What's an easy to use SNMP client library for c++?
Probably the best choice is net-snmp. Note that the library has "C" linkage but will work just fine with C++.
SNMP++ is also a nice and open source library for C++ developers.
I have found that Net-SNMP does not support multi-threading with v3 type queries. So if you are writing an SNMP monitoring tool that will be polling multiple hosts then you will need to take this into consideration.
OpenSNMP contains a complete multi-threaded implementation of SNMPv3 that is done in C++ (complete with classes, etc). It's not heavily used and maintained though.
Net-SNMP with v3 over TLS/DTLS is likely to be threadsafe as it's really SNMPv3/USM that contains threading issues. I think.
来源：https://stackoverflow.com/questions/249062/easy-to-use-snmp-client-library-for-c