Attribute that gets its value from an EPICS PV. More...

#include <PVAttribute.h>

Inheritance diagram for PVAttribute:

Public Member Functions
	PVAttribute (const char pName, const char pDescription, const char *pSource, chtype dbrType)
	Constructor for an EPICS PV attribute. More...

	PVAttribute (PVAttribute &attribute)
	Copy constructor for an EPICS PV attribute. More...

	~PVAttribute ()

PVAttribute *	copy (NDAttribute *pAttribute)
	Copies properties from this to pOut. More...

virtual int	updateValue ()
	Updates the current value of this attribute. More...

void	connectCallback (struct connection_handler_args cha)
	Connection callback called whenever an EPICS PV connects or disconnects. More...

void	monitorCallback (struct event_handler_args cha)
	Monitor callback called whenever an EPICS PV changes value. More...

int	report (FILE *fp, int details)
	Reports on the properties of the PVAttribute object; calls base class NDAttribute::report() to report on the parameter value. More...

Public Member Functions inherited from NDAttribute
	NDAttribute (const char pName, const char pDescription, NDAttrSource_t sourceType, const char pSource, NDAttrDataType_t dataType, void pValue)
	NDAttribute constructor. More...

	NDAttribute (NDAttribute &attribute)
	NDAttribute copy constructor. More...

virtual	~NDAttribute ()
	NDAttribute destructor. More...

virtual const char *	getName ()
	Returns the name of this attribute. More...

virtual const char *	getDescription ()
	Returns the description of this attribute. More...

virtual const char *	getSource ()
	Returns the source string of this attribute. More...

virtual const char *	getSourceInfo (NDAttrSource_t *pSourceType)
	Returns the source information of this attribute. More...

virtual NDAttrDataType_t	getDataType ()
	Returns the data type of this attribute. More...

virtual int	getValueInfo (NDAttrDataType_t pDataType, size_t pDataSize)
	Returns the data type and size of this attribute. More...

virtual int	getValue (NDAttrDataType_t dataType, void *pValue, size_t dataSize=0)
	Returns the value of this attribute. More...

virtual int	getValue (std::string &value)
	Returns the value of an NDAttrString attribute as an std::string. More...

virtual int	setDataType (NDAttrDataType_t dataType)
	Sets the data type of this attribute. More...

virtual int	setValue (const void *pValue)
	Sets the value for this attribute. More...

virtual int	setValue (const std::string &)
	Sets the value for this attribute. More...

Additional Inherited Members
Static Public Member Functions inherited from NDAttribute
static const char *	attrSourceString (NDAttrSource_t type)

Detailed Description

Attribute that gets its value from an EPICS PV.

Constructor & Destructor Documentation

PVAttribute::PVAttribute	(	const char *	pName,
		const char *	pDescription,
		const char *	pSource,
		chtype	dbrType
	)

Constructor for an EPICS PV attribute.

Parameters

[in]	pName	The name of the attribute to be created; case-insensitive.
[in]	pDescription	The description of the attribute.
[in]	pSource	The name of the EPICS PV to be used to obtain the attribute value.
[in]	dbrType	The EPICS DBR_XXX type to be used (DBR_STRING, DBR_DOUBLE, etc). In addition to the normal DBR types a special type, DBR_NATIVE, may be used, which means to use the native data type returned by Channel Access for this PV.

PVAttribute::PVAttribute ( PVAttribute & attribute )

Copy constructor for an EPICS PV attribute.

Parameters

[in] attribute The PVAttribute to copy from. NOTE: The copy is not "functional", i.e. it does not update when the PV changes, the value is frozen.

PVAttribute::~PVAttribute ( )

Member Function Documentation

void PVAttribute::connectCallback ( struct connection_handler_args cha )

Connection callback called whenever an EPICS PV connects or disconnects.

If it is a connection event it calls ca_add_masked_array_event to request callbacks whenever the value changes.

Parameters

[in] cha Connection handler argument structure passed by channel access.

PVAttribute * PVAttribute::copy ( NDAttribute * pOut )

virtual

Copies properties from this to pOut.

Parameters

[in] pOut A pointer to the output attribute If NULL the output attribute will be created using the copy constructor Only the value is copied, all other fields are assumed to already be the same in pOut

Returns: Returns a pointer to the copy

Reimplemented from NDAttribute.

void PVAttribute::monitorCallback ( struct event_handler_args eha )

Monitor callback called whenever an EPICS PV changes value.

Calls NDAttribute::setValue to store the new value.

Parameters

[in] eha Event handler argument structure passed by channel access.

int PVAttribute::report	(	FILE *	fp,
		int	details
	)

virtual

Reports on the properties of the PVAttribute object; calls base class NDAttribute::report() to report on the parameter value.

Parameters

[in]	fp	File pointer for the report output.
[in]	details	Level of report details desired; currently does nothing in this derived class.

Reimplemented from NDAttribute.

int PVAttribute::updateValue ( )

virtual

Updates the current value of this attribute.

The base class does nothing, but derived classes may fetch the current value of the attribute, for example from an EPICS PV or driver parameter library.

Reimplemented from NDAttribute.

The documentation for this class was generated from the following files:

/home/epics/devel/areaDetector/ADCore/ADApp/ADSrc/PVAttribute.h
/home/epics/devel/areaDetector/ADCore/ADApp/ADSrc/PVAttribute.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation