EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 75)

These methods return information about the storage of the data in the

backing file.

getBackingFileRowBytes returns the number of bytes

for each row.

getBackingFileColumnOffsetBytes returns the offset in

bytes from the beginning of the row to the specified column data.

getBackingFileColumnWidthBytes returns the number of bytes used

to store the data for the specified row.

CNKBackingFileBuf::

void closeBackingFile();

This method closes the backing file if it is open.

CNKBufReader

Methods

Here are the methods for reading a CNKBuf using a CNKBufReader.

Note that there is no public constructor for a

CNKBufReader object (it

is created automatically in

CNKProc::setInputBuf), and no public

init() method (it is initialized in CNKBuf::init()).

CNKBufReader::

CNKBuf* getBuf();

CNKProc* getProc();

Returns the CNKBuf or CNKProc linked by this CNKBufReader.

CNKBufReader::

virtual void setRequestRows(long numRows);

virtual long getRequestRows();

A CNKProc calls setRequestRows to set the number of data rows that

are desired.

setRequestRows can be called multiple times, to adjust

this number up or down.

getRequestRows returns the last row

request. When the

CNKBuf is initialized, the row request number is

initialized to zero.

When a

CNKProc calls setRequestRows, if numRows is greater than the

total number of rows in the

CNKBuf, or if numRows is greater than

CNKProc::getNumRows(), then an error string is set for the CNKProc.

CNKBufReader::

virtual long getRowsReady();

getRowsReady

returns the number of data rows that are available to

read. At any given time, it may be less than the row request, equal to

it, or even greater (if there happen to be more rows available than the

request). However, the programmer can depend on it's always

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