defined as being public and static, which are the default modifiers for the Main method. In addition, however, we see that this method is defined as managed. This is an important distinction because you can also write "unmanaged," or "unsafe," code in C#. Chapter 17, "Interoperating with Unmanaged Code,
blank message. Please type your message and try again. 7 Replies Latest reply on Nov 6, 2015 1:20 PM by aanjan twApi_SetSelfSignedOk() equivalent in .NET SDK? miikkae Sep 2, 2015 1:24 PM I'm trying to create a test program with .NET SDK but it doesn't seem to be working.I've got a working version ready made with C SDK but we'd need to get the actual program working on .NET SDK while there're other components requiring it.With C SDK I had problems without twApi_SetSelfSignedOK() function call so I thought if that'd be the case here also. Only similar method I found from .NET SDK is calling ClientConfigurator.ignoreSSLErrors(true) but the code ain't working with that.Otherwise the codes are pretty similar, both a bit modified from SteamSensor examples (property changes etc). .NET program doesn't even get to the communication logs on ThingWorx as opened WebSocket, as didn't the program with C without the twApi_SelfSignedOK() call.Only thing that seem to matter I get by debugging the code with Visual Studio was this line in the outputs (no errors): A first chance exception of type 'System.Security.Authentication.AuthenticationException' occurred in System.dll Not sure if this means anything related to connection problems but it's a guess.While running the code, ConnectedThingClient.start() works without throwing any Exceptions but it's not connected. Tried seperately the .connect() method but that does no difference. 183Views Tags: none (add) .net sdkContent tagged with .net sdk, sslContent tagged with ssl, self-signedContent tagged with self-signed, twapi_selfsignedok equivalentContent tagged with twapi_selfsignedok equivalent, connection problemContent tagged with connection problem This content has been marked as final. Show 7 replies Re: twApi_SetSelfSignedOk() equivalent in .NET SDK? jeff Sep 2, 2015 2:36 PM (in response to miikkae) I believe the specific function you are looking for is AcceptSelfSignedCertificates(