The Anti-compilation tool uses. NET Justdecompile to decompile your program code

Original address: http://www.it165.net/pro/html/201310/7383.html

• Objective

  In the implementation of the project will sometimes encounter the need to understand the program code developed by a third party or because it has lost the original code for a long time, because it is written by someone else, so we do not have the original code can be read directly, in this case we need to decompile these programs and DLL files.

  First about what the DLL is, the DLL full name is the dynamic linking library, when you use. NET to develop an application, when you are using a Web site project or a category library, when the project is built, the Bin folder underneath the project produces the All of the class files in the project are compiled into DLL files, and if you are developing a library of shared tool categories, you will be able to provide this DLL file to multiple applications and Web site references.

  But DLL files are compiled files, in general, it is impossible to know the internal composition of the program code, so you have to use the Anti-compilation tool to assist to spy on the original code inside the DLL, in this note, DLL files can be anti-compiled, so do not think that the program is written as a DLL File after the other people can not know the content, but if you really want to hide the contents of the DLL, you can confuse the DLL in the way the DLL files in the program code to make a mess, increase the difficulty of reading after the anti-compilation.

  Create a category Library

  Before deserializing the DLL, let's set up a class library for later decompile use, and open VS to create a category library project, as follows

  
  A salaryhelper Class file is then created to calculate the amount of the payroll funds, as follows
  
  The content of the Salaryhelper Class is simply a way to write a method and return the salary amount, as follows
  
  View Sourceprint?01.namespace Tools02.{03.public class SalaryHelper04.{05.public decimal GetMySalary()06.{07.return 22000;08.}09.}10.}

  Finally, create a consoleapplication to add the Tools category library to the reference, and call the Getmysalary () method to get the salary, as follows
  
  

  View Sourceprint?01.namespace ConsoleApp02.{03.class Program04.{05.static void Main(string[] args)06.{07.Tools.SalaryHelper helper = new Tools.SalaryHelper();08.Console.WriteLine(09.string.Format("My Salary is {0}", helper.GetMySalary().ToString()));10.Console.Read();11.}12.}13.}

  Execution results are as follows
  

  
  

  Using the IL anti-translation tool

  When you install Visual Studio, Windows SDK Tools is typically installed together with an IL anti-translation tool in Windows SDK tools that can decompile DLL files into intermediate languages, as follows

  
  
  
  

  Using the Il anti-translation tool to decompile the DLL into an intermediate language can correspond to the original code, but this intermediate language is very uncomfortable, so we will use other tools to do the anti-compilation action.

  The redgate. NET Reflector and Telerik. NET Decompiler are often heard in the tools used to decompile this two tool, and the. NET Reflector tool is a cost-free tool, but the functionality is pretty powerful, This tool is recommended for frequent in-depth use, while. NET Decompiler is a free anti-compilation tool that does not have the. NET Reflector power, but is free to do it first, and the following is a demonstration of this tool.

  Decompile program code using the Telerik. NET Decompiler Tool

  First go to download URL click free Download download the installation file

  
  After the download is complete, you can install the next step .... Point-to-finish
  
  After the installation is complete, go to "Start"→"All Programs"→"telerik" find Telerik justdecompile program execution, as follows
  
  After opening the Justdecompile program, click on the "open..."→"file (s) ..." to find our tools DLL File Open
  
  After opening, expand the tree directory below and find the Salaryhelper Class we wrote in the Tools namespace
  
  

  After selecting to Salaryhelper, the right splitter window will display the category's anti-compiled program code, as follows

  Anti-compilation program code

  
  The original program code
  
  After the DLL archive is compiled through the. NET Decompiler tool, is it found that the similarity between the two is very high and very cordial:P, and this tool can also convert the anti-compiled program code to other languages of the code, in the top of the tool column can see a C # drop-down menu, click to select C #, VB, IL language
  
  If you are writing the VB language, you can change C # to Visual Basic, the modified code will become the Visual Basic Language Program code, is not very convenient.
  
  With this tool there is also a very important function is to see the. NET Framework implementation of the category library! If the Load framework is selected at open, you can select the installed. NET Framework to read, as follows
  
  This allows you to see the bottom-up implementation of the. NET Framework class Library, which is a simple way to use it for the reference of people in need.

The Anti-compilation tool uses. NET Justdecompile to decompile your program code