Describes the stream itself, in particular the compression used, current packetDescriptors, etc. More...

#include <das2/stream.h>

Inheritance diagram for DasStream:

Collaboration diagram for DasStream:

[legend]

Public Member Functions
DAS_API DasStream *	new_DasStream (void)
	Creates a new blank StreamDesc. More...

DAS_API char *	DasStream_info (const DasStream pSd, char sBuf, int nLen)
	Print a short description of the stream to a string buffer, This is not a serialization, just an overview.

DAS_API DasStream *	DasStream_copy (const DasStream *pThis)
	Creates a deep-copy of an existing DasStream object. More...

DAS_API void	del_DasStream (DasStream *pThis)
	Delete a stream descriptor and all it's sub objects. More...

DAS_API size_t	DasStream_getNPktDesc (const DasStream *pThis)
	Get the number of packet descriptors defined for this stream. More...

DAS_API DasDesc *	DasStream_nextPktDesc (const DasStream pThis, int pPrevPktId)
	Iterate over packet descriptiors. More...

DAS_API DasErrCode	DasStream_addPktDesc (DasStream pThis, DasDesc pDesc, int nPktId)
	Attach a packet descriptor to this stream. More...

DAS_API void	DasStream_setMonotonic (DasStream *pThis, bool isMonotonic)
	Indicates if the xtags on the stream are monotonic, in which case there might be optimal ways of processing the stream.

DAS_API void	DasStream_addStdProps (DasStream *pThis)
	Adds metadata into the property set of the DasStream. More...

DAS_API void	DasStream_addCmdLineProp (DasStream pThis, int argc, char argv[])
	Adds the command line into the property set of the DasStream. More...

DAS_API PktDesc *	DasStream_createPktDesc (DasStream pThis, DasEncoding pXEncoder, das_units xUnits)
	Creates a descriptor structure that for a stream packet type. More...

DAS_API DasFrame *	DasStream_createFrame (DasStream pThis, ubyte id, const char sName, const char *sType)
	Define a new vector direction frame for the stream. More...

DAS_API PktDesc *	DasStream_clonePktDesc (DasStream pThis, const PktDesc pd)
	Make a deep copy of a PacketDescriptor on a new stream. More...

DAS_API PktDesc *	DasStream_clonePktDescById (DasStream pThis, const DasStream pOther, int nPktId)
	Deepcopy a PacketDescriptor from one stream to another. More...

DAS_API PktDesc *	DasStream_getPktDesc (const DasStream *pThis, int id)
	Get the packet descriptor associated with an ID. More...

DAS_API const DasFrame *	DasStream_getFrame (const DasStream *pThis, int idx)
	Get a frame pointer by it's index. More...

DAS_API const DasFrame *	DasStream_getFrameByName (const DasStream pThis, const char sFrame)
	Get a frame pointer by it's name. More...

const DasFrame *	DasStream_getFrameById (const DasStream *pThis, ubyte id)
	Get a frame pointer by it's id. More...

DAS_API DasErrCode	DasStream_freeSubDesc (DasStream *pThis, int nPktId)
	Free any resources associated with this PacketDescriptor, and release it's id number for use with a new PacketDescriptor.

DAS_API int	DasStream_getOffset (DasStream *pThis)
	An I/O function that makes sense to use for either operation.

DAS_API DasErrCode	DasStream_encode (DasStream pThis, DasBuf pBuf)
	Encode a DasStream to an XML string. More...

#define	DasDesc_type(P) ((P)->type)
	Get the type of this descriptor. More...

DAS_API void	DasDesc_init (DasDesc *pThis, desc_type_t type)
	Initialize a memory location as a valid das descriptor.

DAS_API char *	DasDesc_info (const DasDesc pThis, char sBuf, int nLen, char *sIndent)
	Print 1-line versions of each property in a descriptor.

DAS_API bool	DasDesc_equals (const DasDesc pThis, const DasDesc pOther)
	Check to see if two descriptors contain the same properties Note, the order of the properties may be different between the descriptors but if the contents are the same then the descriptors are considered to be equal. More...

DAS_API const DasDesc *	DasDesc_parent (DasDesc *pThis)
	The the parent of a Descriptor. More...

DAS_API size_t	DasDesc_length (const DasDesc *pThis)
	Get the number of properties in a descriptor. More...

