Solved

Read File by blocks

Posted on 2011-02-20
7
630 Views
Last Modified: 2012-05-11
I want to read files by blocks.

I want to use it to compare files. This is to build a little Incremental Backup. I have to read the files by blocks.
Compare the values..

Or can anyone give me an example how to do it? Provide me with a better solution if it is possible.
0
Comment
Question by:databoks
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 34939627
The standard FileStream allows you to read by blocks.  Just open it up, move the pointer with Seek(), then use Read().

In its simplest form:
Byte[] buffer = new Byte[4096];
            FileStream fs = new FileStream(@"c:\some\path to\a_file.ext", FileMode.Open);
            fs.Seek(someOffsetInBytes, SeekOrigin.Begin);
            fs.Read(buffer, 0, buffer.Length);
            fs.Close();

Open in new window

0
 
LVL 29

Expert Comment

by:nffvrxqgrcfqvvc
ID: 34939957
<< I want to use it to compare files.  >>

You may want to also look into hashing if you intend to compare files
0
 
LVL 8

Author Comment

by:databoks
ID: 34941868
Please give an example ny using gule streams
0
PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 34943631
"gule streams"?...can you explain further?
0
 
LVL 16

Expert Comment

by:DansDadUK
ID: 34943675
'gule' - perhaps a typo for 'file'? (F-G and U-I being adjacent)
0
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 34943721
Hehe...good spot DansDanUK.  =)

Are you asking about comparing two files in blocks now?
...or how to do the Hashing as egl1044 suggests?

Do you need to know WHERE the two files differ?  (read by blocks)
...or just that they are different? (hashing is better)
0
 
LVL 8

Author Comment

by:databoks
ID: 34943742
Sorry - i meant using the FileStream Class., but i can see the example is there.

I have read this through my mobile but couldn't see the code example.
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

729 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question