Question

FileStream out of bounds or count to large

Asked by: silentthread2k

Hi,

I need to be able to read a file from a certain starting points. Example... Start at byte offset 2, and then read 400 bytes after that. My code below works fine when I start from offset zero, but if I try anything else like start at offset 2 and read 400 bytes, it throws and exception of out of bounds or count to big.

int ncount = 400;
 
            FileStream fs = File.OpenRead(mfilepath); // opening a file stream object
 
            byte[] data = new byte[ncount]; //creating a byte array with the ncount size
 
	    fs.Read(data, 0, 400); //this works
 
            // this one does not work....  fs.Read(data, 2, 400);

                                  
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Asked On
2009-04-07 at 09:13:29ID24302572
Tags

C#

,

FileStream

,

Read

Topics

C# Programming Language

,

Microsoft Visual C#.Net

Participating Experts
3
Points
500
Comments
3

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Answers

 

by: SaedSalmanPosted on 2009-04-07 at 09:21:51ID: 24088993

the offset does not mean from where to start reading:

offset
Type: System..::.Int32
The byte offset in array at which the read bytes will be placed.

you will not be able to put 400 bytes in the thired index(offset=2, zero based) of the a byte array. the thired index will holds as long as ONE byte only.

 

by: b_levittPosted on 2009-04-07 at 11:15:03ID: 24090217

Yes, Saed has identified the problem.

I beleive the FileStream supports seeking.  If so, the solution is...
fs.Seek(2, SeekOrigin.Begin)
...before you call
fs.Read(data, 0, 400);

 

by: gregoryyoungPosted on 2009-04-07 at 11:21:29ID: 24090279

What you want is stream.Seek(2); then do your normal read.

20120131-EE-VQP-002

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