please dont rip this site Prev Next

SnmpMgrGetTrap info  Overview  Group

The SnmpMgrGetTrap function returns outstanding trap data that the caller has not received if trap reception is enabled.

BOOL SnmpMgrGetTrap(

    AsnObjectIdentifier *enterprise,

// generating enterprise

    AsnNetworkAddress *IPAddress,

// generating IP address

    AsnInteger *genericTrap,

// generic trap type

    AsnInteger *specificTrap,

// enterprise-specific type

    AsnTimeticks *timeStamp,

// time stamp

    RFC1157VarBindList *variableBindings

// variable bindings



[out] Points to an object identifier that specifies the enterprise that generated the SNMP trap.
[out] Points to the IP address of the enterprise that generated the SNMP trap.
[out] Points to an indicator of the generic trap. This parameter can be one of the following values:




The agent is initializing protocol entities on the managed mode. It may alter objects in its view.


The agent is re-initializing itself but it will not alter objects in its view.


An attached interface has changed from the up state to the down state. The first variable in the variable bindings list identifies the interface.


An attached interface has changed from the down state to the up state. The first variable in the variable bindings list identifies the interface.


An SNMP entity has sent an SNMP message, but it has falsely claimed to belong to a known community.


An EGP peer has changed to the down state. The first variable in the variable bindings list identifies the IP address of the EGP peer.


An extraordinary event has occurred and it is identified in the specificTrap parameter with an enterprise-specific value.

[out] Points to an indication of the specific trap generated.
[out] Points to a variable to receive the time stamp.
[out] Points to the variable bindings list.

Return Values

If the function returns a trap, the return value is nonzero.

You should call the SnmpMgrGetTrap function repeatedly until GetLastError returns zero. GetLastError may also return the following error codes:

Error Code



Indicates errors were encountered; traps are not accessible.


Indicates no traps are available.


Indicates a memory allocation error.


You must allocate memory for the list member of the RFC1157VarBindList structure with the SnmpUtilMemAlloc function but you do not need to free it.

Once an operating system completes a task, it sends a trap signal. An internal SNMP signal checks for the trap signal to notify the SNMP manager of the completed task. The event that the phTrapAvailable parameter of the SnmpMgrTrapListen function points to allows event-driven acquisition of SNMP traps. You can ignore the trap and poll the SnmpMgrGetTrap function for traps at regular intervals instead.

Another method to acquire traps is to create a thread to wait on the event using the WaitForSingleObject function. When the event occurs, the thread should clear the event using the ResetEvent function. Then the thread should repeatedly call SnmpMgrGetTrap until it returns zero.

Always call the SnmpMgrTrapListen function before calling SnmpMgrGetTrap to receive traps. If an SNMP manager application calls SnmpMgrGetTrap first to receive traps, it returns zero, even if there are traps available. If the application calls GetLastError before calling SnmpMgrTrapListen, GetLastError returns the error code SNMP_MGMTAPI_TRAP_ERRORS.

See Also

SnmpMgrTrapListen, SnmpUtilMemAlloc, WaitForSingleObject, RFC1157VarBindList, ResetEvent

See also:

file: /Techref/os/win/api/win32/func/src/f86_2.htm, 8KB, , updated: 2000/4/7 12:19, local time: 2022/5/18 03:13,

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> SnmpMgrGetTrap</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2022 contributors:
o List host: MIT, Site host, Top posters @20220518
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.

Welcome to!