VBReFormer 6.4 Released with support of for/next and array-related statements decompilation

As I annouced in a previous post, we just release VBReFormer 6.4 (Free Edition and Professional Edition), which improve such a lot the decompiler engine. This is one of the most important release I've done until now.

The decompiler engine has been improved as it can now perform variable type determination. This means that VBReFormer is now able to guess the type of a variable and argument from its use inside the code.

We also added for/next support, and multi-dimensional array-related statements decompilation.


Original source code:

Private Sub Command1_Click() Dim myArr1(0 To 20, 14 To 50, 25 To 45) As String MsgBox UBound(myArr1) MsgBox LBound(myArr1) Dim myArr2() As Long ReDim myArr2(0 To 40, 30 To 55) MsgBox UBound(myArr2) MsgBox LBound(myArr2) End Sub Recovered source code:

Private Sub Command1_Click() Dim var_2 (0 To 20, 14 To 50, 25 To 45) As String var_3 = MsgBox(UBound(var_2, 1), 0) var_8 = MsgBox(LBound(var_2, 1), 0) Dim var_9() As Long ReDim var_9(0 To 40, 30 To 55) var_10 = MsgBox(UBound(var_11, 1), 0) var_12 = MsgBox(LBound(var_11, 1), 0, , , var_13) End Sub


Lot of other improvement has been made, here is the full details:

New: Improved support of file I/O operation statements:

__vbaGetOwner4 __vbaGetOwner3 __vbaGet3

New: Improved support of error statements:

__vbaOnError __vbaResume __vbaGenerateBoundsError

New: Improved support of array-related statements:

__vbaAryLock __vbaRedim __vbaRedimPreserve __vbaAryConstruct2

New: Improved support of FOR / NEXT loop-related statements:

__vbaForEachAry __vbaNextEachAry __vbaExitEachAry __vbaForEachCollVar __vbaForEachVar __vbaForEachCollAd __vbaNextEachCollVar __vbaNextEachCollAd __vbaExitEachColl __vbaExitEachVar __vbaCyForInit __vbaVarForInit __vbaVarForNext __vbaRaiseEvent __vbaErase

New: Improved support of internal system statements:

__vbaSetSystemError __vbaFreeVar __vbaFreeObj __vbaFreeStr __vbaFreeStrList __vbaFreeObjList __vbaFreeVarList

New: Improved support of string statements:

rtcCompareBstr rtcInStrChar

New: Other improved statements:

__vbaObjIs __vbaStopExe VarPtr

New: support of type consistency at decompilation time, this means that the decompiler engine can now be determinist about variable type

New: Support of OLE, PropertyPage, and UserDocument elements in GUI recovery & edition


New: Support of COM / OLE property edition

New: New settings windows that allows to:

         edit colors of source code’s syntax highlighting          choose if you want only Visual Basic, assembly, or both (mixed) differently for viewing and saving          choose your own prefix for private method and private variable name          load (or not) the project in Visual Basic, or the destination folder once you saved it

Fixed issue on Import Table use

Fixed issue on Font properties in property editor and GUI edition

Fixed issue on saving settings

Fixed issue on default language setting (French was setup by default, now replaced by English language).

Fixed issue on VBReFormer setup packages for x64 Windows operating system

Fixed issue at loading some ActiveX libraries ("Run-time error `339`; Component `MSCOMCT2.OCX or one of its dependencies not correctly registered. “)

Fixed issue on resource viewer

Fixed issue on re-opening a VB6 application / library previously edited with VBReFormer Pro

Fixed issue on resource image preview, export, and replacement

Fixed issue on false negative detection of VBReFormer by antivirus or browsers as malicious software

Fixed "Object not found" exception at opening some executable

Fixed “About” dialog

VBCompTester discontinued: Use VBReFormer Free Edition instead

You all know that Visual Basic 6 allows you to choose between Native Code and P-Code compilation.

Because one of the most recurrent questions of my customers was if VBReFormer Pro will support decompilation of their application, due to the simple fact they don’t know if it was compiled in Native or P-Code, I've made a tool called “VBCompTester”, some years ago, which show you if a binary file (.exe, .dll, .ocx, etc.) was compiled using Visual Basic 5 / 6 and with what compilation mode (native or P-Code ?).

I have also made this tools because VBReFormer Free edition was not supporting decompilation at all, while VBReFormer Pro does. Then, you were not able to know, by using the free version, if the Pro one will support your application.

But the past year I decided to make VBReFormer Free and VBReFormer Professional from the same wood in order to give a real idea of VBReFormer Professional capabilities by using the free version.

Then, since June 2014, the both version of VBReFormer, free and pro, have the same features, but limited in the case of the Free edition.

Here are the main limitation of the Free Edition:

decompilation engine will not show name of code-inside object property in Free Edition. It will show something like “Me.[PROPERTY NOT VISIBLE IN FREE EDITION]” or “Me. [METHOD NOT VISIBLE IN FREE EDITION](param1, param2, param3)” in free edition; the feature of edition of GUI interface is not supported in Free Edition.

Since the Free Edition can now be used has a demonstration version of the Professional Edition of VBReFormer, I decided to discontinue the tool VBCompTester.

You can, and I advise you to use VBReFormer Free edition in order to know if your binary is made with Native or PCode option.

If you want to know more about the difference between the both compilation modes, you can read the following article: The truth about Native Code VS P-Code.

See you very very soon with a new version of VBReFormer which is gonna be the most powerful version I have made. :)

VBReFormer 6.2 Released with support of Unicode System & +11000 Win32 APIs

I’m delighted to announce that we’ve released VBReFormer 6.2 Professional Edition.

