How to create new file with fixed size

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nano2k - 31 Aug 2007 10:59 GMT

Hi

For some purposes, I need to create a new binary file and to allocate
a fixed length for that file on the disk.
I need something like File.Create(string fileName, long
initialSizeInBytes).
Is there a framework/system method to do that or should I create the
file and then fill it until the size is reached?

Thanks

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marss - 31 Aug 2007 11:09 GMT

> Hi
>
[quoted text clipped - 6 lines]
>
> Thanks

System.IO.File.WriteAllBytes("file.txt", new byte[100]);

Regards,
Mykola
http://marss.co.ua

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nano2k - 31 Aug 2007 11:54 GMT

> > Hi
>
[quoted text clipped - 11 lines]
> Regards,
> Mykolahttp://marss.co.ua

Hi Mykola
Thanks for your response.
I'm using .NET Framework 1.1, so this method you suggested is not
available in my case.
The files I will create are far larger than you suggested in your
post. May be hundreds of megs, or even few gigs.
What you suggest is that I should create a file, than write the amount
of bytes I need. Writing in one shot is not ok. It's not my desire to
allocate a huge buffer just to tranfer it to a file.
I'd rather write to file successively a reasonable sized buffer until
the desired size is reached.
This is my approach at the moment, but I thought that there should be
a another, more optimum, way to do it.

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Michael Nemtsev, MVP - 31 Aug 2007 13:25 GMT

Hello nano2k,

use this one
using (FileStream stream = new FileStream(path, FileMode.Create, FileAccess.Write,
FileShare.Read))
{
stream.Write(bytes, 0, bytes.Length);
}

u can do in blocks, writing to file several times

---
WBR,
Michael Nemtsev [.NET/C# MVP] :: blog: http://spaces.live.com/laflour

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

n> On 31 Aug, 13:09, marss <marss...@gmail.com> wrote:
n>

>>> Hi
>>>
[quoted text clipped - 11 lines]
>> Regards,
>> Mykolahttp://marss.co.ua

n> Hi Mykola
n> Thanks for your response.
n> I'm using .NET Framework 1.1, so this method you suggested is not
n> available in my case.
n> The files I will create are far larger than you suggested in your
n> post. May be hundreds of megs, or even few gigs.
n> What you suggest is that I should create a file, than write the
n> amount
n> of bytes I need. Writing in one shot is not ok. It's not my desire to
n> allocate a huge buffer just to tranfer it to a file.
n> I'd rather write to file successively a reasonable sized buffer until
n> the desired size is reached.
n> This is my approach at the moment, but I thought that there should be
n> a another, more optimum, way to do it

Reply to this Message

Austin Ehlers - 31 Aug 2007 15:57 GMT

>Hi
>
[quoted text clipped - 6 lines]
>
>Thanks

FileStream fs=new FileStream("???", FileMode.Create);
long len=....
fs.SetLength(len);

Note that the contents of the file are *not* guranteed to be 0.

Austin

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How to create new file with fixed size

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