Echelon OpenLDV User Manual download pdf (Page 55)

OpenLDV Programmer’s Guide 47

Return Code

Numeric

Value Description

LDV_NO_RESOURCES 8 No resources are available.

This code is returned if the

OpenLDV API has assigned

too many session handles, or if

the computer running your

application has memory

allocation problems. Close

any non-essential processes

running on your computer and

try the operation again.

LDV_INVALID_BUF_LEN 9 This code is returned if you

call ldv_read() to read a

message from a L

ONWORKS

interface device, and the

specified buffer is not big

enough to contain the next

incoming message. Allocate a

larger buffer to receive the

message and then call

ldv_read() again with a

larger value for the len input

parameter. The message

remains as the next incoming

message until you successfully

read it with the ldv_read()

function.

Recommendation: Allocate

a buffer of at least 257 bytes

(the maximum size of an SICB

format incoming message)

each time you call ldv_read().

If your device uses the LdvEx

format, you must allocate

additional buffer space.

LDV_NOT_ENABLED 10 This return code is obsolete.

LDVX_INITIALIZATION_FAILED 11 The remote network interface

(RNI) could not be initialized.

Generally, this code is

returned if there are

configuration problems on the

network interface that you are

opening or on the computer

that is running your

application.

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