using System.IO;
using Xceed.Compression;
using Xceed.Compression.Formats;
namespace FileSystemDocumentationExamples.CompressionComponent
{
public class CompressXceedCompressedStreamExample
{
public void MyMainMethod()
{
/* Because Xceed.Compression.Formats is an optional assembly not automatically
unlocked by Xceed Zip for .NET, we must explicitly set our license key to it
before use or else an exception will be thrown. */
Xceed.Compression.Formats.Licenser.LicenseKey = "<your Xceed Zip for .NET license key>";
}
public void Example()
{
/* Setup a destination data stream. This can be any Stream object for any destination as
long as data can be written to it. No 'seek' or 'read' capabilities are needed. */
MemoryStream destinationStream = new MemoryStream();
/* Setup a source data stream. This can be any Stream object from any source as
long as data can be read from it. No 'seek' or 'write' capabilities are needed. */
using( FileStream sourceStream = new FileStream( @"D:\data.txt", FileMode.Open, FileAccess.Read, FileShare.Read ) )
{
/* Optional: the compression method and level can be specified. */
CompressionMethod compressionMethod = CompressionMethod.Deflated;
CompressionLevel compressionLevel = CompressionLevel.Normal;
string password = String.Empty;
// Optional: the data will be encrypted if a non-empty password is specified
//password = "password";
// Create a XceedCompressedStream that wraps around our destination stream
using( XceedCompressedStream xceedCompressedStream = new XceedCompressedStream( destinationStream, compressionMethod, compressionLevel, false, password ) )
{
/* The XceedCompressedStream automatically closes the destination
memory stream. So there is no need to declare the memory stream within a using
statement or to call Close() once we are done with the stream.
If you do not want the inner stream to be closed by the XceedCompressedStream,
set its Transient property to true. */
// Optional: Prevent XceedCompressedStream from closing 'destinationStream' automatically
//xceedCompressedStream.Transient = true;
int bytesRead;
// Setup a 32K buffer
byte[] buffer = new byte[ 32 * 1024 ];
// Read from the source stream until there is no more data
while( ( bytesRead = sourceStream.Read( buffer, 0, buffer.Length ) ) > 0 )
{
// Compress the data by writing into the compressed stream
// Compressed data will be written into its InnerStream, in our case, 'destinationStream'
xceedCompressedStream.Write( buffer, 0, bytesRead );
}
}
}
/* Optional: The MemoryStream's compressed data can be copied to a byte array, you can use
MemoryStream.ToArray(). The method works even when the memory stream has been closed. */
//byte[] compressedData = destinationStream.ToArray();
}
}
}Imports System.IO
Imports Xceed.Compression
Imports Xceed.Compression.Formats
Namespace FileSystemDocumentationExamples.CompressionComponent
Public Class CompressXceedCompressedStreamExample
Public Sub MyMainMethod()
' Because Xceed.Compression.Formats is an optional assembly not automatically
' unlocked by Xceed Zip for .NET, we must explicitly set our license key to it
' before use or else an exception will be thrown.
Xceed.Compression.Formats.Licenser.LicenseKey = "<your Xceed Zip for .NET license key>"
End Sub
Public Sub Example()
' Setup a destination data stream. This can be any Stream object for any destination as
' long as data can be written to it. No 'seek' or 'read' capabilities are needed.
Dim destinationStream As New MemoryStream()
' Setup a source data stream. This can be any Stream object from any source as
' long as data can be read from it. No 'seek' or 'write' capabilities are needed.
Using sourceStream As New FileStream("D:\data.txt", FileMode.Open, FileAccess.Read, FileShare.Read)
' Optional: the compression method and level can be specified.
Dim compressionMethod As CompressionMethod = CompressionMethod.Deflated
Dim compressionLevel As CompressionLevel = CompressionLevel.Normal
Dim password As String = String.Empty
' Optional: the data will be encrypted if a non-empty password is specified
'password = "password";
' Create a XceedCompressedStream that wraps around our destination stream
Using xceedCompressedStream As New XceedCompressedStream(destinationStream, compressionMethod, compressionLevel, False, password)
' The XceedCompressedStream automatically closes the destination
' memory stream. So there is no need to declare the memory stream within a using
' statement or to call Close() once we are done with the stream.
'
' If you do not want the inner stream to be closed by the XceedCompressedStream,
' set its Transient property to true.
' Optional: Prevent XceedCompressedStream from closing 'destinationStream' automatically
'xceedCompressedStream.Transient = true;
Dim bytesRead As Integer
' Setup a 32K buffer
Dim buffer(32 * 1024 - 1) As Byte
' Read from the source stream until there is no more data
bytesRead = sourceStream.Read(buffer, 0, buffer.Length)
Do While bytesRead > 0
' Compress the data by writing into the compressed stream
' Compressed data will be written into its InnerStream, in our case, 'destinationStream'
xceedCompressedStream.Write(buffer, 0, bytesRead)
bytesRead = sourceStream.Read(buffer, 0, buffer.Length)
Loop
End Using
End Using
' Optional: The MemoryStream's compressed data can be copied to a byte array, you can use
' MemoryStream.ToArray(). The method works even when the memory stream has been closed.
'byte[] compressedData = destinationStream.ToArray();
End Sub
End Class
End Namespace