Ok, i have gotten pretty far with SNMP and C#, but now what is stumping me is how to create an IntPrt from a string. Here is my code: private void SendMess(string SendCode,string CodeDesc,string PsapName,string AlarmServer) { SNMPAPI_STATUS Result = new SNMPAPI_STATUS(); // set up the call back function SnmpAPI.SnmpCallback SnmpCB = new SnmpAPI.SnmpCallback(OnSnmpMessage); // get the local and remote ip addresses string LocalAddr = System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName()).AddressList[0].ToString(); string RemoteAddr = System.Net.Dns.GetHostByName(AlarmServer).AddressList[0].ToString(); int major, minor, level, translate, retran; // call SnmpStartup Result = SnmpAPI.SnmpStartup(out major, out minor, out level, out translate, out retran); if (Result != SNMPAPI_STATUS.SNMPAPI_SUCCESS) throw new Exception("SNMP Initialization Error"); // call snmpcreatesession IntPtr Session = SnmpAPI.SnmpCreateSession(IntPtr.Zero, 0, SnmpCB, IntPtr.Zero); if (Result == SNMPAPI_STATUS.SNMPAPI_FAILURE) throw new Exception("SNMP Create Session Error"); // create entities for the source and destination addresses IntPtr Source = SnmpAPI.SnmpStrToEntity(Session,LocalAddr); IntPtr Destin = SnmpAPI.SnmpStrToEntity(Session,RemoteAddr); // create the oids // oid 1 WinSnmp.SMIOID OID1 = new SMIOID(); Result = SnmpAPI.SnmpStrToOid("1.3.6.1.4.1.9876.1",ref OID1); if (Result == SNMPAPI_STATUS.SNMPAPI_FAILURE) throw new Exception("SNMP StrToOid Failure"); // oid 2 WinSnmp.SMIOID OID2 = new SMIOID(); Result = SnmpAPI.SnmpStrToOid("1.3.6.1.4.1.9876.2",ref OID2); if (Result == SNMPAPI_STATUS.SNMPAPI_FAILURE) throw new Exception("SNMP Initialization Error"); // oid 3 WinSnmp.SMIOID OID3 = new SMIOID(); Result = SnmpAPI.SnmpStrToOid("1.3.6.1.4.1.9876.3",ref OID3); if (Result == SNMPAPI_STATUS.SNMPAPI_FAILURE) throw new Exception("SNMP Initialization Error"); // create te first variable list WinSnmp.SMIVALUE Val1 = new SMIVALUE(); WinSnmp.SMIOCTETS Oct1 = new SMIOCTETS(); Oct1.size = (uint)SendCode.Length; byte[] c1 = new byte[] {SendCode.ToCharArray()}; Oct1.octets = c1; //-- MY PROBLEM IS HERE Val1.type = WinSnmp.SNMPAPI_SYNTAX.SNMP_SYNTAX_OCTETS; Val1.val.str = Oct1; IntPtr VbL1 = SnmpAPI.SnmpCreateVbl(Session,ref OID1,ref Val1); // create second variable list WinSnmp.SMIVALUE Val2 = new SMIVALUE(); IntPtr Code2 = SnmpAPI.SnmpStrToEntity(Session,CodeDesc); WinSnmp.SMIOCTETS Oct2 = new SMIOCTETS(); Oct2.size = (uint)CodeDesc.Length; Oct2.octets = Code2; Val2.type = WinSnmp.SNMPAPI_SYNTAX.SNMP_SYNTAX_OCTETS; Val2.val.str = Oct2; IntPtr VbL2 = SnmpAPI.SnmpCreateVbl(Session,ref OID2,ref Val2); // create third variable list WinSnmp.SMIVALUE Val3 = new SMIVALUE(); IntPtr Code3 = SnmpAPI.SnmpStrToEntity(Session,PsapName); WinSnmp.SMIOCTETS Oct3 = new SMIOCTETS(); Oct3.size = (uint)PsapName.Length; Oct3.octets = Code3; Val3.type = WinSnmp.SNMPAPI_SYNTAX.SNMP_SYNTAX_OCTETS; Val3.val.str = Oct3; IntPtr VbL3 = SnmpAPI.SnmpCreateVbl(Session,ref