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ICWFGM_Fuel Class Reference

Interface CWFGM Fuel. More...

import "FuelCOM.idl";

Collaboration diagram for ICWFGM_Fuel:
Collaboration graph

Public Member Functions

HRESULT MT_Lock ([in] unsigned short exclusive, [in] unsigned short obtain)
 
HRESULT Clone ([out]ICWFGM_Fuel **newFuel)
 
HRESULT FMC ([in]double latitude, [in]double longitude, [in]double elev, [in]unsigned short day, [out, retval]double *fmc)
 
HRESULT CalculateROSValues ([in]double GS, [in]double SAZ, [in]double WS, [in]double WAZ, [in]double BUI, [in]double FMC, [in]double FFMC, [in]double fF, [in]ULONGLONG time, [in]ULONGLONG ffmc_time, [in] short flag, [out]double *rss, [out]double *roseq, [out]double *ros, [out]double *frss, [out]double *froseq, [out]double *fros, [out]double *brss, [out]double *broseq, [out]double *bros, [out]double *wsv, [out]double *raz)
 
HRESULT CalculateFCValues ([in]double FFMC, [in]double BUI, [in]double FMC, [in]double RSS, [in]double ROS, [in]short flag, [out]double *cfb, [out]double *cfc, [out]double *rso, [out]double *csi, [out]double *sfc, [out]double *tfc, [out]double *fi)
 
HRESULT CalculateStatistics ([in]double ROS, [in]double FROS, [in]double BROS, [in]double CFB, [in]ULONGLONG time, [in]short flag, [out]double *area, [out]double *perimeter)
 
HRESULT CalculateDistances ([in]double ROS, [in]double FROS, [in]double BROS, [in]double CFB, [in]ULONGLONG time, [in]short flag, [out]double *dhead, [out]double *dflank, [out]double *dback)
 
HRESULT ISF ([in]double RSF, [in]double SF, [in]double ISZ, [in]short flag,[out]double *isfValue)
 
HRESULT SFC ([in] double FFMC, [in] double BUI, [in] short flag, [out, retval] double *sfc)
 
HRESULT RSI ([in]double FFMC, [in]double BUI, [in]double FMC, [in]double ISI, [in] short flag, [out, retval]double *rsi)
 
HRESULT IsConiferFuelType ([out, retval] VARIANT_BOOL *retbool)
 
HRESULT IsDeciduousFuelType ([out, retval] VARIANT_BOOL *retbool)
 
HRESULT IsMixedFuelType ([out, retval] VARIANT_BOOL *retbool)
 
HRESULT IsGrassFuelType ([out, retval] VARIANT_BOOL *retbool)
 
HRESULT IsC6FuelType ([out, retval] VARIANT_BOOL *retbool)
 
HRESULT IsMixedDeadFirFuelType ([out, retval]VARIANT_BOOL *retbool)
 
HRESULT IsSlashFuelType ([out, retval]VARIANT_BOOL *retbool)
 
HRESULT IsNonFuel ([out, retval] VARIANT_BOOL *retbool)
 
HRESULT GetDefaultCLSID ([out, retval] CLSID *clsId)
 
HRESULT GetAttribute ([in]unsigned short option, [out, retval]VARIANT *value)
 
HRESULT SetAttribute ([in]unsigned short option, [in]VARIANT value)
 

Properties

BSTR Name [get]
 
VARIANT UserData [get, set]
 

Detailed Description

Interface CWFGM Fuel.

ICWFGM_Fuel interface is a generic interface used by the FireEngine Module (or other tools such as FBPTester) to extract a variety of statistical data about the fuel type given specific conditions.

A given simulation/scenario may use many fuel types, each via the ICWFGM_Fuel COM interface for the purposes of calculating values such as rate-of-spread (ROS). A fuel type may match the published FBP standard, or it may have different, user-defined coefficients for the equations. A fuel type may also represent a fuel that is not defined by the FBP standard (e.g. urban areas).

Applications can also define new fuel types outside the FBP standard that may work with the simulation engine providing they conform to this interface definition and semantics.

Member Function Documentation

ICWFGM_Fuel::CalculateDistances ( [in] double  ROS,
[in] double  FROS,
[in] double  BROS,
[in] double  CFB,
[in] ULONGLONG  time,
[in] short  flag,
[out] double *  dhead,
[out] double *  dflank,
[out] double *  dback 
)

Calculates spread distances of the theoretical ellipse defined by ROS, FROS, BROS.

