JSON print/parse

Classes
struct	epics::pvData::JSONPrintOptions
	Options used during printing. More...

Functions
void	epics::pvData::printJSON (std::ostream &strm, const PVStructure &val, const BitSet &mask, const JSONPrintOptions &opts=JSONPrintOptions())
void	epics::pvData::printJSON (std::ostream &strm, const PVField &val, const JSONPrintOptions &opts=JSONPrintOptions())
void	epics::pvData::printJSON (std::ostream &strm, const PVField::const_shared_pointer &val, const JSONPrintOptions &opts=JSONPrintOptions())
PVStructure::shared_pointer	epics::pvData::parseJSON (std::istream &strm)
void	epics::pvData::parseJSON (std::istream &strm, PVField &dest, BitSet *assigned=0)
void	epics::pvData::parseJSON (std::istream &strm, const PVField::shared_pointer &dest, BitSet *assigned=0)
bool	epics::pvData::yajl_parse_helper (std::istream &src, yajl_handle handle)

Detailed Description

Printing PVField as JSON and parsing JSON into PVField.

Function Documentation

PVStructure::shared_pointer epics::pvData::parseJSON

(

std::istream &

strm

)

Parse JSON text into a PVStructure

Restrictions:

• Top level must be {} dict/object
• field values must be number, string, array, or dict/object
• array values must be number or string

void epics::pvData::parseJSON	(	std::istream &	strm,
		PVField &	dest,
		BitSet *	assigned = 0
	)

Parse JSON and store into the provided PVStructure.

Restrictions:

• array of union not supported
• Only scalar value assigned to union

Parameters

strm	Read JSON text from stream
dest	Store in fields of this structure
assigned	Which fields of dest were assigned. (Optional)

Exceptions

std::runtime_error

on failure. dest and assigned may be modified.

Version

Overload added after 7.0.0

void epics::pvData::printJSON	(	std::ostream &	strm,
		const PVStructure &	val,
		const BitSet &	mask,
		const JSONPrintOptions &	opts = JSONPrintOptions()
	)

Print PVStructure as JSON

'mask' selects those fields which will be printed.

Version

Overload added after 7.0.0

void epics::pvData::printJSON	(	std::ostream &	strm,
		const PVField &	val,
		const JSONPrintOptions &	opts = JSONPrintOptions()
	)

Print PVField as JSON

Version

Overload added after 7.0.0

bool epics::pvData::yajl_parse_helper	(	std::istream &	src,
		yajl_handle	handle
	)

Wrapper around yajl_parse()

Parse entire input stream. Errors if extranious non-whitespace found after the point were parsing completes.

Parameters

src	The stream from which input charactors are read
handle	A parser handle previously allocated with yajl_alloc(). Not free'd on success or failure.

Returns

true if parsing completes successfully. false if parsing cancelled by callback. throws other errors

Note

The form of this call depends on EPICS_YAJL_VERSION