DAS_API const DasProp *	DasDesc_getPropByIdx (const DasDesc *pThis, size_t uIdx)
	Get a property name by an index. More...

DAS_API const char *	DasDesc_getNameByIdx (const DasDesc *pThis, size_t uIdx)
	Get a property name by an index. More...

DAS_API const char *	DasDesc_getValByIdx (const DasDesc *pThis, size_t uIdx)
	Get a property value by an index. More...

DAS_API const char *	DasDesc_getTypeByIdx (const DasDesc *pThis, size_t uIdx)
	Get a data type of a property by an index.

DAS_API const char *	DasDesc_getTypeByIdx3 (const DasDesc *pThis, size_t uIdx)
	Get a data type of a property by an index, das3 covention.

DAS_API bool	DasDesc_has (const DasDesc pThis, const char sName)
	Determine if a property is present in a Descriptor or it's ancestors. More...

DAS_API DasErrCode	DasDesc_set (DasDesc pThis, const char sType, const char sName, const char sVal)
	Generic property setter. More...

DAS_API bool	DasDesc_remove (DasDesc pThis, const char sName)
	Remove a property from a descriptor, if preset. More...

DAS_API const char *	DasDesc_getStr (const DasDesc pThis, const char sName)
	read the property of type String named sName.

DAS_API size_t	DasDesc_getStrAry (DasDesc pThis, const char sName, char pBuf, size_t uBufSz, char *psVals, size_t uMaxVals)
	Get a multi-valued string property. More...

DAS_API DasErrCode	DasDesc_setStr (DasDesc pThis, const char sName, const char *sVal)
	SetProperty methods add properties to any Descriptor (stream,packet,plane). More...

DAS_API DasErrCode	DasDesc_vSetStr (DasDesc pThis, const char sName, const char *sFmt,...)
	Set a string property in the manner of sprintf.

DAS_API double	DasDesc_getDouble (const DasDesc pThis, const char sName)
	Read the property of type double named sName. More...

DAS_API DasErrCode	DasDesc_setDouble (DasDesc pThis, const char sName, double value)
	Set property of type double. More...

DAS_API double	DasDesc_getDatum (DasDesc pThis, const char sName, das_units units)
	Get the a numeric property in the specified units. More...

DAS_API DasErrCode	DasDesc_setDatum (DasDesc pThis, const char sName, double rVal, das_units units)
	Set property of type Datum (double, UnitType pair) More...

DAS_API double *	DasDesc_getDoubleAry (DasDesc pThis, const char sName, int *pNumItems)
	Get the values of an array property. More...

DAS_API DasErrCode	DasDesc_setDoubleArray (DasDesc pThis, const char sName, int nItems, double *pValues)
	Set the property of type double array.

DAS_API int	DasDesc_getInt (const DasDesc pThis, const char sName)
	Get a property integer value. More...

DAS_API DasErrCode	DasDesc_setInt (DasDesc pThis, const char sName, int nVal)
	Set the property of type int.

DAS_API bool	DasDesc_getBool (DasDesc pThis, const char sName)
	Get a property boolean value. More...

DAS_API DasErrCode	DasDesc_setDatumRng (DasDesc pThis, const char sName, double beg, double end, das_units units)
	Set property of type DatumRange (double, double, UnitType triple)

DAS_API DasErrCode	DasDesc_getStrRng (DasDesc pThis, const char sName, char sMin, char sMax, das_units *pUnits, size_t uLen)
	Get a property of type DatumRange with unconverted strings. More...

DAS_API DasErrCode	DasDesc_setFloatAry (DasDesc pThis, const char sName, int nItems, float *pValues)
	Set the property of type float array. More...

DAS_API void	DasDesc_copyIn (DasDesc pThis, const DasDesc pOther)
	Deepcopy properties into a descriptor. More...

DAS_API DasErrCode	DasDesc_encode2 (DasDesc pThis, DasBuf pBuf, const char *sIndent)
	Encode a generic set of properties to a buffer. More...

Data Fields
DasDesc	base
	The base structure.

DasFrame *	frames [MAX_FRAMES]
	List of defined coordinate frames.

void *	pUser
	User data pointer. More...

Detailed Description

Describes the stream itself, in particular the compression used, current packetDescriptors, etc.