Parameters
ROSEquilibrium rate of spread (metres per minute).
FROSEquilibrium flank rate of spread (metres per minute).
BROSEquilibrium back rate of spread (metres per minute).
CFBCrown fraction burned.
timeTime since fire start, important if acceleration is turned on.
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h. For consistency of outputs, these flags should match those provided to determine the ROS values.
dheadCalculated value, head fire spread distance.
dflankCalculated value, flank fire spread distance.
dbackCalculated value, back fire spread distance.
ICWFGM_Fuel::CalculateFCValues ( [in] double  FFMC,
[in] double  BUI,
[in] double  FMC,
[in] double  RSS,
[in] double  ROS,
[in] short  flag,
[out] double *  cfb,
[out] double *  cfc,
[out] double *  rso,
[out] double *  csi,
[out] double *  sfc,
[out] double *  tfc,
[out] double *  fi 
)

Given several input parameters, calculates FC (fuel consumption) values. The specific set of equations used to calculate FC values is determined by the fuel type and/or any modifications which have been applied. Automatic caching of previously calculated values is performed for efficiency.

Parameters
FFMCFine fuel moister code (FWI output)
BUIBuildup index (FWI output)
FMCFoliar moisture code (FBP output) (0-1)
RSS(metres per minute)
ROSRate of spread (metres per minute)
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h For consistency of outputs, these flags should match those provided to determine the ROS values.
cfbCalculated value, crown fraction burned (unitless).
cfcCalculated value, crown fuel consumption (kg/m2).
rsoCalculated value, critical spread rate for crowning
csiCalculated value, critical surface intensity for crowning
sfcCalculated value, surface fuel consumption (kg/m2).
tfcCalculated value, total fuel consumption (kg/m2).
fiCalculated value, fire intensity
ICWFGM_Fuel::CalculateROSValues ( [in] double  GS,
[in] double  SAZ,
[in] double  WS,
[in] double  WAZ,
[in] double  BUI,
[in] double  FMC,
[in] double  FFMC,
[in] double  fF,
[in] ULONGLONG  t,
[in] ULONGLONG  ffmc_t,
[in] short  flag,
[out] double *  rss,
[out] double *  roseq,
[out] double *  ros,
[out] double *  frss,
[out] double *  froseq,
[out] double *  fros,
[out] double *  brss,
[out] double *  broseq,
[out] double *  bros,
[out] double *  wsv,
[out] double *  raz 
)

Given several input parameters, calculates various of rate of spread (ROS) values. The specific set of equations used to calculate ROS values is determined by the fuel type and/or any modifications which have been applied. Automatic caching of previously calculated values is performed for efficiency.

Parameters
GSPercentage ground slope specified as a decimal value (0 - 1)
SAZSlope azimuth, upslope (radians, Cartesian)
WSObserved wind speed (kph)
WAZWind azimuth (radians, Cartesian)
BUIBuildup index (FWI output)
FMCFoliar moisture code (FBP output) (0-1)
FFMCFine fuel moister code (FWI output)
fFFine fuel moisture function in the ISI (FWI output)
tTime in seconds since ignition, used for purposes of calculating acceleration
ffmc_tTime in seconds for the duration used to calculate FFMC
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h
rssCalculated value, RSS (metres per minute)
roseqCalculated value, ROSeq (equilibrium rate of spread) (metres per minute)
rosCalculated value, ROS (rate of spread) (metres per minute)
frssCalculated value, FRSS (flank RSS) (metres per minute)
froseqCalculated value, FROSeq (flank equilibrium rate of spread) (metres per minute)
frosCalculated value, FROS (flank rate of spread) (metres per minute)
brssCalculated value, BRSS (back RSS) (metres per minute)
broseqCalculated value, BROSeq (back equilibrium rate of spread) (metres per minute)
brosCalculated value, BROS (back rate of spread) (metres per minute)
wsvCalculated value, WSV (wind speed vector) (metres per minute)
razCalculated value, RAZ (wind speed vector azimuth) (radians, Cartesian)
ICWFGM_Fuel::CalculateStatistics ( [in] double  ROS,
[in] double  FROS,
[in] double  BROS,
[in] double  CFB,
[in] ULONGLONG  time,
[in] short  flag,
[out] double *  area,
[out] double *  perimeter 
)

Calculates statistics of the theoretical ellipse defined by ROS, FROS, BROS. To match the CFS code, these values should be equilibrium values. To match Prometheus implementations, these should values should be instantaneous, after corrections through any ellipse equations.

