FbwfMemoryConfiguration Class (Standard 8)

7/8/2014

Review the syntax, members, and examples of the FbwfMemoryConfiguration WMI provider class for Windows Embedded 8 Standard (Standard 8).

This class contains information about memory usage and the cache threshold configuration of the File-Based Write Filter (FBWF), and can be used to change memory-related settings.

The following syntax is simplified from Managed Object Format (MOF) code and includes all of the inherited properties.

Syntax

class FbwfMemoryConfiguration
{
  boolean CachePreAllocationEnabled;
  sint64  CacheThreshold;
  boolean CompressionEnabled;
  sint64  DirectoryStructure;
  sint64  FileData;
  sint32  MaxCacheThreshold;
  sint32  MinCacheThreshold;
  boolean NextCachePreAllocationEnabled;
  sint64  NextCacheThreshold;
  boolean NextCompressionEnabled;
  uint32  NextSizeDisplayMode;
  uint32  NotificationThreshold;
  uint32  SizeDisplayMode;
};

Members

This class defines the following types of members:

• Properties

Properties

This class defines the following properties.

Property	Data type	Qualifiers	Description
CachePreAllocationEnabled	Boolean	[Read]	Returns true if cache pre-allocation is active in the current session; otherwise, returns false.
CacheThreshold	sint64	[Read]	Returns the cache threshold for the current session, in bytes.
CompressionEnabled	Boolean	[Read]	Returns true if cache compression is active in the current session; otherwise, returns false.
DirectoryStructure	sint64	[Read]	Returns the memory size, in bytes, used to store the directory structure.
FileData	sint64	[Read]	Returns the memory size, in bytes, used to store the modified files.
MaxCacheThreshold	sint32	[Read]	Returns the maximum cache threshold, in megabytes, as defined by the FBWF header.
MinCacheThreshold	sint32	[Read]	Returns the minimum cache threshold, in megabytes, as defined by the FBWF header.
NextCachePreAllocationEnabled	Boolean	[Read, Write]	Specifies whether cache pre-allocation is active in the next session.
NextCacheThreshold	sint64	[Read, Write]	Specifies the cache threshold for the next session, in bytes.
NextCompressionEnabled	Boolean	[Read, Write]	Specifies whether cache compression is active in the next session.
NextSizeDisplayMode	uint32	[Read, Write]	Specifies the size display mode for the next session. The following table shows the possible values. ValueDescription 0Actual disk size mode 1Virtual disk size mode
NotificationThreshold	uint32	[Read, Write]	Specifies the overlay store utilization notification threshold. The value for this property is a percentage of the cache that is used, beyond which a notification event is raised. The default value for this property is 90.
SizeDisplayMode	uint32	[Read]	Returns the current size display mode. The following table shows the possible values. ValueDescription 0Actual disk size mode 1Virtual disk size mode

Remarks

When querying for property values with a uint64 or sint64 data type in a scripting language such as VBScript, WMI returns string values. Unexpected results can occur when comparing these values, because comparing strings returns different results than comparing numbers. For example, "10000000000" is less than "9" when comparing strings, and 9 is less than 10000000000 when comparing numbers. To avoid confusion you should use the CDbl method in VBScript when properties of type uint64 or sint64 are retrieved from WMI.

Requirements

Architecture	x64, x86
MOF	FBWFProvider.mof
Supported Clients	Windows XP Embedded SP3 Windows Embedded Standard 2009 Windows Embedded Standard 7 SP1 Windows Embedded 8 Standard WEPOS 1.1 SP3 POSReady 2009 Windows Embedded POSReady 7 Windows Fundamentals for Legacy PCs 7
WMI Namespace	root\Microsoft\WriteFilters
WMI Provider	FBWFProvider

See Also

Concepts

File-Based Write Filter WMI Provider Reference