File size is larger after beginwrite

[Chi]

I am a newibe of C# and async programming
thx for your help. I think most likely is my logical problem but i cant
figure it out

using System.IO;
using System.Text;
using System;
class Class1
{
static void Main()
{
Class1 a = new Class1();
a.Run();
Console.ReadLine();

}

void cB(IAsyncResult ar)
{

fsOut.EndWrite(ar);
fsIn.BeginRead(buffer,0,buffer.Length,new AsyncCallback(write),null);
}
void write(IAsyncResult ar)
{
int byteRead=fsIn.EndRead(ar);
if(byteRead==0)
{
fsOut.Write(buffer,0,buffer.Length);
fsOut.Close();
fsIn.Close();
}
else
{
fsOut.BeginWrite(buffer,0,buffer.Length,new AsyncCallback(cB),null);
}

}

public void Run()
{
fsOut = new
FileStream("Result.jpg",FileMode.Create,FileAccess .Write,FileShare.ReadWrite,2048,true);
fsIn= new
FileStream("test.jpg",FileMode.Open,FileAccess.Rea d,FileShare.ReadWrite,2048,true);
fsIn.BeginRead(buffer,0,buffer.Length,new AsyncCallback(write),null);
}
Class1()
{

buffer=new byte[2048];
}
//int LastResult;
private FileStream fsIn;
private FileStream fsOut;
byte [] buffer;


}

[Jon Skeet [C# MVP]]

Chi wrote:

I am a newibe of C# and async programming
thx for your help. I think most likely is my logical problem but i cant
figure it out

Well, it always helps if you describe what the problem is as well as
providing code. However, you certainly *do* have a problem, in that
your call to BeginWrite is assuming that it's managed to read a whole
buffer, instead of writing out bytesRead amount of data.

You're also writing out a full buffer's worth of data even if you
haven't read anything (where you shouldn't be writing anything).

Jon