Cogent C API and Utilities : Version 6.4
	Cascade Historian Functions

`HI_BufferIDLength`

HI_BufferIDLength — gives the length of an interpolation buffer.

Syntax

#include <cogent.h>
ST_STATUS HI_BufferIDLength( IP_hTASK   historian, 
  char*   retbuf, 
  int   buflen, 
  int   bufferid, 
  int*   length);

Arguments

historian: The task pointer to the Cascade Historian program.
retbuf: An optional buffer containing an error message.
buflen: The length in bytes of retbuf. If retbuf is non-NULL, this must be a valid non-zero length. If retbuf is NULL, this parameter is ignored.
bufferid: The buffer identifier, as created by a call to HI_Interpolate.
length: Return value containing the number of values in an interpolation buffer.

Returns

ST_OK on success. Otherwise ST_ERROR, and the retbuf will contain a NULL-terminated character string with an error message. If the return value is ST_OK, the retbuf may not contain useful information.

Description

This function determines the exact number of values in the interpolation buffer identified by bufferid, and returns that number in length.

This function corresponds to the Cascade Historian bufferIdLength command and two dynamic library functions: hist_buffer_id_length and hist_length_buffer.

`ST_STATUS HI_BufferIDLength(`	IP_hTASK	`historian`,
	char*	`retbuf`,
	int	`buflen`,
	int	`bufferid`,
	int*	`length)`;


HI_BufferIDDestroy		HI_BufferIDRead