New features and improvements in this release include:

- Support of Windows UNICODE settings & applications in disassembling, decompiling, and editing Visual Basic 5 & 6 applications ;

- Exclusive support of +9000 others Win32 APIs (up to a total of 11 000 APIs) ;

- Support of Left & Right properties for ActiveX / OLE related objects ;

- Support of GUI interface Font properties edition ;

- Improved support of If / Then / Else / End If, Select Case […], and Loop / While statements ;

- Improved support of GUI Code for ActiveX / OLE related objects .


This release also include major fix for issues :

- Fixed issue in saving edited Visual Basic application with UNICODE environment ;

- Fixed issue in recovering executable resource images ;

- Fixed issue in « Options » dialog, taking account of your choice about APIs related decompilation ;


- Fixed issue in adding a new property to a GUI object .

New website: Decompiler-VB.Net V3.0 Launch !

I’m very excited to have finally launched the new version of Decompiler-VB.Net website (V3.0) after a full year of development!

Yes, I finally decided to communicate after a long period of development and testing. It’s all been completely re-coded from the ground up, and definitelly yes, the new website is officially up!

Totally renovated and multi-language, it will allow me to fulfill your orders faster, to answer your questions more quickly and it will allow you to track and verify your orders and licenses more easily.

The new website is currently translated in French and English, but we plan to add many other languages. Italian, Spanish, and Chinese language will be soon available.

My goals with the new website were to make it faster, easier to navigate for users, and easier for us to manage and update.

The website will now be updated more regularly to improve your comfort by being clearer and more interactive.


Have fun and see you soon !

The truth about P-Code


This article has been written to provide a better and essential information to users of decompilers since I got many complaints from customers of others Visual Basic decompilers because their application weren’t recovered by these decompilers.

The reason is, when you write a Visual Basic 6.0 application you may choose a P-Code or Native code compilation, then your application will be compiled to P-Code or Native code which are very different approaches of compilation, so the decompilation will be different too.

There is a question you may absolutely ask yourself when you need a decompiler for a specific application: Is my application compiled into native or P-Code mode ?

The main problem is that a lot of users got a P-Code decompiler in order to decompile their application, but released with Native Code…

In fact, P-Code decompiler are today almost useless because 90% of Visual Basic 6 application are released with Native Code mode. This article will explain first the difference between P-Code and Native code, and then explain why the rate of Native code application is so important compared to P-Code applications. I. P-Code Versus Native Code

When you write a line of code in the IDE, Visual Basic breaks it down into expressions and encodes the expressions into a preliminary format called op-codes. In other words, each line is partially precompiled as it is written. Some lines contain shared information that cannot be precompiled independently (mainly Dim statements and procedure definitions). This is why you have to restart if you change certain lines in break mode. The opcodes are compiled into p-code instructions when you compile (in the background if you have the Compile On Demand and Background Compile options set).

At run time, the p-code interpreter works through the program, decoding and executing p-code instructions. These p-code instructions are smaller than equivalent native code instructions, thus dramatically reducing the size of the executable program. But the system must load the p-code interpreter into memory in addition to the code, and it must decode each instruction.

It’s a different story with native code. You start with the same opcodes, but instead of translating to p-code instructions, the compiler translates to native instructions. Because you’re not going to be expecting an instant response while stepping through native code instructions in the IDE, the compiler can look at code from a greater distance; it can analyze blocks of code and find ways to eliminate inefficiency and duplication. The compiler philosophy is that, since you compile only once, you can take as long as you want to analyze as much code as necessary to generate the best results possible.

These two approaches create a disjunction. How can you guarantee that such different ways of analyzing code will generate the same results? Well, you can’t. In fact, if you look at the Advanced Optimizations dialog box (available from the Compile tab of the Project Properties dialog box) you’ll see a warning: "Enabling the following optimizations might prevent correct execution of your program." This might sound like an admission of failure, but welcome to the real world of compilers. Users of other compiled languages understand that optimization is a bonus. If it works, great. If not, turn it off.

On the other hand, very few developers are going to be used to the idea of working in an interpreter during development but releasing compiled code. Most compilers have a debug mode for fast compiles and a release mode for fast code. Visual Basic doesn’t worry about fast compiles because it has a no-compile mode that is faster than the fastest compiler. You get the best of both worlds, but it’s going to take a little while for people to really trust the compiler to generate code that they can’t easily see and debug.

Source : http://vb.mvps.org/hardcore/html/p-codeversusnativecode.htm II. Proportion of P-Code application in the world

The amount of P-Code developed application is very small compared to Native Code developed application (90% of Visual Basic 6 applications are compiled with Native Code setting -default setting in VB6-), that is one of the reason why I decided to develop VBReFormer more for Native Code than for P-Code.

The massive number of Visual Basic Native application compared to P-Code applications is probably more important due to the fact the default value in the compiler is set up to « Native Code », and of course because native application are almost fast than C++ applications contrary to P-Code applications.

Before choosing a decompiler you must know if it was released for Native application, or for P-Code applications, and if your application was released in P-Code or Native mode.

Note that P-Code is more easy to decompile than Native Code because of it’s high level property.

VBReFormer - Decompiler for Visual Basic
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You lost the source code of your Visual Basic application ?

VBReFormer is a powerful and essential recovery tool for Visual Basic application.

Decompiler, disassembler and design editor at the same time, VBReFormer is an essential tool for professionals and companies who work with older versions of their Visual Basic 5/6 applications.

VBReFormer will help you to rewrite your application by recovering all necessary information, design code and partial native Visual Basic code of your application.

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