Cogent C API and Utilities : Version 7.2
	Cascade TextLogger Functions

`LG_Empty`

LG_Empty — specifies a place-holder string for empty data readings.

Syntax

#include <cogent.h>
ST_STATUS LG_Empty( IP_Task*   myself, 
  IP_Task*   textlog, 
  char*   retbuf, 
  int   buflen, 
  char*   emptystring);

Arguments

myself: A pointer to this task's IP_Task structure normallly generated by a call to IP_NserveInit.
textlog: A pointer to the Cascade TextLogger's IP_Task structure, normally generated by a call to IP_TaskFindName.
retbuf: A pointer to a character buffer to hold the return from the call.
buflen: The length of retbuf, in bytes.
emptystring: The string which will replace a non-existent value when the LG_Collect style is set to fill.

Returns

ST_OK on success. Otherwise ST_ERROR, and the retbuf will contain a more detailed error message (see empty in the Cascade TextLogger documentation). If the return value is ST_OK, the retbuf may not contain useful information.

Description

This function lets you specify a string to be written whenever there is no data available for a point. This is a global value, applied to all logs.

This function corresponds to the Cascade TextLogger empty command.

`ST_STATUS LG_Empty(`	IP_Task*	`myself`,
	IP_Task*	`textlog`,
	char*	`retbuf`,
	int	`buflen`,
	char*	`emptystring)`;


LG_Disable		LG_Enable