GZipStream Constructor (stream, mode, level)

DotNetZip

Ionic Zip Library v1.9.1.6 GZipStream Constructor (stream, mode, level)

Create a GZipStream using the specified CompressionMode and the specified CompressionLevel.

Declaration Syntax

Visual Basic

Visual C++

public GZipStream(
	Stream stream,
	CompressionMode mode,
	CompressionLevel level
)

Public Sub New ( _
	stream As Stream, _
	mode As CompressionMode, _
	level As CompressionLevel _
)

public:
GZipStream(
	Stream^ stream, 
	CompressionMode mode, 
	CompressionLevel level
)

Parameters

stream (Stream): The stream to be read or written while deflating or inflating.

mode (CompressionMode): Indicates whether the GZipStream will compress or decompress.

level (CompressionLevel): A tuning knob to trade speed for effectiveness.

Remarks

The CompressionMode (Compress or Decompress) also establishes the "direction" of the stream. A GZipStream with CompressionMode.Compress works only through Write(). A GZipStream with CompressionMode.Decompress works only through Read().

Examples

This example shows how to use a GZipStream to compress a file into a .gz file.

CopyC#

using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
{
    using (var raw = System.IO.File.Create(fileToCompress + ".gz"))
    {
        using (Stream compressor = new GZipStream(raw,
                                                  CompressionMode.Compress,
                                                  CompressionLevel.BestCompression))
        {
            byte[] buffer = new byte[WORKING_BUFFER_SIZE];
            int n;
            while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
            {
                compressor.Write(buffer, 0, n);
            }
        }
    }
}

CopyVB.NET

Using input As Stream = File.OpenRead(fileToCompress)
    Using raw As FileStream = File.Create(fileToCompress & ".gz")
        Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression)
            Dim buffer As Byte() = New Byte(4096) {}
            Dim n As Integer = -1
            Do While (n <> 0)
                If (n > 0) Then
                    compressor.Write(buffer, 0, n)
                End If
                n = input.Read(buffer, 0, buffer.Length)
            Loop
        End Using
    End Using
End Using

Assembly: Ionic.Zip (Module: Ionic.Zip) Version: 1.9.1.8 (1.9.1.8)

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