Parameters
ROSRate of spread (metres per minute).
FROSFlank rate of spread (metres per minute).
BROSBack rate of spread (metres per minute).
CFBCrown fraction burned.
timeTime since fire start, important if acceleration is turned on.
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h. For consistency of outputs, these flags should match those provided to determine the ROS values.
areaCalculated value, fire area.
perimeterCalculated value, fire perimeter.
ICWFGM_Fuel::Clone ( [out] ICWFGM_Fuel **  newFuel)

Creates a new fuel object with properties which are identical to that of the object being called, returns a handle to the new object in newFuel.

Parameters
newFuelAddress of memory to contain the reference for a newly created fuel object
ICWFGM_Fuel::FMC ( [in] double  latitude,
[in] double  longitude,
[in] double  elev,
[in] unsigned short  day,
[out, retval] double *  fmc 
)

Calculates the FMC (foliar moisture content) value based on several parameters. If elevation is negative, then the normalized latitude is calculated based on equation 1 of "Development and the Structure of the Canadian Forest Fire Behaviour Prediction System -Information Report ST-X-3", otherwise it is calculated from equation 3. Similarly, minimum FMC is calculated using either equation 2 or 4. If the latitude and longitude are outside the general extents of Canada (latitude: 42 to 83 degrees, longitude: -52 to -141 degrees), then the latitude and/or longitude are modified to be within these ranges.

Parameters
latitudeSpecific location (latitude, radians, signed) on the earth's surface.
longitudeSpecific location (longitude, radians, signed) on the earth's surface.
elevElevation of the specific location (metres) from sea level.
dayJulian day (day of the year, 0-365)
fmcThe calculated FMC value (percentage value expressed as a decimal 0-1)
ICWFGM_Fuel::GetAttribute ( [in] unsigned short  option,
[out, retval] VARIANT *  value 
)

Polymorphic. Gets a particular attribute for a fuel. Each fuel type comprises of a variety of equations and values. This function allows the client application to retrieve most any value that would define some aspect of the calculations for this fuel type.

Parameters
optionThis parameter identifies which attribute value to retrieve.
valueThe value of the attribute being requested.
ICWFGM_Fuel::GetDefaultCLSID ( [out, retval] CLSID *  clsID)

Returns the default CLSID for this fuel type. A CLSID is the identifier for the class of a COM object. For read-only fuel types, this value is set to the same class as itself. I.e., it's default fuel type is itself. For read/write fuel types which were cloned from another fuel type, this value is set to the class of the original default fuel type used to create it. I.e., if a C-1 fuel type was cloned into a read/write fuel type, this value would be the CLSID for the C-1 read-only fuel type. This value is unused by this COM DLL and may be removed in future releases. Its purpose is to facilitate the client application ability to reset a fuel type back to its default values.

Parameters
clsIDreturn value for CLSID
ICWFGM_Fuel::IsC6FuelType ( [out, retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is C-6. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::IsConiferFuelType ( [out, retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is C-1, C-2, C-3, C-4, C-5, C-6, or C-7. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::IsDeciduousFuelType ( [out, retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is D-1 or D-2. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::ISF ( [in] double  RSF,
[in] double  SF,
[in] double  ISZ,
[in] short  flag,
[out] double *  isfValue 
)

Calculates the value for ISF based on parameters passed in. Note that this method is used by mixed fuel types only and likely should not be called directly. Automatic caching of previously calculated values is performed for efficiency.

Parameters
RSFIntermediate output for calculating ROS values.
SFSlope factor.
ISZDead wind ISI.
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h.
isfValuethe calculated ISF value
ICWFGM_Fuel::IsGrassFuelType ( [out, retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is O-1a or O-1b. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::IsMixedDeadFirFuelType ( [out,retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is M-3 or M-4. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::IsMixedFuelType ( [out, retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is M-1 or M-2. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::IsNonFuel ( [out,retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is a non-fuel. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::IsSlashFuelType ( [out,retval] VARIANT_BOOL *  retbool)

Reports whether the fuel type is S-1, S-2, or S-3. This fuel type information is retained after cloning a read-only template into a read/write fuel type. This information will become invalid once an equation in the read/write fuel has been replaced.

