Read/write callback function signatures

Function typedefs your callbacks must match. The shape of the callback selects the dispatcher overload automatically. More...

Scalar read-callback signatures
A scalar read callback takes no arguments and returns the current value of the variable. Pick the signature whose return type matches the ASN_type* tag passed to SNMPREADFUNC — the correct internal dispatcher is chosen by the SNMPReadObject constructor overload that matches your callback's type.
typedef int *	GetpIFunc()
	Returns pointer-to-int (OID values).
typedef const char *	GetCCFunc()
	Returns a C string.
typedef void	GetOTFunc(uint8_t *&pData, int &len)
	Returns a raw octet buffer and its length.
typedef int	GetIFunc()
	Returns signed int.
typedef unsigned int	GetuIFunc()
	Returns unsigned int.
typedef unsigned long	GetulFunc()
	Returns unsigned long.
typedef unsigned long long	GetullFunc()
	Returns unsigned long long.
typedef MACADR	GetMadrFunc()
	Returns a MAC address.

Scalar write-callback signatures
A scalar write callback receives the incoming value plus a bTest flag. When bTest != 0 the callback should validate the value without committing; when bTest == 0 it should apply the value. Return SNMP_SET_OK if the value is acceptable / was applied, or SNMP_SET_FAIL otherwise.
typedef int	PutpIFunc(int *, int)
	Writes pointer-to-int.
typedef int	PutCCFunc(const char *, int)
	Writes a C string.
typedef int	PutOTFunc(const unsigned char *, int, int)
	Writes an octet string (buffer, length, bTest).
typedef int	PutIFunc(int, int)
	Writes signed int.
typedef int	PutuIFunc(unsigned int, int)
	Writes unsigned int.
typedef int	PutulFunc(unsigned long, int)
	Writes unsigned long.
typedef int	PutullFunc(unsigned long long, int)
	Writes unsigned long long.
typedef int	PutMadrFunc(MACADR, int)
	Writes a MAC address.

Table write-callback signatures
Identical to the scalar write signatures but with an extra void * user context pointer so one callback can service many table rows. Used with AddSnmpWriteEntry.
typedef int	PutpIFuncTab(int *, int, void *)
	Table variant of PutpIFunc.
typedef int	PutCCFuncTab(const char *, int, void *)
	Table variant of PutCCFunc.
typedef int	PutOTFuncTab(const unsigned char *, int, int, void *)
	Table variant of PutOTFunc.
typedef int	PutIFuncTab(int, int, void *)
	Table variant of PutIFunc.
typedef int	PutuIFuncTab(unsigned int, int, void *)
	Table variant of PutuIFunc.
typedef int	PutulFuncTab(unsigned long, int, void *)
	Table variant of PutulFunc.
typedef int	PutullFuncTab(unsigned long long, int, void *)
	Table variant of PutullFunc.
typedef int	PutMadrFuncTab(MACADR, int, void *)
	Table variant of PutMadrFunc.

Detailed Description

Function typedefs your callbacks must match. The shape of the callback selects the dispatcher overload automatically.