/*	Version
	v1.00	28.10.02
*/

#include <stdio.h>
#include "winsnmp.h"
#include <string>

#define MAX_STRING 255

class oid  
{
public:
	char* get(){return str;}
	oid(char*s){strcpy(str,s);}
	char *getstring()const{return (char*)str;}
	virtual ~oid(){};

private:
	char str[MAX_STRING];
};

class CsnmpBncs
{
public:
	CsnmpBncs(void);
	~CsnmpBncs(void);

	int init_snmp(LPSTR szIpAdd, LPSTR szCommunity, int iRemotePort = 161,
		LPSTR szLocalIpAddr = "127.0.0.1", int iLocalPort = 0);
	int close_snmp(void);

	int SendSnmpMessage(int iOperation, char szOID[], LPSTR szData, int iDataType, UINT uMssgeNum);

	int GetRetransMode();
	int setRetransMode(int iMode);
	int getTimeout();
	int setTimeout(int iTime);
	int setRetry(int iRetry);
	int getRetry();

	int GetValue(HSNMP_VBL vbl, int iEntry, int iSize, LPSTR lpString);
	int GetOid(HSNMP_VBL vbl, int iEntry, int iSize, LPSTR lpString);
	int CmpOid(HSNMP_VBL vbl, int iEntry, LPSTR lpString, LPINT result);
	int CmpValueOid(HSNMP_VBL vbl, int iEntry, LPSTR lpString, LPINT result);

	//********** do not use externally *********
	SNMPAPI_STATUS CALLBACK instance_callback(HSNMP_SESSION ,HWND , UINT ,WPARAM ,LPARAM);

private:
	virtual HSNMP_VBL SNMPTrap(CsnmpBncs*, HSNMP_PDU hPDU);		//used to forward trap messages
	virtual HSNMP_VBL SNMPReply(CsnmpBncs*, HSNMP_PDU hPDU);	//used to reply to messages
	virtual void SNMPError(CsnmpBncs*, UINT iError, UINT iIndex);//used to indicate message erorr number

	static SNMPAPI_STATUS CALLBACK snmp_callback(HSNMP_SESSION ,HWND , UINT ,WPARAM ,LPARAM ,LPVOID );
	void debug(LPCSTR szFmt, ...);

	HSNMP_SESSION		hSnmpSession;		//Handle to the SNMP session
	HSNMP_VBL			hVbl;				//Handle to Variable binding list
	HSNMP_PDU			hPdu;				//Handle to SNMP protocol data unit (PDU). 
	HSNMP_ENTITY		hSrc;				//Handle to SNMP source
	HSNMP_ENTITY		hDest;				//Handle to SNMP destination
	HSNMP_CONTEXT		hCtx;				//Handle to SNMP context
	smiOCTETS			dCtx;				//Structure holding community name
	static UINT			uInstance;			//Number of instances of class
};