I'm working on a Mac OSX program that controls a video processing
card. After opening a session reading from the card works flawlessly,
and the very first set command I send always works, but subsequent
set commands will work or fail depending on which ones I send.
One command that sets aspect ratio (an integer 1 through 7) works
perfectly, yet another that turns on or off a text overlay will only
work once.
I've enabled the snmp debug messages with a ~/.snmp.conf entry and
can see that the working packets are 50 bytes long while that ones
that fail are only 30 bytes.
I've tried using net-snmp 5.4 and get the same behavior as Tiger's
default 5.2.1
I'm currently opening a session and just chattering away, do I maybe
need to close and reopen with each set request?
Objective-C code:
-(id) initWithHost:(NSString*) host
community:(NSString*) community
{
if (nil == host || nil == community) return nil;
self = [super init];
if (nil == self) return nil;
init_snmp("SNMP-Test-Cocoa");
struct snmp_session s;
snmp_sess_init(&s);
s.version = SNMP_VERSION_2c;
s.community = (u_char*)strdup([community UTF8String]);
s.community_len = strlen((char*)s.community);
s.peername = strdup([host UTF8String]);
session = snmp_open(&s);
if (NULL == session) {
[self release];
return nil;
}
return self;
}
-(void) setOidIntValue:(NSString *)objectIdString value:(int)intVal
{
if (NULL == session) exit;
size_t length = MAX_OID_LEN;
oid objectid[MAX_OID_LEN];
read_objid([objectIdString UTF8String], objectid, &length);
struct snmp_pdu *pdu = snmp_pdu_create(SNMP_MSG_SET);
char value = intVal + 0x30;
snmp_add_var(pdu, objectid, length, 'i', &intVal);
struct snmp_pdu *response = NULL;
int status = snmp_synch_response(session, pdu, &response);
if (status == STAT_SUCCESS)
if (response->errstat != SNMP_ERR_NOERROR)
NSLog(@"Error in SNMP Packet");
if (response)
{
snmp_free_pdu(response);
}
}
Ward Witt
The Filmworkers Club
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