OID3,ref Val3); // now create the protocol data units IntPtr Pdu1 = SnmpAPI.SnmpCreatePdu(Session,(int)WinSnmp.SNMPAPI_PDU.SNMP_PDU_SET,0,0,0,VbL1); IntPtr Pdu2 = SnmpAPI.SnmpCreatePdu(Session,(int)WinSnmp.SNMPAPI_PDU.SNMP_PDU_SET,0,0,0,VbL2); IntPtr Pdu3 = SnmpAPI.SnmpCreatePdu(Session,(int)WinSnmp.SNMPAPI_PDU.SNMP_PDU_SET,0,0,0,VbL3); // now get the destination octets WinSnmp.SMIOCTETS dOct1 = new SMIOCTETS(); dOct1.size = (uint)SendCode.Length; dOct1.octets = Code1; IntPtr Context1 = SnmpAPI.SnmpStrToContext(Session,ref dOct1); WinSnmp.SMIOCTETS dOct2 = new SMIOCTETS(); dOct2.size = (uint)CodeDesc.Length; dOct2.octets = Code2; IntPtr Context2 = SnmpAPI.SnmpStrToContext(Session,ref dOct2); WinSnmp.SMIOCTETS dOct3 = new SMIOCTETS(); dOct3.size = (uint)PsapName.Length; dOct3.octets = Code1; IntPtr Context3 = SnmpAPI.SnmpStrToContext(Session,ref dOct3); // now send the messages SnmpAPI.SnmpSendMsg(Session,Source,Destin,Context1,Pdu1); SnmpAPI.SnmpSendMsg(Session,Source,Destin,Context2,Pdu2); SnmpAPI.SnmpSendMsg(Session,Source,Destin,Context3,Pdu3); // now free the contexts Result = SnmpAPI.SnmpFreeContext(Context1); Result = SnmpAPI.SnmpFreeContext(Context2); Result = SnmpAPI.SnmpFreeContext(Context3); // now free the pdus Result = SnmpAPI.SnmpFreePdu(Pdu1); Result = SnmpAPI.SnmpFreePdu(Pdu2); Result = SnmpAPI.SnmpFreePdu(Pdu3); // now free the variable lists SnmpAPI.SnmpFreeVbl(VbL1); SnmpAPI.SnmpFreeVbl(VbL2); SnmpAPI.SnmpFreeVbl(VbL3); // now free the entities SnmpAPI.SnmpFreeEntity(Code1); SnmpAPI.SnmpFreeEntity(Code2); SnmpAPI.SnmpFreeEntity(Code3); // now free the oids SnmpAPI.SnmpFreeDescriptor((int)WinSnmp.SNMPAPI_SYNTAX.SNMP_SYNTAX_OID,ref OID1); SnmpAPI.SnmpFreeDescriptor((int)WinSnmp.SNMPAPI_SYNTAX.SNMP_SYNTAX_OID,ref OID2); SnmpAPI.SnmpFreeDescriptor((int)WinSnmp.SNMPAPI_SYNTAX.SNMP_SYNTAX_OID,ref OID3); // call snmpClose Result = SnmpAPI.SnmpClose(Session); // finally call SnmpCleanup Result = SnmpAPI.SnmpCleanup(); } so the octets item is an IntPtr...but all I got is a byte array. Any help would be greatly appreciated. Chi They mostly come at night...mostly

i figured it out. i now have a sweet snmp interop. thanks to everyone that responded...oh yeah NO ONE DID! lol Chi They mostly come at night...mostly

willing to share your solution? (I have same problem).

This seems to work. Marshal the string and set pointer to implicity acquired unmanaged memory. CommString is a 'regular' c# string object...lastly free unmanaged storage after snmp calls --> SMIOCTETS oct = new SMIOCTETS(); oct.size = (uint) CommString.Length; oct.octets = Marshal.StringToHGlobalAnsi(CommString); ctxt = SnmpAPI.SnmpStrToContext(SessHndl, ref oct); // ctxt==context pointer ...do work... Marshal.FreeHGlobal(oct.octets);

hi I am stuck in the same position. Could you plz... help thanks rohit rangroo

http://www.evolutionsoftwarellc.com/downloads/mmalo_snmp.rar email me for the password. Chi They mostly come at night...mostly