Execute a file from main memory.

Question

0.00/5 (No votes)

See more:

I found the system call to run file from disk in java. Its Runtime.getruntime.exec(). Now I need a system call to run a file from main memory.
My File is loaded in
int File[1000]; //This contains my file i.e. sequential array of byes.
int size; //This number contains file size i.e. how many bytes file has.
String filetype; // It contains file type.

Thus I have all file attributes in main memory.
(Remember file is in main memory not on the disk.)
I need to run "File[]" of size "size" and "filetype" informs me which system program to invoke.

Please tell me system call to do this job.

Posted 12-Jul-12 23:05pm

Member 8456001

Add a Solution

Comments

TorstenH. 13-Jul-12 8:07am

sounds really strange. Probably a false approach.
What kind of "file" is that in the RAM? When in doubt - store it as temp file and then call it. that's much safer.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2012-07-13T01:58:00

Solution 1

There isn't one. You could possibly do it via the Win32 LoadLibrary()[^] function, but it's probably more trouble than it's worth.

Posted 13-Jul-12 1:58am

Richard MacCutchan

JackDingler · Answer 2 · 2012-07-13T10:17:00

Solution 2

As others have mentioned, you could save the file to disk, then launch it.

You can't however just start a process from an image in memory.

It would also be unsafe to simply call the entry point of the application, as it's going to expect to own the process space. You'll prob ably find some interesting ways to crash your session this way, as the application allocates resources and remaps your address space to suit it's needs...

Posted 13-Jul-12 10:17am

JackDingler

Comments

Member 8456001 19-Jul-12 15:03pm

Fine...I have an alternate approach which will also work ::
1> I can save the file on disk.
2> Hide that file completely such that user has no access to that file.
3> Run that file by invoking associated system program.
Please note that if you even if know any website / book which will guide me for this then please suggest...

JackDingler 19-Jul-12 16:09pm

Any admin on the machine will be able to access the file. You can't stop that.

As your running from Java, unless you already have elevated permissions, the user will be notified as to the actions you're taking.

I don't know how to save the image to a file in Java, but I can tell you the next step.

You'll run CreateProcess() and pass the file name. The OS will find the associated application for you.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms682425%28v=vs.85%29.aspx