The SNMPTracer is a singleton class which is used to control the tracing of protocol messaging which may be used for testing/debugging purposes (to see it working, run any of the examples with the -T option). The getDisplayInformation method will return a string with various information items on the installed WinSNMP library such as version, vendor and options.

The WinSNMP and library clean up code is called automatically in the class destructor that is called just before your application terminates. A pointer to the single instance of the manager can be obtained via the getManager method (by the way, this is a spot to see a working implementation of the singleton pattern). To use the library, you need to invoke the startup method on the manager before any other operation. This class wraps the WinSNMP startup and shutdown procedures. In this diagram all the library classes are represented, including main relationships and public methods. If you understand UML, you can build the big picture in your mind by examining the class diagram of figure 1. Also included are compiled and running versions of the example tools: SNMPGET, SNMPSET, SNMPWALK, SNMPTRAP and SNMPSCAN. The files include the complete source code (text format) and UML model (Visio format) under the GPL license, together with VS 2005 Beta 2 project files. The whole idea of producing the article is just to share the work with the community. The contents of this article are the result of some cleaning up around some code I had stashed away from some experiments on the STL and the WinSNMP library I performed some time ago. For that other sources are available, namely other CodeProject articles or open source projects. Please note that it is not the intent of the article to present any help on SNMP or the WinSNMP API itself, nor to provide a full featured library. The wrapper, referred to as library in this article, intends to ease development of WinSNMP managers (clients) and makes use of the STL.

This article presents an example of how to build a C++ wrapper over a Windows API, in this case the WinSNMP library, in order to hide the interface complexity from the user.

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