This is a container for top-level stream descriptor objects. The data owner ship model for das2C is:

DasStream -> PktDesc -> PlaneDesc -> 1-row of data -> DasDs -> DasAry -> arbitrary rows of data -> DasDim -> DasVar (Structure access to DasDs Arrays)

Anything not owned by DasStream is considered OOB (Out Of Band) data.

All top level descriptors my be accessed by an integer ID. There is one ID space for all desciptors, not a separate one for datasets (das3) versus packets (das2)

ID 0 is reserved for the stream descriptor itself.

Desciptor IDs: The lookup ID is the same value used as the header & data IDs in the stream. The legal packet ID range depends on the stream serilazation method. For the das2 format, the valid range is 0 to 99.

For the das3 format, packet ID's must be positive and fit in an integer so the maximum is about 2.1 billion.

Note that das v2 Streams can re-use packet ID's. So the PacketDescriptor at, for example, ID 2 may be completely different from one invocation of a stream handler callback to another.

Since das v3 streams have no packet length limitations, ID reuse is not permitted on a single stream.

Member Function Documentation

◆ new_DasStream()

DAS_API DasStream * new_DasStream ( void )

Creates a new blank StreamDesc.

The returned structure has no packet descriptors, no properties are defined. The compression attribute is set to 'none' and the version is set to 2.2

◆ DasStream_copy()

DAS_API DasStream * DasStream_copy ( const DasStream * pThis )

Creates a deep-copy of an existing DasStream object.

An existing stream descriptor, probably one initialized automatically by reading standard input, can be used as a template for generating a second stream descriptor. This is a deep copy, all owned objects are copied as well and may be changed with out affecting the source object or it components.

Parameters

pThis The stream descriptor to copy

Returns: A new stream descriptor allocated on the heap with all associated packet descriptors attached and also allocated on the heap

◆ del_DasStream()

DAS_API void del_DasStream ( DasStream * pThis )

Delete a stream descriptor and all it's sub objects.

Parameters

pThis The stream descriptor to erase, the pointer should be set to NULL by the caller.

◆ DasStream_getNPktDesc()

DAS_API size_t DasStream_getNPktDesc ( const DasStream * pThis )

Get the number of packet descriptors defined for this stream.

Warning: It is possible to have a non-contiguous set of Packet IDs. Unless the application insures by some mechanism that packet IDs are not skipped when calling functions like DasStream_addPktDesc() then the results of this function will not useful for iteration.

Parameters

pThis The stream descriptor to query

Returns: Then number of packet descriptors attached to this stream descriptor. For better performance the caller should reused the return value as all possible packet ID's are tested to see home many are defined.

◆ DasStream_nextPktDesc()

DAS_API DasDesc * DasStream_nextPktDesc	(	const DasStream *	pThis,
		int *	pPrevPktId
	)

Iterate over packet descriptiors.

Here's one way to use this function in a loop:

int nPktId = 0;
DasDesc* pDesc = NULL;
while((pDesc = DasStream_nextPktDesc(pSd, &nPktId)) != NULL){
  // Do stuff
  // call DasDesc_type() to further sub-divide actions
}

Parameters

pThis	A stream descriptor structure
pPrevPktId	A pointer to the ID of a previous packet descriptor. Will be incremented to the next valid packet ID

Returns: The packet descriptor for the next valid packet ID, or NULL if there was no next valid packet descriptor.

◆ DasStream_addPktDesc()

DAS_API DasErrCode DasStream_addPktDesc	(	DasStream *	pThis,
		DasDesc *	pDesc,
		int	nPktId
	)

Attach a packet descriptor to this stream.

The stream takes ownership of the packet descriptor. It will be deleted when the stream is deleted.

Parameters

pThis	The stream to receive the packet descriptor. The PkdDesc object will have it's parent pointer set to this object.
pDesc	Must be a pointer to a descriptor of type PktDesc or DasDs. If the descriptor has a parent and it's not this stream object, an error will be thrown.
nPktId	The ID for the new packet descriptor.

Returns: 0 on success or a positive error code on failure.

◆ DasStream_addStdProps()

DAS_API void DasStream_addStdProps ( DasStream * pThis )

Adds metadata into the property set of the DasStream.

These include the creation time, the source Id, the process id, the command line, and hostname.

◆ DasStream_addCmdLineProp()

DAS_API void DasStream_addCmdLineProp	(	DasStream *	pThis,
		int	argc,
		char *	argv[]
	)

Adds the command line into the property set of the DasStream.

This can be useful when debugging.