Parameters
retboolresult of the test
ICWFGM_Fuel::MT_Lock ( [in] unsigned short  exclusive,
[in] unsigned short  obtain 
)

Changes the state of the object with respect to access rights. When the object is used by an active simulation, it must not be modified. When the object is somehow modified, it must be done so in an atomic action to prevent concerns with arising from multithreading. Note that these locks are only needed for calls to this object via this interface. Method calls from the other interface are already multithreading friendly.

Parameters
exclusiveTRUE if the requester wants a write lock, false for read/shared access
obtainTRUE to obtain the lock, FALSE to release the lock. If this is FALSE, then the exclusive parameter must match the initial call used to obtain the lock.
ICWFGM_Fuel::RSI ( [in] double  FFMC,
[in] double  BUI,
[in] double  FMC,
[in] double  ISI,
[in] short  flag,
[out,retval] double *  rsi 
)

Calculates RSI (initial rate of spread) without BUI effect. Note that this routine may seem redundant to CalculateROSValues() but is used by mixed fuel types. Typically CalculateROSValues) should be called. Automatic caching of previously calculated values is performed for efficiency.

Parameters
FFMCFine fuel moister code (FWI output)
BUIBuildup index (FWI output)
FMCFoliar moisture code (FBP output) (0-1)
ISIInitial spread index (FWI output). Note that the FBP version of the ISI calculation (in the FWI module) should be used.
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h. For consistency of outputs, these flags should match those provided to determine the ROS value.
rsiReturned calculated RSI
ICWFGM_Fuel::SetAttribute ( [in] unsigned short  option,
[in] VARIANT  value 
)

Sets a particular attribute for a fuel. This method can be used to modify some generic value associated with the fuel, or most any coefficient of specific equations used to calculated values for the fuel.

Parameters
optionThis parameter identifies which attribute value to retrieve.
valueThe value of the attribute being requested.
ICWFGM_Fuel::SFC ( [in] double  FFMC,
[in] double  BUI,
[in] short  flag,
[out,retval] double *  sfc 
)

Calculates the SFC (surface fuel consumption) value based on several parameters. Note that this routine may seem redundant to CalculateFCValues() but is used by mixed fuel types. Typically, the CalculateFCValues() method should be called. Automatic caching of previously calculated values is performed for efficiency.

Parameters
FFMCFine fuel moister code (FWI output)
BUIBuildup index (FWI output)
flagA combination of
  • CWFGM_SCENARIO_OPTION_ACCEL Boolean. If TRUE, then acceleration is applied to various output statistics in the FBP standard. This value should only applicable to point ignitions. If FALSE, then the fire is assumed to be always at equilibrium.
  • CWFGM_SCENARIO_OPTION_BUI Boolean. If TRUE, then the BUI build-up effect is applied to various statistics in the FBP standard.
  • CWFGM_SCENARIO_OPTION_TOPOGRAPHY Boolean. If TRUE, then the slope component to calculating the WSV output statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided. This setting also affects the slope component in Dr. Richards' 3D equations.
  • CWFGM_SCENARIO_OPTION_GREENUP Boolean. Specific FBP fuel types use different equations during green-up. This flag determines whether to use green-up equations or not.
  • CWFGM_SCENARIO_OPTION_WIND Boolean. If FALSE, then the wind component to calculating the WSV statistic in the FBP standard is set to 0.0. If TRUE, then the wind speed is used as provided.
bit flags, defined in FireEngine_Ext.h
sfcthe calculated SFC value

Property Documentation

Property ICWFGM_Fuel::Name
getproperty

Return the name of the fuel type

Parameters
pValName of the fuel type
Property ICWFGM_Fuel::UserData
getsetproperty

This property is unused by this object, and is available for exclusive use by the client code. It is a VARIANT value to ensure that the client code can store a pointer value (if it chooses) for use in manual subclassing this object. This value is not loaded or saved during serialization operations, and it is the responsibility of the client code to manage any value or object stored here. Access to this property is not thread-safe.

Parameters
pValwhen retrieving the property
newValwhen setting the property