VECHASH

Description

VECHASH computes a hash number that represents an entire vector segment. This hash number is used as a checksum for software testing.

Parameters

Name	Type	Caption	Length	Value range
FILE *	String	Input file name	1 - 192
DBVS *	Integer	Input vector segment	1 - 48
HASHOPT	String	Vector hash options	0 - 64	Default: ALL
REPORT	String	Report mode	0 - 192	Quick links
MONITOR	String	Monitor mode	0 - 3	ON, OFF Default: ON

* Required parameter

Parameter descriptions

FILE

Specifies the name of the GDB-supported file containing the vector segment for which the hash number will be computed.

DBVS

Specifies the input vector segment(s) to be processed.

Ranges of channels or segments can be specified with negative values. For example, {1,-4,10} is internally expanded to {1,2,3,4,10}. When you are not specifying a range in this way, only 48 numbers can be specified explicitly.

HASHOPT

Specifies the data types from the vector layer to be included when computing the hash value. Multiple options may be specified to compute a joint hashing value; for example, HASHOPT = SCHEMA ATTRIBUTES.

Valid options include:

VERTICES: hash value is based on (X,Y,Z) vertices
ATTRIBUTES: hash value is based on field values
RST: hash value is based on a Representation Style Table
SCHEMA: hash value is based on specified field names/types
PROJ: hash value is based on projection information
ALL: hash value is based on all of the above; this is the default value
SCHEMA ATTRIBUTES: computes hash values for multiple listed types

REPORT

Specifies where to direct the generated report.

Available options are:

TERM: generates a report on the terminal (default)
DISK: generates a report on file "IMPRPT.LST"
OFF: turns off report generation
<filename>: appends a report to the specified file

MONITOR

The program progress can be monitored by printing the percentage of processing completed. A system parameter, MONITOR, controls this activity.

Available options are:

ON: Turns the monitor ON (default)
OFF: Turns the monitor OFF (recommended if running in batch or background mode)

Details

VECHASH computes a hash value for a vector segment in a GDB-supported file. This function is primarily used for the construction of test procedures.

Example

Compute and display the hash values for each of the vector segments in irvine.pix.

EASI>FILE="irvine.pix"		! File containing the vector data
EASI>DBVS=25,26			! Vector segments to process
EASI>HASHOPT=				! Default is "ALL"


EASI>RUN VECHASH
EASI>PRINT IMSTAT

Environments	PYTHON :: EASI
Quick links	Description :: Parameters :: Parameter descriptions :: Details :: Example :: Related