◆ DasStream_createPktDesc()

DAS_API PktDesc * DasStream_createPktDesc	(	DasStream *	pThis,
		DasEncoding *	pXEncoder,
		das_units	xUnits
	)

Creates a descriptor structure that for a stream packet type.

Initially this descriptor will only have xtags, but additional data planes are added. The packet ID for the new descriptor is automatically assigned so to be the lowest legal ID not currently in use.

Parameters

pThis	The stream descriptor object that will receive the new packet type.
xUnits	is a UnitType (currently char *) that describes the data. Generally this is used to identify times (e.g.UNIT_MJ1958,UNIT_US2000) or is UNIT_DIMENSIONLESS, but other UnitTypes are defined (e.g. UNIT_HERTZ, UNIT_DB).
pXEncoder	The encoder for X-plane values on this stream. The DasStream object takes ownership of the encoder's memory.

Returns: A pointer to new PacketDescriptor object allocated on the heap.
This pointer is also stored in the DasStream::packetDescriptors member variable of pThis.

◆ DasStream_createFrame()

DAS_API DasFrame * DasStream_createFrame	(	DasStream *	pThis,
		ubyte	id,
		const char *	sName,
		const char *	sType
	)

Define a new vector direction frame for the stream.

See also: new_DasFrame for arguments

Returns: The newly created frame, or null on a failure. Note that each coordinate frame in the same stream must have a different name

◆ DasStream_clonePktDesc()

DAS_API PktDesc * DasStream_clonePktDesc	(	DasStream *	pThis,
		const PktDesc *	pd
	)

Make a deep copy of a PacketDescriptor on a new stream.

This function makes a deep copy of the given packet descriptor and places it on the provided stream. Note, packet ID's are not preserved in this copy. The newly allocated PacketDescriptor may not have the same packet ID as the old one.

Parameters

pThis	the stream to get the new packet descriptor
pd	The packet descriptor to clone onto the stream

Returns: The newly created packet descriptor

◆ DasStream_clonePktDescById()

DAS_API PktDesc * DasStream_clonePktDescById	(	DasStream *	pThis,
		const DasStream *	pOther,
		int	nPktId
	)

Deepcopy a PacketDescriptor from one stream to another.

The copy made by this function handles recursing down to all the planes and properties owned by the given packet descriptor. Unlike the the function clonePacketDescriptor() the packet ID is preserved across the copy.

Parameters

pThis	the stream descriptor to get the new packet descriptor
pOther	the stream descriptor who's packet descriptor is copied
nPktId	the id of the packet to copy, a value in the range of 0 to 99 inclusive.

Returns: The newly created packet descriptor, or NULL if there was no packet descriptor with that ID in the source.

◆ DasStream_getPktDesc()

DAS_API PktDesc * DasStream_getPktDesc	(	const DasStream *	pThis,
		int	id
	)

Get the packet descriptor associated with an ID.

Parameters

pThis	The stream object which contains the packet descriptors.
id	The numeric packet ID, a value from 1 to 99 inclusive.

Returns: NULL if there is no packet descriptor associated with the given Packet ID

◆ DasStream_getFrame()

DAS_API const DasFrame * DasStream_getFrame	(	const DasStream *	pThis,
		int	idx
	)

Get a frame pointer by it's index.

Parameters

pThis	The stream object which contains the frame definitions
id	The numeric frame index, is not used outside the stream descriptor itself

Returns: NULL if there is no frame at the given index

◆ DasStream_getFrameByName()

DAS_API const DasFrame * DasStream_getFrameByName	(	const DasStream *	pThis,
		const char *	sFrame
	)

Get a frame pointer by it's name.

Parameters

sFrame the name of a frame pointer

Returns: NULL if there is no frame by that name

◆ DasStream_getFrameById()

const DasFrame * DasStream_getFrameById	(	const DasStream *	pThis,
		ubyte	id
	)

Get a frame pointer by it's id.

Parameters

id	the numeric ID of a frame as stored in das_vector

Returns: NULL if there is no frame by that name

◆ DasStream_encode()

DAS_API DasErrCode DasStream_encode	(	DasStream *	pThis,
		DasBuf *	pBuf
	)

Encode a DasStream to an XML string.

