opening-and-closing-a-winsnmp-application.md

title	description	ms.assetid	ms.topic	ms.date
Opening and Closing a WinSNMP Application	The WinSNMP application must call the SnmpStartup function successfully before it calls any other WinSNMP function.	ff2b99c9-c2fd-4bb7-8fd5-799e72c4560d	article	05/31/2018

Opening and Closing a WinSNMP Application

The WinSNMP application must call the SnmpStartup function successfully before it calls any other WinSNMP function. The SnmpStartup function enables the Microsoft WinSNMP implementation to perform initialization procedures. The function also returns to the application the version of the WinSNMP API that the implementation supports, the level of SNMP communications it supports, and the implementation's default translation and retransmission modes.

The WinSNMP application must call the SnmpCleanup function when the application no longer requires the implementation's services. Even though SnmpCleanup enables the implementation to deallocate all resources allocated to the application, it is recommended that the application first call the SnmpClose function once for each open WinSNMP session, to maximize the implementation's performance. The WinSNMP application must call SnmpCleanup as the last WinSNMP function before it terminates.