okay, so i dont really know much about DLLs. but i need to edit some of them. ones that seem like archive files.
such as: firefox's xul.dll, windows/twain_32.dll
when i tried to open them in .NET Reflector, it couldnt open them. and a really downvoted answer on here made me realize they can be opened with 7zip, and seem to have files inside.
i can extract the files, but cant edit the dll, and i dont know how to create a dll like this. i dont have visual c++ or basic, and i dont know if i could do this with them.
thank you in advance, or how to say
A dll file usually contains program code (that is: binary code you can not easily understand). Some dll files may also contain resources, which can be sometimes edited with a resource editor (such as ResourceHacker).
dll files are no archives and their primary usage does not include holding files. Resources normally are rather small data elements such as icons.
Edit: If you open a dll file in 7zip, you will see some virtual files (which are no real files but sections of the binary object file, see symbol table and relocation table in object file for example) along with a virtual folder .rscs (abbreviation for "resources") that contains the mentioned resources you can edit with a resource editor. Again, remember these are not files. 7zip only displays them in a way you may think of files.
The object code inside of .text, .data and .reloc contains binary program code and initialization data along with the reallocation table. It makes no sense to edit those information unless you use a disassembler, can understand the generated assembler code, know about the pitfalls of disassembling, make senseful changes and are able to reassemble the code.
Not that even if you did so, you'd apply the disassembler to the whole object file instead of single sections.
Related
In VB6 I had (example) the following directories:
CommonCode
Parser
OrbitalDynamics
DnD
RelativisticBang
The first is standard inclusions I use (constants.vb, science.vb, constAstro.vb, DnD.vb...) while the others are projects who all use one or more of the common code files.
If I loaded OrbitalDynamics and, while in it, added a new constant in constants.vb then the next time I loaded the others, they also had the new constant immediately available.
I've rebuilt the common code files for VB2008Exp. I'm now trying to rebuild some of the projects. The problem is that I've not found a way to bring in the common code files. Every time I've tried it's copied them into the project rather than referenced them. Copying is, obviously, useless for the idea of common code.
Hopefully someone out there knows what I've missed, or knows some other method of using common code files in VB2008Exp. I can do this sort of thing in CPP, in C (both in Linux), and in VB6, but so far VB2008Exp has been very intractable.
I need to make some exe file to load my DLL at startup...
What is the easiest way to do it?
I need this exactly, no any injectors or starters.
I though about adding one more code section into exe, rewriting to there entry point logic and placing DLL loading code, then NOPing original entry point and calling my custom made entry point function. Will this work?
Are there any other easer ways?
I also thinking about changing one of system dll name in hex editor to name of my DLL. Will this work? If my dll then load that replaced system dll?
Any thoughts?
Adding it to the PE's import table should be enough. Woodman's lists a few tools which can do it:
http://www.woodmann.com/collaborative/tools/index.php/Category:Import_Editors
I know there are a lot of questions on this topic, and I've looked through a fair number of them. However I am still having problems.
I started writing a test program for a prototype PCB, and now that it's grown to nearly 1000 lines I'm trying to break it up into libraries that I can use for particular functions.
I thought this would be very simple. Make .c and .h files for each library that I need. I.e. I would have OLED.h and OLED.c for functions that control an OLED display. Copy the appropriate functions/definitions into each file. Then copy these files into the solution in Atmel Studio. I put them into the src folder under the project name.
However, this doesn't work! I get an exceedingly long list of errors. All of the things that are defined in the .h file are apparently undefined as far as the compiler is concerned. I also get many error messages of the type "unknown type name int16_t/uint16_t/uint8_t/etc..." That part is really baffling to me. Why should it matter that functions are in an external library, now the compiler doesn't understand what those data types mean?
So, this is probably a stupid problem to have. I don't want Atmel Studio to control my libraries by wrapping them up in some "library project" or somethig, I want to put them in a folder of my choosing and add them when I need them. I've searched for answers to this problem and I find long tutorials about changing the compiler settings for the project, the linker settings, etc... I tried this tutorial and still no dice: http://www.engblaze.com/tutorial-using-avr-studio-5-with-arduino-projects/#setup
I also can't find a way to add something by right clicking the project and clicking "Add." It wants me to find .a files. The "Add Library" dialog box in Atmel Studio is awful, it seems.
Surely it can't be that convoluted to just add a library to an existing project and have it function normally?! I've used PICs in the past and coming to Atmel I've found horrible documentation and a weird super-slick super-fly whizz bang interface that can't leave well enough alone and obfuscates simple function. What can I do to add these libraries?