Parameters

pThis	The stream descriptor to encode
pBuf	A DasBuffer item to receive the bytes

Returns: 0 if encoding succeeded, a non-zero error code otherwise

◆ DasDesc_equals()

DAS_API bool DasDesc_equals	(	const DasDesc *	pThis,
		const DasDesc *	pOther
	)

inherited

Check to see if two descriptors contain the same properties Note, the order of the properties may be different between the descriptors but if the contents are the same then the descriptors are considered to be equal.

Note that parent descriptor properties are not checked when handling the comparison.

Todo:: maybe check parents too.

Parameters

pThis	The first descriptor
pOther	The second descriptor

◆ DasDesc_parent()

DAS_API const DasDesc * DasDesc_parent ( DasDesc * pThis )

inherited

The the parent of a Descriptor.

Plane descriptors are owned by packet descriptors and packet descriptors are owned by stream descriptors. This function lets you craw the ownership hierarchy

Parameters

pThis

Returns: The owner of a descriptor, or NULL if this is a top level descriptor, (i.e. a Stream Descriptor)

◆ DasDesc_length()

DAS_API size_t DasDesc_length ( const DasDesc * pThis )

inherited

Get the number of properties in a descriptor.

Descriptor's have a hierarchy. In general when a property is requested, if a given Descriptor does not have a property the request is passed to the parent descriptor. This function only returns the number of properties in the given descriptor. It does not include properties owned by parents or ancestors.

This is useful when iterating over all properties in a descriptor.

See also: DasDesc_getNameByIdx(); DasDesc_getValByIdx(); DasDesc_getTypeByIdx()

Parameters

pThis A pointer to the descriptor to query

Returns: The number of properties in this, and only this, descriptor.

◆ DasDesc_getPropByIdx()

DAS_API const DasProp * DasDesc_getPropByIdx	(	const DasDesc *	pThis,
		size_t	uIdx
	)

inherited

Get a property name by an index.

This is useful when iterating over all properties in a Descriptor. Only valid properties owed by a descriptor are queried in this manner. Parent descriptors are not consulted.

See also: DasDesc_length()

Parameters

pThis	A pointer to the descriptor to query
uIdx	The index of the property, will be a value between 0 and the return value from Desc_length(). For efficient storage properties that have been erased or over-written are left in place internally and just marked as invalid.

Returns: A pointer the requested property, or NULL if the property is not valid. A NULL return does not mean than the next higher index has an invalid property

◆ DasDesc_getNameByIdx()

DAS_API const char * DasDesc_getNameByIdx	(	const DasDesc *	pThis,
		size_t	uIdx
	)

inherited

Get a property name by an index.

This is useful when iterating over all properties in a Descriptor. Only properties owed by a descriptor are queried in this manner. Parent descriptors are not consulted.

See also: DasDesc_length()

Parameters

pThis	A pointer to the descriptor to query
uIdx	The index of the property, will be a value between 0 and the return value from Desc_length()

Returns: A pointer the requested property name or NULL if there is no property at the given index.

◆ DasDesc_getValByIdx()

DAS_API const char * DasDesc_getValByIdx	(	const DasDesc *	pThis,
		size_t	uIdx
	)

inherited

Get a property value by an index.

This is useful when iterating over all properties in a Descriptor. Only properties owned by a descriptor are queried in this manner. Parent descriptors are not consulted.

See also: DasDesc_length()

Parameters

pThis	A pointer to the descriptor to query
uIdx	The number of the property, will be a value from 0 and 1 less than the return value from Desc_length()

Returns: A pointer the requested property value or NULL if there is no property at the given index.

◆ DasDesc_has()

DAS_API bool DasDesc_has	(	const DasDesc *	pThis,
		const char *	sName
	)

inherited

Determine if a property is present in a Descriptor or it's ancestors.

Parameters

pThis	the descriptor object to query
sName	the name of the property to retrieve.

Returns: true if the descriptor or one of it's ancestors has a property with the given name, false otherwise.

◆ DasDesc_set()

DAS_API DasErrCode DasDesc_set	(	DasDesc *	pThis,
		const char *	sType,
		const char *	sName,
		const char *	sVal
	)

inherited

Generic property setter.

All properties are stored internally as strings. The various typed Desc_setProp* functions all call this function after converting their arguments to strings.

Warning: To insure that the string to type conversions are consistent it is strongly recommended that you use one of the typed functions instead of this generic version unless you have no choice.

