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| 11/06/2009 at 07:51AM PST, ID: 24878209 |
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The Solution Rating System
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Public Function DownloadChunk(ByVal FileName As String, ByVal Offset As Long _
, ByVal BufferSize As Integer) As Byte()
Dim TmpBuffer As Byte()
Dim BytesRead As Integer
Try
Using fs As New FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read)
fs.Seek(Offset, SeekOrigin.Begin)
' this is relevent during a retry. otherwise, it just seeks to the start
TmpBuffer = New Byte(BufferSize - 1) {}
' read the first chunk in the buffer (which is re-used for every chunk)
BytesRead = fs.Read(TmpBuffer, 0, BufferSize)
End Using
If BytesRead <> BufferSize Then
' the last chunk will almost certainly not fill the buffer, so it must be trimmed before returning
Dim TrimmedBuffer As Byte() = New Byte(BytesRead - 1) {}
Array.Copy(TmpBuffer, TrimmedBuffer, BytesRead)
Return TrimmedBuffer
Else
Return TmpBuffer
End If
Catch exRead As Exception
CustomSoapException("Error reading file", exRead.Message)
Return Nothing
End Try
End Function
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