How can I compress the c programme according to my requirements. My written chatting server and client programme exe are 390K and 363K. I need to compress this as much as I can. After that it should work.
How can I do this?

thanks

What are your requirements?

In any case, it is very easy to give a definite answer to your question.

The answer is: It Depends!

What compiler and operating system are you using? (If more than one compiler is available, sometimes the variation in executable file sizes is huge.)

1. Sometimes the source code can be tweaked to obtain more efficient in use of memory at run-time. Note that the size of the executable file does not tell the whole story about how much memory is actually used by the program when it executes. Which do you want to reduce? In other words, what are your requirements? (But I asked that already, didn't I?)

2. In my experience, compiler switches for optimization may be much more important than trying to tweak source code. (Well, not always, but it's pretty hard to give a lot of general rules for minimizing executable file size. That's why I gave the answer that I did.)

Also, whether you are compiling with debugging information in the file.

Also for Linux/UNIX operating systems, a utility named strip can get rid of certain things in the executable that aren't strictly necessary for execution.

Also...

Regards,

Dave

I've used UPX to squish the stuffing out of exe's. It's available in a variety of flavors.

Mark

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I am trying to code Trojan in c for my project in Msc. I need to compress it for much a s possible that it would act as a real Trojan. Now it is coded as chat server and client but I am further develop it as to send email to certain mail address with the required files as attachments from inflected computer after it inflected. Compiled Chatting exe without mailing function size I ve given. But if I ve add mail sending codes it will again become bigger
to 589k.

I am using dev c++ complier. I ve tried with MVC but its giving bigger file.
In dev c++ how can I reduce the file ? and how can I remove debugging information attach to the exe file?. What are the possible ways to reduce exe more, like previous method. what will be the other information that I can reduce?

Pls tell me if I use dll (dynamic link libraries) then is it possible to reduce the file.
If it is, how can I use the dll?

Pls help me for my work.

Thanks for your comments...

What is this all about?
Are you actually trying to code a Trojan and expect us to help you do it? Is your intention to actually infect computers and have them unknowingly send emails for you? Because if it is, you will find no help here!

Please provide more information as to what your intentions are.

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Really I am studying for a Msc in Policy Oriented Information Security Systems. I have tried to work for my subject.

If you feel that the thread is not suitable for discuss you can avoid this as well as I also giveup and findout any other way to get the nuts and bolts of this.

Thanks so much and I am appologise if I break the rules of the forums.