Parameters

pThis	The Descriptor to receive the property
sType	The Type of property. This value is passed down to DasProp_init2(), see that function for a list of known values.
sName	The property name. For das2 & das3 this can't contain spaces.
sVal	The value, which may be anything including NULL

Returns: 0 on success or a positive error code if there is a problem.

◆ DasDesc_remove()

DAS_API bool DasDesc_remove	(	DasDesc *	pThis,
		const char *	sName
	)

inherited

Remove a property from a descriptor, if preset.

It is safe to call this function for properties not present on the descriptor, it simply does nothing and returns false.

Returns: false if the property wasn't present to begin with, true otherwise

◆ DasDesc_getStrAry()

DAS_API size_t DasDesc_getStrAry	(	DasDesc *	pThis,
		const char *	sName,
		char *	pBuf,
		size_t	uBufSz,
		char **	psVals,
		size_t	uMaxVals
	)

inherited

Get a multi-valued string property.

Some properties, especially those from DSDF files, contain multiple string values in a single field separated by pipe "|" characters. For example:

data_01 = 'efield | Electric field intensity | V m**-1'

This function breaks these values into multiple strings without requiring heap memory.

Output bytes are copied into the given val_buf. Then null values are then written over all leading and trailing whitespace for each element as well as the pipe characters.

Finally a pointer to each starting string is copied into ptr_buf. If an element contains not data, for example:

coord_01 = 'frequency | | Hz'

then the corresponding character pointer will be NULL, but the number of character pointers is unchanged.

Parameters

[in]	pThis	the descriptor to query
[in]	name	the name of the property to retrieve
[out]	val_buf	will hold the full output property data
[in]	val_buf_sz	the maximum number of bytes to copy out including the terminating null character.
[out]	ptr_buf	will hold pointers to the start of each property value. If a value is empty, the corresponding pointer is null.
[in]	ptr_buf_sz	the maximum number of string pointers write to ptr_buf.

Returns: The number of string values for this property, which is zero if a property with the given name is not present.

See also: DasDesc_getStr to retrieve the original property value in a single buffer unaltered.

◆ DasDesc_setStr()

DAS_API DasErrCode DasDesc_setStr	(	DasDesc *	pThis,
		const char *	sName,
		const char *	sVal
	)

inherited

SetProperty methods add properties to any Descriptor (stream,packet,plane).

The typed methods (e.g. setPropertyDatum) property tag the property with a type so that it will be parsed into the given type.

◆ DasDesc_getDouble()

DAS_API double DasDesc_getDouble	(	const DasDesc *	pThis,
		const char *	sName
	)

inherited

Read the property of type double named sName.

The property value is parsed using sscanf.

◆ DasDesc_setDouble()

DAS_API DasErrCode DasDesc_setDouble	(	DasDesc *	pThis,
		const char *	sName,
		double	value
	)

inherited

Set property of type double.

◆ DasDesc_getDatum()

DAS_API double DasDesc_getDatum	(	DasDesc *	pThis,
		const char *	sName,
		das_units	units
	)

inherited

Get the a numeric property in the specified units.

Descriptor properties my be provided as Datums. Datums are a double value along with a specified measurement unit.

Parameters

pThis	The Descriptor containing the property in question.
sName	The name of the property to retrieve.
units	The units of measure in which the return value will be represented. If the property value is stored in a different set of units than those indicated by this parameter than the output will be converted to the given unit type.

Returns: The converted value or DAS_FILL_VALUE if conversion to the desired units is not possible.

◆ DasDesc_setDatum()

DAS_API DasErrCode DasDesc_setDatum	(	DasDesc *	pThis,
		const char *	sName,
		double	rVal,
		das_units	units
	)

inherited

Set property of type Datum (double, UnitType pair)

If a property with this name already exists it is 1st deleted and then the new property is added in its place.

Parameters

pThis	The descriptor to receive the property
sName	The name of the property to set
rVal	The numeric value of the property
units	The units of measure for the property

◆ DasDesc_getDoubleAry()

DAS_API double * DasDesc_getDoubleAry	(	DasDesc *	pThis,
		const char *	sName,
		int *	pNumItems
	)

inherited

Get the values of an array property.

Space for the array is allocated by getDoubleArrayFromString. and nitems is set to indicate the size of the array.

Parameters

[in]	pThis	the descriptor object to query
[in]	sName	the name of the proprety to retrieve
[out]	nitems	a pointer to a an integer containing the number of values in the returned array.

