Editing files by converting to Array.

Question

0.00/5 (No votes)

See more:

I want to convert a file into a byte array so that I can make some edits to it. My program is going to produce a 82 character string, how can I tell my program to open up a file and paste it at, let's say, offset 100?

I have tried the following code:

C#

byte [] data = System.IO.File.ReadAllBytes(filename)

And then:

C#

data[10] = (byte)09;

Now, I'm assuming that this is telling the program to write the byte 09 at offset 10 in the opened file, correct? However, after I do that, there is no 09 @ offset 10 when I look at it in a hex editor. I'm sorry if that's not what it was supposed to do.

I'm trying to open a .pac file. This format may seem unfamiliar to most of you as it is a game file. So, what method could I use that could open any type of file? This is not a text file, I usually edit this using a hex editor.

This is a WinForms application.

I've done a lot of searching, but, because I'm new to coding, I do get confused quite a bit.

Posted 11-Sep-13 0:16am

Miztah Raza

Add a Solution

1 solution

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)

Thomas Barbare · Accepted Answer · 2013-09-11T00:31:00

Solution 1

Quote:
Now, I'm assuming that this is telling the program to write the byte 09 at offset 10 in the opened file, correct?

No you store the content of the file in a byte array but after changing data[10] you don't save it

C#

byte [] data = System.IO.File.ReadAllBytes(filename);

data[10] = (byte)09;

System.IO.File.WriteAllBytes(filename,data);

Posted 11-Sep-13 0:31am

Thomas Barbare

Updated 11-Sep-13 2:19am

v2

Comments

Miztah Raza 11-Sep-13 9:58am

That did it!
Thanks for the help, dude. :)