what does abc.dat contain?
if it is abcdefghijklmnopqrstuvwxyz
then your output will be:
zyxwvutsrqponmlkjihg
this is because your seek origin is at the end, and as usman
explained, reading forward from this point will bring back char
65535. Once you hit i = 0 it will return the end character, then -1
will read the second to last, -2 the third to last etc.
if you want to read from t backwards, the following loop should do it:
for(int i=20; i>=0; i--)
{
f.Seek(i, SeekOrigin.Beginning); // this may be start
- check the enum
ch= (char)f.ReadByte();
Console.Write(ch+" ");
}
VIKAS GARG View profileusing System; using System.IO; class Program
{ static void Main(string[] args) { FileStream
f; char ch; try { f = new
FileStream("abc.dat", FileMode.Create); } catch
(IOException exc)
{ Console.WriteLine(exc.Message);
return; } for (int i = 0; i < 26; i++)
{ try { f.WriteByte((byte)('A'
+ i)); } catch (IOException exc)
{ Console.WriteLine(exc.Message);
return; } } try
{ Console.WriteLine(); Console.WriteLine("Here
is every other value"); for(int i=20; i>-20; i-
=1) { f.Seek(i,
SeekOrigin.End); ch=
(char)f.ReadByte(); Console.Write(ch+"
"); } } catch(IOException exc)
{ Console.WriteLine(exc.Message);
return; } f.Close(); } } How is this block working
in the above program Here the concept of SeekOrigin.End is bit
confusing for(int i=20; i>-20; i-=1)
{ f.Seek(i, SeekOrigin.End); ch=
(char)f.ReadByte(); Console.Write(ch+"
"); }
More options 5 Nov, 11:30
From: "VIKAS GARG" <[EMAIL PROTECTED]>
Date: Wed, 5 Nov 2008 17:00:23 +0530
Local: Wed 5 Nov 2008 11:30
Subject: Seek End
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using System;
using System.IO;
class Program
{
static void Main(string[] args)
{
FileStream f;
char ch;
try
{
f = new FileStream("abc.dat", FileMode.Create);
}
catch (IOException exc)
{
Console.WriteLine(exc.Message);
return;
}
for (int i = 0; i < 26; i++)
{
try
{
f.WriteByte((byte)('A' + i));
}
catch (IOException exc)
{
Console.WriteLine(exc.Message);
return;
}
}
try
{
Console.WriteLine();
Console.WriteLine("Here is every other value");
for(int i=20; i>-20; i-=1)
{
f.Seek(i, SeekOrigin.End);
ch= (char)f.ReadByte();
Console.Write(ch+" ");
}
}
catch(IOException exc)
{
Console.WriteLine(exc.Message);
return;
}
f.Close();
}
}
How is this block working in the above program
Here the concept of SeekOrigin.End is bit confusing
On 6 Nov, 06:32, "VIKAS GARG" <[EMAIL PROTECTED]> wrote:
> In my proggThere are two for loops
> Using the first for loop, I had took or copies the output in a file
> "abc.dat"
> then using second for loop I had took the output on the console.
>
> Concentrate on my second for loop
> that is
> for(int i=20; i>-20; i-=1)
> And I am trying to seek from the last value. Not when i is 20, the origin is
> 20th alphabet, that is "T" means my progg should consider "T" as the last
> alphabet. and moves backward by one position. Next output should be "S".
> This is all what I think.
> I know output is not coming according to my expectation. This means I am
> wrong somewhere in my concepts
> Please Usman tell me where am I wrong
