CompressionMethod Property (ZippedFile)

Gets the CompressionMethod that was used to compress the file.

Syntax

Visual Basic
C#

'Declaration
 
Public Overridable Property CompressionMethod As CompressionMethod

'Usage
 
Dim instance As ZippedFile

Dim value As CompressionMethod

 

instance.CompressionMethod = value

 

value = instance.CompressionMethod

public virtual CompressionMethod CompressionMethod {get; set;}

Property Value

A value indicating the CompressionMethod that was used to compress the file.

Remarks

The PPMd algorithm uses a custom memory management system called SubAllocator. In a zip file, the memory size the SubAllocator uses is defined in the WinZip PPMd header for the compressed file and this header's value is used when decompressing the data. In general, WinZip uses 64Mb. Since the algorithm used was not optimized from the original PPMd version I revision 1, the SubAllocator initially requires the total amount of memory specified in the PPMd compressor. This means you must have at least 64 free Mb of RAM when using this compression method.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

ZippedFile Class
ZippedFile Members