UPDATE: Seemed to answer my own question. Turns out I needed to include all of the libraries to recognize data types and whatnot into the .c file. I somehow assumed this only had to be done in the main file but obviously I was mistaken. Adding asf.h seems to work well as it includes all of the MCU specific port definitions/names and all of that. All good for now!
Adding library files to a solution should be simple. Go to the Solution Explorer, right-click on your solution, and go to "Add->Existing Item". If you want to add a pre-existing library and keep it in a separate folder from your solution, click the arrow next to "Add" and choose "Add as link". That saves many headaches due to having a duplicate copy of your library in your solution folder, and files not staying up-to-date.
You are right in saying that you need to include the necessary header files in the .c files where they are used.
The compiler compiles each C file separately, and then links them together at the end, so you got the error unknown typename int_* because the compiler had not seen the relevant header in the context of compiling that C file.
You also seem to be in some confusion as to the difference between definition and declaration.
A function is:
Declared in the header file. This means there is a function prototype, e.g. int some_func(char some_var); which tells the compiler that the function exists, but does not tell it what it is. This is necessary because the compiler only looks at one C file at a time, so needs to be told that other functions exist.
Defined in the C file.This is the actual function body, i.e. int some_func(char some_var) { do_stuff(some_var); }. After compilation of each individual C file in isolation, the linker is called to put all the pieces together and give you your final binary, which you flash to the device.
A function can be (and must be) defined only once, but may be declared many times - even in the same file, so long as the declarations are not conflicting.
I hope I worded that right...
Anyway... while writing a VB program I noticed something. In the file explorer under C:\Users\Username\ you see folders like My Documents and My Pictures. When you look at them in command prompt, you see that they are actually called Documents and Pictures. Weird.
Now lets say I want to make a folder, in VB, named My Files, but I want it to point to the actual folder Files. How would I do that?
I can't vouch for this but I've heard you can achieve it through Create A Special Folder In Windows Explorer. I would definitely backup your registry first.
You can make "virtual folders" with Namespace Extensions. It's a pain with .NET. There are components like EZNamespaceExtensions.Net that make the process a little easier.
I know i can use 7z or winrar but i want to learn this for myself.
How would i implement a self extracting archive? I can use C# or C++ but let me run down the problem.
When i open the exe i need some kind of GUI asking where to extract the files. Once the user says ok I should obviously extract them. I implemented a simple example in C# winforms already BUT my problem is HOW do i get the filenames and binary of the files into an exe?
One upon a time i ask Is it safe to add extra data to end of exe? and the answer suggested if i just add data to the end of the exe it may be picked up by a virus scanner. Now its pretty easy to write the length of the archive as the last 4bytes and just append the data to my generic exe and i do believe my process can read my own exe so this could work. But it feels hacky and i rather not have people accuse me of writing virus just because i am using this technique. Whats the proper way to implement this?
Note: I checked the self-extracting tag and many of the question is how to manipulate self extracting and not how to implement. Except this one which is asking something else Self-extracting self-checking executable
-edit- I made two self extracting with 7z and compared them. It looks like... well it IS the 7z.sfx file but with a regular 7z archive appended. So... there is nothing wrong with doing this? Is there a better way? I'm targeting windows and can use the C# compiler to help but i don't know how much extra work or how difficult it may be programmatically and maybe adding data to end of exe isnt bad?
It is possible. I used the following technique once, when we needed to distribute updates for the application, but the computers were configured so that the end user had no permissions to change application files. The update was supposed to log on to administrator account and update required files (so we came across identical problem: how to distribute many files as a single executable).
The solution were file resources in C#. All you need to do is:
Create a resource file in your C# project (file ending with .resx).
Add new resource of type "file". You can easily add existing files as byte[] resources.
In program you can simply extract resource as file:
System.IO.FileStream file = new System.IO.FileStream("C:\\PathToFile",
System.IO.FileMode.OpenOrCreate);
System.IO.BinaryWriter writer = new System.IO.BinaryWriter(file);
writer.Write(UpdateApplication.Data.DataValue, 0, UpdateApplication.Data.DataValue.Length);
(Here UpdateApplication.Data denotes binary resource).
Our solution lacked compression, but I believe this is easily achieved with libraries such as C#ZipLib.
I hope this solution is virus-scanner-safe, as this method creates complete, valid executable file.