Returns: A pointer to a double array allocated on the heap. It is the caller's responsibility to depose of the memory when it is no longer needed. If the named property doesn't exist the program exits.

See also: DasDesc_has()

◆ DasDesc_getInt()

DAS_API int DasDesc_getInt	(	const DasDesc *	pThis,
		const char *	sName
	)

inherited

Get a property integer value.

Parameters

pThis	the descriptor object to query
sName	the name of the proprety to retrieve

Returns: The value of the named property or exits the program if the named proprety doesn't exist in this descriptor.

See also: DasDesc_has()

◆ DasDesc_getBool()

DAS_API bool DasDesc_getBool	(	DasDesc *	pThis,
		const char *	sName
	)

inherited

Get a property boolean value.

Parameters

pThis	the descriptor object to query
sName	the name of the proprety to retrieve

Returns: True if the value is "true", or any positive integer, false otherwise.

◆ DasDesc_getStrRng()

DAS_API DasErrCode DasDesc_getStrRng	(	DasDesc *	pThis,
		const char *	sName,
		char *	sMin,
		char *	sMax,
		das_units *	pUnits,
		size_t	uLen
	)

inherited

Get a property of type DatumRange with unconverted strings.

This version is handy if you just want to know the intrinsic units of the range without converting the values to some specific type of double value.

◆ DasDesc_setFloatAry()

DAS_API DasErrCode DasDesc_setFloatAry	(	DasDesc *	pThis,
		const char *	sName,
		int	nItems,
		float *	pValues
	)

inherited

Set the property of type float array.

Note the array is cast to a double array before encoding.

◆ DasDesc_copyIn()

DAS_API void DasDesc_copyIn	(	DasDesc *	pThis,
		const DasDesc *	pOther
	)

inherited

Deepcopy properties into a descriptor.

Parameters

pThis	the descriptor to receive a copy of the properties
pOther	the descriptor with the properties to be copied.

◆ DasDesc_encode2()

DAS_API DasErrCode DasDesc_encode2	(	DasDesc *	pThis,
		DasBuf *	pBuf,
		const char *	sIndent
	)

inherited

Encode a generic set of properties to a buffer.

Parameters

pThis	The descriptors who's properties should be encoded
pBuf	A buffer object to receive the XML data
sIndent	An indent level for the property strings, makes 'em look nice

Returns: 0 if the operation succeeded, a non-zero return code otherwise.

Field Documentation

◆ pUser

void* pUser

User data pointer.

The stream->packet->plane hierarchy provides a good organizational structure for application data, especially for applications whose purpose is to filter streams. This pointer can be used to hold a reference to information that is not serialized. It is initialized to NULL when a PacketDescriptor is created otherwise the library doesn't deal with it in any other way.

The documentation for this struct was generated from the following file:

das2/stream.h

Public Member Functions

Data Fields

Detailed Description

Member Function Documentation

◆ new_DasStream()

◆ DasStream_copy()

◆ del_DasStream()

◆ DasStream_getNPktDesc()

◆ DasStream_nextPktDesc()

◆ DasStream_addPktDesc()

◆ DasStream_addStdProps()

◆ DasStream_addCmdLineProp()

◆ DasStream_createPktDesc()

◆ DasStream_createFrame()

◆ DasStream_clonePktDesc()

◆ DasStream_clonePktDescById()

◆ DasStream_getPktDesc()

◆ DasStream_getFrame()

◆ DasStream_getFrameByName()

◆ DasStream_getFrameById()

◆ DasStream_encode()

◆ DasDesc_equals()

◆ DasDesc_parent()

◆ DasDesc_length()

◆ DasDesc_getPropByIdx()

◆ DasDesc_getNameByIdx()

◆ DasDesc_getValByIdx()

◆ DasDesc_has()

◆ DasDesc_set()

◆ DasDesc_remove()

◆ DasDesc_getStrAry()

◆ DasDesc_setStr()

◆ DasDesc_getDouble()

◆ DasDesc_setDouble()

◆ DasDesc_getDatum()

◆ DasDesc_setDatum()

◆ DasDesc_getDoubleAry()

◆ DasDesc_getInt()

◆ DasDesc_getBool()

◆ DasDesc_getStrRng()

◆ DasDesc_setFloatAry()

◆ DasDesc_copyIn()

◆ DasDesc_encode2()

Field Documentation

◆ pUser