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Imports System
Imports System.IO
Imports System.Text
Public Class MainClass
Dim Shared inputStream As Stream = New FileStream("test.txt",FileMode.Open,FileAccess.Read, _
FileShare.ReadWrite,1024, True)
Dim Shared myCallBack As AsyncCallback
Dim Shared BufferSize As Integer = 256
Dim Shared buffer( ) As Byte = New Byte(BufferSize) {}
Shared Sub Main( )
myCallBack = AddressOf OnCompletedRead
inputStream.BeginRead(buffer,0,buffer.Length,myCallBack, Nothing)
Dim i As Long
For i = 0 To 499999
If i Mod 1000 = 0 Then
Console.WriteLine("i: {0}", i)
End If
Next i
End Sub
Shared Sub OnCompletedRead(ByVal asyncResult As IAsyncResult)
Dim bytesRead As Integer = inputStream.EndRead(asyncResult)
If bytesRead > 0 Then
Dim s As String = _
Encoding.ASCII.GetString(buffer, 0, bytesRead)
Console.WriteLine("OnComplete" & s)
inputStream.BeginRead( _
buffer, 0, buffer.Length, myCallBack, Nothing)
End If
End Sub
End Class
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