Cogent C API and Utilities : Version 6.4
	Cascade Historian Functions

`HI_Earliest`

HI_Earliest — gives the earliest value in a history.

Syntax

#include <cogent.h>
ST_STATUS HI_Earliest( IP_hTASK   historian, 
  char*   retbuf, 
  int   buflen, 
  char*   histname, 
  HI_stVALUE*   data);

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.
histname: The name of a history.
data: The value and time of the first data item in the history.

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 returns the value for the first data item in the history. This item may be either in a file or in memory.

This function corresponds to the Cascade Historian earliest command and the hist_earliest dynamic library function.

`ST_STATUS HI_Earliest(`	IP_hTASK	`historian`,
	char*	`retbuf`,
	int	`buflen`,
	char*	`histname`,
	HI_stVALUE*	`data)`;


HI_Disable		HI_Enable