IlvShapeDBFReader Class Reference

This class reads attributes from .dbf files. More...

#include <ilviews/maps/format/shapefile/dbfreader.h>

Public Member Functions
	IlvShapeDBFReader (const char *filename)
	Initializes an IlvShapeDBFReader to read from the file whose name is specified. More...
	IlvShapeDBFReader (IL_STDPREF istream &stream)
	Initializes an IlvShapeDBFReader to read from the specified input stream. More...
int	getCurrentIndex ()
	Returns the index of the next field that will be read. More...
const IlvFeatureAttributeInfo *	getInfo ()
	Returns a description of the attributes. More...
IlvMapsError	getInitStatus ()
	Checks the initialization status of this reader. More...
IlvFeatureAttributeProperty *	getNextRecord (IlvMapsError &status)
	Reads the next record in the .dbf file. The caller is responsible for deallocation of returned data. More...
int	getRecordCount ()
	Returns the number of records contained in the .dbf file from which the attributes are read. More...
IlvFeatureAttributeProperty *	readRecord (int index, IlvMapsError &status)
	Reads the record corresponding to the specified index (see restrictions below). Restrictions: More...

Detailed Description

This class reads attributes from .dbf files.

Library: ilvmaps

This class can be used to read shape files with the .dbf extension. The .dbf files contain the attributes of the map objects.

This reader can be used as an iterator on a .dbf file. It can also be used to directly access the records in the file (or more precisely their index) if it was created with the constructor that takes a file name as argument.

See also

IlvShapeFileReader

Constructor & Destructor Documentation

IlvShapeDBFReader::IlvShapeDBFReader

(

const char *

filename

)

Initializes an IlvShapeDBFReader to read from the file whose name is specified.

Parameters

filename

The name of the input file.

IlvShapeDBFReader::IlvShapeDBFReader

(

IL_STDPREF istream &

stream

)

Initializes an IlvShapeDBFReader to read from the specified input stream.

Parameters

stream

The input stream.

Member Function Documentation

int IlvShapeDBFReader::getCurrentIndex

(

)

Returns the index of the next field that will be read.

Returns

The index of the next field that will be read.

const IlvFeatureAttributeInfo* IlvShapeDBFReader::getInfo

(

)

Returns a description of the attributes.

Returns the types and names of the field contained in the .dbf file.

Returns

An IlvFeatureAttributeInfo that describes this attribute file.

IlvMapsError IlvShapeDBFReader::getInitStatus

(

)

Checks the initialization status of this reader.

Returns

IlvMaps::NoError() if the initialization of this reader is successful, or an error if an error occured during the initalization.

IlvFeatureAttributeProperty* IlvShapeDBFReader::getNextRecord

(

IlvMapsError &

status

)

Reads the next record in the .dbf file. The caller is responsible for deallocation of returned data.

Parameters

status

An IlvMapsError to store the status of the read process.

Returns

The read feature attributes.

int IlvShapeDBFReader::getRecordCount

(

)

Returns the number of records contained in the .dbf file from which the attributes are read.

Returns

The number of records.

IlvFeatureAttributeProperty* IlvShapeDBFReader::readRecord	(	int	index,
		IlvMapsError &	status
	)

Reads the record corresponding to the specified index (see restrictions below).
Restrictions:

• Since this function uses a random access to the file, this method can only be called when this dbf reader is built from a filename or a random access able input stream.
• Since this function changes the current index, it should not be used if the reader itself is used by another feature iterator, such as the IlvShapeFileReader.

Parameters

index	The index of the record to be read, in the range [0, this->getRecordCount()].
status	An IlvMapsError to store the status of the read process.

Returns

The read feature attributes.