SYNTAX

#include "las.h"

FUNCTION c_estep (gdesc)

     int               *gdesc;

PARAMETERS

gdesc (input, integer)

Group descriptor to be used internally by the image I/O subroutines. The calling routine should pass by reference the integer obtained from c_egroup().

DESCRIPTION

The c_estep() call is used to step through all image files in the group and will return offset values into the user's buffer specified in the c_egroup() are for each band on a read or where the next line will be written on a write. See the offset parameter in c_eopens() for a description of these offset values. Note: One c_estep() should be called before any processing is done in order to read the first line for input or initialize the first line for output.

RETURN VALUE

c_estep() returns

     E_SUCC (0)  --> success 
     E_FAIL (-1) --> failure