高手帮忙解决！~急！~！SNMP对话框应用

在MFC的对话框中，对应Button中 加入
Snmp::socket_startup();  // Initialize socket subsystem
   //---------[ make a GenAddress and Oid object to retrieve ]---------------
  UdpAddress address("172.16.30.4");      // make a SNMP++ Generic address
  if ( !address.valid()) {           // check validity of address
  
  }
  Oid oid("1.3.6.1.2.1.3.0");      // default is sysDescr
  
    if ( !oid.valid()) {            // check validity of user oid
    
    }
     //---------[ determine options to use ]-----------------------------------
  snmp_version version=version1;                  // default is v1
  int retries=3;                             // default retries is 1
  int timeout=100;                                // default is 1 second
  u_short port=161;                               // default snmp port is 161
  OctetStr community("public");                   // community name
  
  #ifdef _SNMPv3
  OctetStr privPassword("");
  OctetStr authPassword("");
  OctetStr securityName("");
  int securityModel = SecurityModel_USM;
  int securityLevel = SecurityLevel_authPriv;
  OctetStr contextName("");
  OctetStr contextEngineID("");
  long authProtocol = SNMPv3_usmNoAuthProtocol;
  long privProtocol = SNMPv3_usmNoPrivProtocol;
  v3MP *v3_MP;
  #endif
 
  //----------[ create a SNMP++ session ]-----------------------------------
  int status;
  // bind to any port and use IPv6 if needed
*Snmp snmp(status, 0, (address.get_ip_version() == Adress::version_ipv6));
会在*这个位置报
　Unhandled exception at 0x7c958fea in Manage.exe: 0xC0000005: Access violation writing location 0x00000010.
然后跳出

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